Problems with extracting multi-volume

chaseYLC commented 3 years ago

bug

Fails to extract files created by applying mult-volume.

Env

Windows 10
x86
msvc 2019
bit7z : v3.1.2
7-zip : v16.04

Details

I set the volume size of 10mb

compressor.setVolumeSize(1024 * 1024 * 10);

Files smaller than the volume size were successfully extracted. ('myfile.001' file only ). However, extract fails when multiple files are created. ('myfiles.001 ... myfiles.021')

Extraction by programming fails, but Extraction succeeds when an external 7z program is used. So I think compression is not a problem.

The code where the failure occurs is this:

IInArchive* BitInputArchive::openArchiveStream( const BitArchiveHandler& handler,
                                                const wstring& name,
                                                IInStream* in_stream ) {

    ... 

    // Trying to open the file with the detected format
    HRESULT res = in_archive->Open( in_stream, nullptr, open_callback );

    ...    

}

res is S_FALSE !!

rikyoz commented 3 years ago

Hi! Strange, I don't seem to have any problem with the extraction of multi-volume archives. Just two questions:

What archive format do you use for the compression?
What archive format do you use when extracting the archive?

Please note that even though you used a format like BitFormat::SevenZip for compressing the multi-volume archive, you need to use the BitFormat::Split format for extracting it!

chaseYLC commented 3 years ago

Thank you. It was caused by not using "BitFormat::Split". I didn't know I had to get 1 archive using "BitFormat::Split" .

rikyoz commented 3 years ago

No problem! Yeah, I definitely need to better document this detail! Thank you anyway for using bit7z!

rikyoz / bit7z

Problems with extracting multi-volume #49