"zlib.error: Error -5 while decompressing data: incomplete or truncated stream" from specific BIOS about psptool

[RobertBuhren]

Sorry for the late reply. I believe there is something wrong with some of the entries of that image. Looking at the header of the entries that fail to decompress, I can see that the header says they're compressed (offset 0x48). However, the body data does not look compressed at all.

I have added a warning to PSPtool that allows to continue extracting entries regardless of a failed zlib decompression. If an entry can't be decompressed, the orginal bytes are extracted instead.

I'll keep this issue open for now, in case we stumble on other UEFI images with the same weird behavior.

Regards,

Robret

[thehans]

Thanks, I looked at the output from this latest change in a hex editor and it seems that there is still compressed data (magic bytes 78 DA), but it starts at 0x100 offset into what was extracted (eg file: 0x1100064_0.0.10.0)

I have mostly moved on from being interested in this BIOS, since I've replaced the board with a better model. But still willing to test out stuff if there's anything I can help with to make the tool more robust.

Edit:
Full list of warnings on this file, just for reference

Warning: ZLIB decompression faild on entry 0x1100064                                        
Warning: ZLIB decompression faild on entry 0x1100064                       
Warning: ZLIB decompression faild on entry 0x1400064                                        
Warning: ZLIB decompression faild on entry 0x1400064                       
Warning: ZLIB decompression faild on entry 0x1400065                                        
Warning: ZLIB decompression faild on entry 0x1400065                       
Warning: ZLIB decompression faild on entry 0x1100065                                        
Warning: ZLIB decompression faild on entry 0x1100065 

[thehans]

BTW not sure what it means but I see two files in output that start with "0x1100064"
0x1100064_0.0.10.0 mentioned above
and
0x1100064_0.0.18.5 which i guess is the part that's not compressed?

[RobertBuhren]

I just pushed some more fixes to psptool. The zlib decompression now works with this image too.

Thanks for reporting this issue.