[PATCH v3 5/7] ShellPkg/AcpiView: Refactor DumpAcpiTableToFile

["Tomas Pilar (tpilar)" <Tomas.Pilar@arm.com>]

Method is refactored into two parts. A new method is
created that dumps arbitrary buffers into a newly created
file. This method is called from core code after the core code
determined the appropriate filename to be used.

This improves the modular design.

Cc: Ray Ni <ray.ni@intel.com>
Cc: Zhichao Gao <zhichao.gao@intel.com>
Signed-off-by: Tomas Pilar <tomas.pilar@arm.com>
---
 .../UefiShellAcpiViewCommandLib/AcpiView.c    | 38 +-----------
 .../UefiShellAcpiViewCommandLib.c             | 59 +++++++++++++++++++
 .../UefiShellAcpiViewCommandLib.h             | 17 +++++-
 3 files changed, 76 insertions(+), 38 deletions(-)

diff --git a/ShellPkg/Library/UefiShellAcpiViewCommandLib/AcpiView.c b/ShellPkg/Library/UefiShellAcpiViewCommandLib/AcpiView.c
index 2507ec78204b..1b6721e6734f 100644
--- a/ShellPkg/Library/UefiShellAcpiViewCommandLib/AcpiView.c
+++ b/ShellPkg/Library/UefiShellAcpiViewCommandLib/AcpiView.c
@@ -27,8 +27,6 @@
 #include "Arm/SbbrValidator.h"
 #endif
 
-EFI_HII_HANDLE gShellAcpiViewHiiHandle = NULL;
-
 STATIC UINT32             mTableCount;
 STATIC UINT32             mBinTableCount;
 
@@ -48,14 +46,10 @@ DumpAcpiTableToFile (
   IN CONST UINTN   Length
   )
 {
-  EFI_STATUS          Status;
   CHAR16              FileNameBuffer[MAX_FILE_NAME_LEN];
-  SHELL_FILE_HANDLE   DumpFileHandle;
   UINTN               TransferBytes;
   SELECTED_ACPI_TABLE *SelectedTable;
 
-  DumpFileHandle = NULL;
-  TransferBytes = Length;
   GetSelectedAcpiTable (&SelectedTable);
 
   UnicodeSPrint (
@@ -66,39 +60,9 @@ DumpAcpiTableToFile (
     mBinTableCount++
     );
 
-  Status = ShellOpenFileByName (
-             FileNameBuffer,
-             &DumpFileHandle,
-             EFI_FILE_MODE_READ | EFI_FILE_MODE_WRITE | EFI_FILE_MODE_CREATE,
-             0
-             );
-  if (EFI_ERROR (Status)) {
-    ShellPrintHiiEx (
-      -1,
-      -1,
-      NULL,
-      STRING_TOKEN (STR_GEN_READONLY_MEDIA),
-      gShellAcpiViewHiiHandle,
-      L"acpiview"
-      );
-    return FALSE;
-  }
-
   Print (L"Dumping ACPI table to : %s ... ", FileNameBuffer);
 
-  Status = ShellWriteFile (
-             DumpFileHandle,
-             &TransferBytes,
-             (VOID*)Ptr
-             );
-  if (EFI_ERROR (Status)) {
-    Print (L"ERROR: Failed to dump table to binary file.\n");
-    TransferBytes = 0;
-  } else {
-    Print (L"DONE.\n");
-  }
-
-  ShellCloseFile (&DumpFileHandle);
+  TransferBytes = ShellDumpBufferToFile (FileNameBuffer, Ptr, Length);
   return (Length == TransferBytes);
 }
 
diff --git a/ShellPkg/Library/UefiShellAcpiViewCommandLib/UefiShellAcpiViewCommandLib.c b/ShellPkg/Library/UefiShellAcpiViewCommandLib/UefiShellAcpiViewCommandLib.c
index c3942ad24e5b..e6a65d5bc5f7 100644
--- a/ShellPkg/Library/UefiShellAcpiViewCommandLib/UefiShellAcpiViewCommandLib.c
+++ b/ShellPkg/Library/UefiShellAcpiViewCommandLib/UefiShellAcpiViewCommandLib.c
@@ -25,6 +25,7 @@
 #include "UefiShellAcpiViewCommandLib.h"
 
