Add support for deflate64

[malaterre]

Starring at the source code, it seems that there is no support for deflate64:

• https://github.com/gildas-lormeau/zip.js/blob/master/lib/core/constants.js#L31-L32

and

• https://github.com/gildas-lormeau/zip.js/blob/master/lib/core/zip-reader.js#L416-L418

Would you consider adding minimal decompression support for deflate64 in the future ?

References:

• unsupported compression method: 9 thejoshwolfe/yauzl#58
• Support for Deflate64 compressed files nih-at/libzip#116
• https://pypi.org/project/zipfile-deflate64/

[gildas-lormeau]

As mentioned in the first link you referenced, the DEFLATE64 algorithm is proprietary. The consequence is that it can only be implemented in an open-source project for reading zip files, as far as I know (cf. the zlib project).

Personally, I don't have the time (and motivation TBH) to implement this feature. However, any contribution is of course welcome :)