EDK2编写UEFI程序，对比两个文件的内容是否一样，若不一样，将对比结果输出至新的文件

这里提供一个简单的示例代码，可以对比两个文件的内容是否一样，并将对比结果输出至新的文件。

#include <Uefi.h>
#include <Library/UefiLib.h>
#include <Library/UefiBootServicesTableLib.h>
#include <Library/BaseMemoryLib.h>
#include <Library/FileHandleLib.h>

#define FILE1_PATH L"\\file1.txt"
#define FILE2_PATH L"\\file2.txt"
#define RESULT_FILE_PATH L"\\result.txt"

EFI_STATUS
EFIAPI
CompareFiles()
{
  EFI_STATUS Status;
  EFI_FILE_HANDLE File1, File2, ResultFile;
  UINTN File1Size, File2Size;
  UINTN BufferSize;
  CHAR8 *File1Buffer, *File2Buffer;
  UINTN i;
  BOOLEAN Match = TRUE;

  // Open file 1
  Status = OpenFile(&File1, FILE1_PATH, EFI_FILE_MODE_READ);
  if (EFI_ERROR(Status)) {
    Print(L"Failed to open file 1: %r\n", Status);
    return Status;
  }

  // Open file 2
  Status = OpenFile(&File2, FILE2_PATH, EFI_FILE_MODE_READ);
  if (EFI_ERROR(Status)) {
    Print(L"Failed to open file 2: %r\n", Status);
    CloseFile(File1);
    return Status;
  }

  // Get file sizes
  Status = GetFileSize(File1, &File1Size);
  if (EFI_ERROR(Status)) {
    Print(L"Failed to get file 1 size: %r\n", Status);
    CloseFile(File1);
    CloseFile(File2);
    return Status;
  }

  Status = GetFileSize(File2, &File2Size);
  if (EFI_ERROR(Status)) {
    Print(L"Failed to get file 2 size: %r\n", Status);
    CloseFile(File1);
    CloseFile(File2);
    return Status;
  }

  // Check if file sizes match
  if (File1Size != File2Size) {
    Match = FALSE;
    Print(L"File sizes do not match!\n");
  }

  // Allocate memory for file buffers
  BufferSize = MAX(File1Size, File2Size);
  File1Buffer = AllocatePool(BufferSize);
  if (File1Buffer == NULL) {
    Print(L"Failed to allocate memory for file 1 buffer.\n");
    CloseFile(File1);
    CloseFile(File2);
    return EFI_OUT_OF_RESOURCES;
  }

  File2Buffer = AllocatePool(BufferSize);
  if (File2Buffer == NULL) {
    Print(L"Failed to allocate memory for file 2 buffer.\n");
    FreePool(File1Buffer);
    CloseFile(File1);
    CloseFile(File2);
    return EFI_OUT_OF_RESOURCES;
  }

  // Read file 1 into buffer
  Status = ReadFile(File1, File1Buffer, &BufferSize);
  if (EFI_ERROR(Status)) {
    Print(L"Failed to read file 1: %r\n", Status);
    FreePool(File1Buffer);
    FreePool(File2Buffer);
    CloseFile(File1);
    CloseFile(File2);
    return Status;
  }

  // Read file 2 into buffer
  Status = ReadFile(File2, File2Buffer, &BufferSize);
  if (EFI_ERROR(Status)) {
    Print(L"Failed to read file 2: %r\n", Status);
    FreePool(File1Buffer);
    FreePool(File2Buffer);
    CloseFile(File1);
    CloseFile(File2);
    return Status;
  }

  // Compare file buffers
  for (i = 0; i < BufferSize; i++) {
    if (File1Buffer[i] != File2Buffer[i]) {
      Match = FALSE;
      break;
    }
  }

  if (Match) {
    Print(L"Files match!\n");
  } else {
    Print(L"Files do not match!\n");
  }

  // Open result file
  Status = OpenFile(&ResultFile, RESULT_FILE_PATH, EFI_FILE_MODE_READ|EFI_FILE_MODE_WRITE|EFI_FILE_MODE_CREATE);
  if (EFI_ERROR(Status)) {
    Print(L"Failed to open result file: %r\n", Status);
    FreePool(File1Buffer);
    FreePool(File2Buffer);
    CloseFile(File1);
    CloseFile(File2);
    return Status;
  }

  // Write result to result file
  if (Match) {
    Status = WriteFile(ResultFile, "Files match!\r\n", 15);
  } else {
    Status = WriteFile(ResultFile, "Files do not match!\r\n", 21);
  }

  if (EFI_ERROR(Status)) {
    Print(L"Failed to write result to file: %r\n", Status);
  }

  // Close files and free memory
  FreePool(File1Buffer);
  FreePool(File2Buffer);
  CloseFile(File1);
  CloseFile(File2);
  CloseFile(ResultFile);

  return Status;
}

这个示例代码会打开文件1和文件2，读取它们的内容并进行比较。如果两个文件的内容相同，会输出“Files match!”，否则会输出“Files do not match!”。然后，它会打开一个名为“result.txt”的新文件，并将对比结果写入该文件中。请注意，如果文件大小不同，则认为文件内容不匹配。这个示例代码还使用了一些之前提到过的函数，例如OpenFile()、CloseFile()、GetFileSize()、ReadFile()和WriteFile()，这些函数都是用来处理文件操作的。如果您需要在自己的代码中使用这些函数，请确保您已经正确包含了相关的头文件和库。