[RestJsonStructureDxe PATCH v3 2/3] RedfishPkg/RestJsonStructureDxe: EFI REST JSON Structure Protocol

["Abner Chang" <abner.chang@hpe.com>]

Implementation of EFI_REST_JSON_STRUCTURE_PROTOCOL, refer to UEFI spec
2.8 Section 29.7.3 EFI REST JSON Resource to C Structure Converter.

Signed-off-by: Abner Chang <abner.chang@hpe.com>

Cc: Jiaxin Wu <jiaxin.wu@intel.com>
Cc: Siyuan Fu <siyuan.fu@intel.com>
Cc: Fan Wang <fan.wang@intel.com>
Cc: Jiewen Yao <jiewen.yao@intel.com>
Cc: Nickle Wang <nickle.wang@hpe.com>
---
 RedfishPkg/RedfishPkg.dsc                     |  11 +
 .../RestJsonStructureDxe.c                    | 585 ++++++++++++++++++
 .../RestJsonStructureDxe.inf                  |  40 ++
 .../RestJsonStructureInternal.h               |  33 +
 4 files changed, 669 insertions(+)
 create mode 100644 RedfishPkg/RestJsonStructureDxe/RestJsonStructureDxe.c
 create mode 100644 RedfishPkg/RestJsonStructureDxe/RestJsonStructureDxe.inf
 create mode 100644 RedfishPkg/RestJsonStructureDxe/RestJsonStructureInternal.h

diff --git a/RedfishPkg/RedfishPkg.dsc b/RedfishPkg/RedfishPkg.dsc
index 8acadddefc..f0c6740fac 100644
--- a/RedfishPkg/RedfishPkg.dsc
+++ b/RedfishPkg/RedfishPkg.dsc
@@ -38,3 +38,14 @@
   DxeServicesTableLib|MdePkg/Library/DxeServicesTableLib/DxeServicesTableLib.inf
   DxeServicesLib|MdePkg/Library/DxeServicesLib/DxeServicesLib.inf
   ReportStatusCodeLib|MdeModulePkg/Library/DxeReportStatusCodeLib/DxeReportStatusCodeLib.inf
+
+[LibraryClasses.ARM, LibraryClasses.AARCH64]
+  #
+  # This library provides the instrinsic functions generated by a given compiler.
+  #
+  NULL|ArmPkg/Library/CompilerIntrinsicsLib/CompilerIntrinsicsLib.inf
+  NULL|MdePkg/Library/BaseStackCheckLib/BaseStackCheckLib.inf
+  ArmSoftFloatLib|ArmPkg/Library/ArmSoftFloatLib/ArmSoftFloatLib.inf
+
+[Components]
+  RedfishPkg/RestJsonStructureDxe/RestJsonStructureDxe.inf
diff --git a/RedfishPkg/RestJsonStructureDxe/RestJsonStructureDxe.c b/RedfishPkg/RestJsonStructureDxe/RestJsonStructureDxe.c
new file mode 100644
index 0000000000..03fbecf993
--- /dev/null
+++ b/RedfishPkg/RestJsonStructureDxe/RestJsonStructureDxe.c
@@ -0,0 +1,585 @@
+/** @file
+
+  The implementation of EFI REST Resource JSON to C structure convertor
+  Protocol.
+
+  (C) Copyright 2020 Hewlett Packard Enterprise Development LP<BR>
+
+  SPDX-License-Identifier: BSD-2-Clause-Patent
+
+**/
+
+#include <Uefi.h>
+#include <Protocol/RestJsonStructure.h>
+#include "RestJsonStructureInternal.h"
+
+LIST_ENTRY mRestJsonStructureList;
+EFI_HANDLE mProtocolHandle;
+
+/**
+  This function registers Restful resource interpreter for the
+  specific schema.
+
+  @param[in]    This                     This is the EFI_REST_JSON_STRUCTURE_PROTOCOL instance.
+  @param[in]    JsonStructureSupported   The type and version of REST JSON resource which this converter
+                                         supports.
