Struct decompressor

flate/inflate.go:310–350

Decompress state.

// Decompress state.
type decompressor struct {
	// Input source.
	r       Reader
	roffset int64

	// Huffman decoders for literal/length, distance.
	h1, h2 huffmanDecoder

	// Length arrays used to define Huffman codes.
	bits     *[maxNumLit + maxNumDist]int
	codebits *[numCodes]int

	// Output history, buffer.
	dict dictDecoder

	// Next step in the decompression,
	// and decompression state.
	step      step
	stepState int
	err       error
	toRead    []byte
	hl, hd    *huffmanDecoder
	copyLen   int
	copyDist  int

	// Temporary buffer (avoids repeated allocation).
	buf [4]byte

	// Input bits, in top of b.
	b uint32

	nb    uint
	final bool

	flushMode flushMode
	cb        func(InflateCheckpoint)
	cp        InflateCheckpoint
	hasCP     bool  // WithResumeFrom was supplied
	uncOffset int64 // baseline uncompressed offset (from a resume checkpoint)
	cpBuf     []byte
}

func (f *decompressor) nextBlock() {
	for f.nb < 1+2 {