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Date: Wed, 2 Dec 2020 13:47:13 +0000
From: "Leif Lindholm" <leif@nuviainc.com>
To: Abner Chang <abner.chang@hpe.com>
Cc: devel@edk2.groups.io, Andrew Fish <afish@apple.com>,
	Laszlo Ersek <lersek@redhat.com>,
	Michael D Kinney <michael.d.kinney@intel.com>,
	Nickle Wang <nickle.wang@hpe.com>,
	Peter O'Hanley <peter.ohanley@hpe.com>
Subject: Re: [PATCH v3 2/4] RedfishPkg/library: EDK2 port of jansson library
Message-ID: <20201202134713.GI1664@vanye>
References: <20201202071557.4688-1-abner.chang@hpe.com>
 <20201202071557.4688-3-abner.chang@hpe.com>
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On Wed, Dec 02, 2020 at 15:15:55 +0800, Abner Chang wrote:
> edk2 JsonLib which is the edk2 port of open source
> jansson library.
> (https://github.com/akheron/jansson)

Please describe what is in this patch.

> Signed-off-by: Abner Chang <abner.chang@hpe.com>
> 
> Cc: Andrew Fish <afish@apple.com>
> Cc: Laszlo Ersek <lersek@redhat.com>
> Cc: Leif Lindholm <leif@nuviainc.com>
> Cc: Michael D Kinney <michael.d.kinney@intel.com>
> Cc: Nickle Wang <nickle.wang@hpe.com>
> Cc: Peter O'Hanley <peter.ohanley@hpe.com>
> ---
>  .../Include/Library/JanssonJsonLibMapping.h   |   63 +
>  RedfishPkg/Include/Library/JsonLib.h          |  767 ++++++++++++
>  .../Library/JsonLib/JanssonCrtLibSupport.c    |  705 +++++++++++
>  .../Library/JsonLib/JanssonCrtLibSupport.h    |  196 +++
>  RedfishPkg/Library/JsonLib/JsonLib.c          |  960 ++++++++++++++
>  RedfishPkg/Library/JsonLib/JsonLib.inf        |  103 ++
>  RedfishPkg/Library/JsonLib/JsonUtilities.c    |  417 +++++++
>  RedfishPkg/Library/JsonLib/JsonUtilities.h    |   69 +
>  RedfishPkg/Library/JsonLib/Readme.txt         |   40 +
>  RedfishPkg/Library/JsonLib/assert.h           |   16 +
>  RedfishPkg/Library/JsonLib/errno.h            |   16 +
>  RedfishPkg/Library/JsonLib/jansson_config.h   |   60 +
>  .../Library/JsonLib/jansson_private_config.h  |   19 +
>  RedfishPkg/Library/JsonLib/limits.h           |   16 +
>  RedfishPkg/Library/JsonLib/load.c             | 1111 +++++++++++++++++
>  RedfishPkg/Library/JsonLib/math.h             |   16 +
>  RedfishPkg/Library/JsonLib/stdarg.h           |   15 +
>  RedfishPkg/Library/JsonLib/stddef.h           |   16 +
>  RedfishPkg/Library/JsonLib/stdio.h            |   15 +
>  RedfishPkg/Library/JsonLib/stdlib.h           |   16 +
>  RedfishPkg/Library/JsonLib/string.h           |   16 +
>  RedfishPkg/Library/JsonLib/sys/time.h         |   15 +
>  RedfishPkg/Library/JsonLib/sys/types.h        |   15 +
>  RedfishPkg/Library/JsonLib/time.h             |   15 +
>  RedfishPkg/RedfishPkg.ci.yaml                 |   33 +-
>  25 files changed, 4729 insertions(+), 1 deletion(-)
>  create mode 100644 RedfishPkg/Include/Library/JanssonJsonLibMapping.h
>  create mode 100644 RedfishPkg/Include/Library/JsonLib.h
>  create mode 100644 RedfishPkg/Library/JsonLib/JanssonCrtLibSupport.c
>  create mode 100644 RedfishPkg/Library/JsonLib/JanssonCrtLibSupport.h
>  create mode 100644 RedfishPkg/Library/JsonLib/JsonLib.c
>  create mode 100644 RedfishPkg/Library/JsonLib/JsonLib.inf
>  create mode 100644 RedfishPkg/Library/JsonLib/JsonUtilities.c
>  create mode 100644 RedfishPkg/Library/JsonLib/JsonUtilities.h
>  create mode 100644 RedfishPkg/Library/JsonLib/Readme.txt
>  create mode 100644 RedfishPkg/Library/JsonLib/assert.h
>  create mode 100644 RedfishPkg/Library/JsonLib/errno.h
>  create mode 100644 RedfishPkg/Library/JsonLib/jansson_config.h
>  create mode 100644 RedfishPkg/Library/JsonLib/jansson_private_config.h
>  create mode 100644 RedfishPkg/Library/JsonLib/limits.h
>  create mode 100644 RedfishPkg/Library/JsonLib/load.c
>  create mode 100644 RedfishPkg/Library/JsonLib/math.h
>  create mode 100644 RedfishPkg/Library/JsonLib/stdarg.h
>  create mode 100644 RedfishPkg/Library/JsonLib/stddef.h
>  create mode 100644 RedfishPkg/Library/JsonLib/stdio.h
>  create mode 100644 RedfishPkg/Library/JsonLib/stdlib.h
>  create mode 100644 RedfishPkg/Library/JsonLib/string.h
>  create mode 100644 RedfishPkg/Library/JsonLib/sys/time.h
>  create mode 100644 RedfishPkg/Library/JsonLib/sys/types.h
>  create mode 100644 RedfishPkg/Library/JsonLib/time.h
> 
> diff --git a/RedfishPkg/Include/Library/JanssonJsonLibMapping.h b/RedfishPkg/Include/Library/JanssonJsonLibMapping.h
> new file mode 100644
> index 0000000000..80452d6663
> --- /dev/null
> +++ b/RedfishPkg/Include/Library/JanssonJsonLibMapping.h
> @@ -0,0 +1,63 @@
> +/** @file
> +  This is the wrapper to map funcitons and definitions used in
> +  native jannson applications to edk2 JsonLib. This avoids the
> +  modifications on native jannson applications to be built under
> +  edk2 environment.
> +
> + (C) Copyright 2020 Hewlett Packard Enterprise Development LP<BR>
> +
> +    SPDX-License-Identifier: BSD-2-Clause-Patent
> +
> +**/
> +
> +#ifndef LIBREDFISH_JSON_SUPPORT_H_
> +#define LIBREDFISH_JSON_SUPPORT_H_
> +
> +#include <Library/JsonLib.h>
> +
> +typedef EDKII_JSON_VALUE   json_t;
> +typedef EDKII_JSON_INT_T   json_int_t;
> +typedef EDKII_JSON_TYPE    json_type;
> +
> +///
> +/// JSON type mapping
> +///
> +#define JSON_OBJECT    EdkiiJsonTypeObject
> +#define JSON_ARRAY     EdkiiJsonTypeArray
> +#define JSON_STRING    EdkiiJsonTypeString
> +#define JSON_INTEGER   EdkiiJsonTypeInteger
> +#define JSON_REAL      EdkiiJsonTypeReal
> +#define JSON_TRUE      EdkiiJsonTypeTrue
> +#define JSON_FALSE     EdkiiJsonTypeFalse
> +#define JSON_NULL      EdkiiJsonTypeNull
> +
> +#define JSON_INDENT(n) EDKII_JSON_INDENT(n)
> +
> +///
> +/// JSON function mapping
> +///
> +#define json_object_get(JsonObj,key)             JsonObjectGetValue(JsonObj,key)
> +#define json_is_object(JsonValue)                JsonValueIsObject(JsonValue)
> +#define json_is_array(JsonValue)                 JsonValueIsArray(JsonValue)
> +#define json_is_string(JsonValue)                JsonValueIsString(JsonValue)
> +#define json_integer(JsonValue)                  JsonValueInitNumber(JsonValue)
> +#define json_object_set(JsonObj,Key,JsonValue)   JsonObjectSetValue(JsonObj,Key,JsonValue)
> +#define json_object()                            JsonValueInitObject()
> +#define json_object_size(JsonObject)             JsonObjectSize(JsonObject)
> +#define json_array_get(JsonArray,Index)          JsonArrayGetValue(JsonArray,Index)
> +#define json_array_append(JsonArray,JsonValue)   JsonArrayAppendValue(JsonArray,JsonValue)
> +#define json_dumps(JsonValue,Flags)              JsonDumpString(JsonValue,Flags)
> +#define json_string_value(JsonValue)             JsonValueGetString(JsonValue)
> +#define json_array_size(JsonArray)               JsonArrayCount(JsonArray)
> +#define json_array()                             JsonValueInitArray()
> +#define json_loadb(Buffer,BufferLen,Flags,Error) JsonLoadBuffer(Buffer,BufferLen,Flags,Error)
> +#define json_decref(JsonValue)                   JsonDecreaseReference(JsonValue)
> +#define json_incref(JsonValue)                   JsonIncreaseReference(JsonValue)
> +#define json_string(AsciiString)                 JsonValueInitAsciiString(AsciiString)
> +#define json_object_iter(JsonValue)              JsonObjectIterator(JsonValue)
> +#define json_object_iter_value(Iterator)         JsonObjectIteratorValue(Iterator)
> +#define json_object_iter_next(JsonValue,Iterator) JsonObjectIteratorNext(JsonValue,Iterator)
> +#define json_integer_value(JsonValue)            JsonValueGetNumber(JsonValue)
> +#define json_get_type(JsonValue)                 JsonGetType(JsonValue)

I'm not going to force you to do the work here, but I am going to
state an opinion:
When we bring in external code, using a differing coding style, it is
very helpful to do what we *didn't* do with libfdt and provide a
coding-style compatible way of accessing it. You do that here, and
that is excellent, but...

Only doing itn through macros means we're following the superficial
form without following the underlying design ideals.
In a perfect world, when we import an external module, I would like to
see it wrapped as a protocol, discoverable for anyone to use.

> +
> +#endif
> diff --git a/RedfishPkg/Include/Library/JsonLib.h b/RedfishPkg/Include/Library/JsonLib.h
> new file mode 100644
> index 0000000000..adadcbf33f
> --- /dev/null
> +++ b/RedfishPkg/Include/Library/JsonLib.h
> @@ -0,0 +1,767 @@
> +/** @file
> +  APIs for JSON operations.
> +
> +  Copyright (c) 2019, Intel Corporation. All rights reserved.<BR>
> + (C) Copyright 2020 Hewlett Packard Enterprise Development LP<BR>
> +
> +    SPDX-License-Identifier: BSD-2-Clause-Patent
> +
> +**/
> +#ifndef JSON_LIB_H_
> +#define JSON_LIB_H_
> +
> +#include <Uefi.h>
> +
> +#include <Library/BaseMemoryLib.h>
> +#include <Library/MemoryAllocationLib.h>
> +
> +typedef    VOID*    EDKII_JSON_VALUE;
> +typedef    VOID*    EDKII_JSON_ARRAY;
> +typedef    VOID*    EDKII_JSON_OBJECT;
> +
> +///
> +/// Map to json_int_t in jansson.h
> +///
> +typedef long long   EDKII_JSON_INT_T;  // #JSON_INTEGER_IS_LONG_LONG is set to 1
> +                                       // in jansson_Config.h

Is this the right thing to do, or should this be explicitly UINT64?

> +
> +///
> +///  Map to the definitions in jansson.h
> +///
> +#define EDKII_JSON_MAX_INDENT        0x1f
> +#define EDKII_JSON_INDENT(n)         ((n)&EDKII_JSON_MAX_INDENT)

Spaces around & please.

> +#define EDKII_JSON_COMPACT           0x20
> +#define EDKII_JSON_ENSURE_ASCII      0x40
> +#define EDKII_JSON_SORT_KEYS         0x80
> +#define EDKII_JSON_PRESERVE_ORDER    0x100
> +#define EDKII_JSON_ENCODE_ANY        0x200
> +#define EDKII_JSON_ESCAPE_SLASH      0x400
> +#define EDKII_JSON_REAL_PRECISION(n) (((n)&0x1F) << 11)

Is this the same 0x1f as above?
Spaces around & please.

