[llvm-dev] Support/COFF.h NumberOfSections size-mismatch inside "header"-struct

Rohleder, Roman (Contractor) via llvm-dev llvm-dev at lists.llvm.org
Mon Oct 19 08:11:57 PDT 2015

Hello everyone,

while working on a simple PE-Parser, using the llvm/Support/COFF.h Header, to validate if a given File is a PE-File and to read the Machine Field I was experiencing some troubles.

It seemed the Fields were somehow misaligned and I could pinpoint the source of the misalignment to be the "NumberOfSections" field inside the "header"-struct (a.k.a. IMAGE_FILE_HEADER in winnt.h).

It is defined as "int32_t" in COFF.h, while in winnt.h it is defined as "WORD" and in the "Microsoft Portable Executable and Common Object File Format Specification", which is also cited on top of the COFF.h, also defines the Field to be 2 Bytes in Size.

A simple change to "uint16_t" did the trick.

Correct me if I am wrong, or if I was using it wrongly somehow.

Kind Regards


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