[Bug]: Reading binary stream to determine file format code reading data exception

[psvajaz]

bit7z version

4.0.x RC

Compilation options

BIT7Z_AUTO_FORMAT, BIT7Z_AUTO_PREFIX_LONG_PATHS

7-zip version

v22.01

7-zip shared library used

7z.dll / 7z.so

Compilers

MSVC

Compiler versions

MSVC2017

Architecture

x86

Operating system

Windows

Operating system versions

Windows 11

Bug description

bitinputarchive.cpp -> openArchive -> Streamfile_stream = bit7z::make_com< CFileInStream, IInStream >( arc_path );
bitexception.cpp -> CFileInStream > mFileStream.rdbuf()->pubsetbuf( mBuffer.data(), buffer_size );
Loading file binary to mBuffer is all 0x00.

mFileStream.rdbuf()->pubsetbuf( mBuffer.data(), buffer_size );
modify to
mFileStream.read(mBuffer.data(), buffer_size);
is ok.

but return to readSignature is all 0x00

Steps to reproduce

No response

Expected behavior

No response

Relevant compilation output

No response

Code of Conduct

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[rikyoz]

Hi!

Sorry, could you give more details on the issue? What are you trying to achieve?
Thanks!

mFileStream.rdbuf()->pubsetbuf( mBuffer.data(), buffer_size );
modify to
mFileStream.read(mBuffer.data(), buffer_size);
is ok.
but return to readSignature is all 0x00

The code mFileStream.rdbuf()->pubsetbuf( mBuffer.data(), buffer_size ); in CFileInStream's constructor is correct.
In the constructor, we are not trying to read the file; rather, we are setting the buffer that will be used for the subsequent read operations performed by 7-zip.