> +#define EDKII_JSON_EMBED             0x10000
> +
> +#define EDKII_JSON_ARRAY_FOREACH(Array, Index, Value) \
> +  for(Index = 0; \
> +    Index < JsonArrayCount(Array) && (Value = JsonArrayGetValue(Array, Index)); \
> +    Index++)
> +
> +///
> +///  Map to the json_error_t in jansson.h
> +///
> +#define EDKII_JSON_ERROR_TEXT_LENGTH   160
> +#define EDKII_JSON_ERROR_SOURCE_LENGTH 80
> +typedef struct {
> +    INTN    Line;
> +    INTN    Column;
> +    INTN    Position;
> +    CHAR8   Source [EDKII_JSON_ERROR_SOURCE_LENGTH];
> +    CHAR8   Text [EDKII_JSON_ERROR_TEXT_LENGTH];
> +} EDKII_JSON_ERROR;
> +
> +///
> +///  Map to the json_type in jansson.h
> +///
> +typedef enum {
> +    EdkiiJsonTypeObject,
> +    EdkiiJsonTypeArray,
> +    EdkiiJsonTypeString,
> +    EdkiiJsonTypeInteger,
> +    EdkiiJsonTypeReal,
> +    EdkiiJsonTypeTrue,
> +    EdkiiJsonTypeFalse,
> +    EdkiiJsonTypeNull
> +} EDKII_JSON_TYPE;
> +
> +/**
> +  The function is used to convert a NULL terminated UTF8 encoded string to a JSON
> +  value. Only object and array represented strings can be converted successfully,
> +  since they are the only valid root values of a JSON text for UEFI usage.
> +
> +  Real number and number with exponent part are not supportted by UEFI.
> +
> +  Caller needs to cleanup the root value by calling JsonValueFree().
> +
> +  @param[in]   Text             The NULL terminated UTF8 encoded string to convert
> +
> +  @retval      Array JSON value or object JSON value, or NULL when any error occurs.
> +
> +**/
> +EDKII_JSON_VALUE
> +EFIAPI
> +TextToJson (
> +  IN    CHAR8*    Text
> +  );
> +
> +/**
> +  The function is used to convert the JSON root value to a UTF8 encoded string which
> +  is terminated by NULL, or return NULL on error.
> +
> +  Only array JSON value or object JSON value is valid for converting, and caller is
> +  responsible for free converted string.
> +
> +  @param[in]   Json               The JSON value to be converted
> +
> +  @retval      The JSON value converted UTF8 string or NULL.
> +
> +**/
> +CHAR8*
> +EFIAPI
> +JsonToText (
> +  IN    EDKII_JSON_VALUE    Json
> +  );
> +
> +/**
> +  The function is used to initialize a JSON value which contains a new JSON array,
> +  or NULL on error. Initially, the array is empty.
> +
> +  The reference count of this value will be set to 1, and caller needs to cleanup the
> +  value by calling JsonValueFree().
> +
> +  More details for reference count strategy can refer to the API description for JsonValueFree().
> +
> +  @retval      The created JSON value which contains a JSON array or NULL.
> +
> +**/
> +EDKII_JSON_VALUE
> +EFIAPI
> +JsonValueInitArray (
> +  VOID
> +  );
> +
> +/**
> +  The function is used to initialize a JSON value which contains a new JSON object,
> +  or NULL on error. Initially, the object is empty.
> +
> +  The reference count of this value will be set to 1, and caller needs to cleanup the
> +  value by calling JsonValueFree().
> +
> +  More details for reference count strategy can refer to the API description for JsonValueFree().
> +
> +  @retval      The created JSON value which contains a JSON object or NULL.
> +
> +**/
> +EDKII_JSON_VALUE
> +EFIAPI
> +JsonValueInitObject (
> +  VOID
> +  );
> +
> +/**
> +  The function is used to initialize a JSON value which contains a new JSON string,
> +  or NULL on error.
> +
> +  The input string must be NULL terminated Ascii format, non-Ascii characters will
> +  be processed as an error. Unicode characters can also be represented by Ascii string
> +  as the format: \u + 4 hexadecimal digits, like \u3E5A, or \u003F.
> +
> +  The reference count of this value will be set to 1, and caller needs to cleanup the
> +  value by calling JsonValueFree().
> +
> +  More details for reference count strategy can refer to the API description for JsonValueFree().
> +
> +  @param[in]   String      The Ascii string to initialize to JSON value
> +
> +  @retval      The created JSON value which contains a JSON string or NULL. Select a
> +               Getter API for a specific encoding format.
> +
> +**/
> +EDKII_JSON_VALUE
> +EFIAPI
> +JsonValueInitAsciiString (
> +  IN    CONST CHAR8    *String
> +  );
> +
> +/**
> +  The function is used to initialize a JSON value which contains a new JSON string,
> +  or NULL on error.
> +
> +  The input must be a NULL terminated UCS2 format Unicode string.
> +
> +  The reference count of this value will be set to 1, and caller needs to cleanup the
> +  value by calling JsonValueFree().
> +
> +  More details for reference count strategy can refer to the API description for JsonValueFree().
> +
> +  @param[in]   String      The Unicode string to initialize to JSON value
> +
> +  @retval      The created JSON value which contains a JSON string or NULL. Select a
> +               Getter API for a specific encoding format.
> +
> +**/
> +EDKII_JSON_VALUE
> +EFIAPI
> +JsonValueInitUnicodeString (
> +  IN    CHAR16    *String
> +  );
> +
> +/**
> +  The function is used to initialize a JSON value which contains a new JSON integer,
> +  or NULL on error.
> +
> +  The reference count of this value will be set to 1, and caller needs to cleanup the
> +  value by calling JsonValueFree().
> +
> +  More details for reference count strategy can refer to the API description for JsonValueFree().
> +
> +  @param[in]   Value       The integer to initialize to JSON value
> +
> +  @retval      The created JSON value which contains a JSON number or NULL.
> +
> +**/
> +EDKII_JSON_VALUE
> +EFIAPI
> +JsonValueInitNumber (
> +  IN    INT64    Value
> +  );
> +
> +/**
> +  The function is used to initialize a JSON value which contains a new JSON boolean,
> +  or NULL on error.
> +
> +  Boolean JSON value is kept as static value, and no need to do any cleanup work.
> +
> +  @param[in]   Value       The boolean value to initialize.
> +
> +  @retval      The created JSON value which contains a JSON boolean or NULL.
> +
> +**/
> +EDKII_JSON_VALUE
> +EFIAPI
> +JsonValueInitBoolean (
> +  IN    BOOLEAN    Value
> +  );
> +
> +/**
> +  The function is used to initialize a JSON value which contains a new JSON NULL,
> +  or NULL on error.
> +
> +  NULL JSON value is kept as static value, and no need to do any cleanup work.
> +
> +  @retval      The created NULL JSON value.
> +
> +**/
> +EDKII_JSON_VALUE
> +EFIAPI
> +JsonValueInitNull (
> +  VOID
> +  );
> +
> +/**
> +  The function is used to decrease the reference count of a JSON value by one, and once
> +  this reference count drops to zero, the value is destroyed and it can no longer be used.
> +  If this destroyed value is object type or array type, reference counts for all containing
> +  JSON values will be decreased by 1. Boolean JSON value and NULL JSON value won't be destroyed
> +  since they are static values kept in memory.
> +
> +  Reference Count Strategy: BaseJsonLib uses this strategy to track whether a value is still
> +  in use or not. When a value is created, it's reference count is set to 1. If a reference to a
> +  value is kept for use, its reference count is incremented, and when the value is no longer
> +  needed, the reference count is decremented. When the reference count drops to zero, there are
> +  no references left, and the value can be destroyed.
> +
> +  The given JSON value maybe NULL and not causing any problem. Just output the debug message
> +  to inform caller the NULL value is passed in.
> +
> +  @param[in]   Json             The JSON value to be freed. json_decref may return without any
> +                                changes if Json is NULL.
> +
> +**/
> +VOID
> +EFIAPI
> +JsonValueFree (
> +  IN    EDKII_JSON_VALUE    Json
> +  );
> +
> +/**
> +  The function is used to create a fresh copy of a JSON value, and all child values are deep
> +  copied in a recursive fashion. It should be called when this JSON value might be modified
> +  in later use, but the original still wants to be used in somewhere else.
> +
> +  Reference counts of the returned root JSON value and all child values will be set to 1, and
> +  caller needs to cleanup the root value by calling JsonValueFree().
> +
> +  * Note: Since this function performs a copy from bottom to up, too many calls may cause some
> +  performance issues, user should avoid unnecessary calls to this function unless it is really
> +  needed.
> +
> +  @param[in]   Json             The JSON value to be cloned.
> +
> +  @retval      Return the cloned JSON value, or NULL on error.
> +
> +**/
> +EDKII_JSON_VALUE
> +EFIAPI
> +JsonValueClone (
> +  IN    EDKII_JSON_VALUE    Json
> +  );
> +
> +/**
> +  The function is used to return if the provided JSON value contains a JSON array.
> +
> +  @param[in]   Json             The provided JSON value.
> +
> +  @retval      TRUE             The JSON value contains a JSON array.
> +  @retval      FALSE            The JSON value doesn't contain a JSON array.
> +
> +**/
> +BOOLEAN
> +EFIAPI
> +JsonValueIsArray (
> +  IN    EDKII_JSON_VALUE    Json
> +  );
> +
> +/**
> +  The function is used to return if the provided JSON value contains a JSON object.
> +
> +  @param[in]   Json             The provided JSON value.
> +
> +  @retval      TRUE             The JSON value contains a JSON object.
> +  @retval      FALSE            The JSON value doesn't contain a JSON object.
> +
> +**/
> +BOOLEAN
> +EFIAPI
> +JsonValueIsObject (
> +  IN    EDKII_JSON_VALUE    Json
> +  );
> +
> +/**
> +  The function is used to return if the provided JSON Value contains a string, Ascii or
> +  Unicode format is not differentiated.
> +
> +  @param[in]   Json             The provided JSON value.
> +
> +  @retval      TRUE             The JSON value contains a JSON string.
> +  @retval      FALSE            The JSON value doesn't contain a JSON string.
> +
> +**/
> +BOOLEAN
> +EFIAPI
> +JsonValueIsString (
> +  IN    EDKII_JSON_VALUE    Json
> +  );
> +
> +/**
> +  The function is used to return if the provided JSON value contains a JSON number.
> +
> +  @param[in]   Json             The provided JSON value.
> +
> +  @retval      TRUE             The JSON value is contains JSON number.
> +  @retval      FALSE            The JSON value doesn't contain a JSON number.
> +
> +**/
> +BOOLEAN
> +EFIAPI
> +JsonValueIsNumber (
> +  IN    EDKII_JSON_VALUE    Json
> +  );
> +
> +/**
> +  The function is used to return if the provided JSON value contains a JSON boolean.
> +
> +  @param[in]   Json             The provided JSON value.
> +
> +  @retval      TRUE             The JSON value contains a JSON boolean.
> +  @retval      FALSE            The JSON value doesn't contain a JSON boolean.
> +
> +**/
> +BOOLEAN
> +EFIAPI
> +JsonValueIsBoolean (
> +  IN    EDKII_JSON_VALUE    Json
> +  );
> +
> +/**
> +  The function is used to return if the provided JSON value contains a JSON NULL.
> +
> +  @param[in]   Json             The provided JSON value.
> +
> +  @retval      TRUE             The JSON value contains a JSON NULL.
> +  @retval      FALSE            The JSON value doesn't contain a JSON NULL.
> +
> +**/
> +BOOLEAN
> +EFIAPI
> +JsonValueIsNull (
> +  IN    EDKII_JSON_VALUE    Json
> +  );
> +
> +/**
> +  The function is used to retrieve the associated array in an array type JSON value.
> +
> +  Any changes to the returned array will impact the original JSON value.
> +
> +  @param[in]   Json             The provided JSON value.
> +
> +  @retval      Return the associated array in JSON value or NULL.
> +
> +**/
> +EDKII_JSON_ARRAY
> +EFIAPI
> +JsonValueGetArray (
> +  IN    EDKII_JSON_VALUE    Json
> +  );
> +
> +/**
> +  The function is used to retrieve the associated object in an object type JSON value.
> +
> +  Any changes to the returned object will impact the original JSON value.
> +
> +  @param[in]   Json             The provided JSON value.
> +
> +  @retval      Return the associated object in JSON value or NULL.
> +
> +**/
> +EDKII_JSON_OBJECT
> +EFIAPI
> +JsonValueGetObject (
> +  IN    EDKII_JSON_VALUE    Json
> +  );
> +
> +/**
> +  The function is used to retrieve the associated Ascii string in a string type JSON value.
> +
> +  Any changes to the returned string will impact the original JSON value.
> +
> +  @param[in]   Json             The provided JSON value.
> +
> +  @retval      Return the associated Ascii string in JSON value or NULL.
> +
> +**/
> +CHAR8*
> +EFIAPI
> +JsonValueGetAsciiString (
> +  IN    EDKII_JSON_VALUE    Json
> +  );
> +
> +/**
> +  The function is used to retrieve the associated Unicode string in a string type JSON value.
> +
> +  Caller can do any changes to the returned string without any impact to the original JSON
> +  value, and caller needs to free the returned string.
> +
> +  @param[in]   Json             The provided JSON value.
> +
> +  @retval      Return the associated Unicode string in JSON value or NULL.
> +
> +**/
> +CHAR16*
> +EFIAPI
> +JsonValueGetUnicodeString (
> +  IN    EDKII_JSON_VALUE    Json
> +  );
> +
> +/**
> +  The function is used to retrieve the associated integer in a number type JSON value.
> +
> +  The input JSON value should not be NULL or contain no JSON number, otherwise it will
> +  ASSERT() and return 0.
> +
> +  @param[in]   Json             The provided JSON value.
> +
> +  @retval      Return the associated number in JSON value.
> +
> +**/
> +INT64
> +EFIAPI
> +JsonValueGetNumber (
> +  IN    EDKII_JSON_VALUE    Json
> +  );
> +
> +/**
> +  The function is used to retrieve the associated boolean in a boolean type JSON value.
> +
> +  The input JSON value should not be NULL or contain no JSON boolean, otherwise it will
> +  ASSERT() and return FALSE.
> +
> +  @param[in]   Json             The provided JSON value.
> +
> +  @retval      Return the associated value of JSON boolean.
> +
> +**/
> +BOOLEAN
> +EFIAPI
> +JsonValueGetBoolean (
> +  IN    EDKII_JSON_VALUE    Json
> +  );
> +
> +/**
> +  The function is used to retrieve the associated string in a string type JSON value.
> +
> +  Any changes to the returned string will impact the original JSON value.
> +
> +  @param[in]   Json             The provided JSON value.
> +
> +  @retval      Return the associated Ascii string in JSON value or NULL.
> +
> +**/
> +CONST CHAR8*
> +EFIAPI
> +JsonValueGetString (
> +  IN    EDKII_JSON_VALUE    Json
> +  );
> +
> +/**
> +  The function is used to get the number of elements in a JSON object, or 0 if it is NULL or
> +  not a JSON object.
> +
> +  @param[in]   JsonObject              The provided JSON object.
> +
> +  @retval      Return the number of elements in this JSON object or 0.
> +
> +**/
> +UINTN
> +EFIAPI
> +JsonObjectSize (
> +  IN    EDKII_JSON_OBJECT    JsonObject
> +  );
> +
> +/**
> +  The function is used to enumerate all keys in a JSON object.
> +
> +  Caller should be responsible to free the returned key array refference. But contained keys
> +  are read only and must not be modified or freed.
> +
> +  @param[in]   JsonObj                The provided JSON object for enumeration.
> +  @param[out]  KeyCount               The count of keys in this JSON object.
> +
> +  @retval      Return an array of the enumerated keys in this JSON object or NULL.
> +
> +**/
> +CHAR8**
> +JsonObjectGetKeys (
> +  IN    EDKII_JSON_OBJECT    JsonObj,
> +  OUT   UINTN                *KeyCount
> +  );
> +
> +/**
> +  The function is used to get a JSON value corresponding to the input key from a JSON object.
> +
> +  It only returns a reference to this value and any changes on this value will impact the
> +  original JSON object. If that is not expected, please call JsonValueClone() to clone it to
> +  use.
> +
> +  Input key must be a valid NULL terminated UTF8 encoded string. NULL will be returned when
> +  Key-Value is not found in this JSON object.
> +
> +  @param[in]   JsonObj           The provided JSON object.
> +  @param[in]   Key               The key of the JSON value to be retrieved.
> +
> +  @retval      Return the corresponding JSON value to key, or NULL on error.
> +
> +**/
> +EDKII_JSON_VALUE
> +EFIAPI
> +JsonObjectGetValue (
> +  IN    CONST EDKII_JSON_OBJECT    JsonObj,
> +  IN    CONST CHAR8                *Key
> +  );
> +
> +/**
> +  The function is used to set a JSON value corresponding to the input key from a JSON object,
> +  and the reference count of this value will be increased by 1.
> +
> +  Input key must be a valid NULL terminated UTF8 encoded string. If there already is a value for
> +  this key, this key will be assigned to the new JSON value. The old JSON value will be removed
> +  from this object and thus its' reference count will be decreased by 1.
> +
> +  More details for reference count strategy can refer to the API description for JsonValueFree().
> +
> +  @param[in]   JsonObj                The provided JSON object.
> +  @param[in]   Key                    The key of the JSON value to be set.
> +  @param[in]   Json                   The JSON value to set to this JSON object mapped by key.
> +
> +  @retval      EFI_ABORTED            Some error occur and operation aborted.
> +  @retval      EFI_SUCCESS            The JSON value has been set to this JSON object.
> +
> +**/
> +EFI_STATUS
> +EFIAPI
> +JsonObjectSetValue (
> +  IN    EDKII_JSON_OBJECT    JsonObj,
> +  IN    CONST CHAR8          *Key,
> +  IN    EDKII_JSON_VALUE     Json
> +  );
> +
> +/**
> +  The function is used to get the number of elements in a JSON array, or 0 if it is NULL or
> +  not a JSON array.
> +
> +  @param[in]   JsonArray              The provided JSON array.
> +
> +  @retval      Return the number of elements in this JSON array or 0.
> +
> +**/
> +UINTN
> +EFIAPI
> +JsonArrayCount (
> +  IN    EDKII_JSON_ARRAY    JsonArray
> +  );
> +
> +/**
> +  The function is used to return the JSON value in the array at position index. The valid range
> +  for this index is from 0 to the return value of JsonArrayCount() minus 1.
> +
> +  It only returns a reference to this value and any changes on this value will impact the
> +  original JSON object. If that is not expected, please call JsonValueClone() to clone it to
> +  use.
> +
> +  If this array is NULL or not a JSON array, or if index is out of range, NULL will be returned.
> +
> +  @param[in]   JsonArray         The provided JSON Array.
> +
> +  @retval      Return the JSON value located in the Index position or NULL.
> +
> +**/
> +EDKII_JSON_VALUE
> +EFIAPI
> +JsonArrayGetValue (
> +  IN    EDKII_JSON_ARRAY    JsonArray,
> +  IN    UINTN               Index
> +  );
> +
> +/**
> +  The function is used to append a JSON value to the end of the JSON array, and grow the size of
> +  array by 1. The reference count of this value will be increased by 1.
> +
> +  More details for reference count strategy can refer to the API description for JsonValueFree().
> +
> +  @param[in]   JsonArray              The provided JSON object.
> +  @param[in]   Json                   The JSON value to append.
> +
> +  @retval      EFI_ABORTED            Some error occur and operation aborted.
> +  @retval      EFI_SUCCESS            JSON value has been appended to the end of the JSON array.
> +
> +**/
> +EFI_STATUS
> +EFIAPI
> +JsonArrayAppendValue (
> +  IN    EDKII_JSON_ARRAY    JsonArray,
> +  IN    EDKII_JSON_VALUE    Json
> +  );
> +
> +/**
> +  The function is used to remove a JSON value at position index, shifting the elements after index
> +  one position towards the start of the array. The reference count of this value will be decreased
> +  by 1.
> +
> +  More details for reference count strategy can refer to the API description for JsonValueFree().
> +
> +  @param[in]   JsonArray              The provided JSON array.
> +  @param[in]   Index                  The Index position before removement.
> +
> +  @retval      EFI_ABORTED            Some error occur and operation aborted.
> +  @retval      EFI_SUCCESS            The JSON array has been removed at position index.
> +
> +**/
> +EFI_STATUS
> +EFIAPI
> +JsonArrayRemoveValue (
> +  IN    EDKII_JSON_ARRAY    JsonArray,
> +  IN    UINTN               Index
> +  );
> +
> +/**
> +  Dump JSON to a buffer
> +
> +  @param[in]   JsonValue       The provided JSON array.
> +  @param[in]   Index           The Index position before removement.
> +
> +  @retval      NULL            Dump fail if NULL returned, otherwise the buffer
> +                               contain JSON paylaod in ASCII string.
> +**/
> +CHAR8 *
> +EFIAPI
> +JsonDumpString (
> +  IN    EDKII_JSON_ARRAY    JsonValue,
> +  IN    UINTN               Flags
> +  );
> +
> +/**
> +  Load JSON from a buffer
> +
> +  @param[in]   Buffer        Bufffer to the JSON payload
> +  @param[in]   BufferLen     Length of the buffer
> +  @param[in]   Flags         Flag of loading JSON buffer
> +
> +  @retval      EDKII_JSON_VALUE  NULL means fail to load JSON payload.
> +**/
> +EDKII_JSON_VALUE
> +EFIAPI
> +JsonLoadBuffer (
> +  IN    CONST CHAR8       *Buffer,
> +  IN    UINTN             BufferLen,
> +  IN    UINTN             Flags,
> +  IN    EDKII_JSON_ERROR  *Error
> +  );
> +
> +/**
> +  Decrease reference
> +
> +  @param[in]   JsonValue      JSON value
> +**/
> +VOID
> +EFIAPI
> +JsonDecreaseReference (
> +  IN EDKII_JSON_VALUE JsonValue
> +  );
> +
> +/**
> +  Increase reference
> +
> +  @param[in]   JsonValue      JSON value
> +  @retval      EDKII_JSON_VALUE of itself
> +**/
> +EDKII_JSON_VALUE
> +EFIAPI
> +JsonIncreaseReference (
> +  IN EDKII_JSON_VALUE JsonValue
> +  );
> +/**
> +  Returns an opaque iterator which can be used to iterate over all key-value pairs
> +  in object, or NULL if object is empty
> +
> +  @param[in]   JsonValue      JSON value
> +**/
> +VOID *
> +EFIAPI
> +JsonObjectIterator (
> +  IN EDKII_JSON_VALUE JsonValue
> +  );
> +
> +/**
> +  Extract the associated value from iterator.
> +
> +  @param[in]   Iterator   Iterator pointer
> +**/
> +EDKII_JSON_VALUE
> +EFIAPI
> +JsonObjectIteratorValue (
> +  IN VOID *Iterator
> +  );
> +
> +/**
> +  Returns an iterator pointing to the next key-value pair in object after iter,
> +  or NULL if the whole object has been iterated through.
> +
> +  @param[in]   JsonValue  JSON value
> +  @param[in]   Iterator   Iterator pointer
> +  @retval      Iterator pointer
> +**/
> +VOID *
> +JsonObjectIteratorNext (
> +  IN EDKII_JSON_VALUE JsonValue,
> +  IN VOID             *Iterator
> +  );
> +
> +/**
> +  Returns the json type of this json value
> +
> +  @param[in]   JsonValue  JSON value
> +  @retval      JSON type returned
> +**/
> +EDKII_JSON_TYPE
> +EFIAPI
> +JsonGetType(
> +  IN EDKII_JSON_VALUE JsonValue
> +  );
> +#endif
> diff --git a/RedfishPkg/Library/JsonLib/JanssonCrtLibSupport.c b/RedfishPkg/Library/JsonLib/JanssonCrtLibSupport.c
> new file mode 100644
> index 0000000000..907634a05b
> --- /dev/null
> +++ b/RedfishPkg/Library/JsonLib/JanssonCrtLibSupport.c

I would howver very much prefer to see this code broken out as a
separate library (not protocol), and hence patch. It seems very much
like a minimalistic subset of https://github.com/tianocore/edk2-libc.