 CONST CHAR16 gShellAcpiViewFileName[] = L"ShellCommand";
+EFI_HII_HANDLE gShellAcpiViewHiiHandle = NULL;
 
 /**
   An array of acpiview command line parameters.
@@ -98,6 +99,64 @@ RegisterAllParsers (
   return Status;
 }
 
+/**
+  Dump a buffer to a file. Print error message if a file cannot be created.
+
+  @param[in] FileName   The filename that shall be created to contain the buffer.
+  @param[in] Buffer     Pointer to buffer that shall be dumped.
+  @param[in] BufferSize The size of buffer to be dumped in bytes.
+
+  @return The number of bytes that were written
+**/
+UINTN
+EFIAPI
+ShellDumpBufferToFile (
+  IN CONST CHAR16* FileNameBuffer,
+  IN CONST VOID*   Buffer,
+  IN CONST UINTN   BufferSize
+  )
+{
+  EFI_STATUS          Status;
+  SHELL_FILE_HANDLE   DumpFileHandle;
+  UINTN               TransferBytes;
+
+  Status = ShellOpenFileByName (
+             FileNameBuffer,
+             &DumpFileHandle,
+             EFI_FILE_MODE_READ | EFI_FILE_MODE_WRITE | EFI_FILE_MODE_CREATE,
+             0
+             );
+
+  if (EFI_ERROR (Status)) {
+    ShellPrintHiiEx (
+      -1,
+      -1,
+      NULL,
+      STRING_TOKEN (STR_GEN_READONLY_MEDIA),
+      gShellAcpiViewHiiHandle,
+      L"acpiview"
+      );
+    return 0;
+  }
+
+  TransferBytes = BufferSize;
+  Status = ShellWriteFile (
+             DumpFileHandle,
+             &TransferBytes,
+             (VOID *) Buffer
+             );
+
+  if (EFI_ERROR (Status)) {
+    Print (L"ERROR: Failed to write binary file.\n");
+    TransferBytes = 0;
+  } else {
+    Print (L"DONE.\n");
+  }
+
+  ShellCloseFile (&DumpFileHandle);
+  return TransferBytes;
+}
+
 /**
   Return the file name of the help text file if not using HII.
 
diff --git a/ShellPkg/Library/UefiShellAcpiViewCommandLib/UefiShellAcpiViewCommandLib.h b/ShellPkg/Library/UefiShellAcpiViewCommandLib/UefiShellAcpiViewCommandLib.h
index a3a29164004d..b1b1ffe63e28 100644
--- a/ShellPkg/Library/UefiShellAcpiViewCommandLib/UefiShellAcpiViewCommandLib.h
+++ b/ShellPkg/Library/UefiShellAcpiViewCommandLib/UefiShellAcpiViewCommandLib.h
@@ -8,7 +8,22 @@
 #ifndef UEFI_SHELL_ACPIVIEW_COMMAND_LIB_H_
 #define UEFI_SHELL_ACPIVIEW_COMMAND_LIB_H_
 
-extern EFI_HII_HANDLE gShellAcpiViewHiiHandle;
+/**
+  Dump a buffer to a file. Print error message if a file cannot be created.
+
+  @param[in] FileName   The filename that shall be created to contain the buffer.
+  @param[in] Buffer     Pointer to buffer that shall be dumped.
+  @param[in] BufferSize The size of buffer to be dumped in bytes.
+
+  @return The number of bytes that were written
+**/
+UINTN
+EFIAPI
+ShellDumpBufferToFile (
+  IN CONST CHAR16* FileNameBuffer,
+  IN CONST VOID*   Buffer,
+  IN CONST UINTN   BufferSize
+  );
 
 /**
   Function for 'acpiview' command.
-- 
2.24.1.windows.2