Help us shape the future of Go! Take the 2026 Go Developer Survey

Why Go
- Case Studies
  
  Common problems companies solve with Go
- Use Cases
  
  Stories about how and why companies use Go
- Security
  
  How Go can help keep you secure by default
Learn
Docs
- Effective Go
  
  Tips for writing clear, performant, and idiomatic Go code
- Go User Manual
  
  A complete introduction to building software with Go
- Standard library
  
  Reference documentation for Go's standard library
- Release Notes
  
  Learn what's new in each Go release
- API
  
  Reference documentation for the pkg.go.dev API
Packages
Community
- Recorded Talks
  
  Videos from prior events
- Meetups
  
  Meet other local Go developers
- Conferences
  
  Learn and network with Go developers from around the world
- Go blog
  
  The Go project's official blog.
- Go project
  
  Get help and stay informed from Go
- Get connected

delta

package module

Go to main page

Versions in this module

v0

v0.4.7

Oct 22, 2026

Changes in this version

+ const CHAR_OFFSET

+ const CHUNK_SIZE

+ func ApplyDelta(basisFile []byte, insts []MatchResult, blockSize int32, algo string) ([]byte, error)

+ func ApplyDeltaStream(basisFile []byte, r io.Reader, w io.Writer, blockSize int32, algo string) error

+ func CalculateBlockSize(fileSize int64) int32

+ func Checksum1(data []byte) uint32

+ func Checksum1AVX512(data []byte) uint32 — darwin/amd64, linux/amd64, windows/amd64

+ func Checksum1Components(data []byte) (s1, s2 uint32)

+ func DecodeInstructionsStream(r io.Reader, fn func(inst MatchResult) error) error

+ func DecodeInstructionsStreamAll(r io.Reader, fn func(inst MatchResult) error) error

+ func DeltaFromWire(r io.Reader, newFile []byte, algo string) ([]MatchResult, *MatchEngine, error)

+ func DeltaFromWireStream(sigR io.Reader, newR io.Reader, newFileSize int64, algo string, ...) error

+ func DeltaStream(oldFile []byte, newFileR io.Reader, newFileSize int64, blockSize int32, ...) error

+ func GetDefault() string

+ func ListAlgos() []string

+ func MD5x16CoreForBench(x *[16][16]uint32, state *[4][16]uint32) — darwin/amd64, linux/amd64, windows/amd64

+ func MD5x16available() bool

+ func MD5x8CoreForBench(x *[16][8]uint32, state *[4][8]uint32) — darwin/amd64, linux/amd64, windows/amd64

+ func NewHash(algoName string) (hash.Hash, error)

+ func Register(algo ChecksumAlgo)

+ func RoundTrip(oldFile, newFile []byte, blockSize int32, algo string) ([]byte, error)

+ func SHA256x8Available() bool

+ func SetDefault(name string) error

+ func WireEncodeInstructions(w io.Writer, insts []MatchResult) error

+ func WireEncodeSignature(w io.Writer, sig *Signature) error

+ type BlockSum struct

+ Index int

+ Length int32

+ Offset int64

+ Sum1 uint32

+ Sum2 []byte

+ type ChecksumAlgo struct

+ FastSum func(out, data []byte) []byte

+ Length int

+ Name string

+ New func() hash.Hash

+ func GetAlgo(name string) (ChecksumAlgo, error)

+ func MustGet(name string) ChecksumAlgo

+ type MatchEngine struct

+ FalseAlarms int

+ HashHits int

+ LiteralBytes int64

+ Matches int

+ func NewMatchEngine(blockSize int32, strongAlgo string) (*MatchEngine, error)

+ func (me *MatchEngine) LoadSignature(sig *Signature)

+ func (me *MatchEngine) Search(data []byte) []MatchResult

+ func (me *MatchEngine) SearchParallel(data []byte, numWorkers int) []MatchResult

+ func (me *MatchEngine) SearchReader(r io.Reader, fileSize int64, fn func(MatchResult) error) error

+ func (me *MatchEngine) SearchReaderParallel(r io.Reader, fileSize int64, windowSize, workers int, ...) error

+ type MatchResult struct

+ BlockIdx int

+ Data []byte

+ IsLiteral bool

+ Offset int64

+ func Delta(oldFile, newFile []byte, blockSize int32, algo string) ([]MatchResult, error)

+ func WireDecodeInstructions(r io.Reader) ([]MatchResult, error)

+ type Reconstructor struct

+ func NewReconstructor(basisFile []byte, blockSize int32, strongAlgo string, blockLens ...[]int32) (*Reconstructor, error)

+ func (rc *Reconstructor) Reconstruct(instructions []MatchResult) ([]byte, error)

+ func (rc *Reconstructor) Verify(result []byte, expectedSum []byte) bool

+ func (rc *Reconstructor) WriteInstruction(w io.Writer, inst MatchResult) error

+ type RollingSum struct

+ func NewRollingSum(data []byte) *RollingSum

+ func (rs *RollingSum) Reset(data []byte)

+ func (rs *RollingSum) Roll(oldByte, newByte byte, blockLen int32)

+ func (rs *RollingSum) S1() uint32

+ func (rs *RollingSum) S2() uint32

+ func (rs *RollingSum) Value() uint32

+ type Signature struct

+ BlockSize int32

+ BlockSums []BlockSum

+ FileSize int64

+ func GenerateSignature(data []byte, blockSize int32, strongAlgo string) *Signature

+ func GenerateSignatureParallel(data []byte, blockSize int32, strongAlgo string) (*Signature, error)

+ func GenerateSignatureReader(r io.Reader, fileSize int64, blockSize int32, strongAlgo string) (*Signature, error)

+ func WireDecodeSignature(r io.Reader) (*Signature, error)