+  @param[in]    ToStructure              The function to convert REST JSON resource to structure.
+  @param[in]    ToJson                   The function to convert REST JSON structure to JSON in text format.
+  @param[in]    DestroyStructure         Destroy REST JSON structure returned in ToStructure()  function.
+
+  @retval EFI_SUCCESS             Register successfully.
+  @retval Others                  Fail to register.
+
+**/
+EFI_STATUS
+EFIAPI
+RestJsonStructureRegister (
+  IN EFI_REST_JSON_STRUCTURE_PROTOCOL       *This,
+  IN EFI_REST_JSON_STRUCTURE_SUPPORTED      *JsonStructureSupported,
+  IN EFI_REST_JSON_STRUCTURE_TO_STRUCTURE   ToStructure,
+  IN EFI_REST_JSON_STRUCTURE_TO_JSON        ToJson,
+  IN EFI_REST_JSON_STRUCTURE_DESTORY_STRUCTURE DestroyStructure
+)
+{
+  UINTN NumberOfNS;
+  UINTN Index;
+  LIST_ENTRY *ThisList;
+  REST_JSON_STRUCTURE_INSTANCE *Instance;
+  EFI_REST_JSON_RESOURCE_TYPE_IDENTIFIER *CloneSupportedInterpId;
+  EFI_REST_JSON_STRUCTURE_SUPPORTED *ThisSupportedInterp;
+
+  if (This == NULL ||
+      ToStructure == NULL ||
+      ToJson == NULL ||
+      DestroyStructure == NULL ||
+      JsonStructureSupported == NULL
+      ) {
+    return EFI_INVALID_PARAMETER;
+  }
+
+  //
+  // Check how many name space interpreter can interpret.
+  //
+  ThisList = &JsonStructureSupported->NextSupportedRsrcInterp;
+  NumberOfNS = 1;
+  while (TRUE) {
+    if (ThisList->ForwardLink == &JsonStructureSupported->NextSupportedRsrcInterp) {
+      break;
+    } else {
+      ThisList = ThisList->ForwardLink;
+      NumberOfNS ++;
+    }
+  };
+
+  Instance =
+    (REST_JSON_STRUCTURE_INSTANCE *)AllocateZeroPool (sizeof (REST_JSON_STRUCTURE_INSTANCE) + NumberOfNS * sizeof (EFI_REST_JSON_RESOURCE_TYPE_IDENTIFIER));
+  if (Instance == NULL) {
+    return EFI_OUT_OF_RESOURCES;
+  }
+  InitializeListHead (&Instance->NextRestJsonStructureInstance);
+  Instance->NumberOfNameSpaceToConvert = NumberOfNS;
+  Instance->SupportedRsrcIndentifier = (EFI_REST_JSON_RESOURCE_TYPE_IDENTIFIER *)((REST_JSON_STRUCTURE_INSTANCE *)Instance + 1);
+  //
+  // Copy supported resource identifer interpreter.
+  //
+  CloneSupportedInterpId = Instance->SupportedRsrcIndentifier;
+  ThisSupportedInterp = JsonStructureSupported;
+  for (Index = 0; Index < NumberOfNS; Index ++) {
+    CopyMem ((VOID *)CloneSupportedInterpId, (VOID *)&ThisSupportedInterp->RestResourceInterp, sizeof (EFI_REST_JSON_RESOURCE_TYPE_IDENTIFIER));
+    ThisSupportedInterp = (EFI_REST_JSON_STRUCTURE_SUPPORTED *)ThisSupportedInterp->NextSupportedRsrcInterp.ForwardLink;
+    CloneSupportedInterpId ++;
+  }
+  Instance->JsonToStructure = ToStructure;
+  Instance->StructureToJson = ToJson;
+  Instance->DestroyStructure = DestroyStructure;
+  InsertTailList (&mRestJsonStructureList, &Instance->NextRestJsonStructureInstance);
+  return EFI_SUCCESS;
+}
+
+/**
+  This function check if this interpreter instance support the given namesapce.
