1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
|
/* Copyright (C) 2021 Nicolas Peugnet <n.peugnet@free.fr>
This file is part of dna-backup.
dna-backup is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
dna-backup is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with dna-backup. If not, see <https://www.gnu.org/licenses/>. */
package delta
import (
"fmt"
"io"
"github.com/gabstv/go-bsdiff/pkg/bsdiff"
"github.com/gabstv/go-bsdiff/pkg/bspatch"
"github.com/mdvan/fdelta"
)
type Differ interface {
Diff(source io.Reader, target io.Reader, patch io.Writer) error
}
type Patcher interface {
Patch(source io.Reader, target io.Writer, patch io.Reader) error
}
type Bsdiff struct{}
func (Bsdiff) Diff(source io.Reader, target io.Reader, patch io.Writer) error {
return bsdiff.Reader(source, target, patch)
}
func (Bsdiff) Patch(source io.Reader, target io.Writer, patch io.Reader) error {
return bspatch.Reader(source, target, patch)
}
type Fdelta struct{}
func (Fdelta) Diff(source io.Reader, target io.Reader, patch io.Writer) error {
sourceBuf, err := io.ReadAll(source)
if err != nil {
return err
}
targetBuf, err := io.ReadAll(target)
if err != nil {
return err
}
_, err = patch.Write(fdelta.Create(sourceBuf, targetBuf))
return err
}
func (Fdelta) Patch(source io.Reader, target io.Writer, patch io.Reader) error {
sourceBuf, err := io.ReadAll(source)
if err != nil {
return fmt.Errorf("source read all: %s", err)
}
patchBuf, err := io.ReadAll(patch)
if err != nil {
return fmt.Errorf("patch read all: %s", err)
}
targetBuf, err := fdelta.Apply(sourceBuf, patchBuf)
if err != nil {
return fmt.Errorf("apply patch: %s", err)
}
_, err = target.Write(targetBuf)
return err
}
|
