Corrupted files extracted from PPMd ZIP archive

Question

Corrupted files extracted from PPMd ZIP archive

Opened this issue a year ago · 9 comments

It seems that some files will get corrupted when unpacking a zip archive with PPMd compression method.

import 'package:archive/archive_io.dart';
final inputStream = InputFileStream('test.zip');
final archive = ZipDecoder().decodeBuffer(inputStream);

main() => extractArchiveToDisk(archive, 'test');

test.zip

Answer 1 · 2023-09-11T21:45:34.000Z

I did just fix a bug in extractFileToDisk 3.3.9, I wonder if it would fix this issue.

Answer 2 · 2023-09-12T07:10:01.000Z

I tried 53e1773 and it produces similar corrupted result. Also similar results with LZMA and BZip2.

Answer 3 · 2023-09-12T19:34:19.000Z

Thanks for the confirmation. I'll take a look.

Answer 4 · 2023-09-13T02:37:11.000Z

Looking more closely at what your question was, I realize it's about PPMd compression. Unfortunately I don't have a PPMd decompressor.

Answer 5 · 2023-09-13T06:18:28.000Z

You can use 7zip client for that

Answer 6 · 2023-09-13T16:03:54.000Z

I mean the library doesn't have PPMd decompression code.

Answer 7 · 2023-09-14T10:29:11.000Z

I mean the library doesn't have PPMd decompression code.

In that case perhaps the file signature should be checked to avoid corrupted data.

Answer 8 · 2023-09-17T17:55:54.000Z

I'll see if I can add error checking for that.

Answer 9 · 2023-09-23T16:55:51.000Z

In 3.4.2 it will throw an exception if you try to decompress an unsupported compression type, including PPMd.