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gitea/modules/mahonia/euc-jp.go
2014-09-07 19:58:01 -04:00

103 lines
1.7 KiB
Go

package mahonia
import (
"unicode/utf8"
)
// Converters for the EUC-JP encoding
func init() {
RegisterCharset(&Charset{
Name: "EUC-JP",
Aliases: []string{"extended_unix_code_packed_format_for_japanese", "cseucpkdfmtjapanese"},
NewDecoder: func() Decoder {
return decodeEucJP
},
NewEncoder: func() Encoder {
jis0208Table.Reverse()
jis0212Table.Reverse()
return encodeEucJP
},
})
}
func decodeEucJP(p []byte) (c rune, size int, status Status) {
if len(p) == 0 {
return 0, 0, NO_ROOM
}
b := p[0]
switch {
case b < 0x80:
return rune(b), 1, SUCCESS
case b == 0x8e:
if len(p) < 2 {
return 0, 0, NO_ROOM
}
b2 := p[1]
if b2 < 0xa1 || b2 > 0xdf {
return utf8.RuneError, 1, INVALID_CHAR
}
return rune(b2) + (0xff61 - 0xa1), 2, SUCCESS
case b == 0x8f:
if len(p) < 3 {
return 0, 0, NO_ROOM
}
c, size, status = jis0212Table.DecodeHigh(p[1:3])
if status == SUCCESS {
size = 3
}
return
case 0xa1 <= b && b <= 0xfe:
return jis0208Table.DecodeHigh(p)
}
return utf8.RuneError, 1, INVALID_CHAR
}
func encodeEucJP(p []byte, c rune) (size int, status Status) {
if len(p) == 0 {
return 0, NO_ROOM
}
if c < 0x80 {
p[0] = byte(c)
return 1, SUCCESS
}
if len(p) < 2 {
return 0, NO_ROOM
}
if c > 0xffff {
p[0] = '?'
return 1, INVALID_CHAR
}
if 0xff61 <= c && c <= 0xff9f {
p[0] = 0x8e
p[1] = byte(c - (0xff61 - 0xa1))
return 2, SUCCESS
}
size, status = jis0208Table.EncodeHigh(p, c)
if status == SUCCESS {
return size, status
}
size, status = jis0212Table.EncodeHigh(p[1:], c)
switch status {
case SUCCESS:
p[0] = 0x8f
return size + 1, SUCCESS
case INVALID_CHAR:
p[0] = '?'
return 1, INVALID_CHAR
}
return size, status
}