ydb/vendor/github.com/klauspost/compress/snappy/snappy.go

// Copyright 2011 The Snappy-Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

// Package snappy implements the Snappy compression format. It aims for very
// high speeds and reasonable compression.
//
// There are actually two Snappy formats: block and stream. They are related,
// but different: trying to decompress block-compressed data as a Snappy stream
// will fail, and vice versa. The block format is the Decode and Encode
// functions and the stream format is the Reader and Writer types.
//
// The block format, the more common case, is used when the complete size (the
// number of bytes) of the original data is known upfront, at the time
// compression starts. The stream format, also known as the framing format, is
// for when that isn't always true.
//
// The canonical, C++ implementation is at https://github.com/google/snappy and
// it only implements the block format.
package snappy

/*
Each encoded block begins with the varint-encoded length of the decoded data,
followed by a sequence of chunks. Chunks begin and end on byte boundaries. The
first byte of each chunk is broken into its 2 least and 6 most significant bits
called l and m: l ranges in [0, 4) and m ranges in [0, 64). l is the chunk tag.
Zero means a literal tag. All other values mean a copy tag.

For literal tags:
  - If m < 60, the next 1 + m bytes are literal bytes.
  - Otherwise, let n be the little-endian unsigned integer denoted by the next
    m - 59 bytes. The next 1 + n bytes after that are literal bytes.

For copy tags, length bytes are copied from offset bytes ago, in the style of
Lempel-Ziv compression algorithms. In particular:
  - For l == 1, the offset ranges in [0, 1<<11) and the length in [4, 12).
    The length is 4 + the low 3 bits of m. The high 3 bits of m form bits 8-10
    of the offset. The next byte is bits 0-7 of the offset.
  - For l == 2, the offset ranges in [0, 1<<16) and the length in [1, 65).
    The length is 1 + m. The offset is the little-endian unsigned integer
    denoted by the next 2 bytes.
  - For l == 3, this tag is a legacy format that is no longer issued by most
    encoders. Nonetheless, the offset ranges in [0, 1<<32) and the length in
    [1, 65). The length is 1 + m. The offset is the little-endian unsigned
    integer denoted by the next 4 bytes.
*/