> @@ -0,0 +1,705 @@
> +/** @file
> +  CRT wrapper functions for Jansson system call.
> +
> +  Copyright (c) 2019, Intel Corporation. All rights reserved.<BR>
> + (C) Copyright 2020 Hewlett Packard Enterprise Development LP<BR>
> +
> +    SPDX-License-Identifier: BSD-2-Clause-Patent
> +
> +**/
> +
> +#include <JanssonCrtLibSupport.h>
> +#include <Library/MemoryAllocationLib.h>
> +#include <Library/UefiRuntimeServicesTableLib.h>
> +
> +int  errno = 0;
> +
> +/**
> +  Determine if a particular character is an alphanumeric character
> +  @return  Returns 1 if c is an alphanumeric character, otherwise returns 0.
> +**/
> +int isalnum (int c)
> +{
> +  //
> +  // <alnum> ::= [0-9] | [a-z] | [A-Z]
> +  //
> +  return ((('0' <= (c)) && ((c) <= '9')) ||
> +          (('a' <= (c)) && ((c) <= 'z')) ||
> +          (('A' <= (c)) && ((c) <= 'Z')));
> +}
> +
> +/**
> +  Determine if a particular character is a digital character
> +
> +  @return  Returns 1 if c is an digital character, otherwise returns 0.
> +**/
> +int isdchar (int c)
> +{
> +  //
> +  // [0-9] | [e +-.]
> +  //
> +  return ((('0' <= (c)) && ((c) <= '9')) ||
> +          (c == 'e') || (c == 'E') ||
> +          (c == '+') || (c == '-') ||
> +          (c == '.'));
> +}
> +
> +/**
> +  Determine if a particular character is a space character
> +
> +  @return  Returns 1 if c is a space character
> +**/
> +int isspace (int c)
> +{
> +  //
> +  // <space> ::= [ ]
> +  //
> +  return ((c) == ' ') || ((c) == '\t') || ((c) == '\r') || ((c) == '\n') || ((c) == '\v')  || ((c) == '\f');
> +}
> +
> +/**
> +  Allocates memory blocks
> +*/
> +void *malloc (size_t size)
> +{
> +  return AllocatePool ((UINTN) size);
> +}
> +
> +/**
> +  De-allocates or frees a memory block
> +*/
> +void free (void *ptr)
> +{
> +  //
> +  // In Standard C, free() handles a null pointer argument transparently. This
> +  // is not true of FreePool() below, so protect it.
> +  //
> +  if (ptr != NULL) {
> +    FreePool (ptr);
> +  }
> +}
> +
> +/**
> +  NetBSD Compatibility Function strdup creates a duplicate copy of a string.
> +
> +  @return  Returns the pointer to duplicated string.
> +**/
> +char * strdup(const char *str)
> +{
> +  size_t len;
> +  char *copy;
> +
> +  len = strlen(str) + 1;
> +  if ((copy = malloc(len)) == NULL)
> +    return (NULL);
> +  memcpy(copy, str, len);
> +  return (copy);
> +}
> +
> +/** The toupper function converts a lowercase letter to a corresponding
> +    uppercase letter.
> +
> +    @param[in]    c   The character to be converted.
> +
> +    @return   If the argument is a character for which islower is true and
> +              there are one or more corresponding characters, as specified by
> +              the current locale, for which isupper is true, the toupper
> +              function returns one of the corresponding characters (always the
> +              same one for any given locale); otherwise, the argument is
> +              returned unchanged.
> +**/
> +int
> +toupper(
> +  IN  int c
> +  )
> +{
> +  if ( (c >= 'a') && (c <= 'z') ) {
> +    c = c - ('a' - 'A');
> +  }
> +  return c;
> +}
> +
> +/**
> +  Digit to a value.
> +
> +  @return  Returns the value of digit.
> +**/
> +int
> +Digit2Val( int c)
> +{
> +  if (((c >= 'a') && (c <= 'z')) || ((c >= 'A') && (c <= 'Z'))) {  /* If c is one of [A-Za-z]... */
> +    c = toupper(c) - 7;   // Adjust so 'A' is ('9' + 1)
> +  }
> +  return c - '0';   // Value returned is between 0 and 35, inclusive.
> +}
> +
> +
> +/** The strtoll function converts the initial portion of the string pointed to
> +    by nptr to long long int representation.
> +
> +    See the description for strtol for more information.
> +
> +  @return   The strtoll function returns the converted value, if any. If no
> +            conversion could be performed, zero is returned. If the correct
> +            value is outside the range of representable values, LLONG_MIN or
> +            LLONG_MAX is returned (according to the sign of the value, if any),
> +            and the value of the macro ERANGE is stored in errno.
> +**/
> +long long
> +strtoll(const char * nptr, char ** endptr, int base)
> +{
> +  const char *pEnd;
> +  long long   Result = 0;
> +  long long   Previous;
> +  int         temp;
> +  BOOLEAN     Negative = FALSE;
> +
> +  pEnd = nptr;
> +
> +  if((base < 0) || (base == 1) || (base > 36)) {
> +    if(endptr != NULL) {
> +    *endptr = NULL;
> +    }
> +    return 0;
> +  }
> +  // Skip leading spaces.
> +  while(isspace(*nptr))   ++nptr;
> +
> +  // Process Subject sequence: optional sign followed by digits.
> +  if(*nptr == '+') {
> +    Negative = FALSE;
> +    ++nptr;
> +  }
> +  else if(*nptr == '-') {
> +    Negative = TRUE;
> +    ++nptr;
> +  }
> +
> +  if(*nptr == '0') {  /* Might be Octal or Hex */
> +    if(toupper(nptr[1]) == 'X') {   /* Looks like Hex */
> +      if((base == 0) || (base == 16)) {
> +        nptr += 2;  /* Skip the "0X"      */
> +        base = 16;  /* In case base was 0 */
> +      }
> +    }
> +    else {    /* Looks like Octal */
> +      if((base == 0) || (base == 8)) {
> +        ++nptr;     /* Skip the leading "0" */
> +        base = 8;   /* In case base was 0   */
> +      }
> +    }
> +  }
> +  if(base == 0) {   /* If still zero then must be decimal */
> +    base = 10;
> +  }
> +  if(*nptr  == '0') {
> +    for( ; *nptr == '0'; ++nptr);  /* Skip any remaining leading zeros */
> +    pEnd = nptr;
> +  }
> +
> +  while( isalnum(*nptr) && ((temp = Digit2Val(*nptr)) < base)) {
> +    Previous = Result;
> +    Result = MultS64x64 (Result, base) + (long long int)temp;
> +    if( Result <= Previous) {   // Detect Overflow
> +      if(Negative) {
> +        Result = LLONG_MIN;
> +      }
> +      else {
> +        Result = LLONG_MAX;
> +      }
> +      Negative = FALSE;
> +      errno = ERANGE;
> +      break;
> +    }
> +    pEnd = ++nptr;
> +  }
> +  if(Negative) {
> +    Result = -Result;
> +  }
> +
> +  // Save pointer to final sequence
> +  if(endptr != NULL) {
> +    *endptr = (char *)pEnd;
> +  }
> +  return Result;
> +}
> +
> +/** The strtol, strtoll, strtoul, and strtoull functions convert the initial
> +    portion of the string pointed to by nptr to long int, long long int,
> +    unsigned long int, and unsigned long long int representation, respectively.
> +    First, they decompose the input string into three parts: an initial,
> +    possibly empty, sequence of white-space characters (as specified by the
> +    isspace function), a subject sequence resembling an integer represented in
> +    some radix determined by the value of base, and a final string of one or
> +    more unrecognized characters, including the terminating null character of
> +    the input string. Then, they attempt to convert the subject sequence to an
> +    integer, and return the result.
> +
> +    If the value of base is zero, the expected form of the subject sequence is
> +    that of an integer constant, optionally preceded
> +    by a plus or minus sign, but not including an integer suffix. If the value
> +    of base is between 2 and 36 (inclusive), the expected form of the subject
> +    sequence is a sequence of letters and digits representing an integer with
> +    the radix specified by base, optionally preceded by a plus or minus sign,
> +    but not including an integer suffix. The letters from a (or A) through z
> +    (or Z) are ascribed the values 10 through 35; only letters and digits whose
> +    ascribed values are less than that of base are permitted. If the value of
> +    base is 16, the characters 0x or 0X may optionally precede the sequence of
> +    letters and digits, following the sign if present.
> +
> +    The subject sequence is defined as the longest initial subsequence of the
> +    input string, starting with the first non-white-space character, that is of
> +    the expected form. The subject sequence contains no characters if the input
> +    string is empty or consists entirely of white space, or if the first
> +    non-white-space character is other than a sign or a permissible letter or digit.
> +
> +    If the subject sequence has the expected form and the value of base is
> +    zero, the sequence of characters starting with the first digit is
> +    interpreted as an integer constant. If the subject sequence has the
> +    expected form and the value of base is between 2 and 36, it is used as the
> +    base for conversion, ascribing to each letter its value as given above. If
> +    the subject sequence begins with a minus sign, the value resulting from the
> +    conversion is negated (in the return type). A pointer to the final string
> +    is stored in the object pointed to by endptr, provided that endptr is
> +    not a null pointer.
> +
> +    In other than the "C" locale, additional locale-specific subject sequence
> +    forms may be accepted.
> +
> +    If the subject sequence is empty or does not have the expected form, no
> +    conversion is performed; the value of nptr is stored in the object pointed
> +    to by endptr, provided that endptr is not a null pointer.
> +
> +  @return   The strtol, strtoll, strtoul, and strtoull functions return the
> +            converted value, if any. If no conversion could be performed, zero
> +            is returned. If the correct value is outside the range of
> +            representable values, LONG_MIN, LONG_MAX, LLONG_MIN, LLONG_MAX,
> +            ULONG_MAX, or ULLONG_MAX is returned (according to the return type
> +            and sign of the value, if any), and the value of the macro ERANGE
> +            is stored in errno.
> +**/
> +long
> +strtol(const char * nptr, char ** endptr, int base)
> +{
> +  const char *pEnd;
> +  long        Result = 0;
> +  long        Previous;
> +  int         temp;
> +  BOOLEAN     Negative = FALSE;
> +
> +  pEnd = nptr;
> +
> +  if((base < 0) || (base == 1) || (base > 36)) {
> +    if(endptr != NULL) {
> +    *endptr = NULL;
> +    }
> +    return 0;
> +  }
> +  // Skip leading spaces.
> +  while(isspace(*nptr))   ++nptr;
> +
> +  // Process Subject sequence: optional sign followed by digits.
> +  if(*nptr == '+') {
> +    Negative = FALSE;
> +    ++nptr;
> +  }
> +  else if(*nptr == '-') {
> +    Negative = TRUE;
> +    ++nptr;
> +  }
> +
> +  if(*nptr == '0') {  /* Might be Octal or Hex */
> +    if(toupper(nptr[1]) == 'X') {   /* Looks like Hex */
> +      if((base == 0) || (base == 16)) {
> +        nptr += 2;  /* Skip the "0X"      */
> +        base = 16;  /* In case base was 0 */
> +      }
> +    }
> +    else {    /* Looks like Octal */
> +      if((base == 0) || (base == 8)) {
> +        ++nptr;     /* Skip the leading "0" */
> +        base = 8;   /* In case base was 0   */
> +      }
> +    }
> +  }
> +  if(base == 0) {   /* If still zero then must be decimal */
> +    base = 10;
> +  }
> +  if(*nptr  == '0') {
> +    for( ; *nptr == '0'; ++nptr);  /* Skip any remaining leading zeros */
> +    pEnd = nptr;
> +  }
> +
> +  while( isalnum(*nptr) && ((temp = Digit2Val(*nptr)) < base)) {
> +    Previous = Result;
> +    Result = (Result * base) + (long int)temp;
> +    if( Result <= Previous) {   // Detect Overflow
> +      if(Negative) {
> +        Result = LONG_MIN;
> +      }
> +      else {
> +        Result = LONG_MAX;
> +      }
> +      Negative = FALSE;
> +      errno = ERANGE;
> +      break;
> +    }
> +    pEnd = ++nptr;
> +  }
> +  if(Negative) {
> +    Result = -Result;
> +  }
> +
> +  // Save pointer to final sequence
> +  if(endptr != NULL) {
> +    *endptr = (char *)pEnd;
> +  }
> +  return Result;
> +}
> +
> +/** The strtoull function converts the initial portion of the string pointed to
> +    by nptr to unsigned long long int representation.
> +
> +    See the description for strtol for more information.
> +
> +  @return   The strtoull function returns the converted value, if any. If no
> +            conversion could be performed, zero is returned. If the correct
> +            value is outside the range of representable values, ULLONG_MAX is
> +            returned and the value of the macro ERANGE is stored in errno.
> +**/
> +unsigned long long
> +strtoull(const char * nptr, char ** endptr, int base)
> +{
> +  const char           *pEnd;
> +  unsigned long long    Result = 0;
> +  unsigned long long    Previous;
> +  int                   temp;
> +
> +  pEnd = nptr;
> +
> +  if((base < 0) || (base == 1) || (base > 36)) {
> +    if(endptr != NULL) {
> +    *endptr = NULL;
> +    }
> +    return 0;
> +  }
> +  // Skip leading spaces.
> +  while(isspace(*nptr))   ++nptr;
> +
> +  // Process Subject sequence: optional + sign followed by digits.
> +  if(*nptr == '+') {
> +    ++nptr;
> +  }
> +
> +  if(*nptr == '0') {  /* Might be Octal or Hex */
> +    if(toupper(nptr[1]) == 'X') {   /* Looks like Hex */
> +      if((base == 0) || (base == 16)) {
> +        nptr += 2;  /* Skip the "0X"      */
> +        base = 16;  /* In case base was 0 */
> +      }
> +    }
> +    else {    /* Looks like Octal */
> +      if((base == 0) || (base == 8)) {
> +        ++nptr;     /* Skip the leading "0" */
> +        base = 8;   /* In case base was 0   */
> +      }
> +    }
> +  }
> +  if(base == 0) {   /* If still zero then must be decimal */
> +    base = 10;
> +  }
> +  if(*nptr  == '0') {
> +    for( ; *nptr == '0'; ++nptr);  /* Skip any remaining leading zeros */
> +    pEnd = nptr;
> +  }
> +
> +  while( isalnum(*nptr) && ((temp = Digit2Val(*nptr)) < base)) {
> +    Previous = Result;
> +    Result = DivU64x32 (Result, base) + (unsigned long long)temp;
> +    if( Result < Previous)  {   // If we overflowed
> +      Result = ULLONG_MAX;
> +      errno = ERANGE;
> +      break;
> +    }
> +    pEnd = ++nptr;
> +  }
> +
> +  // Save pointer to final sequence
> +  if(endptr != NULL) {
> +    *endptr = (char *)pEnd;
> +  }
> +  return Result;
> +}
> +
> +/**
> +  edk2 Jansson port does not support doubles, simply return 0.
> +
> +  These conversion functions convert the initial portion of the string
> +  pointed to by nptr to double, float, and long double representation,
> +  respectively.
> +
> +  The strtod(), strtof(), and strtold() functions return the converted
> +  value, if any.
> +
> +  If endptr is not NULL, a pointer to the character after the last charac-
> +  ter used in the conversion is stored in the location referenced by
> +  endptr.
> +
> +  If no conversion is performed, zero is returned and the value of nptr is
> +  stored in the location referenced by endptr.
> +
> +  If the correct value would cause overflow, plus or minus HUGE_VAL,
> +  HUGE_VALF, or HUGE_VALL is returned (according to the sign and type of
> +  the return value), and ERANGE is stored in errno.  If the correct value
> +  would cause underflow, zero is returned and ERANGE is stored in errno.
> +
> +  @return  Return 0.
> +**/
> +double
> +strtod (const char * __restrict nptr, char ** __restrict endptr) {
> +    if(endptr)
> +      *endptr = (char *)(nptr + strlen(nptr));
> +
> +    return (double)0;
> +}
> +
> +/**
> +  Allocate and zero-initialize array.
> +**/
> +void *
> +calloc(size_t Num, size_t Size)
> +{
> +  void       *RetVal;
> +  size_t      NumSize;
> +
> +  NumSize = Num * Size;
> +  RetVal  = NULL;
> +  if (NumSize != 0) {
> +  RetVal = malloc(NumSize);
> +  if( RetVal != NULL) {
> +    (VOID)ZeroMem( RetVal, NumSize);
> +  }
> +  }
> +  DEBUG((DEBUG_POOL, "0x%p = calloc(%d, %d)\n", RetVal, Num, Size));
> +
> +  return RetVal;
> +}
> +
> +//
> +//  The arrays give the cumulative number of days up to the first of the
> +//  month number used as the index (1 -> 12) for regular and leap years.
> +//  The value at index 13 is for the whole year.
> +//
> +UINTN CumulativeDays[2][14] = {
> +  {
> +    0,
> +    0,
> +    31,
> +    31 + 28,
> +    31 + 28 + 31,
> +    31 + 28 + 31 + 30,
> +    31 + 28 + 31 + 30 + 31,
> +    31 + 28 + 31 + 30 + 31 + 30,
> +    31 + 28 + 31 + 30 + 31 + 30 + 31,
> +    31 + 28 + 31 + 30 + 31 + 30 + 31 + 31,
> +    31 + 28 + 31 + 30 + 31 + 30 + 31 + 31 + 30,
> +    31 + 28 + 31 + 30 + 31 + 30 + 31 + 31 + 30 + 31,
> +    31 + 28 + 31 + 30 + 31 + 30 + 31 + 31 + 30 + 31 + 30,
> +    31 + 28 + 31 + 30 + 31 + 30 + 31 + 31 + 30 + 31 + 30 + 31
> +  },
> +  {
> +    0,
> +    0,
> +    31,
> +    31 + 29,
> +    31 + 29 + 31,
> +    31 + 29 + 31 + 30,
> +    31 + 29 + 31 + 30 + 31,
> +    31 + 29 + 31 + 30 + 31 + 30,
> +    31 + 29 + 31 + 30 + 31 + 30 + 31,
> +    31 + 29 + 31 + 30 + 31 + 30 + 31 + 31,
> +    31 + 29 + 31 + 30 + 31 + 30 + 31 + 31 + 30,
> +    31 + 29 + 31 + 30 + 31 + 30 + 31 + 31 + 30 + 31,
> +    31 + 29 + 31 + 30 + 31 + 30 + 31 + 31 + 30 + 31 + 30,
> +    31 + 29 + 31 + 30 + 31 + 30 + 31 + 31 + 30 + 31 + 30 + 31
> +  }
> +};
> +
> +#define IsLeap(y)   (((y) % 4) == 0 && (((y) % 100) != 0 || ((y) % 400) == 0))
> +#define SECSPERMIN  (60)
> +#define SECSPERHOUR (60 * 60)
> +#define SECSPERDAY  (24 * SECSPERHOUR)
> +
> +/**
> +  Get the system time as seconds elapsed since midnight, January 1, 1970.
> +**/
> +time_t time (time_t *timer)
> +{
> +  EFI_TIME  Time;
> +  time_t    CalTime;
> +  UINTN     Year;
> +
> +  //
> +  // Get the current time and date information
> +  //
> +  gRT->GetTime (&Time, NULL);
> +
> +  //
> +  // Years Handling
> +  // UTime should now be set to 00:00:00 on Jan 1 of the current year.
> +  //
> +  for (Year = 1970, CalTime = 0; Year != Time.Year; Year++) {
> +    CalTime = CalTime + (time_t)(CumulativeDays[IsLeap(Year)][13] * SECSPERDAY);
> +  }
> +
> +  //
> +  // Add in number of seconds for current Month, Day, Hour, Minute, Seconds, and TimeZone adjustment
> +  //
> +  CalTime = CalTime +
> +            (time_t)((Time.TimeZone != EFI_UNSPECIFIED_TIMEZONE) ? (Time.TimeZone * 60) : 0) +
> +            (time_t)(CumulativeDays[IsLeap(Time.Year)][Time.Month] * SECSPERDAY) +
> +            (time_t)(((Time.Day > 0) ? Time.Day - 1 : 0) * SECSPERDAY) +
> +            (time_t)(Time.Hour * SECSPERHOUR) +
> +            (time_t)(Time.Minute * 60) +
> +            (time_t)Time.Second;
> +
> +  if (timer != NULL) {
> +    *timer = CalTime;
> +  }
> +
> +  return CalTime;
> +}
> +
> +typedef
> +int
> +(*SORT_COMPARE)(
> +  IN  VOID  *Buffer1,
> +  IN  VOID  *Buffer2
> +  );
> +
> +/**
> +  Duplicated from EDKII BaseSortLib for qsort() wrapper
> +  @param[in, out] BufferToSort   on call a Buffer of (possibly sorted) elements
> +                                 on return a buffer of sorted elements
> +  @param[in] Count               the number of elements in the buffer to sort
> +  @param[in] ElementSize         Size of an element in bytes
> +  @param[in] CompareFunction     The function to call to perform the comparison
> +                                 of any 2 elements
> +  @param[in] Buffer              Buffer of size ElementSize for use in swapping
> +**/
> +STATIC
> +VOID
> +QuickSortWorker (
> +  IN OUT    VOID          *BufferToSort,
> +  IN CONST  UINTN         Count,
> +  IN CONST  UINTN         ElementSize,
> +  IN        SORT_COMPARE  CompareFunction,
> +  IN        VOID          *Buffer
> +  )
> +{
> +  VOID        *Pivot;
> +  UINTN       LoopCount;
> +  UINTN       NextSwapLocation;
> +
> +  ASSERT(BufferToSort    != NULL);
> +  ASSERT(CompareFunction != NULL);
> +  ASSERT(Buffer          != NULL);
> +
> +  if (Count < 2 || ElementSize  < 1) {
> +    return;
> +  }
> +
> +  NextSwapLocation = 0;
> +
> +  //
> +  // Pick a pivot (we choose last element)
> +  //
> +  Pivot = ((UINT8 *)BufferToSort + ((Count - 1) * ElementSize));
> +
> +  //
> +  // Now get the pivot such that all on "left" are below it
> +  // and everything "right" are above it
> +  //
> +  for (LoopCount = 0; LoopCount < Count - 1;  LoopCount++)
> +  {
> +    //
> +    // If the element is less than the pivot
> +    //
> +    if (CompareFunction ((VOID *)((UINT8 *)BufferToSort + ((LoopCount) * ElementSize)), Pivot) <= 0) {
> +      //
> +      // Swap
> +      //
> +      CopyMem (Buffer, (UINT8 *)BufferToSort + (NextSwapLocation * ElementSize), ElementSize);
> +      CopyMem ((UINT8 *)BufferToSort + (NextSwapLocation * ElementSize), (UINT8 *)BufferToSort + ((LoopCount) * ElementSize), ElementSize);
> +      CopyMem ((UINT8 *)BufferToSort + ((LoopCount) * ElementSize), Buffer, ElementSize);
> +
> +      //
> +      // Increment NextSwapLocation
> +      //
> +      NextSwapLocation++;
> +    }
> +  }
> +  //
> +  // Swap pivot to it's final position (NextSwapLocaiton)
> +  //
> +  CopyMem (Buffer, Pivot, ElementSize);
> +  CopyMem (Pivot, (UINT8 *)BufferToSort + (NextSwapLocation * ElementSize), ElementSize);
> +  CopyMem ((UINT8 *)BufferToSort + (NextSwapLocation * ElementSize), Buffer, ElementSize);
> +
> +  //
> +  // Now recurse on 2 paritial lists.  Neither of these will have the 'pivot' element.
> +  // IE list is sorted left half, pivot element, sorted right half...
> +  //
> +  QuickSortWorker (
> +    BufferToSort,
> +    NextSwapLocation,
> +    ElementSize,
> +    CompareFunction,
> +    Buffer
> +    );
> +
> +  QuickSortWorker (
> +    (UINT8 *)BufferToSort + (NextSwapLocation + 1) * ElementSize,
> +    Count - NextSwapLocation - 1,
> +    ElementSize,
> +    CompareFunction,
> +    Buffer
> +    );
> +
> +  return;
> +}
> +
> +/**
> +  Performs a quick sort
> +**/
> +void qsort (void *base, size_t num, size_t width, int (*compare)(const void *, const void *))
> +{
> +  VOID  *Buffer;
> +
> +  ASSERT (base    != NULL);
> +  ASSERT (compare != NULL);
> +
> +  //
> +  // Use CRT-style malloc to cover BS and RT memory allocation.
> +  //
> +  Buffer = malloc (width);
> +  ASSERT (Buffer != NULL);
> +
> +  //
> +  // Re-use PerformQuickSort() function Implementation in EDKII BaseSortLib.
> +  //
> +  QuickSortWorker (base, (UINTN)num, (UINTN)width, (SORT_COMPARE)compare, Buffer);
> +
> +  free (Buffer);
> +  return;
> +}
> +
> +/**
> +  Get character from stream, we don't support file operastion on edk2 JSON library.
> +
> +  @return Returns the character currently pointed by the internal file position indicator of the specified stream
> +
> +**/
> +int fgetc(FILE * _File){
> +   return 0;
> +}
> diff --git a/RedfishPkg/Library/JsonLib/JanssonCrtLibSupport.h b/RedfishPkg/Library/JsonLib/JanssonCrtLibSupport.h
> new file mode 100644
> index 0000000000..40a98e485c
> --- /dev/null
> +++ b/RedfishPkg/Library/JsonLib/JanssonCrtLibSupport.h
> @@ -0,0 +1,196 @@
> +/** @file
> +  CRT wrapper head functions for jansson system call.
> +
> + Copyright (c) 2019, Intel Corporation. All rights reserved.<BR>
> + (C) Copyright 2020 Hewlett Packard Enterprise Development LP<BR>
> +
> +    SPDX-License-Identifier: BSD-2-Clause-Patent
> +
> +**/
> +
> +#ifndef JANSSON_CRT_LIB_SUPPORT_H_
> +#define JANSSON_CRT_LIB_SUPPORT_H_
> +
> +#include <Library/BaseLib.h>
> +#include <Library/BaseMemoryLib.h>
> +#include <Library/DebugLib.h>
> +#include <Library/PrintLib.h>
> +
> +#define MAX_STRING_SIZE  0x10000000
> +
> +// Minimum value for an object of type long long int.
> +#define LLONG_MIN   (-9223372036854775807LL - 1LL)  // -(2^63 - 1)

MIN_INT64

> +
> +// Maximum value for an object of type long long int.
> +#define LLONG_MAX   9223372036854775807LL // 2^63 - 1

MAX_INT64

> +
> +// We dont support double on edk2
> +#define HUGE_VAL    0
> +
> +#if defined(MDE_CPU_X64) || defined(MDE_CPU_AARCH64) || defined(MDE_CPU_IA64) || defined(MDE_CPU_RISCV64)
> +//
> +// With GCC we would normally use SIXTY_FOUR_BIT_LONG, but MSVC needs
> +// SIXTY_FOUR_BIT, because 'long' is 32-bit and only 'long long' is
> +// 64-bit. Since using 'long long' works fine on GCC too, just do that.
> +//
> +#define SIXTY_FOUR_BIT
> +#elif defined(MDE_CPU_IA32) || defined(MDE_CPU_ARM) || defined(MDE_CPU_EBC)
> +#define THIRTY_TWO_BIT
> +#endif
> +
> +//
> +// Map all va_xxxx elements to VA_xxx defined in MdePkg/Include/Base.h
> +//
> +#if !defined(__CC_ARM) // if va_list is not already defined
> +#define va_list   VA_LIST
> +#define va_arg    VA_ARG
> +#define va_start  VA_START
> +#define va_end    VA_END
> +#else // __CC_ARM
> +#define va_start(Marker, Parameter)   __va_start(Marker, Parameter)
> +#define va_arg(Marker, TYPE)          __va_arg(Marker, TYPE)
> +#define va_end(Marker)                ((void)0)
> +#endif
> +
> +//
> +// Definitions for global constants used by CRT library routines
> +//
> +#define EINVAL       22               /* Invalid argument */
> +#define INT_MAX      0x7FFFFFFF       /* Maximum (signed) int value */
> +#define LONG_MAX     0X7FFFFFFFL      /* max value for a long */
> +#define LONG_MIN     (-LONG_MAX-1)    /* min value for a long */
> +#define ULONG_MAX    0xFFFFFFFF       /* Maximum unsigned long value */
> +#define CHAR_BIT     8                /* Number of bits in a char */

Take from ProcessorBind.h?
EINVAL should be separated frome variable properties by at least a
blank line.