+
+  @param[in]    This                EFI_REST_JSON_STRUCTURE_PROTOCOL instance.
+  @param[in]    InterpreterInstance REST_JSON_STRUCTURE_INSTANCE
+  @param[in]    RsrcTypeIdentifier  Resource type identifier.
+  @param[in]    ResourceRaw         Given Restful resource.
+  @param[out]   RestJSonHeader      Property interpreted from given ResourceRaw.
+
+  @retval EFI_SUCCESS
+  @retval Others.
+
+**/
+EFI_STATUS
+InterpreterInstanceToStruct (
+  IN EFI_REST_JSON_STRUCTURE_PROTOCOL         *This,
+  IN REST_JSON_STRUCTURE_INSTANCE             *InterpreterInstance,
+  IN EFI_REST_JSON_RESOURCE_TYPE_IDENTIFIER   *RsrcTypeIdentifier OPTIONAL,
+  IN CHAR8                                    *ResourceRaw,
+  OUT EFI_REST_JSON_STRUCTURE_HEADER          **RestJSonHeader
+ )
+{
+  UINTN Index;
+  EFI_STATUS Status;
+  EFI_REST_JSON_RESOURCE_TYPE_IDENTIFIER *ThisSupportedRsrcTypeId;
+
+  if (This == NULL ||
+      InterpreterInstance == NULL ||
+      ResourceRaw == NULL ||
+      RestJSonHeader == NULL
+      ) {
+      return EFI_INVALID_PARAMETER;
+  }
+
+  Status = EFI_UNSUPPORTED;
+  if (RsrcTypeIdentifier == NULL) {
+    //
+    // No resource type identifier, send to intepreter anyway.
+    // Interpreter may recognize this resource.
+    //
+    Status = InterpreterInstance->JsonToStructure (
+                This,
+                NULL,
+                ResourceRaw,
+                RestJSonHeader
+                );
+  } else {
+    //
+    // Check if the namesapce and version is supported by this interpreter.
+    //
+    ThisSupportedRsrcTypeId = InterpreterInstance->SupportedRsrcIndentifier;
+    for (Index = 0; Index < InterpreterInstance->NumberOfNameSpaceToConvert; Index ++){
+      if (AsciiStrCmp (
+            RsrcTypeIdentifier->NameSpace.ResourceTypeName,
+            ThisSupportedRsrcTypeId->NameSpace.ResourceTypeName) == 0){
+        if ((RsrcTypeIdentifier->NameSpace.MajorVersion == NULL) &&
+            (RsrcTypeIdentifier->NameSpace.MinorVersion == NULL) &&
+            (RsrcTypeIdentifier->NameSpace.ErrataVersion == NULL)
+            ) {
+          //
+          // Don't check version of this resource type identifier.
+          //
+          Status = InterpreterInstance->JsonToStructure (
+                      This,
+                      RsrcTypeIdentifier,
+                      ResourceRaw,
+                      RestJSonHeader
+                      );
+          break;
+        } else {
+          //
+          // Check version.
+          //
+          if ((AsciiStrCmp (
+                RsrcTypeIdentifier->NameSpace.MajorVersion,
+                ThisSupportedRsrcTypeId->NameSpace.MajorVersion) == 0) &&
+              (AsciiStrCmp (
+                RsrcTypeIdentifier->NameSpace.MinorVersion,
+                ThisSupportedRsrcTypeId->NameSpace.MinorVersion) == 0) &&
+              (AsciiStrCmp (
+                RsrcTypeIdentifier->NameSpace.ErrataVersion,
+                ThisSupportedRsrcTypeId->NameSpace.ErrataVersion) == 0)) {
+            Status = InterpreterInstance->JsonToStructure (
+                      This,
+                      RsrcTypeIdentifier,
+                      ResourceRaw,
+                      RestJSonHeader
+                      );
+            break;
+          }
+        }
+      }
+      ThisSupportedRsrcTypeId ++;
+    }
+  }
+  return Status;
+}
+/**
+  This function converts JSON C structure to JSON property.
