DeflateDecoder truncates output when underlying reader returns single bytes

[programmerjake]

test program: https://play.rust-lang.org/?gist=f944dbb26d6cd8afb4e866359d9b9e2f&version=stable&mode=debug&edition=2015
https://gist.github.com/f944dbb26d6cd8afb4e866359d9b9e2f

[programmerjake]

I would expect the test program to print "Test" twice.

[programmerjake]

the issue still exists in version 0.4.5

[philipc]

The problem is:

• BufReader::fill_buf will only read 1 byte
• InflateStream::update can't make progress with 1 byte input, and so returns 0 byte output
• thus DeflateDecoderBuf::read will return 0 bytes signifying EOF and Bytes::next will return None

We can't even fix this by calling BufReader:fill_buf again because it only reads when the buffer is empty.

So in my opinion, DeflateDecoderBuf needs to be rewritten without using BufReader. This isn't something I plan to work on.