> +
> +// Maximum value for an object of type unsigned long long int.
> +#define ULLONG_MAX  0xFFFFFFFFFFFFFFFFULL // 2^64 - 1
> +// Maximum value for an object of type unsigned char.
> +#define UCHAR_MAX   255  // 2^8 - 1
> +
> +//
> +// Basic types mapping
> +//
> +typedef UINTN          size_t;
> +typedef INTN           ssize_t;
> +typedef INT32          time_t;
> +typedef UINT8          __uint8_t;
> +typedef UINT8          sa_family_t;
> +typedef UINT32         uid_t;
> +typedef UINT32         gid_t;
> +typedef INT32          int32_t;
> +typedef UINT32         uint32_t;
> +typedef UINT16         uint16_t;
> +typedef UINT8          uint8_t;
> +typedef enum {false, true} bool;
> +
> +//
> +// File operations are not required for EFI building,
> +// so FILE is mapped to VOID * to pass build
> +//
> +typedef VOID  *FILE;
> +
> +//
> +// Global variables
> +//
> +extern int  errno;
> +extern FILE *stderr;
> +
> +//
> +// Function prototypes of CRT Library routines
> +//
> +void           *malloc     (size_t);
> +void           *realloc    (void *, size_t);
> +void           *calloc     (size_t Num, size_t Size);
> +void           free        (void *);
> +void           *memset     (void *, int, size_t);
> +int            memcmp      (const void *, const void *, size_t);
> +int            isdigit     (int);
> +int            isspace     (int);
> +int            tolower     (int);
> +int            isupper     (int);
> +int            isxdigit    (int);
> +int            isalnum     (int);
> +void           *memcpy     (void *, const void *, size_t);
> +void           *memset     (void *, int, size_t);
> +void           *memchr     (const void *, int, size_t);
> +int            memcmp      (const void *, const void *, size_t);
> +void           *memmove    (void *, const void *, size_t);
> +int            strcmp      (const char *, const char *);
> +int            strncmp     (const char *, const char *, size_t);
> +char           *strcpy     (char *, const char *);
> +size_t         strlen      (const char *);
> +char           *strcat     (char *, const char *);
> +char           *strchr     (const char *, int);
> +int            strcasecmp  (const char *, const char *);
> +int            strncasecmp (const char *, const char *, size_t);
> +char           *strncpy    (char *, size_t, const char *, size_t);
> +int            strncmp     (const char *, const char *, size_t);
> +char           *strrchr    (const char *, int);
> +unsigned long  strtoul     (const char *, char **, int);
> +char *         strstr      (const char *s1 , const char *s2);
> +long           strtol      (const char *, char **, int);
> +char           *strerror   (int);
> +size_t         strspn      (const char *, const char *);
> +char *         strdup      (const char *str);
> +char *         strpbrk     (const char *s1, const char *s2);
> +unsigned long long strtoull(const char * nptr, char ** endptr, int base);
> +long long      strtoll     (const char * nptr, char ** endptr, int base);
> +long           strtol      (const char * nptr, char ** endptr, int base);
> +double         strtod      (const char * __restrict nptr, char ** __restrict endptr);
> +size_t         strcspn     (const char *, const char *);
> +int            printf      (const char *, ...);
> +int            sscanf      (const char *, const char *, ...);
> +FILE           *fopen      (const char *, const char *);
> +size_t         fread       (void *, size_t, size_t, FILE *);
> +size_t         fwrite      (const void *, size_t, size_t, FILE *);
> +int            fclose      (FILE *);
> +int            fprintf     (FILE *, const char *, ...);
> +int            fgetc       (FILE * _File);
> +uid_t          getuid      (void);
> +uid_t          geteuid     (void);
> +gid_t          getgid      (void);
> +gid_t          getegid     (void);
> +void           qsort       (void *, size_t, size_t, int (*)(const void *, const void *));
> +char           *getenv     (const char *);
> +#if defined(__GNUC__) && (__GNUC__ >= 2)
> +void           abort       (void) __attribute__((__noreturn__));
> +#else
> +void           abort       (void);
> +#endif
> +int            toupper     (int);
> +int            Digit2Val   (int);
> +time_t         time        (time_t *);
> +
> +//
> +// Macros that directly map functions to BaseLib, BaseMemoryLib, and DebugLib functions
> +//
> +#define strcmp                            AsciiStrCmp
> +#define memcpy(dest,source,count)         CopyMem(dest,source,(UINTN)(count))
> +#define memset(dest,ch,count)             SetMem(dest,(UINTN)(count),(UINT8)(ch))
> +#define memchr(buf,ch,count)              ScanMem8(buf,(UINTN)(count),(UINT8)ch)
> +#define memcmp(buf1,buf2,count)           (int)(CompareMem(buf1,buf2,(UINTN)(count)))
> +#define memmove(dest,source,count)        CopyMem(dest,source,(UINTN)(count))
> +#define strlen(str)                       (size_t)(AsciiStrnLenS(str,MAX_STRING_SIZE))
> +#define strcpy(strDest,strSource)         AsciiStrCpyS(strDest,(strlen(strSource)+1),strSource)
> +#define strncpy(strDest,strSource,count)  AsciiStrnCpyS(strDest,(UINTN)count,strSource,(UINTN)count)
> +#define strncpys(strDest, DestLen, strSource,count)  AsciiStrnCpyS(strDest,DestLen,strSource,(UINTN)count)
> +#define strcat(strDest,strSource)         AsciiStrCatS(strDest,(strlen(strSource)+strlen(strDest)+1),strSource)
> +#define strchr(str,ch)                    ScanMem8((VOID *)(str),AsciiStrSize(str),(UINT8)ch)
> +#define strncmp(string1,string2,count)    (int)(AsciiStrnCmp(string1,string2,(UINTN)(count)))
> +#define strcasecmp(str1,str2)             (int)AsciiStriCmp(str1,str2)
> +#define strstr(s1,s2)                     AsciiStrStr(s1,s2)
> +#define sprintf(buf,...)                  AsciiSPrint(buf,MAX_STRING_SIZE,__VA_ARGS__)
> +#define snprintf(buf,len,...)             AsciiSPrint(buf,len,__VA_ARGS__)
> +#define vsnprintf(buf,len,format,marker)  AsciiVSPrint((buf),(len),(format),(marker))
> +#define assert(expression)

Not ASSERT?

> +#define atoi(nptr)                        AsciiStrDecimalToUintn(nptr)
> +#define fabs(x) (((x)<0.0)?(-x):(x))

Indentation.

> +#define offsetof(type,member)             OFFSET_OF(type,member)
> +
> +#define EOF (-1)
> +
> +extern int  errno;
> +
> +#define ERANGE   34                /* 34   Result too large */
> +
> +#endif
> diff --git a/RedfishPkg/Library/JsonLib/JsonLib.c b/RedfishPkg/Library/JsonLib/JsonLib.c
> new file mode 100644
> index 0000000000..3fa834add3
> --- /dev/null
> +++ b/RedfishPkg/Library/JsonLib/JsonLib.c
> @@ -0,0 +1,960 @@
> +/** @file
> +  APIs for JSON operations.
> +
> +  Copyright (c) 2018 - 2019, Intel Corporation. All rights reserved.<BR>
> + (C) Copyright 2020 Hewlett Packard Enterprise Development LP<BR>
> +
> +    SPDX-License-Identifier: BSD-2-Clause-Patent
> +**/
> +
> +#include <Library/JsonLib.h>
> +#include "JsonUtilities.h"
> +
> +/**
> +  The function is used to convert a NULL terminated UTF8 encoded string to a JSON
> +  value. Only object and array represented strings can be converted successfully,
> +  since they are the only valid root values of a JSON text for UEFI usage.
> +
> +  Real number and number with exponent part are not supportted by UEFI.
> +
> +  Caller needs to cleanup the root value by calling JsonValueFree().
> +
> +  @param[in]   Text             The NULL terminated UTF8 encoded string to convert
> +
> +  @retval      Array JSON value or object JSON value, or NULL when any error occurs.
> +
> +**/
> +EDKII_JSON_VALUE
> +EFIAPI
> +TextToJson (
> +  IN    CHAR8*    Text
> +  )
> +{
> +  json_error_t    JsonError;
> +
> +  return (EDKII_JSON_VALUE) json_loads (Text, 0, &JsonError);
> +}
> +
> +/**
> +  The function is used to convert the JSON root value to a UTF8 encoded string which
> +  is terminated by NULL, or return NULL on error.
> +
> +  Only array JSON value or object JSON value is valid for converting, and caller is
> +  responsible for free converted string.
> +
> +  @param[in]   Json               The JSON value to be converted
> +
> +  @retval      The JSON value converted UTF8 string or NULL.
> +
> +**/
> +CHAR8*
> +EFIAPI
> +JsonToText (
> +  IN    EDKII_JSON_VALUE    Json
> +  )
> +{
> +  if (!JsonValueIsArray (Json) && !JsonValueIsObject (Json)) {
> +    return NULL;
> +  }
> +
> +  return json_dumps ((json_t *) Json, 0);

No space after cast (please sanity check throughout).

> +}
> +
> +/**
> +  The function is used to initialize a JSON value which contains a new JSON array,
> +  or NULL on error. Initially, the array is empty.
> +
> +  The reference count of this value will be set to 1, and caller needs to cleanup the
> +  value by calling JsonValueFree().
> +
> +  More details for reference count strategy can refer to the API description for JsonValueFree().
> +
> +  @retval      The created JSON value which contains a JSON array or NULL.
> +
> +**/
> +EDKII_JSON_VALUE
> +EFIAPI
> +JsonValueInitArray (
> +  VOID
> +  )
> +{
> +  return (EDKII_JSON_VALUE) json_array();
> +}
> +
> +/**
> +  The function is used to initialize a JSON value which contains a new JSON object,
> +  or NULL on error. Initially, the object is empty.
> +
> +  The reference count of this value will be set to 1, and caller needs to cleanup the
> +  value by calling JsonValueFree().
> +
> +  More details for reference count strategy can refer to the API description for JsonValueFree().
> +
> +  @retval      The created JSON value which contains a JSON object or NULL.
> +
> +**/
> +EDKII_JSON_VALUE
> +EFIAPI
> +JsonValueInitObject (
> +  VOID
> +  )
> +{
> +  return (EDKII_JSON_VALUE) json_object();
> +}
> +
> +/**
> +  The function is used to initialize a JSON value which contains a new JSON string,
> +  or NULL on error.
> +
> +  The input string must be NULL terminated Ascii format, non-Ascii characters will
> +  be processed as an error. Unicode characters can also be represented by Ascii string
> +  as the format: \u + 4 hexadecimal digits, like \u3E5A, or \u003F.
> +
> +  The reference count of this value will be set to 1, and caller needs to cleanup the
> +  value by calling JsonValueFree().
> +
> +  More details for reference count strategy can refer to the API description for JsonValueFree().
> +
> +  @param[in]   String      The Ascii string to initialize to JSON value
> +
> +  @retval      The created JSON value which contains a JSON string or NULL. Select a
> +               Getter API for a specific encoding format.
> +
> +**/
> +EDKII_JSON_VALUE
> +EFIAPI
> +JsonValueInitAsciiString (
> +  IN    CONST CHAR8    *String
> +  )
> +{
> +  UINTN    Index;
> +
> +  if (String == NULL) {
> +    return NULL;
> +  }
> +
> +  Index = 0;
> +  while (*(String + Index) != '\0') {
> +    if (((*(String + Index)) & 0x80) != 0x00) {
> +      return NULL;
> +    }
> +
> +    Index ++;

No space before ++.

> +  }
> +
> +  return (EDKII_JSON_VALUE) json_string (String);
> +}
> +
> +/**
> +  The function is used to initialize a JSON value which contains a new JSON string,
> +  or NULL on error.
> +
> +  The input must be a NULL terminated UCS2 format Unicode string.
> +
> +  The reference count of this value will be set to 1, and caller needs to cleanup the
> +  value by calling JsonValueFree().
> +
> +  More details for reference count strategy can refer to the API description for JsonValueFree().
> +
> +  @param[in]   String      The Unicode string to initialize to JSON value
> +
> +  @retval      The created JSON value which contains a JSON string or NULL. Select a
> +               Getter API for a specific encoding format.
> +
> +**/
> +EDKII_JSON_VALUE
> +EFIAPI
> +JsonValueInitUnicodeString (
> +  IN    CHAR16    *String
> +  )
> +{
> +  EFI_STATUS    Status;
> +  CHAR8         *Utf8Str;
> +
> +  if (String == NULL) {
> +    return NULL;
> +  }
> +
> +  Utf8Str = NULL;
> +  Status  = UCS2StrToUTF8 (String, &Utf8Str);
> +  if (EFI_ERROR (Status)) {
> +    return NULL;
> +  }
> +
> +  return (EDKII_JSON_VALUE) json_string (Utf8Str);
> +}
> +
> +/**
> +  The function is used to initialize a JSON value which contains a new JSON integer,
> +  or NULL on error.
> +
> +  The reference count of this value will be set to 1, and caller needs to cleanup the
> +  value by calling JsonValueFree().
> +
> +  More details for reference count strategy can refer to the API description for JsonValueFree().
> +
> +  @param[in]   Value       The integer to initialize to JSON value
> +
> +  @retval      The created JSON value which contains a JSON number or NULL.
> +
> +**/
> +EDKII_JSON_VALUE
> +EFIAPI
> +JsonValueInitNumber (
> +  IN    INT64    Value
> +  )
> +{
> +  return (EDKII_JSON_VALUE) json_integer (Value);
> +}
> +
> +/**
> +  The function is used to initialize a JSON value which contains a new JSON boolean,
> +  or NULL on error.
> +
> +  Boolean JSON value is kept as static value, and no need to do any cleanup work.
> +
> +  @param[in]   Value       The boolean value to initialize.
> +
> +  @retval      The created JSON value which contains a JSON boolean or NULL.
> +
> +**/
> +EDKII_JSON_VALUE
> +EFIAPI
> +JsonValueInitBoolean (
> +  IN    BOOLEAN    Value
> +  )
> +{
> +  return (EDKII_JSON_VALUE) json_boolean (Value);
> +}
> +
> +/**
> +  The function is used to initialize a JSON value which contains a new JSON NULL,
> +  or NULL on error.
> +
> +  NULL JSON value is kept as static value, and no need to do any cleanup work.
> +
> +  @retval      The created NULL JSON value.
> +
> +**/
> +EDKII_JSON_VALUE
> +EFIAPI
> +JsonValueInitNull (
> +  VOID
> +  )
> +{
> +  return (EDKII_JSON_VALUE) json_null();
> +}
> +
> +/**
> +  The function is used to decrease the reference count of a JSON value by one, and once
> +  this reference count drops to zero, the value is destroyed and it can no longer be used.
> +  If this destroyed value is object type or array type, reference counts for all containing
> +  JSON values will be decreased by 1. Boolean JSON value and NULL JSON value won't be destroyed
> +  since they are static values kept in memory.
> +
> +  Reference Count Strategy: BaseJsonLib uses this strategy to track whether a value is still
> +  in use or not. When a value is created, it's reference count is set to 1. If a reference to a
> +  value is kept for use, its reference count is incremented, and when the value is no longer
> +  needed, the reference count is decremented. When the reference count drops to zero, there are
> +  no references left, and the value can be destroyed.
> +
> +  The given JSON value maybe NULL and not causing any problem. Just output the debug message
> +  to inform caller the NULL value is passed in.
> +
> +  @param[in]   Json             The JSON value to be freed. json_decref may return without any
> +                                changes if Json is NULL.
> +
> +**/
> +VOID
> +EFIAPI
> +JsonValueFree (
> +  IN    EDKII_JSON_VALUE    Json
> +  )
> +{
> +  json_decref((json_t *)Json);
> +}
> +
> +/**
> +  The function is used to create a fresh copy of a JSON value, and all child values are deep
> +  copied in a recursive fashion. It should be called when this JSON value might be modified
> +  in later use, but the original still wants to be used in somewhere else.
> +
> +  Reference counts of the returned root JSON value and all child values will be set to 1, and
> +  caller needs to cleanup the root value by calling JsonValueFree().
> +
> +  * Note: Since this function performs a copy from bottom to up, too many calls may cause some
> +  performance issues, user should avoid unnecessary calls to this function unless it is really
> +  needed.
> +
> +  @param[in]   Json             The JSON value to be cloned.
> +
> +  @retval      Return the cloned JSON value, or NULL on error.
> +
> +**/
> +EDKII_JSON_VALUE
> +EFIAPI
> +JsonValueClone (
> +  IN    EDKII_JSON_VALUE    Json
> +  )
> +{
> +  return (EDKII_JSON_VALUE) json_deep_copy ((json_t *) Json);
> +}
> +
> +/**
> +  The function is used to return if the provided JSON value contains a JSON array.
> +
> +  @param[in]   Json             The provided JSON value.
> +
> +  @retval      TRUE             The JSON value contains a JSON array.
> +  @retval      FALSE            The JSON value doesn't contain a JSON array.
> +
> +**/
> +BOOLEAN
> +EFIAPI
> +JsonValueIsArray (
> +  IN    EDKII_JSON_VALUE    Json
> +  )
> +{
> +  return json_is_array ((json_t *) Json);
> +}
> +
> +/**
> +  The function is used to return if the provided JSON value contains a JSON object.
> +
> +  @param[in]   Json             The provided JSON value.
> +
> +  @retval      TRUE             The JSON value contains a JSON object.
> +  @retval      FALSE            The JSON value doesn't contain a JSON object.
> +
> +**/
> +BOOLEAN
> +EFIAPI
> +JsonValueIsObject (
> +  IN    EDKII_JSON_VALUE    Json
> +  )
> +{
> +  return json_is_object ((json_t *) Json);
> +}
> +
> +/**
> +  The function is used to return if the provided JSON Value contains a string, Ascii or
> +  Unicode format is not differentiated.
> +
> +  @param[in]   Json             The provided JSON value.
> +
> +  @retval      TRUE             The JSON value contains a JSON string.
> +  @retval      FALSE            The JSON value doesn't contain a JSON string.
> +
> +**/
> +BOOLEAN
> +EFIAPI
> +JsonValueIsString (
> +  IN    EDKII_JSON_VALUE    Json
> +  )
> +{
> +  return json_is_string ((json_t *) Json);
> +}
> +
> +/**
> +  The function is used to return if the provided JSON value contains a JSON number.
> +
> +  @param[in]   Json             The provided JSON value.
> +
> +  @retval      TRUE             The JSON value is contains JSON number.
> +  @retval      FALSE            The JSON value doesn't contain a JSON number.
> +
> +**/
> +BOOLEAN
> +EFIAPI
> +JsonValueIsNumber (
> +  IN    EDKII_JSON_VALUE    Json
> +  )
> +{
> +  return json_is_integer ((json_t *) Json);
> +}
> +
> +/**
> +  The function is used to return if the provided JSON value contains a JSON boolean.
> +
> +  @param[in]   Json             The provided JSON value.
> +
> +  @retval      TRUE             The JSON value contains a JSON boolean.
> +  @retval      FALSE            The JSON value doesn't contain a JSON boolean.
> +
> +**/
> +BOOLEAN
> +EFIAPI
> +JsonValueIsBoolean (
> +  IN    EDKII_JSON_VALUE    Json
> +  )
> +{
> +  return json_is_boolean ((json_t *) Json);
> +}
> +
> +/**
> +  The function is used to return if the provided JSON value contains a JSON NULL.
> +
> +  @param[in]   Json             The provided JSON value.
> +
> +  @retval      TRUE             The JSON value contains a JSON NULL.
> +  @retval      FALSE            The JSON value doesn't contain a JSON NULL.
> +
> +**/
> +BOOLEAN
> +EFIAPI
> +JsonValueIsNull (
> +  IN    EDKII_JSON_VALUE    Json
> +  )
> +{
> +  return json_is_null ((json_t *) Json);
> +}
> +
> +/**
> +  The function is used to retrieve the associated array in an array type JSON value.
> +
> +  Any changes to the returned array will impact the original JSON value.
> +
> +  @param[in]   Json             The provided JSON value.
> +
> +  @retval      Return the associated array in JSON value or NULL.
> +
> +**/
> +EDKII_JSON_ARRAY
> +EFIAPI
> +JsonValueGetArray (
> +  IN    EDKII_JSON_VALUE    Json
> +  )
> +{
> +  if (Json == NULL || !JsonValueIsArray (Json)) {
> +    return NULL;
> +  }
> +
> +  return (EDKII_JSON_ARRAY) Json;
> +}
> +
> +/**
> +  The function is used to retrieve the associated object in an object type JSON value.
> +
> +  Any changes to the returned object will impact the original JSON value.
> +
> +  @param[in]   Json             The provided JSON value.
> +
> +  @retval      Return the associated object in JSON value or NULL.
> +
> +**/
> +EDKII_JSON_OBJECT
> +EFIAPI
> +JsonValueGetObject (
> +  IN    EDKII_JSON_VALUE    Json
> +  )
> +{
> +  if (Json == NULL || !JsonValueIsObject (Json)) {
> +    return NULL;
> +  }
> +
> +  return (EDKII_JSON_OBJECT) Json;
> +}
> +
> +/**
> +  The function is used to retrieve the associated Ascii string in a string type JSON value.
> +
> +  Any changes to the returned string will impact the original JSON value.
> +
> +  @param[in]   Json             The provided JSON value.
> +
> +  @retval      Return the associated Ascii string in JSON value or NULL.
> +
> +**/
> +CHAR8*
> +EFIAPI
> +JsonValueGetAsciiString (
> +  IN    EDKII_JSON_VALUE    Json
> +  )
> +{
> +  CHAR8          *AsciiStr;
> +  UINTN          Index;
> +
> +  AsciiStr = (CHAR8 *)  ((json_t *) Json);
> +  if (AsciiStr == NULL) {
> +    return NULL;
> +  }
> +
> +  Index = 0;
> +  while (*(AsciiStr + Index) != '\0') {
> +    if (((*(AsciiStr + Index)) & 0x80) != 0x00) {
> +      return NULL;
> +    }
> +
> +    Index ++;
> +  }
> +
> +  return AsciiStr;
> +}
> +
> +/**
> +  The function is used to retrieve the associated Unicode string in a string type JSON value.
> +
> +  Caller can do any changes to the returned string without any impact to the original JSON
> +  value, and caller needs to free the returned string.
> +
> +  @param[in]   Json             The provided JSON value.
> +
> +  @retval      Return the associated Unicode string in JSON value or NULL.
> +
> +**/
> +CHAR16*
> +EFIAPI
> +JsonValueGetUnicodeString (
> +  IN    EDKII_JSON_VALUE    Json
> +  )
> +{
> +  EFI_STATUS     Status;
> +  CONST CHAR8    *Utf8Str;
> +  CHAR16         *Ucs2Str;
> +
> +  Utf8Str = json_string_value ((json_t *) Json);
> +  if (Utf8Str == NULL) {
> +    return NULL;
> +  }
> +
> +  Status = UTF8StrToUCS2 ((CHAR8*)Utf8Str, &Ucs2Str);
> +  if (EFI_ERROR (Status)) {
> +    return NULL;
> +  }
> +
> +  return Ucs2Str;
> +}
> +
> +/**
> +  The function is used to retrieve the associated integer in a number type JSON value.
> +
> +  The input JSON value should not be NULL or contain no JSON number, otherwise it will
> +  ASSERT() and return 0.
> +
> +  @param[in]   Json             The provided JSON value.
> +
> +  @retval      Return the associated number in JSON value.
> +
> +**/
> +INT64
> +EFIAPI
> +JsonValueGetNumber (
> +  IN    EDKII_JSON_VALUE    Json
> +  )
> +{
> +  ASSERT (Json != NULL && JsonValueIsNumber (Json));
> +  if (Json == NULL || !JsonValueIsNumber (Json)) {
> +    return 0;
> +  }
> +
> +  return json_integer_value ((json_t *) Json);
> +}
> +
> +/**
> +  The function is used to retrieve the associated boolean in a boolean type JSON value.
> +
> +  The input JSON value should not be NULL or contain no JSON boolean, otherwise it will
> +  ASSERT() and return FALSE.
> +
> +  @param[in]   Json             The provided JSON value.
> +
> +  @retval      Return the associated value of JSON boolean.
> +
> +**/
> +BOOLEAN
> +EFIAPI
> +JsonValueGetBoolean (
> +  IN    EDKII_JSON_VALUE    Json
> +  )
> +{
> +  ASSERT (Json != NULL && JsonValueIsBoolean (Json));
> +  if (Json == NULL || !JsonValueIsBoolean (Json)) {
> +    return FALSE;
> +  }
> +
> +  return json_is_true ((json_t *) Json);
> +}
> +
> +/**
> +  The function is used to retrieve the associated string in a string type JSON value.
> +
> +  Any changes to the returned string will impact the original JSON value.
> +
> +  @param[in]   Json The provided JSON value.
> +
> +  @retval      Return the associated Ascii string in JSON value or NULL.
> +
> +**/
> +CONST CHAR8*
> +EFIAPI
> +JsonValueGetString (
> +  IN    EDKII_JSON_VALUE    Json
> +  )
> +{
> +  return json_string_value ((const json_t *)Json);
> +}
> +
> +/**
> +  The function is used to get the number of elements in a JSON object, or 0 if it is NULL or
> +  not a JSON object.
> +
> +  @param[in]   JsonObject              The provided JSON object.
> +
> +  @retval      Return the number of elements in this JSON object or 0.
> +
> +**/
> +UINTN
> +EFIAPI
> +JsonObjectSize (
> +  IN    EDKII_JSON_OBJECT    JsonObject
> +  )
> +{
> +  return json_object_size ((json_t *) JsonObject);
> +}
> +
> +/**
> +  The function is used to enumerate all keys in a JSON object.
> +
> +  Caller should be responsible to free the returned key array refference. But contained keys
> +  are read only and must not be modified or freed.
> +
> +  @param[in]   JsonObj                The provided JSON object for enumeration.
> +  @param[out]  KeyCount               The count of keys in this JSON object.
> +
> +  @retval      Return an array of the enumerated keys in this JSON object or NULL.
> +
> +**/
> +CHAR8**
> +JsonObjectGetKeys (
> +  IN    EDKII_JSON_OBJECT    JsonObj,
> +  OUT   UINTN                *KeyCount
> +  )
> +{
> +
> +  UINTN               Index;
> +  CONST CHAR8         **KeyArray;
> +  CONST CHAR8         *Key;
> +  EDKII_JSON_VALUE    Value;
> +
> +  if (JsonObj == NULL || KeyCount == NULL) {
> +    return NULL;
> +  }
> +
> +  Index = 0;
> +  json_object_foreach(JsonObj, Key, Value) {
> +    Index ++;
> +  }
> +  if (Index == 0) {
> +    *KeyCount = 0;
> +    return NULL;
> +  }
> +
> +  *KeyCount = Index;
> +  KeyArray = (CONST CHAR8 **) AllocateZeroPool (*KeyCount * sizeof (CHAR8 *));
> +  if (KeyArray == NULL) {
> +    return NULL;
> +  }
> +
> +  Key   = NULL;
> +  Value = NULL;
> +  Index = 0;
> +  json_object_foreach((json_t *) JsonObj, Key, Value) {
> +    KeyArray[Index] = Key;
> +    Index ++;
> +  }
> +
> +  return (CHAR8 **)KeyArray;
> +}
> +
> +/**
> +  The function is used to get a JSON value corresponding to the input key from a JSON object.
> +
> +  It only returns a reference to this value and any changes on this value will impact the
> +  original JSON object. If that is not expected, please call JsonValueClone() to clone it to
> +  use.
> +
> +  Input key must be a valid NULL terminated UTF8 encoded string. NULL will be returned when
> +  Key-Value is not found in this JSON object.
> +
> +  @param[in]   JsonObj           The provided JSON object.
> +  @param[in]   Key               The key of the JSON value to be retrieved.
> +
> +  @retval      Return the corresponding JSON value to key, or NULL on error.
> +
> +**/
> +EDKII_JSON_VALUE
> +EFIAPI
> +JsonObjectGetValue (
> +  IN    CONST EDKII_JSON_OBJECT    JsonObj,
> +  IN    CONST CHAR8                *Key
> +  )
> +{
> +  return (EDKII_JSON_VALUE) json_object_get ((const json_t *)JsonObj, (const char *)Key);
> +}
> +
> +/**
> +  The function is used to set a JSON value corresponding to the input key from a JSON object,
> +  and the reference count of this value will be increased by 1.
> +
> +  Input key must be a valid NULL terminated UTF8 encoded string. If there already is a value for
> +  this key, this key will be assigned to the new JSON value. The old JSON value will be removed
> +  from this object and thus its' reference count will be decreased by 1.
> +
> +  More details for reference count strategy can refer to the API description for JsonValueFree().
> +
> +  @param[in]   JsonObj                The provided JSON object.
> +  @param[in]   Key                    The key of the JSON value to be set.
> +  @param[in]   Json                   The JSON value to set to this JSON object mapped by key.
> +
> +  @retval      EFI_ABORTED            Some error occur and operation aborted.
> +  @retval      EFI_SUCCESS            The JSON value has been set to this JSON object.
> +
> +**/
> +EFI_STATUS
> +EFIAPI
> +JsonObjectSetValue (
> +  IN    EDKII_JSON_OBJECT    JsonObj,
> +  IN    CONST CHAR8          *Key,
> +  IN    EDKII_JSON_VALUE     Json
> +  )
> +{
> +  if (json_object_set ((json_t *) JsonObj, Key, (json_t *) Json) != 0) {
> +    return EFI_ABORTED;
> +  } else {
> +    return EFI_SUCCESS;
> +  }
> +}
> +
> +/**
> +  The function is used to get the number of elements in a JSON array, or 0 if it is NULL or
> +  not a JSON array.
> +
> +  @param[in]   JsonArray              The provided JSON array.
> +
> +  @retval      Return the number of elements in this JSON array or 0.
> +
> +**/
> +UINTN
> +EFIAPI
> +JsonArrayCount (
> +  IN    EDKII_JSON_ARRAY    JsonArray
> +  )
> +{
> +  return json_array_size ((json_t *) JsonArray);
> +}
> +
> +/**
> +  The function is used to return the JSON value in the array at position index. The valid range
> +  for this index is from 0 to the return value of JsonArrayCount() minus 1.
> +
> +  It only returns a reference to this value and any changes on this value will impact the
> +  original JSON object. If that is not expected, please call JsonValueClone() to clone it to
> +  use.
> +
> +  If this array is NULL or not a JSON array, or if index is out of range, NULL will be returned.
> +
> +  @param[in]   JsonArray         The provided JSON Array.
> +
> +  @retval      Return the JSON value located in the Index position or NULL.
> +
> +**/
> +EDKII_JSON_VALUE
> +EFIAPI
> +JsonArrayGetValue (
> +  IN    EDKII_JSON_ARRAY    JsonArray,
> +  IN    UINTN               Index
> +  )
> +{
> +  return (EDKII_JSON_VALUE) json_array_get ((json_t *) JsonArray, Index);
> +}
> +
> +/**
> +  The function is used to append a JSON value to the end of the JSON array, and grow the size of
> +  array by 1. The reference count of this value will be increased by 1.
> +
> +  More details for reference count strategy can refer to the API description for JsonValueFree().
> +
> +  @param[in]   JsonArray              The provided JSON object.
> +  @param[in]   Json                   The JSON value to append.
> +
> +  @retval      EFI_ABORTED            Some error occur and operation aborted.
> +  @retval      EFI_SUCCESS            JSON value has been appended to the end of the JSON array.
> +
> +**/
> +EFI_STATUS
> +EFIAPI
> +JsonArrayAppendValue (
> +  IN    EDKII_JSON_ARRAY    JsonArray,
> +  IN    EDKII_JSON_VALUE    Json
> +  )
> +{
> +  if (json_array_append ((json_t *) JsonArray, (json_t *) Json) != 0) {
> +    return EFI_ABORTED;
> +  } else {
> +    return EFI_SUCCESS;
> +  }
> +}
> +
> +/**
> +  The function is used to remove a JSON value at position index, shifting the elements after index
> +  one position towards the start of the array. The reference count of this value will be decreased
> +  by 1.

