2020-12-16

UEFI Hexdump

If you're developing UEFI firmware content, sooner or later you're going to want to dump binary data using the debug facility.

And so, without further ado:

(...)

#include <Library/BaseLib.h>
#include <Library/PrintLib.h>

(...)

STATIC
VOID 
DumpBufferHex (
  VOID* Buf,
  UINTN Size
)
{
  UINT8* Buffer = (UINT8*)Buf;
  UINTN  i, j, k;
  char Line[80] = "";

  for (i = 0; i < Size; i += 16) {
    if (i != 0) {
      DEBUG ((DEBUG_INFO, "%a\n", Line));
    }
    Line[0] = 0;
    AsciiSPrint (&Line[AsciiStrLen (Line)], 80 - AsciiStrLen (Line), "  %08x  ", i);
    for (j = 0, k = 0; k < 16; j++, k++) {
      if (i + j < Size) {
        AsciiSPrint (&Line[AsciiStrLen (Line)], 80 - AsciiStrLen (Line), "%02x", Buffer[i + j]);
      } else {
        AsciiSPrint (&Line[AsciiStrLen (Line)], 80 - AsciiStrLen (Line), "  ");
      }
      AsciiSPrint (&Line[AsciiStrLen (Line)], 80 - AsciiStrLen (Line), " ");
    }
    AsciiSPrint (&Line[AsciiStrLen (Line)], 80 - AsciiStrLen (Line), " ");
    for (j = 0, k = 0; k < 16; j++, k++) {
      if (i + j < Size) {
        if ((Buffer[i + j] < 32) || (Buffer[ i + j] > 126)) {
          AsciiSPrint (&Line[AsciiStrLen (Line)], 80 - AsciiStrLen (Line), ".");
        } else {
          AsciiSPrint (&Line[AsciiStrLen (Line)], 80 - AsciiStrLen (Line), "%c", Buffer[i + j]);
        }
      }
    }
  }
  DEBUG ((DEBUG_INFO, "%a\n", Line));
}

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