bsdiff

package module
Version: v1.0.5 Latest Latest
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Published: Mar 21, 2019 License: MIT Imports: 0 Imported by: 0

README

go-bsdiff

Pure Go implementation of bsdiff 4.

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bsdiff and bspatch are tools for building and applying patches to binary files. By using suffix sorting (specifically, Larsson and Sadakane's qsufsort) and taking advantage of how executable files change.

The package can be used as a library (pkg/bsdiff pkg/bspatch) or as a cli program (cmd/bsdiff cmd/bspatch).

As a library

Bsdiff Bytes
package main

import (
  "fmt"
  "bytes"

  "github.com/gabstv/go-bsdiff/pkg/bsdiff"
  "github.com/gabstv/go-bsdiff/pkg/bspatch"
)

func main(){
  // example files
  oldfile := []byte{0xfa, 0xdd, 0x00, 0x00, 0x00, 0x00, 0x00, 0xff}
  newfile := []byte{0xfa, 0xdd, 0x00, 0x00, 0x00, 0xee, 0xee, 0x00, 0x00, 0xff, 0xfe, 0xfe}

  // generate a BSDIFF4 patch
  patch, err := bsdiff.Bytes(oldfile, newfile)
  if err != nil {
    panic(err)
  }
  fmt.Println(patch)

  // Apply a BSDIFF4 patch
  newfile2, err := bspatch.Bytes(oldfile, patch)
  if err != nil {
    panic(err)
  }
  if !bytes.Equal(newfile, newfile2) {
    panic()
  }
}
Bsdiff Reader
package main

import (
  "fmt"
  "bytes"

  "github.com/gabstv/go-bsdiff/pkg/bsdiff"
  "github.com/gabstv/go-bsdiff/pkg/bspatch"
)

func main(){
  oldrdr := bytes.NewReader([]byte{0xfa, 0xdd, 0x00, 0x00, 0x00, 0x00, 0x00, 0xff})
  newrdr := bytes.NewReader([]byte{0xfa, 0xdd, 0x00, 0x00, 0x00, 0xee, 0xee, 0x00, 0x00, 0xff, 0xfe, 0xfe})
  patch := new(bytes.Buffer)

  // generate a BSDIFF4 patch
  if err := bsdiff.Reader(oldrdr, newrdr, patch); err != nil {
    panic(err)
  }

  newpatchedf := new(bytes.Buffer)
  oldrdr.Seek(0, 0)

  // Apply a BSDIFF4 patch
  if err := bspatch.Reader(oldrdr, newpatchedf, patch); err != nil {
    panic(err)
  }
  fmt.Println(newpatchedf.Bytes())
}

As a program (CLI)

go get -u -v github.com/gabstv/go-bsdiff/cmd/...

bsdiff oldfile newfile patch
bspatch oldfile newfile2 patch

Documentation

Overview

Package bsdiff is a pure Go implementation of Bsdiff 4.

Example:

package main

import (
  "fmt"
  "bytes"

  "github.com/gabstv/go-bsdiff/pkg/bsdiff"
  "github.com/gabstv/go-bsdiff/pkg/bspatch"
)

func main(){
  // example files
  oldfile := []byte{0xfa, 0xdd, 0x00, 0x00, 0x00, 0x00, 0x00, 0xff}
  newfile := []byte{0xfa, 0xdd, 0x00, 0x00, 0x00, 0xee, 0xee, 0x00, 0x00, 0xff, 0xfe, 0xfe}

  // generate a BSDIFF4 patch
  patch, err := bsdiff.Bytes(oldfile, newfile)
  if err != nil {
    panic(err)
  }
  fmt.Println(patch)

  // Apply a BSDIFF4 patch
  newfile2, err := bspatch.Bytes(oldfile, patch)
  if err != nil {
    panic(err)
  }
  if !bytes.Equal(newfile, newfile2) {
    panic()
  }
}

Source Files

Directories

Path Synopsis
cmd
pkg
bsdiff
Package bsdiff is a binary diff program using suffix sorting.
Package bsdiff is a binary diff program using suffix sorting.
bspatch
Package bspatch is a binary diff program using suffix sorting.
Package bspatch is a binary diff program using suffix sorting.

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