These comment blocks all seem wrapped at 100 characters.
Plese rewrap at 80. The occasional overspill is fine, but this is consistent.

> +
> +  More details for reference count strategy can refer to the API description for JsonValueFree().
> +
> +  @param[in]   JsonArray              The provided JSON array.
> +  @param[in]   Index                  The Index position before removement.
> +
> +  @retval      EFI_ABORTED            Some error occur and operation aborted.
> +  @retval      EFI_SUCCESS            The JSON array has been removed at position index.
> +
> +**/
> +EFI_STATUS
> +EFIAPI
> +JsonArrayRemoveValue (
> +  IN    EDKII_JSON_ARRAY    JsonArray,
> +  IN    UINTN               Index
> +  )
> +{
> +  if (json_array_remove ((json_t *) JsonArray, Index) != 0) {
> +    return EFI_ABORTED;
> +  } else {
> +    return EFI_SUCCESS;
> +  }
> +}
> +
> +/**
> +  Dump JSON to a buffer.
> +
> +  @param[in]   JsonValue       The provided JSON array.
> +  @param[in]   Flags           The Index position before removement.
> +
> +  @retval      NULL            Dump fail if NULL returned, otherwise the buffer
> +                               contain JSON paylaod in ASCII string.
> +**/
> +CHAR8 *
> +EFIAPI
> +JsonDumpString (
> +  IN    EDKII_JSON_ARRAY    JsonValue,
> +  IN    UINTN               Flags
> +  )
> +{
> +    if (JsonValue == NULL) {
> +      return NULL;
> +    }
> +    return json_dumps((json_t *)JsonValue, Flags);
> +}
> +
> +/**
> +  Load JSON from a buffer.
> +
> +  @param[in]   Buffer        Bufffer to the JSON payload
> +  @param[in]   BufferLen     Length of the buffer
> +  @param[in]   Flags         Flag of loading JSON buffer
> +  @param[in]   Error         Pointer to error structure
> +
> +  @retval      EDKII_JSON_VALUE  NULL means fail to load JSON payload.
> +**/
> +EDKII_JSON_VALUE
> +EFIAPI
> +JsonLoadBuffer (
> +  IN    CONST CHAR8       *Buffer,
> +  IN    UINTN             BufferLen,
> +  IN    UINTN             Flags,
> +  IN    EDKII_JSON_ERROR  *Error
> +  )
> +{
> +  return json_loadb(Buffer, BufferLen, Flags, (json_error_t *)Error);
> +}
> +
> +/**
> +  Decrease reference.
> +
> +  @param[in]   JsonValue      JSON value
> +**/
> +VOID
> +EFIAPI
> +JsonDecreaseReference (
> +  IN EDKII_JSON_VALUE JsonValue
> +  )
> +{
> +  json_decref (JsonValue);
> +}
> +
> +/**
> +  Increase reference.
> +
> +  @param[in]   JsonValue      JSON value
> +  @retval      EDKII_JSON_VALUE of itself
> +**/
> +EDKII_JSON_VALUE
> +EFIAPI
> +JsonIncreaseReference (
> +  IN EDKII_JSON_VALUE JsonValue
> +  )
> +{
> +  return json_incref (JsonValue);
> +}
> +
> +/**
> +  Returns an opaque iterator which can be used to iterate over all key-value pairs
> +  in object, or NULL if object is empty.
> +
> +  @param[in]   JsonValue      JSON value
> +  @retval      Iterator pointer
> +**/
> +VOID *
> +EFIAPI
> +JsonObjectIterator (
> +  IN EDKII_JSON_VALUE JsonValue
> +  )
> +{
> +  return json_object_iter (JsonValue);
> +}
> +
> +/**
> +  Extract the associated value from iterator.
> +
> +  @param[in]   Iterator   Iterator pointer
> +  @retval      EDKII_JSON_VALUE
> +**/
> +EDKII_JSON_VALUE
> +EFIAPI
> +JsonObjectIteratorValue (
> +  IN VOID *Iterator
> +  )
> +{
> +  return json_object_iter_value(Iterator);
> +}
> +
> +/**
> +  Returns an iterator pointing to the next key-value pair in object after iter,
> +  or NULL if the whole object has been iterated through.
> +
> +  @param[in]   JsonValue  JSON value
> +  @param[in]   Iterator   Iterator pointer
> +  @retval      Iterator pointer
> +**/
> +VOID *
> +JsonObjectIteratorNext (
> +  IN EDKII_JSON_VALUE JsonValue,
> +  IN VOID             *Iterator
> +  )
> +{
> +  return json_object_iter_next(JsonValue, Iterator);
> +}
> +
> +/**
> +  Returns the json type of this json value.
> +
> +  @param[in]   JsonValue  JSON value
> +  @retval      JSON type returned
> +**/
> +EDKII_JSON_TYPE
> +EFIAPI
> +JsonGetType (
> +  IN EDKII_JSON_VALUE JsonValue
> +  )
> +{
> +  return ((json_t *)JsonValue)->type;
> +}
> diff --git a/RedfishPkg/Library/JsonLib/JsonLib.inf b/RedfishPkg/Library/JsonLib/JsonLib.inf
> new file mode 100644
> index 0000000000..16df2ae183
> --- /dev/null
> +++ b/RedfishPkg/Library/JsonLib/JsonLib.inf
> @@ -0,0 +1,103 @@
> +## @file
> +# Thirty party Jansson library for JSON operations.
> +#
> +# Copyright (c) 2019, Intel Corporation. All rights reserved.<BR>
> +# (C) Copyright 2020 Hewlett Packard Enterprise Development LP<BR>
> +#
> +#    SPDX-License-Identifier: BSD-2-Clause-Patent
> +#
> +##
> +
> +[Defines]
> +  INF_VERSION                    = 0x0001001b
> +  BASE_NAME                      = JsonLib
> +  FILE_GUID                      = F5E36815-305A-4C5A-9D75-4F2149E45255
> +  MODULE_TYPE                    = UEFI_DRIVER
> +  VERSION_STRING                 = 1.0
> +  LIBRARY_CLASS                  = JsonLib | DXE_DRIVER DXE_RUNTIME_DRIVER UEFI_APPLICATION UEFI_DRIVER
> +
> +#
> +#  VALID_ARCHITECTURES           = IA32 X64 ARM AARCH64 RISCV64
> +#
> +
> +[Sources]
> +  #
> +  # Below are the source code of third
> +  # party jansson library.
> +  #
> +  jansson/src/dump.c
> +  jansson/src/error.c
> +  jansson/src/hashtable.c
> +  jansson/src/hashtable_seed.c
> +  jansson/src/memory.c
> +  jansson/src/pack_unpack.c
> +  jansson/src/strbuffer.c
> +  jansson/src/strconv.c
> +  jansson/src/utf.c
> +  jansson/src/value.c
> +  jansson/src/version.c
> +  #
> +  # Below are the source of edk2 JsonLib.
> +  #
> +  JsonLib.c
> +  JsonUtilities.c
> +  JsonUtilities.h
> +  JanssonCrtLibSupport.c
> +  JanssonCrtLibSupport.h
> +  jansson_config.h
> +  jansson_private_config.h
> +  sys/time.h
> +  sys/types.h
> +  assert.h
> +  errno.h
> +  limits.h
> +  math.h
> +  stdarg.h
> +  stddef.h
> +  stdio.h
> +  stdlib.h
> +  string.h
> +  time.h
> +  #
> +  # Below is the source code override to fix the build issue.
> +  # Add code in load.c to conditionally use stdin according
> +  # to HAVE_UNISTD_H macro. The PR is submitted to jansson
> +  # open source community.
> +  # https://github.com/akheron/jansson/pull/558
> +  #
> +  load.c

I too have concerns over this.
I think if we *need* to include this in edk2 tree, then we *need* to
dual-license it as MIT + BSD+Patent.

> +
> +[Packages]
> +  MdePkg/MdePkg.dec
> +  MdeModulePkg/MdeModulePkg.dec
> +  RedfishPkg/RedfishPkg.dec
> +
> +[LibraryClasses]
> +  UefiLib
> +  BaseLib
> +  BaseMemoryLib
> +  MemoryAllocationLib
> +  UefiRuntimeServicesTableLib
> +  DebugLib
> +  PrintLib

Please sort classes alphabetically.

> +
> +[BuildOptions]
> +  #
> +  # Disables the following Visual Studio compiler warnings
> +  # so we do not break the build with /WX option:
> +  #   C4090: 'function' : different 'const' qualifiers
> +  #   C4244: conversion from type1 to type2, possible loss of data
> +  #   C4702: unreachable code
> +  #   C4706: assignment within conditional expression
> +  #   C4456: declaration hides previous local declaration
> +  #   C4334: 32-bit shift implicitly converted to 64-bit
> +  #   C4204: nonstandard extension used: non-constant aggregate initializer
> +  #   C4267: 'var' : conversion from 'size_t' to 'type', possible loss of data
> +  #
> +  # Define macro HAVE_CONFIG_H to include jansson_private_config.h to build.
> +  # Undefined _WIN32, WIN64, _MSC_VER macros
> +  # On GCC, no error on the unused-function and unused-but-set-variable.
> +  #
> +  MSFT:*_*_*_CC_FLAGS = /wd4204 /wd4267 /wd4702 /wd4706 /wd4244 /wd4090 /wd4456 /wd4334 /DHAVE_CONFIG_H=1 /U_WIN32 /UWIN64 /U_MSC_VER
> +  GCC:*_*_*_CC_FLAGS = -Wno-unused-function -Wno-unused-but-set-variable

Unused but set variable warning traps many real errors.
Are you finding lots of these in the upstream project?

> +
> diff --git a/RedfishPkg/Library/JsonLib/JsonUtilities.c b/RedfishPkg/Library/JsonLib/JsonUtilities.c
> new file mode 100644
> index 0000000000..f84a133219
> --- /dev/null
> +++ b/RedfishPkg/Library/JsonLib/JsonUtilities.c
> @@ -0,0 +1,417 @@
> +/** @file
> +  Utility functions for JSON operations.
> +
> +  Copyright (c) 2018 - 2019, Intel Corporation. All rights reserved.<BR>
> + (C) Copyright 2020 Hewlett Packard Enterprise Development LP<BR>
> +
> +    SPDX-License-Identifier: BSD-2-Clause-Patent
> +
> +**/
> +
> +#include "JsonUtilities.h"
> +
> +/**
> +  Since each UCS2 character can be represented by 1-3 UTF8 encoded characters,
> +  this function is used to retrieve the UTF8 encoding size for a UCS2 character.
> +
> +  @param[in]   Utf8Buffer       The buffer for UTF8 encoded data.
> +
> +  @retval      Return the size of UTF8 encoding string or 0 if it is not for
> +               UCS2 format.
> +
> +**/

At least some of these look like generically useful functions.
Consider including in MdeModulePkg?
If not, or not right away, at least give it a more appropriate generic
name and break it out as a separate library, and commit, for UCS2-UTF8
operations.

