Signed-off-by: Pierre Curto <[email protected]>

Restore copyMatchTry4

In Go, `http.Request` requires an `io.ReadCloser` for an upload body. To
facilitate compression of data being uploaded we want to wrap a
source reader (such an `io.File`) with a proposed
`lz4.CompressingReader`, whereupon the said reader can be set directly
into `http.Request` Body field.

This benefits not only the plain `http.Request`, but also the various
network file storage APIs which build on top of Go's http client.

Signed-off-by: Alex Dubov <[email protected]>

Out buffer may have some stale overflow data on Reset.

Signed-off-by: Alex Dubov <[email protected]>

It is possible for out buffer to have no overflow data and yet
the read offset will be not zero (if byte slices passed by the reader
just happened to align perfectly).

Signed-off-by: Alex Dubov <[email protected]>

This allows compressing empty files, because without this change
the proper headers were not emitted when reading an empty file
via e.g. io.Copy().

Signed-off-by: Nikolay Edigaryev <[email protected]>

Writer: initialize the writer on Flush() if wasn't initialized before

Signed-off-by: Alex Dubov <[email protected]>

CompressingReader: compressed data reader stream (#210)

Update README.md: add @latest to cli install command

This fixes the tests and verifies that the fix from bc1239b, which
broke the tests, is no longer needed to conform to legacy compression.

Reverts bc1239b, no longer needed to conform to legacy