forked from samuel/go-gettext
/
mo.go
137 lines (120 loc) · 3.12 KB
/
mo.go
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
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
package gettext
import (
"bufio"
"bytes"
"encoding/binary"
"errors"
"io"
"net/textproto"
"strings"
)
const (
leMagic = 0x950412de
beMagic = 0xde120495
)
var (
ErrInvalidMagic = errors.New("magic has failed")
ErrTruncated = errors.New("truncated")
)
func ParsePO(r io.ReadSeeker) (*Catalog, error) {
var magic uint32
if err := binary.Read(r, binary.LittleEndian, &magic); err != nil {
return nil, err
}
var bo binary.ByteOrder
if magic == leMagic {
bo = binary.LittleEndian
} else if magic == beMagic {
bo = binary.BigEndian
} else {
return nil, ErrInvalidMagic
}
var version, stringCount, origOffset, transOffset uint32
if err := binary.Read(r, bo, &version); err != nil {
return nil, err
}
if err := binary.Read(r, bo, &stringCount); err != nil {
return nil, err
}
if err := binary.Read(r, bo, &origOffset); err != nil {
return nil, err
}
if err := binary.Read(r, bo, &transOffset); err != nil {
return nil, err
}
// TODO: Check version
stringOffsets := make([]struct{ origStart, origLen, transStart, transLen int32 }, stringCount)
if o, err := r.Seek(int64(origOffset), 0); err != nil {
return nil, err
} else if o != int64(origOffset) {
return nil, ErrTruncated
}
for i := 0; i < int(stringCount); i++ {
if err := binary.Read(r, bo, &stringOffsets[i].origLen); err != nil {
return nil, err
}
if err := binary.Read(r, bo, &stringOffsets[i].origStart); err != nil {
return nil, err
}
}
if o, err := r.Seek(int64(transOffset), 0); err != nil {
return nil, err
} else if o != int64(transOffset) {
return nil, ErrTruncated
}
for i := 0; i < int(stringCount); i++ {
if err := binary.Read(r, bo, &stringOffsets[i].transLen); err != nil {
return nil, err
}
if err := binary.Read(r, bo, &stringOffsets[i].transStart); err != nil {
return nil, err
}
}
catalog := Catalog{
Strings: make(map[string]*Translation, stringCount),
PluralFormula: GermanicPluralFormula,
}
for _, so := range stringOffsets {
if o, err := r.Seek(int64(so.origStart), 0); err != nil {
return nil, err
} else if o != int64(so.origStart) {
return nil, ErrTruncated
}
origBytes := make([]byte, so.origLen)
if _, err := r.Read(origBytes); err != nil {
return nil, err
}
if o, err := r.Seek(int64(so.transStart), 0); err != nil {
return nil, err
} else if o != int64(so.transStart) {
return nil, ErrTruncated
}
transBytes := make([]byte, so.transLen)
if _, err := r.Read(transBytes); err != nil {
return nil, err
}
if len(origBytes) == 0 {
// Translation meta header
header, err := textproto.NewReader(
bufio.NewReader(bytes.NewReader(transBytes))).ReadMIMEHeader()
if err != nil {
catalog.Header = header
} else {
catalog.Header = textproto.MIMEHeader(make(map[string][]string))
}
} else {
origParts := strings.Split(string(origBytes), "\x00")
transParts := strings.Split(string(transBytes), "\x00")
if len(transParts) > 0 {
t := &Translation{
Translation: transParts,
}
catalog.Strings[origParts[0]] = t
if len(origParts) > 1 {
t.Plural = origParts[1]
}
}
}
}
return &catalog, nil
}