> +UINT8
> +GetUTF8SizeForUCS2 (
> +  IN    CHAR8      *Utf8Buffer
> +  )
> +{
> +  CHAR8    TempChar;
> +  UINT8    Utf8Size;
> +
> +  ASSERT (Utf8Buffer != NULL);
> +
> +  TempChar = *Utf8Buffer;
> +  if ((TempChar & 0xF0) == 0xF0) {
> +
> +    //
> +    // This format is not for UCS2.
> +    //
> +    return 0;
> +  }
> +
> +  Utf8Size = 1;
> +  if ((TempChar & 0x80) == 0x80) {
> +    if ((TempChar & 0xC0) == 0xC0) {
> +
> +      Utf8Size ++;
> +      if ((TempChar & 0xE0) == 0xE0) {
> +
> +        Utf8Size ++;
> +      }
> +    }
> +  }
> +
> +  return Utf8Size;
> +}
> +
> +/**
> +  Since each UCS2 character can be represented by the format: \uXXXX, this function
> +  is used to retrieve the UCS2 character from a Unicode format.
> +  Call MUST make sure there are at least 6 Bytes in the input UTF8 buffer.
> +
> +  @param[in]    Utf8Buffer             The buffer for UTF8 encoded data.
> +  @param[out]   Ucs2Char               The converted UCS2 character.
> +
> +  @retval       EFI_INVALID_PARAMETER  Non-Ascii characters found in the hexadecimal
> +                                       digits string, and can't be converted to a UCS2
> +                                       character.
> +  @retval       EFI_SUCCESS            The UCS2 character has been retrieved.
> +
> +**/
> +EFI_STATUS
> +GetUCS2CharByFormat (
> +  IN    CHAR8      *Utf8Buffer,
> +  OUT   CHAR16     *Ucs2Char
> +  )
> +{
> +  UINT8     Num1;
> +  UINT8     Num2;
> +  UINT8     Index;
> +  CHAR8     Ucs2CharFormat[JSON_UNICODE_FORMAT_CHAR_SIZE];  /// two Hexadecimal digits Ascii string, like "3F"
> +
> +  for (Index = 0; Index < 4; Index ++) {
> +    if ((*(Utf8Buffer + 2 + Index) & 0x80) != 0x00) {
> +      return EFI_INVALID_PARAMETER;
> +    }
> +  }
> +
> +  ZeroMem (Ucs2CharFormat, JSON_UNICODE_FORMAT_CHAR_SIZE);
> +
> +  //
> +  // Get the First Number, Offset is 2
> +  //
> +  CopyMem (Ucs2CharFormat, Utf8Buffer + 2, JSON_UNICODE_FORMAT_CHAR_LEN);
> +  Num1 = (UINT8) AsciiStrHexToUintn (Ucs2CharFormat);
> +
> +  //
> +  // Get the Second Number, Offset is 4
> +  //
> +  CopyMem (Ucs2CharFormat, Utf8Buffer + 4, JSON_UNICODE_FORMAT_CHAR_LEN);
> +  Num2 = (UINT8) AsciiStrHexToUintn (Ucs2CharFormat);
> +
> +  //
> +  // Ucs2Char is Little-Endian
> +  //
> +  *((CHAR8 *) Ucs2Char)        = Num2;
> +  *(((CHAR8 *) Ucs2Char) + 1) = Num1;
> +
> +  return EFI_SUCCESS;
> +}
> +
> +/**
> +  Convert a UCS2 character to UTF8 encoding string.
> +
> +  @param[in]    Ucs2Char               The provided UCS2 character.
> +  @param[out]   Utf8Buffer             The converted UTF8 encoded data.
> +
> +  @retval      Return the size of UTF8 encoding data for this UCS2 character.
> +
> +**/
> +UINT8
> +UCS2CharToUTF8 (
> +  IN  CHAR16     Ucs2Char,
> +  OUT CHAR8      *Utf8Buffer
> +  )
> +{
> +  UINT16    Ucs2Number;
> +
> +  ASSERT (Utf8Buffer != NULL);
> +
> +  Ucs2Number = (UINT16) Ucs2Char;
> +  if (Ucs2Number <= 0x007F) {
> +
> +    //
> +    // UTF8 format: 0xxxxxxx
> +    //
> +    *Utf8Buffer = Ucs2Char & 0x7F;
> +    return 1;
> +
> +  } else if (Ucs2Number >= 0x0080 && Ucs2Number <= 0x07FF) {
> +
> +    //
> +    // UTF8 format: 110xxxxx 10xxxxxx
> +    //
> +    *(Utf8Buffer + 1) = (Ucs2Char & 0x3F) | 0x80;
> +    *Utf8Buffer       = ((Ucs2Char >> 6) & 0x1F) | 0xC0;
> +    return 2;
> +
> +  } else {  /// Ucs2Number >= 0x0800 && Ucs2Number <= 0xFFFF
> +
> +    //
> +    // UTF8 format: 1110xxxx 10xxxxxx 10xxxxxx
> +    //
> +    *(Utf8Buffer + 2) = (Ucs2Char & 0x3F) | 0x80;
> +    *(Utf8Buffer + 1) = ((Ucs2Char >> 6) & 0x3F) | 0x80;
> +    *Utf8Buffer       = ((Ucs2Char >> 12) & 0x0F) | 0xE0;
> +    return 3;
> +  }
> +}
> +
> +/**
> +  Convert a UTF8 encoded data to a UCS2 character.
> +
> +  @param[in]    Utf8Buffer             The provided UTF8 encoded data.
> +  @param[out]   Ucs2Char               The converted UCS2 character.
> +
> +  @retval       EFI_INVALID_PARAMETER  The UTF8 encoded string is not valid or
> +                                       not for UCS2 character.
> +  @retval       EFI_SUCCESS            The converted UCS2 character.
> +
> +**/
> +EFI_STATUS
> +UTF8ToUCS2Char (
> +  IN   CHAR8      *Utf8Buffer,
> +  OUT  CHAR16     *Ucs2Char
> +  )
> +{
> +  UINT8    Utf8Size;
> +  CHAR8    *Ucs2Buffer;
> +  CHAR8    TempChar1;
> +  CHAR8    TempChar2;
> +  CHAR8    TempChar3;
> +
> +  ASSERT (Utf8Buffer != NULL && Ucs2Char != NULL);
> +  ZeroMem (Ucs2Char, sizeof (CHAR16));
> +  Ucs2Buffer = (CHAR8 *) Ucs2Char;
> +
> +  Utf8Size = GetUTF8SizeForUCS2 (Utf8Buffer);
> +  switch (Utf8Size) {
> +
> +    case 1:
> +
> +      //
> +      // UTF8 format: 0xxxxxxx
> +      //
> +      TempChar1 = *Utf8Buffer;
> +      if ((TempChar1 & 0x80) != 0x00) {
> +        return EFI_INVALID_PARAMETER;
> +      }
> +
> +      *Ucs2Buffer       = TempChar1;
> +      *(Ucs2Buffer + 1) = 0;
> +      break;
> +
> +    case 2:
> +
> +      //
> +      // UTF8 format: 110xxxxx 10xxxxxx
> +      //
> +      TempChar1 = *Utf8Buffer;
> +      if ((TempChar1 & 0xE0) != 0xC0) {
> +        return EFI_INVALID_PARAMETER;
> +      }
> +
> +      TempChar2 = *(Utf8Buffer + 1);
> +      if ((TempChar2 & 0xC0) != 0x80) {
> +        return EFI_INVALID_PARAMETER;
> +      }
> +
> +      *Ucs2Buffer       = (TempChar1 << 6) + (TempChar2 & 0x3F);
> +      *(Ucs2Buffer + 1) = (TempChar1 >> 2) & 0x07;
> +      break;
> +
> +    case 3:
> +
> +      //
> +      // UTF8 format: 1110xxxx 10xxxxxx 10xxxxxx
> +      //
> +      TempChar1 = *Utf8Buffer;
> +      if ((TempChar1 & 0xF0) != 0xE0) {
> +        return EFI_INVALID_PARAMETER;
> +      }
> +
> +      TempChar2 = *(Utf8Buffer + 1);
> +      if ((TempChar2 & 0xC0) != 0x80) {
> +        return EFI_INVALID_PARAMETER;
> +      }
> +
> +      TempChar3 = *(Utf8Buffer + 2);
> +      if ((TempChar3 & 0xC0) != 0x80) {
> +        return EFI_INVALID_PARAMETER;
> +      }
> +
> +      *Ucs2Buffer       = (TempChar2 << 6) + (TempChar3 & 0x3F);
> +      *(Ucs2Buffer + 1) = (TempChar1 << 4) + ((TempChar2 >> 2) & 0x0F);
> +
> +      break;
> +
> +    default:
> +
> +      return EFI_INVALID_PARAMETER;
> +  }
> +
> +  return EFI_SUCCESS;
> +}
> +
> +/**
> +  Convert a UCS2 string to a UTF8 encoded string.
> +
> +  @param[in]    Ucs2Str                The provided UCS2 string.
> +  @param[out]   Utf8StrAddr            The converted UTF8 string address. Caller
> +                                       is responsible for Free this string.
> +
> +  @retval       EFI_INVALID_PARAMETER  One or more parameters are invalid.
> +  @retval       EFI_OUT_OF_RESOURCES   System runs out of resources.
> +  @retval       EFI_SUCCESS            The UTF8 encoded string has been converted.
> +
> +**/
> +EFI_STATUS
> +UCS2StrToUTF8 (
> +  IN  CHAR16     *Ucs2Str,
> +  OUT CHAR8      **Utf8StrAddr
> +  )
> +{
> +  UINTN    Ucs2StrIndex;
> +  UINTN    Ucs2StrLength;
> +  CHAR8    *Utf8Str;
> +  UINTN    Utf8StrLength;
> +  UINTN    Utf8StrIndex;
> +  CHAR8    Utf8Buffer[UTF8_BUFFER_FOR_UCS2_MAX_SIZE];
> +  UINT8    Utf8BufferSize;
> +
> +  if (Ucs2Str == NULL || Utf8StrAddr == NULL) {
> +    return EFI_INVALID_PARAMETER;
> +  }
> +
> +  Ucs2StrLength = StrLen (Ucs2Str);
> +  Utf8StrLength = 0;
> +
> +  for (Ucs2StrIndex = 0; Ucs2StrIndex < Ucs2StrLength; Ucs2StrIndex ++) {
> +
> +    ZeroMem (Utf8Buffer, sizeof (Utf8Buffer));
> +    Utf8BufferSize = UCS2CharToUTF8 (Ucs2Str[Ucs2StrIndex], Utf8Buffer);
> +    Utf8StrLength += Utf8BufferSize;
> +  }
> +
> +  Utf8Str = AllocateZeroPool (Utf8StrLength + 1);
> +  if (Utf8Str == NULL) {
> +    return EFI_OUT_OF_RESOURCES;
> +  }
> +
> +  Utf8StrIndex = 0;
> +  for (Ucs2StrIndex = 0; Ucs2StrIndex < Ucs2StrLength; Ucs2StrIndex ++) {
> +
> +    ZeroMem (Utf8Buffer, sizeof (Utf8Buffer));
> +    Utf8BufferSize = UCS2CharToUTF8 (Ucs2Str[Ucs2StrIndex], Utf8Buffer);
> +
> +    CopyMem (Utf8Str + Utf8StrIndex, Utf8Buffer, Utf8BufferSize);
> +    Utf8StrIndex += Utf8BufferSize;
> +  }
> +
> +  Utf8Str[Utf8StrIndex] = '\0';
> +  *Utf8StrAddr = Utf8Str;
> +
> +  return EFI_SUCCESS;
> +}
> +
> +/**
> +  Convert a UTF8 encoded string to a UCS2 string.
> +
> +  @param[in]    Utf8Str                The provided UTF8 encoded string.
> +  @param[out]   Ucs2StrAddr            The converted UCS2 string address. Caller
> +                                       is responsible for Free this string.
> +
> +  @retval       EFI_INVALID_PARAMETER  The UTF8 encoded string is not valid to
> +                                       convert to UCS2 string.
> +                                       One or more parameters are invalid.
> +  @retval       EFI_OUT_OF_RESOURCES   System runs out of resources.
> +  @retval       EFI_SUCCESS            The UCS2 string has been converted.
> +
> +**/
> +EFI_STATUS
> +UTF8StrToUCS2 (
> +  IN  CHAR8      *Utf8Str,
> +  OUT CHAR16     **Ucs2StrAddr
> +  )
> +{
> +  EFI_STATUS    Status;
> +  UINTN         Utf8StrIndex;
> +  UINTN         Utf8StrLength;
> +  UINTN         Ucs2StrIndex;
> +  UINT8         Utf8BufferSize;
> +  CHAR16        *Ucs2StrTemp;
> +
> +  if (Utf8Str == NULL || Ucs2StrAddr == NULL) {
> +    return EFI_INVALID_PARAMETER;
> +  }
> +
> +  //
> +  // It is not an Ascii string, calculate string length.
> +  //
> +  Utf8StrLength = 0;
> +  while (*(Utf8Str + Utf8StrLength) != '\0') {
> +    Utf8StrLength ++;
> +  }
> +
> +  //
> +  // UCS2 string shall not be longer than the UTF8 string.
> +  //
> +  Ucs2StrTemp = AllocateZeroPool ((Utf8StrLength + 1) * sizeof (CHAR16));
> +  if (Ucs2StrTemp == NULL) {
> +    return EFI_OUT_OF_RESOURCES;
> +  }
> +
> +  Utf8StrIndex = 0;
> +  Ucs2StrIndex = 0;
> +  while (Utf8Str[Utf8StrIndex] != '\0') {
> +
> +    if (CompareMem (Utf8Str + Utf8StrIndex, "\\u", 2) == 0 &&
> +      Utf8StrLength - Utf8StrIndex >= JSON_UNICODE_FORMAT_LEN) {
> +
> +      Status = GetUCS2CharByFormat (Utf8Str + Utf8StrIndex, Ucs2StrTemp + Ucs2StrIndex);
> +      if (!EFI_ERROR (Status)) {
> +
> +        Utf8StrIndex += JSON_UNICODE_FORMAT_LEN;
> +        Ucs2StrIndex ++;
> +      } else {
> +
> +        StrCpyS (Ucs2StrTemp + Ucs2StrIndex, 3, L"\\u");
> +
> +        Ucs2StrIndex += 2;
> +        Utf8StrIndex += 2;
> +      }
> +    } else {
> +
> +      Utf8BufferSize = GetUTF8SizeForUCS2 (Utf8Str + Utf8StrIndex);
> +      if (Utf8BufferSize == 0 || Utf8StrLength - Utf8StrIndex < Utf8BufferSize) {
> +
> +        FreePool (Ucs2StrTemp);
> +        return EFI_INVALID_PARAMETER;
> +      }
> +
> +      Status = UTF8ToUCS2Char (Utf8Str + Utf8StrIndex, Ucs2StrTemp + Ucs2StrIndex);
> +      if (EFI_ERROR (Status)) {
> +
> +        FreePool (Ucs2StrTemp);
> +        return EFI_INVALID_PARAMETER;
> +      }
> +
> +      Ucs2StrIndex ++;
> +      Utf8StrIndex += Utf8BufferSize;
> +    }
> +  }
> +
> +  *Ucs2StrAddr = AllocateZeroPool ((Ucs2StrIndex + 1) * sizeof (CHAR16));
> +  if (*Ucs2StrAddr == NULL) {
> +
> +    FreePool (Ucs2StrTemp);
> +    return EFI_OUT_OF_RESOURCES;
> +  }
> +
> +  StrCpyS (*Ucs2StrAddr, Ucs2StrIndex + 1, Ucs2StrTemp);
> +  *(*Ucs2StrAddr + Ucs2StrIndex) = L'\0';
> +  FreePool (Ucs2StrTemp);
> +
> +  return EFI_SUCCESS;
> +}
> +
> diff --git a/RedfishPkg/Library/JsonLib/JsonUtilities.h b/RedfishPkg/Library/JsonLib/JsonUtilities.h
> new file mode 100644
> index 0000000000..1aaa4d31e2
> --- /dev/null
> +++ b/RedfishPkg/Library/JsonLib/JsonUtilities.h
> @@ -0,0 +1,69 @@
> +/** @file
> +  Utility functions for JSON operations.
> +
> +  Copyright (c) 2019, Intel Corporation. All rights reserved.<BR>
> + (C) Copyright 2020 Hewlett Packard Enterprise Development LP<BR>
> +
> +    SPDX-License-Identifier: BSD-2-Clause-Patent
> +
> +**/
> +
> +#ifndef JSON_UTILITIES_H_
> +#define JSON_UTILITIES_H_
> +
> +#include <Base.h>
> +#include <Uefi.h>
> +#include <Library/BaseLib.h>
> +#include <Library/BaseMemoryLib.h>
> +#include <Library/DebugLib.h>
> +#include <Library/PrintLib.h>
> +#include <Library/MemoryAllocationLib.h>
> +#include "jansson.h"
> +
> +#define JSON_UNICODE_FORMAT_LEN    6       ///  L"\u0000"
> +#define JSON_UNICODE_FORMAT_SIZE   7
> +
> +#define JSON_UNICODE_FORMAT_CHAR_LEN    2
> +#define JSON_UNICODE_FORMAT_CHAR_SIZE   3
> +
> +#define UTF8_BUFFER_FOR_UCS2_MAX_SIZE   3
> +
> +/**
> +  Convert a UCS2 string to a UTF8 encoded string.
> +
> +  @param[in]    Ucs2Str                The provided UCS2 string.
> +  @param[out]   Utf8StrAddr            The converted UTF8 string address. Caller
> +                                       is responsible for Free this string.
> +
> +  @retval       EFI_INVALID_PARAMETER  One or more parameters are invalid.
> +  @retval       EFI_OUT_OF_RESOURCES   System runs out of resources.
> +  @retval       EFI_SUCCESS            The UTF8 encoded string has been converted.
> +
> +**/
> +EFI_STATUS
> +UCS2StrToUTF8 (
> +  IN  CHAR16     *Ucs2Str,
> +  OUT CHAR8      **Utf8StrAddr
> +  );
> +
> +/**
> +  Convert a UTF8 encoded string to a UCS2 string.
> +
> +  @param[in]    Utf8Str                The provided UTF8 encoded string.
> +  @param[out]   Ucs2StrAddr            The converted UCS2 string address. Caller
> +                                       is responsible for Free this string.
> +
> +  @retval       EFI_INVALID_PARAMETER  The UTF8 encoded string is not valid to
> +                                       convert to UCS2 string.
> +                                       One or more parameters are invalid.
> +  @retval       EFI_OUT_OF_RESOURCES   System runs out of resources.
> +  @retval       EFI_SUCCESS            The UCS2 string has been converted.
> +
> +**/
> +EFI_STATUS
> +UTF8StrToUCS2 (
> +  IN  CHAR8      *Utf8Str,
> +  OUT CHAR16     **Ucs2StrAddr
> +  );
> +
> +#endif
> diff --git a/RedfishPkg/Library/JsonLib/Readme.txt b/RedfishPkg/Library/JsonLib/Readme.txt
> new file mode 100644
> index 0000000000..cc149196b9
> --- /dev/null
> +++ b/RedfishPkg/Library/JsonLib/Readme.txt

.rst?

