[PATCH] BaseTools/VolInfo: Correct buffer for GenCrc32 tool

["Konstantin Aladyshev" <aladyshev22@gmail.com>]

If the guided section was encoded with GenCrc32 tool the resulting
'EFI_GUID_DEFINED_SECTION.DataOffset' field points to the start of
the meaningfull data that follows the CRC32 value.
But if we want to decode the section with GenCrc32 tool we need to
provide a buffer that includes the CRC32 value itself.

Signed-off-by: Konstantin Aladyshev <aladyshev22@gmail.com>
---
 BaseTools/Source/C/VolInfo/VolInfo.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/BaseTools/Source/C/VolInfo/VolInfo.c b/BaseTools/Source/C/VolInfo/VolInfo.c
index f450796f9c..47a8f80f46 100644
--- a/BaseTools/Source/C/VolInfo/VolInfo.c
+++ b/BaseTools/Source/C/VolInfo/VolInfo.c
@@ -1999,6 +1999,13 @@ Returns:
           );
         free (ExtractionTool);
 
+        if (!CompareGuid (
+               EfiGuid,
+               &gEfiCrc32GuidedSectionExtractionProtocolGuid
+               )
+           ) {
+          DataOffset -= 4;
+        }
         Status =
           PutFileImage (
             ToolInputFile,
-- 
2.25.1