compressor

package

v1.53.0 Latest Latest Go to latest Published: Mar 4, 2024 License: Apache-2.0 Imports: 12 Imported by: 1

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Package rollsum implements rolling checksums similar to apenwarr's bup, which is similar to librsync.

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const (
	RollsumBits = 16
)

This section is empty.

func ZstdCompressor(r io.Writer, metadata map[string]string, level *int) (io.WriteCloser, error)

ZstdCompressor is a CompressorFunc for the zstd compression algorithm.

type RollSum struct {
	// contains filtered or unexported fields
}

func NewRollSum() *RollSum

func (rs *RollSum) Bits() int

func (rs *RollSum) Digest() uint32

func (rs *RollSum) OnSplit() bool

OnSplit reports whether at least 13 consecutive trailing bits of the current checksum are set the same way.

func (rs *RollSum) OnSplitWithBits(n uint32) bool

OnSplitWithBits reports whether at least n consecutive trailing bits of the current checksum are set the same way.

func (rs *RollSum) Roll(ch byte)

Roll adds ch to the rolling sum.