Corrupted files extracted from PPMd ZIP archive

[ristiisa]

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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

[brendan-duncan]

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

[ristiisa]

I tried 53e1773d8e18191d6e3fea2136ba61806b7e925d and it produces similar corrupted result. Also similar results with LZMA and BZip2.

[brendan-duncan]

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

[brendan-duncan]

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

[ristiisa]

You can use 7zip client for that

[brendan-duncan]

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

[ristiisa]

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

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

[brendan-duncan]

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

[brendan-duncan]

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