+
+  @param[in]    This                 EFI_REST_JSON_STRUCTURE_PROTOCOL instance.
+  @param[in]    InterpreterInstance  REST_JSON_STRUCTURE_INSTANCE
+  @param[in]    RestJSonHeader       Resource type identifier.
+  @param[out]   ResourceRaw          Output in JSON text format.
+
+  @retval EFI_SUCCESS
+  @retval Others.
+
+**/
+EFI_STATUS
+InterpreterEfiStructToInstance (
+  IN EFI_REST_JSON_STRUCTURE_PROTOCOL   *This,
+  IN REST_JSON_STRUCTURE_INSTANCE       *InterpreterInstance,
+  IN EFI_REST_JSON_STRUCTURE_HEADER     *RestJSonHeader,
+  OUT CHAR8 **ResourceRaw
+)
+{
+  UINTN Index;
+  EFI_STATUS Status;
+  EFI_REST_JSON_RESOURCE_TYPE_IDENTIFIER *ThisSupportedRsrcTypeId;
+  EFI_REST_JSON_RESOURCE_TYPE_IDENTIFIER *RsrcTypeIdentifier;
+
+  if (This == NULL ||
+      InterpreterInstance == NULL ||
+      RestJSonHeader == NULL ||
+      ResourceRaw == NULL
+      ) {
+    return EFI_INVALID_PARAMETER;
+  }
+  RsrcTypeIdentifier = &RestJSonHeader->JsonRsrcIdentifier;
+  if (RsrcTypeIdentifier == NULL ||
+      RsrcTypeIdentifier->NameSpace.ResourceTypeName == NULL ||
+      RsrcTypeIdentifier->NameSpace.MajorVersion == NULL ||
+      RsrcTypeIdentifier->NameSpace.MinorVersion == NULL ||
+      RsrcTypeIdentifier->NameSpace.ErrataVersion == NULL
+      ) {
+    return EFI_INVALID_PARAMETER;
+  }
+
+  //
+  // Check if the namesapce and version is supported by this interpreter.
+  //
+  Status = EFI_UNSUPPORTED;
+  ThisSupportedRsrcTypeId = InterpreterInstance->SupportedRsrcIndentifier;
+  for (Index = 0; Index < InterpreterInstance->NumberOfNameSpaceToConvert; Index ++){
+    if (AsciiStrCmp (
+          RsrcTypeIdentifier->NameSpace.ResourceTypeName,
+          ThisSupportedRsrcTypeId->NameSpace.ResourceTypeName) == 0){
+      //
+      // Check version.
+      //
+      if ((AsciiStrCmp (
+            RsrcTypeIdentifier->NameSpace.MajorVersion,
+            ThisSupportedRsrcTypeId->NameSpace.MajorVersion) == 0) &&
+          (AsciiStrCmp (
+            RsrcTypeIdentifier->NameSpace.MinorVersion,
+            ThisSupportedRsrcTypeId->NameSpace.MinorVersion) == 0) &&
+          (AsciiStrCmp (
+            RsrcTypeIdentifier->NameSpace.ErrataVersion,
+            ThisSupportedRsrcTypeId->NameSpace.ErrataVersion) == 0)) {
+        Status = InterpreterInstance->StructureToJson (
+                  This,
+                  RestJSonHeader,
+                  ResourceRaw
+                  );
+        break;
+      }
+    }
+    ThisSupportedRsrcTypeId ++;
+  }
+  return Status;
+}
+
+/**
+  This function destory REST property structure.
+
+  @param[in]    This                 EFI_REST_JSON_STRUCTURE_PROTOCOL instance.
+  @param[in]    InterpreterInstance  REST_JSON_STRUCTURE_INSTANCE
+  @param[in]    RestJSonHeader       Property interpreted from given ResourceRaw.
+
+  @retval EFI_SUCCESS
+  @retval Others.