/
    Leif

> @@ -0,0 +1,40 @@
> +=============================================================================
> +                             Introduction
> +=============================================================================
> +  Jansson is a C library for encoding, decoding and manipulating JSON data.
> +Its main features and design principles are:
> +
> +  - Simple and intuitive API and data model
> +  - Comprehensive documentation
> +  - No dependencies on other libraries
> +  - Full Unicode support (UTF-8)
> +  - Extensive test suite
> +
> +  Jansson is licensed under the MIT license(refer to ReadMe.rst under edk2).
> +It is used in production and its API is stable. It works on numerous
> +platforms, including numerous Unix like systems and Windows. It's suitable
> +for use on any system, including desktop, server, and small embedded systems.
> +
> +  In UEFI/EDKII environment, Redfish project consumes jansson to achieve JSON
> +operations.
> +
> +* Jansson version on edk2: 2.13.1
> +
> +* EDKII jansson library wrapper:
> +   - JsonLib.h:
> +     This is the denifitions of EDKII JSON APIs which are mapped to
> +     jannson funcitons accordingly.
> +
> +   - JanssonJsonLibMapping.h:
> +     This is the wrapper to map funcitons and definitions used in
> +     native jannson applications to edk2 JsonLib. This avoids the
> +     modifications on native jannson applications to be built under
> +     edk2 environment.
> +
> +*Known issue:
> +   Build fail with jansson/src/load.c, add code in load.c to conditionally
> +   use stdin according to HAVE_UNISTD_H macro. The PR is submitted to
> +   jansson open source community.
> +   https://github.com/akheron/jansson/pull/558
> +
> +
> diff --git a/RedfishPkg/Library/JsonLib/assert.h b/RedfishPkg/Library/JsonLib/assert.h
> new file mode 100644
> index 0000000000..8f9eb748e4
> --- /dev/null
> +++ b/RedfishPkg/Library/JsonLib/assert.h
> @@ -0,0 +1,16 @@
> +/** @file
> +  Include file to support building the third-party jansson library.
> +
> + Copyright (c) 2019, Intel Corporation. All rights reserved.<BR>
> + (C) Copyright 2020 Hewlett Packard Enterprise Development LP<BR>
> +
> +    SPDX-License-Identifier: BSD-2-Clause-Patent
> +
> +**/
> +
> +#ifndef JANSSON_CRT_ASSERT_H_
> +#define JANSSON_CRT_ASSERT_H_
> +
> +#include <JanssonCrtLibSupport.h>
> +
> +#endif
> diff --git a/RedfishPkg/Library/JsonLib/errno.h b/RedfishPkg/Library/JsonLib/errno.h
> new file mode 100644
> index 0000000000..b1191b225a
> --- /dev/null
> +++ b/RedfishPkg/Library/JsonLib/errno.h
> @@ -0,0 +1,16 @@
> +/** @file
> +  Include file to support building the third-party jansson library.
> +
> + Copyright (c) 2019, Intel Corporation. All rights reserved.<BR>
> + (C) Copyright 2020 Hewlett Packard Enterprise Development LP<BR>
> +
> +    SPDX-License-Identifier: BSD-2-Clause-Patent
> +
> +**/
> +
> +#ifndef JANSSON_CRT_ERRNO_H_
> +#define JANSSON_CRT_ERRNO_H_
> +
> +#include <JanssonCrtLibSupport.h>
> +
> +#endif
> diff --git a/RedfishPkg/Library/JsonLib/jansson_config.h b/RedfishPkg/Library/JsonLib/jansson_config.h
> new file mode 100644
> index 0000000000..6b154289df
> --- /dev/null
> +++ b/RedfishPkg/Library/JsonLib/jansson_config.h
> @@ -0,0 +1,60 @@
> +/** @file
> + * Copyright (c) 2010-2016 Petri Lehtinen <petri@digip.org>
> + *
> + * Jansson is free software; you can redistribute it and/or modify
> + * it under the terms of the MIT license. See LICENSE for details.
> + *
> + *
> + * This file specifies a part of the site-specific configuration for
> + * Jansson, namely those things that affect the public API in
> + * jansson.h.
> + *
> + * The configure script copies this file to jansson_config.h and
> + * replaces @var@ substitutions by values that fit your system. If you
> + * cannot run the configure script, you can do the value substitution
> + * by hand.
> +
> + jansson open source license,
> + https://github.com/akheron/jansson/blob/master/LICENSE
> +
> + (C) Copyright 2020 Hewlett Packard Enterprise Development LP<BR>
> +
> +    SPDX-License-Identifier: BSD-2-Clause-Patent
> + **/
> +
> +#ifndef JANSSON_CONFIG_H_
> +#define JANSSON_CONFIG_H_
> +
> +/* If your compiler supports the inline keyword in C, JSON_INLINE is
> +   defined to `inline', otherwise empty. In C++, the inline is always
> +   supported. */
> +#ifdef __cplusplus
> +#define JSON_INLINE inline
> +#else
> +#define JSON_INLINE
> +#endif
> +
> +/* If your compiler supports the `long long` type and the strtoll()
> +   library function, JSON_INTEGER_IS_LONG_LONG is defined to 1,
> +   otherwise to 0. */
> +#define JSON_INTEGER_IS_LONG_LONG 1
> +
> +/* If locale.h and localeconv() are available, define to 1,
> +   otherwise to 0. */
> +#define JSON_HAVE_LOCALECONV 0
> +
> +/* If __atomic builtins are available they will be used to manage
> +   reference counts of json_t. */
> +#define JSON_HAVE_ATOMIC_BUILTINS 0
> +
> +/* If __atomic builtins are not available we try using __sync builtins
> +   to manage reference counts of json_t. */
> +#define JSON_HAVE_SYNC_BUILTINS 0
> +
> +/* Maximum recursion depth for parsing JSON input.
> +   This limits the depth of e.g. array-within-array constructions. */
> +#define JSON_PARSER_MAX_DEPTH 2048
> +
> +#define SUPPORT_JANSSON_JSON_REAL 1
> +
> +#endif
> diff --git a/RedfishPkg/Library/JsonLib/jansson_private_config.h b/RedfishPkg/Library/JsonLib/jansson_private_config.h
> new file mode 100644
> index 0000000000..268f91ef8a
> --- /dev/null
> +++ b/RedfishPkg/Library/JsonLib/jansson_private_config.h
> @@ -0,0 +1,19 @@
> +/** @file
> +  Jansson private configurations for UEFI support.
> +
> + Copyright (c) 2019, Intel Corporation. All rights reserved.<BR>
> + (C) Copyright 2020 Hewlett Packard Enterprise Development LP<BR>
> +
> +    SPDX-License-Identifier: BSD-2-Clause-Patent
> +
> +**/
> +
> +#ifndef JANSSON_PRIVATE_CONFIG_H_
> +#define JANSSON_PRIVATE_CONFIG_H_
> +
> +#define HAVE_SYS_TIME_H 1
> +#define HAVE_SYS_TYPES_H 1
> +
> +#define INITIAL_HASHTABLE_ORDER 3
> +
> +#endif
> diff --git a/RedfishPkg/Library/JsonLib/limits.h b/RedfishPkg/Library/JsonLib/limits.h
> new file mode 100644
> index 0000000000..1a544adece
> --- /dev/null
> +++ b/RedfishPkg/Library/JsonLib/limits.h
> @@ -0,0 +1,16 @@
> +/** @file
> +  Include file to support building the third-party jansson library.
> +
> + Copyright (c) 2019, Intel Corporation. All rights reserved.<BR>
> + (C) Copyright 2020 Hewlett Packard Enterprise Development LP<BR>
> +
> +    SPDX-License-Identifier: BSD-2-Clause-Patent
> +
> +**/
> +
> +#ifndef JANSSON_CRT_LIMITS_H_
> +#define JANSSON_CRT_LIMITS_H_
> +
> +#include <JanssonCrtLibSupport.h>
> +
> +#endif
> diff --git a/RedfishPkg/Library/JsonLib/load.c b/RedfishPkg/Library/JsonLib/load.c
> new file mode 100644
> index 0000000000..92063e63cb
> --- /dev/null
> +++ b/RedfishPkg/Library/JsonLib/load.c
> @@ -0,0 +1,1111 @@
> +/*
> + * Copyright (c) 2009-2016 Petri Lehtinen <petri@digip.org>
> + *
> + * Jansson is free software; you can redistribute it and/or modify
> + * it under the terms of the MIT license. See LICENSE for details.
> +
> + (C) Copyright 2020 Hewlett Packard Enterprise Development LP<BR>
> +
> +    SPDX-License-Identifier: BSD-2-Clause-Patent
> + */
> +
> +#ifndef _GNU_SOURCE
> +#define _GNU_SOURCE
> +#endif
> +
> +#include "jansson_private.h"
> +
> +#include <assert.h>
> +#include <errno.h>
> +#include <limits.h>
> +#include <stdio.h>
> +#include <stdlib.h>
> +#include <string.h>
> +#ifdef HAVE_UNISTD_H
> +#include <unistd.h>
> +#endif
> +
> +#include "jansson.h"
> +#include "strbuffer.h"
> +#include "utf.h"
> +
> +#define STREAM_STATE_OK    0
> +#define STREAM_STATE_EOF   -1
> +#define STREAM_STATE_ERROR -2
> +
> +#define TOKEN_INVALID -1
> +#define TOKEN_EOF     0
> +#define TOKEN_STRING  256
> +#define TOKEN_INTEGER 257
> +#define TOKEN_REAL    258
> +#define TOKEN_TRUE    259
> +#define TOKEN_FALSE   260
> +#define TOKEN_NULL    261
> +
> +/* Locale independent versions of isxxx() functions */
> +#define l_isupper(c) ('A' <= (c) && (c) <= 'Z')
> +#define l_islower(c) ('a' <= (c) && (c) <= 'z')
> +#define l_isalpha(c) (l_isupper(c) || l_islower(c))
> +#define l_isdigit(c) ('0' <= (c) && (c) <= '9')
> +#define l_isxdigit(c)                                                                    \
> +    (l_isdigit(c) || ('A' <= (c) && (c) <= 'F') || ('a' <= (c) && (c) <= 'f'))
> +
> +/* Read one byte from stream, convert to unsigned char, then int, and
> +   return. return EOF on end of file. This corresponds to the
> +   behaviour of fgetc(). */
> +typedef int (*get_func)(void *data);
> +
> +typedef struct {
> +    get_func get;
> +    void *data;
> +    char buffer[5];
> +    size_t buffer_pos;
> +    int state;
> +    int line;
> +    int column, last_column;
> +    size_t position;
> +} stream_t;
> +
> +typedef struct {
> +    stream_t stream;
> +    strbuffer_t saved_text;
> +    size_t flags;
> +    size_t depth;
> +    int token;
> +    union {
> +        struct {
> +            char *val;
> +            size_t len;
> +        } string;
> +        json_int_t integer;
> +        double real;
> +    } value;
> +} lex_t;
> +
> +#define stream_to_lex(stream) container_of(stream, lex_t, stream)
> +
> +/*** error reporting ***/
> +
> +static void error_set(json_error_t *error, const lex_t *lex, enum json_error_code code,
> +                      const char *msg, ...) {
> +    va_list ap;
> +    char msg_text[JSON_ERROR_TEXT_LENGTH];
> +    char msg_with_context[JSON_ERROR_TEXT_LENGTH];
> +
> +    int line = -1, col = -1;
> +    size_t pos = 0;
> +    const char *result = msg_text;
> +
> +    if (!error)
> +        return;
> +
> +    va_start(ap, msg);
> +    vsnprintf(msg_text, JSON_ERROR_TEXT_LENGTH, msg, ap);
> +    msg_text[JSON_ERROR_TEXT_LENGTH - 1] = '\0';
> +    va_end(ap);
> +
> +    if (lex) {
> +        const char *saved_text = strbuffer_value(&lex->saved_text);
> +
> +        line = lex->stream.line;
> +        col = lex->stream.column;
> +        pos = lex->stream.position;
> +
> +        if (saved_text && saved_text[0]) {
> +            if (lex->saved_text.length <= 20) {
> +                snprintf(msg_with_context, JSON_ERROR_TEXT_LENGTH, "%s near '%s'",
> +                         msg_text, saved_text);
> +                msg_with_context[JSON_ERROR_TEXT_LENGTH - 1] = '\0';
> +                result = msg_with_context;
> +            }
> +        } else {
> +            if (code == json_error_invalid_syntax) {
> +                /* More specific error code for premature end of file. */
> +                code = json_error_premature_end_of_input;
> +            }
> +            if (lex->stream.state == STREAM_STATE_ERROR) {
> +                /* No context for UTF-8 decoding errors */
> +                result = msg_text;
> +            } else {
> +                snprintf(msg_with_context, JSON_ERROR_TEXT_LENGTH, "%s near end of file",
> +                         msg_text);
> +                msg_with_context[JSON_ERROR_TEXT_LENGTH - 1] = '\0';
> +                result = msg_with_context;
> +            }
> +        }
> +    }
> +
> +    jsonp_error_set(error, line, col, pos, code, "%s", result);
> +}
> +
> +/*** lexical analyzer ***/
> +
> +static void stream_init(stream_t *stream, get_func get, void *data) {
> +    stream->get = get;
> +    stream->data = data;
> +    stream->buffer[0] = '\0';
> +    stream->buffer_pos = 0;
> +
> +    stream->state = STREAM_STATE_OK;
> +    stream->line = 1;
> +    stream->column = 0;
> +    stream->position = 0;
> +}
> +
> +static int stream_get(stream_t *stream, json_error_t *error) {
> +    int c;
> +
> +    if (stream->state != STREAM_STATE_OK)
> +        return stream->state;
> +
> +    if (!stream->buffer[stream->buffer_pos]) {
> +        c = stream->get(stream->data);
> +        if (c == EOF) {
> +            stream->state = STREAM_STATE_EOF;
> +            return STREAM_STATE_EOF;
> +        }
> +
> +        stream->buffer[0] = c;
> +        stream->buffer_pos = 0;
> +
> +        if (0x80 <= c && c <= 0xFF) {
> +            /* multi-byte UTF-8 sequence */
> +            size_t i, count;
> +
> +            count = utf8_check_first(c);
> +            if (!count)
> +                goto out;
> +
> +            assert(count >= 2);
> +
> +            for (i = 1; i < count; i++)
> +                stream->buffer[i] = stream->get(stream->data);
> +
> +            if (!utf8_check_full(stream->buffer, count, NULL))
> +                goto out;
> +
> +            stream->buffer[count] = '\0';
> +        } else
> +            stream->buffer[1] = '\0';
> +    }
> +
> +    c = stream->buffer[stream->buffer_pos++];
> +
> +    stream->position++;
> +    if (c == '\n') {
> +        stream->line++;
> +        stream->last_column = stream->column;
> +        stream->column = 0;
> +    } else if (utf8_check_first(c)) {
> +        /* track the Unicode character column, so increment only if
> +           this is the first character of a UTF-8 sequence */
> +        stream->column++;
> +    }
> +
> +    return c;
> +
> +out:
> +    stream->state = STREAM_STATE_ERROR;
> +    error_set(error, stream_to_lex(stream), json_error_invalid_utf8,
> +              "unable to decode byte 0x%x", c);
> +    return STREAM_STATE_ERROR;
> +}
> +
> +static void stream_unget(stream_t *stream, int c) {
> +    if (c == STREAM_STATE_EOF || c == STREAM_STATE_ERROR)
> +        return;
> +
> +    stream->position--;
> +    if (c == '\n') {
> +        stream->line--;
> +        stream->column = stream->last_column;
> +    } else if (utf8_check_first(c))
> +        stream->column--;
> +
> +    assert(stream->buffer_pos > 0);
> +    stream->buffer_pos--;
> +    assert(stream->buffer[stream->buffer_pos] == c);
> +}
> +
> +static int lex_get(lex_t *lex, json_error_t *error) {
> +    return stream_get(&lex->stream, error);
> +}
> +
> +static void lex_save(lex_t *lex, int c) { strbuffer_append_byte(&lex->saved_text, c); }
> +
> +static int lex_get_save(lex_t *lex, json_error_t *error) {
> +    int c = stream_get(&lex->stream, error);
> +    if (c != STREAM_STATE_EOF && c != STREAM_STATE_ERROR)
> +        lex_save(lex, c);
> +    return c;
> +}
> +
> +static void lex_unget(lex_t *lex, int c) { stream_unget(&lex->stream, c); }
> +
> +static void lex_unget_unsave(lex_t *lex, int c) {
> +    if (c != STREAM_STATE_EOF && c != STREAM_STATE_ERROR) {
> +/* Since we treat warnings as errors, when assertions are turned
> + * off the "d" variable would be set but never used. Which is
> + * treated as an error by GCC.
> + */
> +#ifndef NDEBUG
> +        char d;
> +#endif
> +        stream_unget(&lex->stream, c);
> +#ifndef NDEBUG
> +        d =
> +#endif
> +            strbuffer_pop(&lex->saved_text);
> +        assert(c == d);
> +    }
> +}
> +
> +static void lex_save_cached(lex_t *lex) {
> +    while (lex->stream.buffer[lex->stream.buffer_pos] != '\0') {
> +        lex_save(lex, lex->stream.buffer[lex->stream.buffer_pos]);
> +        lex->stream.buffer_pos++;
> +        lex->stream.position++;
> +    }
> +}
> +
> +static void lex_free_string(lex_t *lex) {
> +    jsonp_free(lex->value.string.val);
> +    lex->value.string.val = NULL;
> +    lex->value.string.len = 0;
> +}
> +
> +/* assumes that str points to 'u' plus at least 4 valid hex digits */
> +static int32_t decode_unicode_escape(const char *str) {
> +    int i;
> +    int32_t value = 0;
> +
> +    assert(str[0] == 'u');
> +
> +    for (i = 1; i <= 4; i++) {
> +        char c = str[i];
> +        value <<= 4;
> +        if (l_isdigit(c))
> +            value += c - '0';
> +        else if (l_islower(c))
> +            value += c - 'a' + 10;
> +        else if (l_isupper(c))
> +            value += c - 'A' + 10;
> +        else
> +            return -1;
> +    }
> +
> +    return value;
> +}
> +
> +static void lex_scan_string(lex_t *lex, json_error_t *error) {
> +    int c;
> +    const char *p;
> +    char *t;
> +    int i;
> +
> +    lex->value.string.val = NULL;
> +    lex->token = TOKEN_INVALID;
> +
> +    c = lex_get_save(lex, error);
> +
> +    while (c != '"') {
> +        if (c == STREAM_STATE_ERROR)
> +            goto out;
> +
> +        else if (c == STREAM_STATE_EOF) {
> +            error_set(error, lex, json_error_premature_end_of_input,
> +                      "premature end of input");
> +            goto out;
> +        }
> +
> +        else if (0 <= c && c <= 0x1F) {
> +            /* control character */
> +            lex_unget_unsave(lex, c);
> +            if (c == '\n')
> +                error_set(error, lex, json_error_invalid_syntax, "unexpected newline");
> +            else
> +                error_set(error, lex, json_error_invalid_syntax, "control character 0x%x",
> +                          c);
> +            goto out;
> +        }
> +
> +        else if (c == '\\') {
> +            c = lex_get_save(lex, error);
> +            if (c == 'u') {
> +                c = lex_get_save(lex, error);
> +                for (i = 0; i < 4; i++) {
> +                    if (!l_isxdigit(c)) {
> +                        error_set(error, lex, json_error_invalid_syntax,
> +                                  "invalid escape");
> +                        goto out;
> +                    }
> +                    c = lex_get_save(lex, error);
> +                }
> +            } else if (c == '"' || c == '\\' || c == '/' || c == 'b' || c == 'f' ||
> +                       c == 'n' || c == 'r' || c == 't')
> +                c = lex_get_save(lex, error);
> +            else {
> +                error_set(error, lex, json_error_invalid_syntax, "invalid escape");
> +                goto out;
> +            }
> +        } else
> +            c = lex_get_save(lex, error);
> +    }
> +
> +    /* the actual value is at most of the same length as the source
> +       string, because:
> +         - shortcut escapes (e.g. "\t") (length 2) are converted to 1 byte
> +         - a single \uXXXX escape (length 6) is converted to at most 3 bytes
> +         - two \uXXXX escapes (length 12) forming an UTF-16 surrogate pair
> +           are converted to 4 bytes
> +    */
> +    t = jsonp_malloc(lex->saved_text.length + 1);
> +    if (!t) {
> +        /* this is not very nice, since TOKEN_INVALID is returned */
> +        goto out;
> +    }
> +    lex->value.string.val = t;
> +
> +    /* + 1 to skip the " */
> +    p = strbuffer_value(&lex->saved_text) + 1;
> +
> +    while (*p != '"') {
> +        if (*p == '\\') {
> +            p++;
> +            if (*p == 'u') {
> +                size_t length;
> +                int32_t value;
> +
> +                value = decode_unicode_escape(p);
> +                if (value < 0) {
> +                    error_set(error, lex, json_error_invalid_syntax,
> +                              "invalid Unicode escape '%.6s'", p - 1);
> +                    goto out;
> +                }
> +                p += 5;
> +
> +                if (0xD800 <= value && value <= 0xDBFF) {
> +                    /* surrogate pair */
> +                    if (*p == '\\' && *(p + 1) == 'u') {
> +                        int32_t value2 = decode_unicode_escape(++p);
> +                        if (value2 < 0) {
> +                            error_set(error, lex, json_error_invalid_syntax,
> +                                      "invalid Unicode escape '%.6s'", p - 1);
> +                            goto out;
> +                        }
> +                        p += 5;
> +
> +                        if (0xDC00 <= value2 && value2 <= 0xDFFF) {
> +                            /* valid second surrogate */
> +                            value =
> +                                ((value - 0xD800) << 10) + (value2 - 0xDC00) + 0x10000;
> +                        } else {
> +                            /* invalid second surrogate */
> +                            error_set(error, lex, json_error_invalid_syntax,
> +                                      "invalid Unicode '\\u%04X\\u%04X'", value, value2);
> +                            goto out;
> +                        }
> +                    } else {
> +                        /* no second surrogate */
> +                        error_set(error, lex, json_error_invalid_syntax,
> +                                  "invalid Unicode '\\u%04X'", value);
> +                        goto out;
> +                    }
> +                } else if (0xDC00 <= value && value <= 0xDFFF) {
> +                    error_set(error, lex, json_error_invalid_syntax,
> +                              "invalid Unicode '\\u%04X'", value);
> +                    goto out;
> +                }
> +
> +                if (utf8_encode(value, t, &length))
> +                    assert(0);
> +                t += length;
> +            } else {
> +                switch (*p) {
> +                    case '"':
> +                    case '\\':
> +                    case '/':
> +                        *t = *p;
> +                        break;
> +                    case 'b':
> +                        *t = '\b';
> +                        break;
> +                    case 'f':
> +                        *t = '\f';
> +                        break;
> +                    case 'n':
> +                        *t = '\n';
> +                        break;
> +                    case 'r':
> +                        *t = '\r';
> +                        break;
> +                    case 't':
> +                        *t = '\t';
> +                        break;
> +                    default:
> +                        assert(0);
> +                }
> +                t++;
> +                p++;
> +            }
> +        } else
> +            *(t++) = *(p++);
> +    }
> +    *t = '\0';
> +    lex->value.string.len = t - lex->value.string.val;
> +    lex->token = TOKEN_STRING;
> +    return;
> +
> +out:
> +    lex_free_string(lex);
> +}
> +
> +#ifndef JANSSON_USING_CMAKE /* disabled if using cmake */
> +#if JSON_INTEGER_IS_LONG_LONG
> +#ifdef _MSC_VER /* Microsoft Visual Studio */
> +#define json_strtoint _strtoi64
> +#else
> +#define json_strtoint strtoll
> +#endif
> +#else
> +#define json_strtoint strtol
> +#endif
> +#endif
> +
> +static int lex_scan_number(lex_t *lex, int c, json_error_t *error) {
> +    const char *saved_text;
> +    char *end;
> +    double doubleval;
> +
> +    lex->token = TOKEN_INVALID;
> +
> +    if (c == '-')
> +        c = lex_get_save(lex, error);
> +
> +    if (c == '0') {
> +        c = lex_get_save(lex, error);
> +        if (l_isdigit(c)) {
> +            lex_unget_unsave(lex, c);
> +            goto out;
> +        }
> +    } else if (l_isdigit(c)) {
> +        do
> +            c = lex_get_save(lex, error);
> +        while (l_isdigit(c));
> +    } else {
> +        lex_unget_unsave(lex, c);
> +        goto out;
> +    }
> +
> +    if (!(lex->flags & JSON_DECODE_INT_AS_REAL) && c != '.' && c != 'E' && c != 'e') {
> +        json_int_t intval;
> +
> +        lex_unget_unsave(lex, c);
> +
> +        saved_text = strbuffer_value(&lex->saved_text);
> +
> +        errno = 0;
> +        intval = json_strtoint(saved_text, &end, 10);
> +        if (errno == ERANGE) {
> +            if (intval < 0)
> +                error_set(error, lex, json_error_numeric_overflow,
> +                          "too big negative integer");
> +            else
> +                error_set(error, lex, json_error_numeric_overflow, "too big integer");
> +            goto out;
> +        }
