mirror of
https://github.com/golang/go
synced 2024-10-07 05:21:22 -06:00
d65a5cce89
parsing and printing to new syntax. Use -oldparser to parse the old syntax, use -oldprinter to print the old syntax. 2) Change default gofmt formatting settings to use tabs for indentation only and to use spaces for alignment. This will make the code alignment insensitive to an editor's tabwidth. Use -spaces=false to use tabs for alignment. 3) Manually changed src/exp/parser/parser_test.go so that it doesn't try to parse the parser's source files using the old syntax (they have new syntax now). 4) gofmt -w src misc test/bench 4th set of files. R=rsc CC=golang-dev https://golang.org/cl/180049
122 lines
2.7 KiB
Go
122 lines
2.7 KiB
Go
// Copyright 2009 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package patch
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import (
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"bytes"
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"compress/zlib"
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"crypto/sha1"
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"encoding/git85"
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"fmt"
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"io"
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"os"
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)
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func gitSHA1(data []byte) []byte {
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if len(data) == 0 {
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// special case: 0 length is all zeros sum
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return make([]byte, 20)
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}
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h := sha1.New()
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fmt.Fprintf(h, "blob %d\x00", len(data))
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h.Write(data)
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return h.Sum()
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}
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// BUG(rsc): The Git binary delta format is not implemented, only Git binary literals.
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// GitBinaryLiteral represents a Git binary literal diff.
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type GitBinaryLiteral struct {
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OldSHA1 []byte // if non-empty, the SHA1 hash of the original
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New []byte // the new contents
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}
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// Apply implements the Diff interface's Apply method.
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func (d *GitBinaryLiteral) Apply(old []byte) ([]byte, os.Error) {
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if sum := gitSHA1(old); !bytes.HasPrefix(sum, d.OldSHA1) {
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return nil, ErrPatchFailure
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}
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return d.New, nil
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}
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func unhex(c byte) uint8 {
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switch {
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case '0' <= c && c <= '9':
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return c - '0'
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case 'a' <= c && c <= 'f':
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return c - 'a' + 10
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case 'A' <= c && c <= 'F':
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return c - 'A' + 10
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}
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return 255
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}
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func getHex(s []byte) (data []byte, rest []byte) {
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n := 0
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for n < len(s) && unhex(s[n]) != 255 {
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n++
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}
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n &^= 1 // Only take an even number of hex digits.
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data = make([]byte, n/2)
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for i := range data {
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data[i] = unhex(s[2*i])<<4 | unhex(s[2*i+1])
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}
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rest = s[n:]
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return
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}
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// ParseGitBinary parses raw as a Git binary patch.
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func ParseGitBinary(raw []byte) (Diff, os.Error) {
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var oldSHA1, newSHA1 []byte
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var sawBinary bool
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for {
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var first []byte
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first, raw, _ = getLine(raw, 1)
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first = bytes.TrimSpace(first)
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if s, ok := skip(first, "index "); ok {
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oldSHA1, s = getHex(s)
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if s, ok = skip(s, ".."); !ok {
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continue
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}
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newSHA1, s = getHex(s)
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continue
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}
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if _, ok := skip(first, "GIT binary patch"); ok {
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sawBinary = true
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continue
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}
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if n, _, ok := atoi(first, "literal ", 10); ok && sawBinary {
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data := make([]byte, n)
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d := git85.NewDecoder(bytes.NewBuffer(raw))
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z, err := zlib.NewInflater(d)
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if err != nil {
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return nil, err
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}
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defer z.Close()
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if _, err = io.ReadFull(z, data); err != nil {
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if err == os.EOF {
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err = io.ErrUnexpectedEOF
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}
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return nil, err
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}
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var buf [1]byte
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m, err := z.Read(&buf)
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if m != 0 || err != os.EOF {
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return nil, os.NewError("Git binary literal longer than expected")
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}
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if sum := gitSHA1(data); !bytes.HasPrefix(sum, newSHA1) {
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return nil, os.NewError("Git binary literal SHA1 mismatch")
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}
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return &GitBinaryLiteral{oldSHA1, data}, nil
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}
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if !sawBinary {
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return nil, os.NewError("unexpected Git patch header: " + string(first))
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}
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}
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panic("unreachable")
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}
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