+
+**/
+EFI_STATUS
+InterpreterInstanceDestoryJsonStruct (
+  IN EFI_REST_JSON_STRUCTURE_PROTOCOL       *This,
+  IN REST_JSON_STRUCTURE_INSTANCE           *InterpreterInstance,
+  IN EFI_REST_JSON_STRUCTURE_HEADER         *RestJSonHeader
+ )
+{
+  UINTN Index;
+  EFI_STATUS Status;
+  EFI_REST_JSON_RESOURCE_TYPE_IDENTIFIER *ThisSupportedRsrcTypeId;
+
+  if (This == NULL ||
+      InterpreterInstance == NULL ||
+      RestJSonHeader == NULL
+      ) {
+    return EFI_INVALID_PARAMETER;
+  }
+
+  Status = EFI_UNSUPPORTED;
+  //
+  // Check if the namesapce and version is supported by this interpreter.
+  //
+  ThisSupportedRsrcTypeId = InterpreterInstance->SupportedRsrcIndentifier;
+  for (Index = 0; Index < InterpreterInstance->NumberOfNameSpaceToConvert; Index ++){
+    if (AsciiStrCmp (
+          RestJSonHeader->JsonRsrcIdentifier.NameSpace.ResourceTypeName,
+          ThisSupportedRsrcTypeId->NameSpace.ResourceTypeName) == 0) {
+      if ((RestJSonHeader->JsonRsrcIdentifier.NameSpace.MajorVersion == NULL) &&
+          (RestJSonHeader->JsonRsrcIdentifier.NameSpace.MinorVersion == NULL) &&
+          (RestJSonHeader->JsonRsrcIdentifier.NameSpace.ErrataVersion == NULL)
+          ) {
+        //
+        // Don't check version of this resource type identifier.
+        //
+        Status = InterpreterInstance->DestroyStructure (
+                    This,
+                    RestJSonHeader
+                    );
+        break;
+      } else {
+        //
+        // Check version.
+        //
+        if ((AsciiStrCmp (
+              RestJSonHeader->JsonRsrcIdentifier.NameSpace.MajorVersion,
+              ThisSupportedRsrcTypeId->NameSpace.MajorVersion) == 0) &&
+            (AsciiStrCmp (
+              RestJSonHeader->JsonRsrcIdentifier.NameSpace.MinorVersion,
+              ThisSupportedRsrcTypeId->NameSpace.MinorVersion) == 0) &&
+            (AsciiStrCmp (
+              RestJSonHeader->JsonRsrcIdentifier.NameSpace.ErrataVersion,
+              ThisSupportedRsrcTypeId->NameSpace.ErrataVersion) == 0)) {
+          Status = InterpreterInstance->DestroyStructure (
+                    This,
+                    RestJSonHeader
+                    );
+          break;
+        }
+      }
+    }
+    ThisSupportedRsrcTypeId ++;
+  }
+  return Status;
+}
+
+/**
+  This function translates the given JSON text to JSON C Structure.
+
+  @param[in]    This                EFI_REST_JSON_STRUCTURE_PROTOCOL instance.
+  @param[in]    RsrcTypeIdentifier  Resource type identifier.
+  @param[in]    ResourceJsonText    Given Restful resource.
+  @param[out]   JsonStructure       Property interpreted from given ResourceRaw.
+
+  @retval EFI_SUCCESS
+  @retval Others.
