79 lines
1.1 KiB
Go
79 lines
1.1 KiB
Go
package mahonia
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// Converters for GBK encoding.
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func init() {
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RegisterCharset(&Charset{
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Name: "GBK",
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Aliases: []string{"GB2312"}, // GBK is a superset of GB2312.
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NewDecoder: func() Decoder {
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return decodeGBKRune
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},
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NewEncoder: func() Encoder {
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return encodeGBKRune
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},
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})
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}
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func decodeGBKRune(p []byte) (r rune, size int, status Status) {
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if len(p) == 0 {
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status = NO_ROOM
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return
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}
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b := p[0]
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if b < 128 {
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return rune(b), 1, SUCCESS
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}
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if len(p) < 2 {
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status = NO_ROOM
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return
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}
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c := uint16(p[0])<<8 + uint16(p[1])
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r = rune(gbkToUnicode[c])
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if r == 0 {
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r = gbkToUnicodeExtra[c]
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}
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if r != 0 {
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return r, 2, SUCCESS
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}
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return 0xfffd, 1, INVALID_CHAR
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}
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func encodeGBKRune(p []byte, r rune) (size int, status Status) {
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if len(p) == 0 {
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status = NO_ROOM
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return
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}
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if r < 128 {
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p[0] = byte(r)
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return 1, SUCCESS
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}
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if len(p) < 2 {
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status = NO_ROOM
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return
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}
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var c uint16
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if r < 0x10000 {
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c = unicodeToGBK[r]
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} else {
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c = unicodeToGBKExtra[r]
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}
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if c != 0 {
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p[0] = byte(c >> 8)
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p[1] = byte(c)
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return 2, SUCCESS
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}
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p[0] = 0x1a
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return 1, INVALID_CHAR
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}
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