GzipReader does not read concatenated gzip files

[AlexMooney]

According to the gzip docs, concatenated gzip files should decompress the same as a single gzip made from the concatenated contents of the files.

Using GzipReader, only the first gzip member is decompressed. I've made a gist which reproduces the problem.

[Vince-Smith]

This issue is 6 years old at this point. A patch was presented and subsequently rejected. I don't get it, there are legitimate use cases for this feature even if they aren't that common.

[jeremyevans]

matz rejected my idea for Zlib::GzipReader.each_file. I've offered an alternative approach that adds Zlib::GzipReader.zcat in #13. It will be discussed at the next Ruby developer meeting.

[jeremyevans]

Zlib::GzipReader.zcat has been added by e2ce56d to meet this need.