mirror of
https://github.com/go-gitea/gitea
synced 2024-12-24 17:44:27 +00:00
157 lines
2.8 KiB
Go
157 lines
2.8 KiB
Go
package mahonia
|
|
|
|
import (
|
|
"sync"
|
|
)
|
|
|
|
// Converters for GB18030 encoding.
|
|
|
|
func init() {
|
|
RegisterCharset(&Charset{
|
|
Name: "GB18030",
|
|
NewDecoder: func() Decoder {
|
|
gb18030Once.Do(buildGB18030Tables)
|
|
return decodeGB18030Rune
|
|
},
|
|
NewEncoder: func() Encoder {
|
|
gb18030Once.Do(buildGB18030Tables)
|
|
return encodeGB18030Rune
|
|
},
|
|
})
|
|
}
|
|
|
|
func decodeGB18030Rune(p []byte) (r rune, size int, status Status) {
|
|
if len(p) == 0 {
|
|
status = NO_ROOM
|
|
return
|
|
}
|
|
|
|
b := p[0]
|
|
if b < 128 {
|
|
return rune(b), 1, SUCCESS
|
|
}
|
|
|
|
if len(p) < 2 {
|
|
status = NO_ROOM
|
|
return
|
|
}
|
|
|
|
if p[0] < 0x81 || p[0] > 0xfe {
|
|
return 0xfffd, 1, INVALID_CHAR
|
|
}
|
|
|
|
if p[1] >= 0x40 {
|
|
// 2-byte character
|
|
c := uint16(p[0])<<8 + uint16(p[1])
|
|
r = rune(gbkToUnicode[c])
|
|
if r == 0 {
|
|
r = gbkToUnicodeExtra[c]
|
|
}
|
|
|
|
if r != 0 {
|
|
return r, 2, SUCCESS
|
|
}
|
|
} else if p[1] >= 0x30 {
|
|
// 4-byte character
|
|
if len(p) < 4 {
|
|
return 0, 0, NO_ROOM
|
|
}
|
|
if p[2] < 0x81 || p[2] > 0xfe || p[3] < 0x30 || p[3] > 0x39 {
|
|
return 0xfffd, 1, INVALID_CHAR
|
|
}
|
|
|
|
code := uint32(p[0])<<24 + uint32(p[1])<<16 + uint32(p[2])<<8 + uint32(p[3])
|
|
lin := gb18030Linear(code)
|
|
|
|
if lin <= maxGB18030Linear {
|
|
r = rune(gb18030LinearToUnicode[lin])
|
|
if r != 0 {
|
|
return r, 4, SUCCESS
|
|
}
|
|
}
|
|
|
|
for _, rng := range gb18030Ranges {
|
|
if lin >= rng.firstGB && lin <= rng.lastGB {
|
|
return rng.firstRune + rune(lin) - rune(rng.firstGB), 4, SUCCESS
|
|
}
|
|
}
|
|
}
|
|
|
|
return 0xfffd, 1, INVALID_CHAR
|
|
}
|
|
|
|
func encodeGB18030Rune(p []byte, r rune) (size int, status Status) {
|
|
if len(p) == 0 {
|
|
status = NO_ROOM
|
|
return
|
|
}
|
|
|
|
if r < 128 {
|
|
p[0] = byte(r)
|
|
return 1, SUCCESS
|
|
}
|
|
|
|
if len(p) < 2 {
|
|
status = NO_ROOM
|
|
return
|
|
}
|
|
|
|
var c uint16
|
|
if r < 0x10000 {
|
|
c = unicodeToGBK[r]
|
|
} else {
|
|
c = unicodeToGBKExtra[r]
|
|
}
|
|
|
|
if c != 0 {
|
|
p[0] = byte(c >> 8)
|
|
p[1] = byte(c)
|
|
return 2, SUCCESS
|
|
}
|
|
|
|
if len(p) < 4 {
|
|
return 0, NO_ROOM
|
|
}
|
|
|
|
if r < 0x10000 {
|
|
f := unicodeToGB18030[r]
|
|
if f != 0 {
|
|
p[0] = byte(f >> 24)
|
|
p[1] = byte(f >> 16)
|
|
p[2] = byte(f >> 8)
|
|
p[3] = byte(f)
|
|
return 4, SUCCESS
|
|
}
|
|
}
|
|
|
|
for _, rng := range gb18030Ranges {
|
|
if r >= rng.firstRune && r <= rng.lastRune {
|
|
lin := rng.firstGB + uint32(r) - uint32(rng.firstRune)
|
|
p[0] = byte(lin/(10*126*10)) + 0x81
|
|
p[1] = byte(lin/(126*10)%10) + 0x30
|
|
p[2] = byte(lin/10%126) + 0x81
|
|
p[3] = byte(lin%10) + 0x30
|
|
return 4, SUCCESS
|
|
}
|
|
}
|
|
|
|
p[0] = 0x1a
|
|
return 1, INVALID_CHAR
|
|
}
|
|
|
|
var gb18030Once sync.Once
|
|
|
|
// Mapping from gb18039Linear values to Unicode.
|
|
var gb18030LinearToUnicode []uint16
|
|
|
|
var unicodeToGB18030 []uint32
|
|
|
|
func buildGB18030Tables() {
|
|
gb18030LinearToUnicode = make([]uint16, maxGB18030Linear+1)
|
|
unicodeToGB18030 = make([]uint32, 65536)
|
|
for _, data := range gb18030Data {
|
|
gb18030LinearToUnicode[gb18030Linear(data.gb18030)] = data.unicode
|
|
unicodeToGB18030[data.unicode] = data.gb18030
|
|
}
|
|
}
|