+
+**/
+EFI_STATUS
+EFIAPI
+RestJsonStructureToStruct (
+  IN EFI_REST_JSON_STRUCTURE_PROTOCOL       *This,
+  IN EFI_REST_JSON_RESOURCE_TYPE_IDENTIFIER *RsrcTypeIdentifier OPTIONAL,
+  IN CHAR8                                  *ResourceJsonText,
+  OUT EFI_REST_JSON_STRUCTURE_HEADER        **JsonStructure
+)
+{
+  EFI_STATUS Status;
+  REST_JSON_STRUCTURE_INSTANCE *Instance;
+
+  if (This == NULL ||
+      ResourceJsonText == NULL ||
+      JsonStructure == NULL
+    ) {
+    return EFI_INVALID_PARAMETER;
+  }
+
+  if (IsListEmpty (&mRestJsonStructureList)) {
+    return EFI_UNSUPPORTED;
+  }
+  Status = EFI_SUCCESS;
+  Instance = (REST_JSON_STRUCTURE_INSTANCE *)GetFirstNode (&mRestJsonStructureList);
+  while (TRUE) {
+    Status = InterpreterInstanceToStruct (
+                This,
+                Instance,
+                RsrcTypeIdentifier,
+                ResourceJsonText,
+                JsonStructure
+              );
+    if (!EFI_ERROR (Status)) {
+      break;
+    }
+    if (IsNodeAtEnd(&mRestJsonStructureList, &Instance->NextRestJsonStructureInstance)) {
+      Status = EFI_UNSUPPORTED;
+      break;
+    }
+    Instance = (REST_JSON_STRUCTURE_INSTANCE *)GetNextNode (&mRestJsonStructureList, &Instance->NextRestJsonStructureInstance);
+  };
+  return Status;
+}
+
+/**
+  This function destory REST property EFI structure which returned in
+  JsonToStructure().
+
+  @param[in]    This            EFI_REST_JSON_STRUCTURE_PROTOCOL instance.
+  @param[in]    RestJSonHeader  Property to destory.
+
+  @retval EFI_SUCCESS
+  @retval Others
+
+**/
+EFI_STATUS
+EFIAPI
+RestJsonStructureDestroyStruct (
+  IN EFI_REST_JSON_STRUCTURE_PROTOCOL *This,
+  IN EFI_REST_JSON_STRUCTURE_HEADER  *RestJSonHeader
+)
+{
+  EFI_STATUS Status;
+  REST_JSON_STRUCTURE_INSTANCE *Instance;
+
+  if (This == NULL || RestJSonHeader == NULL) {
+    return EFI_INVALID_PARAMETER;
+  }
+
+  if (IsListEmpty (&mRestJsonStructureList)) {
+    return EFI_UNSUPPORTED;
+  }
+  Status = EFI_SUCCESS;
+  Instance = (REST_JSON_STRUCTURE_INSTANCE *)GetFirstNode (&mRestJsonStructureList);
+  while (TRUE) {
+    Status = InterpreterInstanceDestoryJsonStruct (
+                This,
+                Instance,
+                RestJSonHeader
+              );
+    if (!EFI_ERROR (Status)) {
+      break;
+    }
+    if (IsNodeAtEnd(&mRestJsonStructureList, &Instance->NextRestJsonStructureInstance)) {
+      Status = EFI_UNSUPPORTED;
+      break;
+    }
+    Instance = (REST_JSON_STRUCTURE_INSTANCE *)GetNextNode (&mRestJsonStructureList, &Instance->NextRestJsonStructureInstance);
+  };
+  return Status;
+}
+
+/**
+  This function translates the given JSON C Structure to JSON text.
+
+  @param[in]    This            EFI_REST_JSON_STRUCTURE_PROTOCOL instance.
+  @param[in]    RestJSonHeader  Given Restful resource.
+  @param[out]   ResourceRaw     Resource in RESTfuls service oriented.