> +
> +        assert(end == saved_text + lex->saved_text.length);
> +
> +        lex->token = TOKEN_INTEGER;
> +        lex->value.integer = intval;
> +        return 0;
> +    }
> +
> +    if (c == '.') {
> +        c = lex_get(lex, error);
> +        if (!l_isdigit(c)) {
> +            lex_unget(lex, c);
> +            goto out;
> +        }
> +        lex_save(lex, c);
> +
> +        do
> +            c = lex_get_save(lex, error);
> +        while (l_isdigit(c));
> +    }
> +
> +    if (c == 'E' || c == 'e') {
> +        c = lex_get_save(lex, error);
> +        if (c == '+' || c == '-')
> +            c = lex_get_save(lex, error);
> +
> +        if (!l_isdigit(c)) {
> +            lex_unget_unsave(lex, c);
> +            goto out;
> +        }
> +
> +        do
> +            c = lex_get_save(lex, error);
> +        while (l_isdigit(c));
> +    }
> +
> +    lex_unget_unsave(lex, c);
> +
> +    if (jsonp_strtod(&lex->saved_text, &doubleval)) {
> +        error_set(error, lex, json_error_numeric_overflow, "real number overflow");
> +        goto out;
> +    }
> +
> +    lex->token = TOKEN_REAL;
> +    lex->value.real = doubleval;
> +    return 0;
> +
> +out:
> +    return -1;
> +}
> +
> +static int lex_scan(lex_t *lex, json_error_t *error) {
> +    int c;
> +
> +    strbuffer_clear(&lex->saved_text);
> +
> +    if (lex->token == TOKEN_STRING)
> +        lex_free_string(lex);
> +
> +    do
> +        c = lex_get(lex, error);
> +    while (c == ' ' || c == '\t' || c == '\n' || c == '\r');
> +
> +    if (c == STREAM_STATE_EOF) {
> +        lex->token = TOKEN_EOF;
> +        goto out;
> +    }
> +
> +    if (c == STREAM_STATE_ERROR) {
> +        lex->token = TOKEN_INVALID;
> +        goto out;
> +    }
> +
> +    lex_save(lex, c);
> +
> +    if (c == '{' || c == '}' || c == '[' || c == ']' || c == ':' || c == ',')
> +        lex->token = c;
> +
> +    else if (c == '"')
> +        lex_scan_string(lex, error);
> +
> +    else if (l_isdigit(c) || c == '-') {
> +        if (lex_scan_number(lex, c, error))
> +            goto out;
> +    }
> +
> +    else if (l_isalpha(c)) {
> +        /* eat up the whole identifier for clearer error messages */
> +        const char *saved_text;
> +
> +        do
> +            c = lex_get_save(lex, error);
> +        while (l_isalpha(c));
> +        lex_unget_unsave(lex, c);
> +
> +        saved_text = strbuffer_value(&lex->saved_text);
> +
> +        if (strcmp(saved_text, "true") == 0)
> +            lex->token = TOKEN_TRUE;
> +        else if (strcmp(saved_text, "false") == 0)
> +            lex->token = TOKEN_FALSE;
> +        else if (strcmp(saved_text, "null") == 0)
> +            lex->token = TOKEN_NULL;
> +        else
> +            lex->token = TOKEN_INVALID;
> +    }
> +
> +    else {
> +        /* save the rest of the input UTF-8 sequence to get an error
> +           message of valid UTF-8 */
> +        lex_save_cached(lex);
> +        lex->token = TOKEN_INVALID;
> +    }
> +
> +out:
> +    return lex->token;
> +}
> +
> +static char *lex_steal_string(lex_t *lex, size_t *out_len) {
> +    char *result = NULL;
> +    if (lex->token == TOKEN_STRING) {
> +        result = lex->value.string.val;
> +        *out_len = lex->value.string.len;
> +        lex->value.string.val = NULL;
> +        lex->value.string.len = 0;
> +    }
> +    return result;
> +}
> +
> +static int lex_init(lex_t *lex, get_func get, size_t flags, void *data) {
> +    stream_init(&lex->stream, get, data);
> +    if (strbuffer_init(&lex->saved_text))
> +        return -1;
> +
> +    lex->flags = flags;
> +    lex->token = TOKEN_INVALID;
> +    return 0;
> +}
> +
> +static void lex_close(lex_t *lex) {
> +    if (lex->token == TOKEN_STRING)
> +        lex_free_string(lex);
> +    strbuffer_close(&lex->saved_text);
> +}
> +
> +/*** parser ***/
> +
> +static json_t *parse_value(lex_t *lex, size_t flags, json_error_t *error);
> +
> +static json_t *parse_object(lex_t *lex, size_t flags, json_error_t *error) {
> +    json_t *object = json_object();
> +    if (!object)
> +        return NULL;
> +
> +    lex_scan(lex, error);
> +    if (lex->token == '}')
> +        return object;
> +
> +    while (1) {
> +        char *key;
> +        size_t len;
> +        json_t *value;
> +
> +        if (lex->token != TOKEN_STRING) {
> +            error_set(error, lex, json_error_invalid_syntax, "string or '}' expected");
> +            goto error;
> +        }
> +
> +        key = lex_steal_string(lex, &len);
> +        if (!key)
> +            return NULL;
> +        if (memchr(key, '\0', len)) {
> +            jsonp_free(key);
> +            error_set(error, lex, json_error_null_byte_in_key,
> +                      "NUL byte in object key not supported");
> +            goto error;
> +        }
> +
> +        if (flags & JSON_REJECT_DUPLICATES) {
> +            if (json_object_get(object, key)) {
> +                jsonp_free(key);
> +                error_set(error, lex, json_error_duplicate_key, "duplicate object key");
> +                goto error;
> +            }
> +        }
> +
> +        lex_scan(lex, error);
> +        if (lex->token != ':') {
> +            jsonp_free(key);
> +            error_set(error, lex, json_error_invalid_syntax, "':' expected");
> +            goto error;
> +        }
> +
> +        lex_scan(lex, error);
> +        value = parse_value(lex, flags, error);
> +        if (!value) {
> +            jsonp_free(key);
> +            goto error;
> +        }
> +
> +        if (json_object_set_new_nocheck(object, key, value)) {
> +            jsonp_free(key);
> +            goto error;
> +        }
> +
> +        jsonp_free(key);
> +
> +        lex_scan(lex, error);
> +        if (lex->token != ',')
> +            break;
> +
> +        lex_scan(lex, error);
> +    }
> +
> +    if (lex->token != '}') {
> +        error_set(error, lex, json_error_invalid_syntax, "'}' expected");
> +        goto error;
> +    }
> +
> +    return object;
> +
> +error:
> +    json_decref(object);
> +    return NULL;
> +}
> +
> +static json_t *parse_array(lex_t *lex, size_t flags, json_error_t *error) {
> +    json_t *array = json_array();
> +    if (!array)
> +        return NULL;
> +
> +    lex_scan(lex, error);
> +    if (lex->token == ']')
> +        return array;
> +
> +    while (lex->token) {
> +        json_t *elem = parse_value(lex, flags, error);
> +        if (!elem)
> +            goto error;
> +
> +        if (json_array_append_new(array, elem)) {
> +            goto error;
> +        }
> +
> +        lex_scan(lex, error);
> +        if (lex->token != ',')
> +            break;
> +
> +        lex_scan(lex, error);
> +    }
> +
> +    if (lex->token != ']') {
> +        error_set(error, lex, json_error_invalid_syntax, "']' expected");
> +        goto error;
> +    }
> +
> +    return array;
> +
> +error:
> +    json_decref(array);
> +    return NULL;
> +}
> +
> +static json_t *parse_value(lex_t *lex, size_t flags, json_error_t *error) {
> +    json_t *json;
> +
> +    lex->depth++;
> +    if (lex->depth > JSON_PARSER_MAX_DEPTH) {
> +        error_set(error, lex, json_error_stack_overflow, "maximum parsing depth reached");
> +        return NULL;
> +    }
> +
> +    switch (lex->token) {
> +        case TOKEN_STRING: {
> +            const char *value = lex->value.string.val;
> +            size_t len = lex->value.string.len;
> +
> +            if (!(flags & JSON_ALLOW_NUL)) {
> +                if (memchr(value, '\0', len)) {
> +                    error_set(error, lex, json_error_null_character,
> +                              "\\u0000 is not allowed without JSON_ALLOW_NUL");
> +                    return NULL;
> +                }
> +            }
> +
> +            json = jsonp_stringn_nocheck_own(value, len);
> +            lex->value.string.val = NULL;
> +            lex->value.string.len = 0;
> +            break;
> +        }
> +
> +        case TOKEN_INTEGER: {
> +            json = json_integer(lex->value.integer);
> +            break;
> +        }
> +
> +        case TOKEN_REAL: {
> +            json = json_real(lex->value.real);
> +            break;
> +        }
> +
> +        case TOKEN_TRUE:
> +            json = json_true();
> +            break;
> +
> +        case TOKEN_FALSE:
> +            json = json_false();
> +            break;
> +
> +        case TOKEN_NULL:
> +            json = json_null();
> +            break;
> +
> +        case '{':
> +            json = parse_object(lex, flags, error);
> +            break;
> +
> +        case '[':
> +            json = parse_array(lex, flags, error);
> +            break;
> +
> +        case TOKEN_INVALID:
> +            error_set(error, lex, json_error_invalid_syntax, "invalid token");
> +            return NULL;
> +
> +        default:
> +            error_set(error, lex, json_error_invalid_syntax, "unexpected token");
> +            return NULL;
> +    }
> +
> +    if (!json)
> +        return NULL;
> +
> +    lex->depth--;
> +    return json;
> +}
> +
> +static json_t *parse_json(lex_t *lex, size_t flags, json_error_t *error) {
> +    json_t *result;
> +
> +    lex->depth = 0;
> +
> +    lex_scan(lex, error);
> +    if (!(flags & JSON_DECODE_ANY)) {
> +        if (lex->token != '[' && lex->token != '{') {
> +            error_set(error, lex, json_error_invalid_syntax, "'[' or '{' expected");
> +            return NULL;
> +        }
> +    }
> +
> +    result = parse_value(lex, flags, error);
> +    if (!result)
> +        return NULL;
> +
> +    if (!(flags & JSON_DISABLE_EOF_CHECK)) {
> +        lex_scan(lex, error);
> +        if (lex->token != TOKEN_EOF) {
> +            error_set(error, lex, json_error_end_of_input_expected,
> +                      "end of file expected");
> +            json_decref(result);
> +            return NULL;
> +        }
> +    }
> +
> +    if (error) {
> +        /* Save the position even though there was no error */
> +        error->position = (int)lex->stream.position;
> +    }
> +
> +    return result;
> +}
> +
> +typedef struct {
> +    const char *data;
> +    size_t pos;
> +} string_data_t;
> +
> +static int string_get(void *data) {
> +    char c;
> +    string_data_t *stream = (string_data_t *)data;
> +    c = stream->data[stream->pos];
> +    if (c == '\0')
> +        return EOF;
> +    else {
> +        stream->pos++;
> +        return (unsigned char)c;
> +    }
> +}
> +
> +json_t *json_loads(const char *string, size_t flags, json_error_t *error) {
> +    lex_t lex;
> +    json_t *result;
> +    string_data_t stream_data;
> +
> +    jsonp_error_init(error, "<string>");
> +
> +    if (string == NULL) {
> +        error_set(error, NULL, json_error_invalid_argument, "wrong arguments");
> +        return NULL;
> +    }
> +
> +    stream_data.data = string;
> +    stream_data.pos = 0;
> +
> +    if (lex_init(&lex, string_get, flags, (void *)&stream_data))
> +        return NULL;
> +
> +    result = parse_json(&lex, flags, error);
> +
> +    lex_close(&lex);
> +    return result;
> +}
> +
> +typedef struct {
> +    const char *data;
> +    size_t len;
> +    size_t pos;
> +} buffer_data_t;
> +
> +static int buffer_get(void *data) {
> +    char c;
> +    buffer_data_t *stream = data;
> +    if (stream->pos >= stream->len)
> +        return EOF;
> +
> +    c = stream->data[stream->pos];
> +    stream->pos++;
> +    return (unsigned char)c;
> +}
> +
> +json_t *json_loadb(const char *buffer, size_t buflen, size_t flags, json_error_t *error) {
> +    lex_t lex;
> +    json_t *result;
> +    buffer_data_t stream_data;
> +
> +    jsonp_error_init(error, "<buffer>");
> +
> +    if (buffer == NULL) {
> +        error_set(error, NULL, json_error_invalid_argument, "wrong arguments");
> +        return NULL;
> +    }
> +
> +    stream_data.data = buffer;
> +    stream_data.pos = 0;
> +    stream_data.len = buflen;
> +
> +    if (lex_init(&lex, buffer_get, flags, (void *)&stream_data))
> +        return NULL;
> +
> +    result = parse_json(&lex, flags, error);
> +
> +    lex_close(&lex);
> +    return result;
> +}
> +
> +json_t *json_loadf(FILE *input, size_t flags, json_error_t *error) {
> +    lex_t lex;
> +    const char *source;
> +    json_t *result;
> +#ifdef HAVE_UNISTD_H
> +    if (input == stdin)
> +        source = "<stdin>";
> +    else
> +#endif
> +        source = "<stream>";
> +
> +    jsonp_error_init(error, source);
> +
> +    if (input == NULL) {
> +        error_set(error, NULL, json_error_invalid_argument, "wrong arguments");
> +        return NULL;
> +    }
> +
> +    if (lex_init(&lex, (get_func)fgetc, flags, input))
> +        return NULL;
> +
> +    result = parse_json(&lex, flags, error);
> +
> +    lex_close(&lex);
> +    return result;
> +}
> +
> +static int fd_get_func(int *fd) {
> +#ifdef HAVE_UNISTD_H
> +    uint8_t c;
> +    if (read(*fd, &c, 1) == 1)
> +        return c;
> +#endif
> +    return EOF;
> +}
> +
> +json_t *json_loadfd(int input, size_t flags, json_error_t *error) {
> +    lex_t lex;
> +    const char *source;
> +    json_t *result;
> +
> +#ifdef HAVE_UNISTD_H
> +    if (input == STDIN_FILENO)
> +        source = "<stdin>";
> +    else
> +#endif
> +        source = "<stream>";
> +
> +    jsonp_error_init(error, source);
> +
> +    if (input < 0) {
> +        error_set(error, NULL, json_error_invalid_argument, "wrong arguments");
> +        return NULL;
> +    }
> +
> +    if (lex_init(&lex, (get_func)fd_get_func, flags, &input))
> +        return NULL;
> +
> +    result = parse_json(&lex, flags, error);
> +
> +    lex_close(&lex);
> +    return result;
> +}
> +
> +json_t *json_load_file(const char *path, size_t flags, json_error_t *error) {
> +    json_t *result;
> +    FILE *fp;
> +
> +    jsonp_error_init(error, path);
> +
> +    if (path == NULL) {
> +        error_set(error, NULL, json_error_invalid_argument, "wrong arguments");
> +        return NULL;
> +    }
> +
> +    fp = fopen(path, "rb");
> +    if (!fp) {
> +        error_set(error, NULL, json_error_cannot_open_file, "unable to open %s: %s", path,
> +                  strerror(errno));
> +        return NULL;
> +    }
> +
> +    result = json_loadf(fp, flags, error);
> +
> +    fclose(fp);
> +    return result;
> +}
> +
> +#define MAX_BUF_LEN 1024
> +
> +typedef struct {
> +    char data[MAX_BUF_LEN];
> +    size_t len;
> +    size_t pos;
> +    json_load_callback_t callback;
> +    void *arg;
> +} callback_data_t;
> +
> +static int callback_get(void *data) {
> +    char c;
> +    callback_data_t *stream = data;
> +
> +    if (stream->pos >= stream->len) {
> +        stream->pos = 0;
> +        stream->len = stream->callback(stream->data, MAX_BUF_LEN, stream->arg);
> +        if (stream->len == 0 || stream->len == (size_t)-1)
> +            return EOF;
> +    }
> +
> +    c = stream->data[stream->pos];
> +    stream->pos++;
> +    return (unsigned char)c;
> +}
> +
> +json_t *json_load_callback(json_load_callback_t callback, void *arg, size_t flags,
> +                           json_error_t *error) {
> +    lex_t lex;
> +    json_t *result;
> +
> +    callback_data_t stream_data;
> +
> +    memset(&stream_data, 0, sizeof(stream_data));
> +    stream_data.callback = callback;
> +    stream_data.arg = arg;
> +
> +    jsonp_error_init(error, "<callback>");
> +
> +    if (callback == NULL) {
> +        error_set(error, NULL, json_error_invalid_argument, "wrong arguments");
> +        return NULL;
> +    }
> +
> +    if (lex_init(&lex, (get_func)callback_get, flags, &stream_data))
> +        return NULL;
> +
> +    result = parse_json(&lex, flags, error);
> +
> +    lex_close(&lex);
> +    return result;
> +}
> diff --git a/RedfishPkg/Library/JsonLib/math.h b/RedfishPkg/Library/JsonLib/math.h
> new file mode 100644
> index 0000000000..9a478c0f8a
> --- /dev/null
> +++ b/RedfishPkg/Library/JsonLib/math.h
> @@ -0,0 +1,16 @@
> +/** @file
> +  Include file to support building the third-party jansson library.
> +
> + Copyright (c) 2019, Intel Corporation. All rights reserved.<BR>
> + (C) Copyright 2020 Hewlett Packard Enterprise Development LP<BR>
> +
> +    SPDX-License-Identifier: BSD-2-Clause-Patent
> +
> +**/
> +
> +#ifndef JANSSON_CRT_MATH_H_
> +#define JANSSON_CRT_MATH_H_
> +
> +#include <JanssonCrtLibSupport.h>
> +
> +#endif
> diff --git a/RedfishPkg/Library/JsonLib/stdarg.h b/RedfishPkg/Library/JsonLib/stdarg.h
> new file mode 100644
> index 0000000000..868fcd5cca
> --- /dev/null
> +++ b/RedfishPkg/Library/JsonLib/stdarg.h
> @@ -0,0 +1,15 @@
> +/** @file
> +  Include file to support building the third-party jansson library.
> +
> + Copyright (c) 2019, Intel Corporation. All rights reserved.<BR>
> + (C) Copyright 2020 Hewlett Packard Enterprise Development LP<BR>
> +
> +    SPDX-License-Identifier: BSD-2-Clause-Patent
> +
> +**/
> +#ifndef JANSSON_CRT_STDARG_H_
> +#define JANSSON_CRT_STDARG_H_
> +
> +#include <JanssonCrtLibSupport.h>
> +
> +#endif
> diff --git a/RedfishPkg/Library/JsonLib/stddef.h b/RedfishPkg/Library/JsonLib/stddef.h
> new file mode 100644
> index 0000000000..8250f280b3
> --- /dev/null
> +++ b/RedfishPkg/Library/JsonLib/stddef.h
> @@ -0,0 +1,16 @@
> +/** @file
> +  Include file to support building the third-party jansson library.
> +
> + Copyright (c) 2019, Intel Corporation. All rights reserved.<BR>
> + (C) Copyright 2020 Hewlett Packard Enterprise Development LP<BR>
> +
> +    SPDX-License-Identifier: BSD-2-Clause-Patent
> +
> +**/
> +
> +#ifndef JANSSON_CRT_STDDEF_H_
> +#define JANSSON_CRT_STDDEF_H_
> +
> +#include <JanssonCrtLibSupport.h>
> +
> +#endif
> diff --git a/RedfishPkg/Library/JsonLib/stdio.h b/RedfishPkg/Library/JsonLib/stdio.h
> new file mode 100644
> index 0000000000..5aa15b969f
> --- /dev/null
> +++ b/RedfishPkg/Library/JsonLib/stdio.h
> @@ -0,0 +1,15 @@
> +/** @file
> +  Include file to support building the third-party jansson library.
> +
> + Copyright (c) 2019, Intel Corporation. All rights reserved.<BR>
> + (C) Copyright 2020 Hewlett Packard Enterprise Development LP<BR>
> +
> +    SPDX-License-Identifier: BSD-2-Clause-Patent
> +
> +**/
> +#ifndef JANSSON_CRT_STDIO_H_
> +#define JANSSON_CRT_STDIO_H_
> +
> +#include <JanssonCrtLibSupport.h>
> +
> +#endif
> diff --git a/RedfishPkg/Library/JsonLib/stdlib.h b/RedfishPkg/Library/JsonLib/stdlib.h
> new file mode 100644
> index 0000000000..dfbfd85655
> --- /dev/null
> +++ b/RedfishPkg/Library/JsonLib/stdlib.h
> @@ -0,0 +1,16 @@
> +/** @file
> +  Include file to support building the third-party jansson library.
> +
> + Copyright (c) 2019, Intel Corporation. All rights reserved.<BR>
> + (C) Copyright 2020 Hewlett Packard Enterprise Development LP<BR>
> +
> +    SPDX-License-Identifier: BSD-2-Clause-Patent
> +
> +**/
> +
> +#ifndef JANSSON_CRT_STDLIB_H_
> +#define JANSSON_CRT_STDLIB_H_
> +
> +#include <JanssonCrtLibSupport.h>
> +
> +#endif
> diff --git a/RedfishPkg/Library/JsonLib/string.h b/RedfishPkg/Library/JsonLib/string.h
> new file mode 100644
> index 0000000000..691de583a3
> --- /dev/null
> +++ b/RedfishPkg/Library/JsonLib/string.h
> @@ -0,0 +1,16 @@
> +/** @file
> +  Include file to support building the third-party jansson library.
> +
> + Copyright (c) 2019, Intel Corporation. All rights reserved.<BR>
> + (C) Copyright 2020 Hewlett Packard Enterprise Development LP<BR>
> +
> +    SPDX-License-Identifier: BSD-2-Clause-Patent
> +
> +**/
> +
> +#ifndef JANSSON_CRT_STRING_H_
> +#define JANSSON_CRT_STRING_H_
> +
> +#include <JanssonCrtLibSupport.h>
> +
> +#endif
> diff --git a/RedfishPkg/Library/JsonLib/sys/time.h b/RedfishPkg/Library/JsonLib/sys/time.h
> new file mode 100644
> index 0000000000..5039c1991c
> --- /dev/null
> +++ b/RedfishPkg/Library/JsonLib/sys/time.h
> @@ -0,0 +1,15 @@
> +/** @file
> +  Include file to support building the third-party jansson library.
> +
> + Copyright (c) 2019, Intel Corporation. All rights reserved.<BR>
> + (C) Copyright 2020 Hewlett Packard Enterprise Development LP<BR>
> +
> +    SPDX-License-Identifier: BSD-2-Clause-Patent
> +
> +**/
> +#ifndef JANSSON_CRT_SYS_TIME_H_
> +#define JANSSON_CRT_SYS_TIME_H_
> +
> +#include <JanssonCrtLibSupport.h>
> +
> +#endif
> diff --git a/RedfishPkg/Library/JsonLib/sys/types.h b/RedfishPkg/Library/JsonLib/sys/types.h
> new file mode 100644
> index 0000000000..f2e23cf82f
> --- /dev/null
> +++ b/RedfishPkg/Library/JsonLib/sys/types.h
> @@ -0,0 +1,15 @@
> +/** @file
> +  Include file to support building the third-party jansson library.
> +
> + Copyright (c) 2019, Intel Corporation. All rights reserved.<BR>
> + (C) Copyright 2020 Hewlett Packard Enterprise Development LP<BR>
> +
> +    SPDX-License-Identifier: BSD-2-Clause-Patent
> +
> +**/
> +#ifndef JANSSON_CRT_SYS_TYPES_H_
> +#define JANSSON_CRT_SYS_TYPES_H_
> +
> +#include <JanssonCrtLibSupport.h>
> +
> +#endif
> diff --git a/RedfishPkg/Library/JsonLib/time.h b/RedfishPkg/Library/JsonLib/time.h
> new file mode 100644
> index 0000000000..dd05279b24
> --- /dev/null
> +++ b/RedfishPkg/Library/JsonLib/time.h
> @@ -0,0 +1,15 @@
> +/** @file
> +  Include file to support building the third-party jansson library.
> +
> + Copyright (c) 2019, Intel Corporation. All rights reserved.<BR>
> + (C) Copyright 2020 Hewlett Packard Enterprise Development LP<BR>
> +
> +    SPDX-License-Identifier: BSD-2-Clause-Patent
> +
> +**/
> +#ifndef JANSSON_CRT_TIME_H_
> +#define JANSSON_CRT_TIME_H_
> +
> +#include <JanssonCrtLibSupport.h>
> +
> +#endif
> diff --git a/RedfishPkg/RedfishPkg.ci.yaml b/RedfishPkg/RedfishPkg.ci.yaml
> index 20c297ad22..78c2814d04 100644
> --- a/RedfishPkg/RedfishPkg.ci.yaml
> +++ b/RedfishPkg/RedfishPkg.ci.yaml
> @@ -17,6 +17,30 @@
>          ],
>          ## Both file path and directory path are accepted.
>          "IgnoreFiles": [
> +            ## Below are files incorporated with open source which are
> +            ## not edk2 coding standard compliant.
> +            ##
> +            ## For jansson library open source
> +            ## load.c is overrided from open source.
> +            "Library/JsonLib/load.c",
> +            ## EDKII JsonLib API to jansson API mapping definitions.
> +            "Include/Library/JanssonJsonLibMapping.h",
> +            ## C runtime library for EDKII JsonLib.
> +            "Library/JsonLib/sys",
> +            "Library/JsonLib/JanssonCrtLibSupport.c",
> +            "Library/JsonLib/JanssonCrtLibSupport.h",
> +            "Library/JsonLib/assert.h",
> +            "Library/JsonLib/errno.h",
> +            "Library/JsonLib/jansson_config.h",
> +            "Library/JsonLib/jansson_private_config.h",
> +            "Library/JsonLib/limits.h",
> +            "Library/JsonLib/math.h",
> +            "Library/JsonLib/stdarg.h",
> +            "Library/JsonLib/stddef.h",
> +            "Library/JsonLib/stdio.h",
> +            "Library/JsonLib/stdlib.h",
> +            "Library/JsonLib/string.h",
> +            "Library/JsonLib/time.h"
>          ]
>      },
>      "CompilerPlugin": {
> @@ -50,7 +74,14 @@
>          "IgnoreFoldersAndFiles": []
>      },
>      "LibraryClassCheck": {
> -        "IgnoreHeaderFile": []
> +        "IgnoreHeaderFile": [
> +            ## Below header file can be used by open source
> +            ## project which uses jansson library. Use this
> +            ## header file to map jansson native APIs to
> +            ## edk2 JsonLib APIs.This header file doesn't
> +            ## have the corresponding library class.
> +            "Include/Library/JanssonJsonLibMapping.h"
> +        ]
>      },
>  
>      ## options defined ci/Plugin/SpellCheck
> -- 
> 2.17.1
>