Compression decoders read from one input stream (an io_reader called src)
and write to an output stream (an io_writer called dst). Wuffs'
implementations have one key method: transform_io. It incrementally
decompresses the source data.
This method is a coroutine, and does not require
either all of the input or all of the output to fit in a single contiguous
buffer. It can suspend with the $short_read or $short_write
statuses when the src buffer needs re-filling or the
dst buffer needs flushing. For an example, look at the
example/zcat program, which uses fixed size buffers,
but reads arbitrarily long compressed input from stdin and writes arbitrarily
long decompressed output to stdout.
TODO: standardize the various dictionary APIs, after Wuffs v0.2 is released.
See also the general remarks on Wuffs' standard library.