Introduce ZipStreamDecompressor, to support streaming of PKZIP files

[don-clugston-sociomantic]

The existing ZlibStreamDecompressor supports streaming of gzip files. This module extends that class to also support streamable pkzip files. User code does not need to know if it is processing a gzip or a pkzip archive; they are treated identically.

Streaming of PKZIP files isn't actually possible, but this module does it anyway :smile:

In practice it works for pretty much any zip file that has only a single file inside it. The weakness of the pkzip format is that it is not possible to know if you have a pathological case until you have received the entire archive. So if faced with a pathological case, it will just throw an exception.

[codecov[bot]]

Codecov Report

Merging #796 into v5.3.x will increase coverage by 0.04%. The diff coverage is 83.51%.

[ben-palmer-sociomantic]

Should this target v5.x.x?

[don-clugston-sociomantic]

Should this target v5.x.x?

Dunno. The problem is, there is an important commit in v5.3.x which isn't in v5.x.x. I don't know which of these branches is actually the head.

[ben-palmer-sociomantic]

Dunno. The problem is, there is an important commit in v5.3.x which isn't in v5.x.x. I don't know which of these branches is actually the head.

Oops, that was a mistake that should now be fixed.

[don-clugston-sociomantic]

Changed to v5.x.x, now that the branches have been harmonised.

[stefan-koch-sociomantic]

This looks good to me!