mirror of
https://github.com/bluekeyes/go-gitdiff
synced 2026-06-08 13:18:30 +00:00
Billy Keyes
071689e91f
The previous version of the golangci-lint action would install its own version of Go, which eventually conflicted with the old pinned version of the linter I was using. Upgrade the action to avoid this, but also update Go and the linter while I'm here.
125 lines
2.5 KiB
Go
125 lines
2.5 KiB
Go
//go:build ignore
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// bin.go is a helper CLI to manipulate binary diff data for testing purposes.
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// It can decode patches generated by git using the standard parsing functions
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// or it can encode binary data back into the format expected by Git. It
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// operates on stdin writes results (possibly binary) to stdout.
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package main
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import (
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"bytes"
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"compress/zlib"
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"encoding/binary"
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"flag"
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"io/ioutil"
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"log"
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"os"
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"strings"
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"github.com/bluekeyes/go-gitdiff/gitdiff"
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)
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var (
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b85Powers = []uint32{52200625, 614125, 7225, 85, 1}
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b85Alpha = []byte(
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"0123456789" + "ABCDEFGHIJKLMNOPQRSTUVWXYZ" + "abcdefghijklmnopqrstuvwxyz" + "!#$%&()*+-;<=>?@^_`{|}~",
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)
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)
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var mode string
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func base85Encode(data []byte) []byte {
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chunks, remaining := len(data)/4, len(data)%4
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if remaining > 0 {
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data = append(data, make([]byte, 4-remaining)...)
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chunks++
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}
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var n int
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out := make([]byte, 5*chunks)
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for i := 0; i < len(data); i += 4 {
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v := binary.BigEndian.Uint32(data[i : i+4])
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for j := 0; j < 5; j++ {
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p := v / b85Powers[j]
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out[n+j] = b85Alpha[p]
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v -= b85Powers[j] * p
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}
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n += 5
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}
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return out
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}
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func compress(data []byte) ([]byte, error) {
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var b bytes.Buffer
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w := zlib.NewWriter(&b)
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if _, err := w.Write(data); err != nil {
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return nil, err
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}
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if err := w.Close(); err != nil {
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return nil, err
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}
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return b.Bytes(), nil
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}
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func wrap(data []byte) string {
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var s strings.Builder
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for i := 0; i < len(data); i += 52 {
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c := 52
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if c > len(data)-i {
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c = len(data) - i
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}
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b := (c / 5) * 4
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if b <= 26 {
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s.WriteByte(byte('A' + b - 1))
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} else {
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s.WriteByte(byte('a' + b - 27))
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}
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s.Write(data[i : i+c])
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s.WriteByte('\n')
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}
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return s.String()
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}
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func init() {
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flag.StringVar(&mode, "mode", "parse", "operation mode, one of 'parse' or 'encode'")
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}
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func main() {
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flag.Parse()
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switch mode {
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case "parse":
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files, _, err := gitdiff.Parse(os.Stdin)
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if err != nil {
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log.Fatalf("failed to parse file: %v", err)
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}
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if len(files) != 1 {
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log.Fatalf("patch contains more than one file: %d", len(files))
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}
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if files[0].BinaryFragment == nil {
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log.Fatalf("patch file does not contain a binary fragment")
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}
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os.Stdout.Write(files[0].BinaryFragment.Data)
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case "encode":
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data, err := ioutil.ReadAll(os.Stdin)
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if err != nil {
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log.Fatalf("failed to read input: %v", err)
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}
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data, err = compress(data)
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if err != nil {
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log.Fatalf("failed to compress data: %v", err)
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}
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os.Stdout.WriteString(wrap(base85Encode(data)))
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default:
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log.Fatalf("unknown mode: %s", mode)
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}
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}
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