+
+  @retval EFI_SUCCESS
+  @retval Others             Fail to remove the entry
+
+**/
+EFI_STATUS
+EFIAPI
+RestJsonStructureToJson (
+  IN EFI_REST_JSON_STRUCTURE_PROTOCOL *This,
+  IN EFI_REST_JSON_STRUCTURE_HEADER *RestJSonHeader,
+  OUT CHAR8 **ResourceRaw
+)
+{
+  EFI_STATUS Status;
+  REST_JSON_STRUCTURE_INSTANCE *Instance;
+
+  if (This == NULL || RestJSonHeader == NULL || ResourceRaw == NULL) {
+    return EFI_INVALID_PARAMETER;
+  }
+
+  if (IsListEmpty (&mRestJsonStructureList)) {
+    return EFI_UNSUPPORTED;
+  }
+  Status = EFI_SUCCESS;
+  Instance = (REST_JSON_STRUCTURE_INSTANCE *)GetFirstNode (&mRestJsonStructureList);
+  while (TRUE) {
+    Status = InterpreterEfiStructToInstance (
+                This,
+                Instance,
+                RestJSonHeader,
+                ResourceRaw
+              );
+    if (!EFI_ERROR (Status)) {
+      break;
+    }
+    if (IsNodeAtEnd(&mRestJsonStructureList, &Instance->NextRestJsonStructureInstance)) {
+      Status = EFI_UNSUPPORTED;
+      break;
+    }
+    Instance = (REST_JSON_STRUCTURE_INSTANCE *)GetNextNode (&mRestJsonStructureList, &Instance->NextRestJsonStructureInstance);
+  };
+  return Status;
+}
+
+EFI_REST_JSON_STRUCTURE_PROTOCOL mRestJsonStructureProtocol = {
+  RestJsonStructureRegister,
+  RestJsonStructureToStruct,
+  RestJsonStructureToJson,
+  RestJsonStructureDestroyStruct
+};
+
+/**
+  This is the declaration of an EFI image entry point.
+
+  @param  ImageHandle           The firmware allocated handle for the UEFI image.
+  @param  SystemTable           A pointer to the EFI System Table.
+
+  @retval EFI_SUCCESS           The operation completed successfully.
+  @retval Others                An unexpected error occurred.
+**/
+EFI_STATUS
+EFIAPI
+RestJsonStructureEntryPoint (
+  IN EFI_HANDLE        ImageHandle,
+  IN EFI_SYSTEM_TABLE  *SystemTable
+  )
+{
+  EFI_STATUS Status;
+
+  InitializeListHead (&mRestJsonStructureList);
+  //
+  // Install the Restful Resource Interpreter Protocol.
+  //
+  mProtocolHandle = NULL;
+  Status = gBS->InstallProtocolInterface (
+                  &mProtocolHandle,
+                  &gEfiRestJsonStructureProtocolGuid,
+                  EFI_NATIVE_INTERFACE,
+                  (VOID *)&mRestJsonStructureProtocol
+                  );
+  return Status;
+}
+
+/**
+  This is the unload handle for Redfish discover module.
+
+  Disconnect the driver specified by ImageHandle from all the devices in the handle database.
+  Uninstall all the protocols installed in the driver entry point.
+
+  @param[in] ImageHandle           The drivers' driver image.
+
+  @retval    EFI_SUCCESS           The image is unloaded.
+  @retval    Others                Failed to unload the image.
+
+**/
+EFI_STATUS
+EFIAPI
+RestJsonStructureUnload (
+  IN EFI_HANDLE ImageHandle
+  )
+{
+  EFI_STATUS Status;
+  REST_JSON_STRUCTURE_INSTANCE *Instance;
+  REST_JSON_STRUCTURE_INSTANCE *NextInstance;
+
+  if (IsListEmpty (&mRestJsonStructureList)) {
+    return EFI_SUCCESS;
+  }
+  //
+  // Free memory of REST_JSON_STRUCTURE_INSTANCE instance.
+  //
+  Instance = (REST_JSON_STRUCTURE_INSTANCE *)GetFirstNode (&mRestJsonStructureList);
+  do {
+    NextInstance = NULL;
+    if (!IsNodeAtEnd(&mRestJsonStructureList, &Instance->NextRestJsonStructureInstance)) {
+      NextInstance = (REST_JSON_STRUCTURE_INSTANCE *)GetNextNode (&mRestJsonStructureList, &Instance->NextRestJsonStructureInstance);
+    }
+    FreePool ((VOID *)Instance);
+    Instance = NextInstance;
+  } while (Instance != NULL);
+
+  Status = gBS->UninstallProtocolInterface (
+                  mProtocolHandle,
+                  &gEfiRestJsonStructureProtocolGuid,
+                  (VOID *)&mRestJsonStructureProtocol
+                  );
+  return Status;
+}
diff --git a/RedfishPkg/RestJsonStructureDxe/RestJsonStructureDxe.inf b/RedfishPkg/RestJsonStructureDxe/RestJsonStructureDxe.inf
new file mode 100644
index 0000000000..2ab1e3bc45
--- /dev/null
+++ b/RedfishPkg/RestJsonStructureDxe/RestJsonStructureDxe.inf
@@ -0,0 +1,40 @@
+## @file
+# Implementation of EFI REST JSON Structure Protocol.
