Directory entry size validation

[DmitriyBerezin]

I use your amaizing module to uncompress zip archives from different sources. Archives may be produced via any compression tools and I don't exactly know which tool was used.

I've found a problem on some archives: readEntry() method fails on directory processing on entry size validation:

      if (entry.compressionMethod === 0) {
        if (entry.compressedSize !== entry.uncompressedSize) {
          var msg = "compressed/uncompressed size mismatch for stored file: " + entry.compressedSize + " != " + entry.uncompressedSize;
          return emitErrorAndAutoClose(self, new Error(msg));
        }
      }

Looks like some zip tool constantly set the following local headers for a directory entry:
compressionMethod: 0
compressedSize: 0
uncompressedSize: 4096

Unfortunatelly, I cannot provide zip example for this case because of sensitive data.

What do you think about some boolean option: validate size or skip validation? Or validate directory size or skip validation? If you accept this proposition I'll create pull request with my pleasure.

[thejoshwolfe]

Sorry for the delayed response.

That's unfortunate that you have to deal with malformed zipfiles of that nature, but I think you've got a good idea for disabling the validation checks. There's already a similar concept with the decodeStrings option, so I'm pretty comfortable going in that direction.

Please look at 4c0aef8 and let me know if that will solve your problem.

[thejoshwolfe]

the validateEntySizes option is now published in yauzl version 2.8