Supporting other compression methods (BZip2) about py7zr HOT 5 CLOSED

py7zr intend to support bzip2 compression method for 7zip format.
From your log, py7zr happily decode header information and start decompression.

An error you report is happend in

This means output data of bzip2 decompressor returns a zero size. I'm not sure a condition when it happened, and I don't have data to reproduce it.

If you can prepare minimum and small test archive to reproduce it, please upload to this report.

from py7zr.

Hi,

Here is the sample file: 10000SalesRecords.zip
I have zipped the 7z archive so I can able to upload here.

How did I created the sample .7z file and tested it:

1. Downloaded and decompressed sample .csv file http://eforexcel.com/wp/wp-content/uploads/2017/07/10000-Sales-Records.zip

2. On Win10 using 7-Zip software I compressed the file using BZip2 compression method
   

3. Tested the decompression on Fedora 31 and py7zr v0.6a1 release

Used code for testing:

import py7zr

archive = py7zr.SevenZipFile('10000SalesRecords.7z', mode='r')
print(archive.getnames())
print(archive.test())

Results:

['10000SalesRecords.csv']
Traceback (most recent call last):
File "decompress.py", line 7, in
print(archive.test())
File "/home/amarkus/.pyenv/versions/3.7.3/lib/python3.7/site-packages/py7zr/py7zr.py", line 688, in test
return self._test_digests()
File "/home/amarkus/.pyenv/versions/3.7.3/lib/python3.7/site-packages/py7zr/py7zr.py", line 528, in _test_digests
if self._test_unpack_digest():
File "/home/amarkus/.pyenv/versions/3.7.3/lib/python3.7/site-packages/py7zr/py7zr.py", line 520, in _test_unpack_digest
self.worker.extract(self.fp) # TODO: print progress
File "/home/amarkus/.pyenv/versions/3.7.3/lib/python3.7/site-packages/py7zr/compression.py", line 277, in extract
self.src_start + positions[i + 1])
File "/home/amarkus/.pyenv/versions/3.7.3/lib/python3.7/site-packages/py7zr/compression.py", line 307, in extract_single
self.decompress(fp, f.folder, fileish, f.uncompressed[-1], f.compressed, src_end)
File "/home/amarkus/.pyenv/versions/3.7.3/lib/python3.7/site-packages/py7zr/compression.py", line 335, in decompress
raise DecompressionError
py7zr.exceptions.DecompressionError

from py7zr.

Thank you for sharing test data! I can reproduce a problem, and I'd like to add this data as test case.

from py7zr.

Sure, feel free to add it to the test cases

from py7zr.

The case is solved and released.

from py7zr.