+#
+#  (C) Copyright 2020 Hewlett Packard Enterprise Development LP<BR>
+#  SPDX-License-Identifier: BSD-2-Clause-Patent
+#
+##
+
+[Defines]
+  INF_VERSION               = 0x00010005
+  BASE_NAME                 = RestJsonStructureDxe
+  FILE_GUID                 = 83FAAFBF-FC4B-469F-892A-798E66A6F50A
+  MODULE_TYPE               = DXE_DRIVER
+  VERSION_STRING            = 1.0
+  ENTRY_POINT               = RestJsonStructureEntryPoint
+  UNLOAD_IMAGE              = RestJsonStructureUnload
+
+[Packages]
+  MdePkg/MdePkg.dec
+  MdeModulePkg/MdeModulePkg.dec
+  RedfishPkg/RedfishPkg.dec
+
+[Sources]
+  RestJsonStructureDxe.c
+  RestJsonStructureInternal.h
+
+[LibraryClasses]
+  BaseLib
+  BaseMemoryLib
+  MemoryAllocationLib
+  UefiBootServicesTableLib
+  UefiDriverEntryPoint
+  UefiLib
+
+[Protocols]
+  gEfiRestJsonStructureProtocolGuid    ## Producing
+
+[Depex]
+  TRUE
+
diff --git a/RedfishPkg/RestJsonStructureDxe/RestJsonStructureInternal.h b/RedfishPkg/RestJsonStructureDxe/RestJsonStructureInternal.h
new file mode 100644
index 0000000000..e8a3408404
--- /dev/null
+++ b/RedfishPkg/RestJsonStructureDxe/RestJsonStructureInternal.h
@@ -0,0 +1,33 @@
+/** @file
+  The internal definitions of EFI REST Resource JSON to C structure convertor
+  Protocol.
+
+  (C) Copyright 2020 Hewlett Packard Enterprise Development LP<BR>
+
+  SPDX-License-Identifier: BSD-2-Clause-Patent
+
+**/
+
+#ifndef EFI_REST_JSON_STRUCTURE_INTERNAL_H_
+#define EFI_REST_JSON_STRUCTURE_INTERNAL_H_
+
+#include <Library/BaseLib.h>
+#include <Library/UefiLib.h>
+#include <Library/UefiBootServicesTableLib.h>
+#include <Library/UefiDriverEntryPoint.h>
+#include <Library/BaseMemoryLib.h>
+#include <Library/MemoryAllocationLib.h>
+
+///
+/// Internal structure to maintain the information of JSON to
+/// C structure convertor.
+///
+typedef struct _REST_JSON_STRUCTURE_INSTANCE {
+  LIST_ENTRY NextRestJsonStructureInstance;  ///< Next convertor instance
+  UINTN NumberOfNameSpaceToConvert;          ///< Number of resource type this convertor supports.
+  EFI_REST_JSON_RESOURCE_TYPE_IDENTIFIER     *SupportedRsrcIndentifier; ///< The resource type linklist
+  EFI_REST_JSON_STRUCTURE_TO_STRUCTURE        JsonToStructure;          ///< JSON to C structure function
+  EFI_REST_JSON_STRUCTURE_TO_JSON             StructureToJson;          ///< C structure to JSON function
+  EFI_REST_JSON_STRUCTURE_DESTORY_STRUCTURE   DestroyStructure;         ///< Destory C struture function.
+} REST_JSON_STRUCTURE_INSTANCE;
+#endif
-- 
2.17.1