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50 lines
922 B
50 lines
922 B
package mahonia
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import "unicode/utf8"
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// Translate enables a Decoder to implement go-charset's Translator interface.
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func (d Decoder) Translate(data []byte, eof bool) (n int, cdata []byte, err error) {
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cdata = make([]byte, len(data)+1)
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destPos := 0
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for n < len(data) {
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rune, size, status := d(data[n:])
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switch status {
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case STATE_ONLY:
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n += size
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continue
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case NO_ROOM:
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if !eof {
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return n, cdata[:destPos], nil
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}
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rune = 0xfffd
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n = len(data)
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default:
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n += size
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}
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if rune < 128 {
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if destPos >= len(cdata) {
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cdata = doubleLength(cdata)
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}
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cdata[destPos] = byte(rune)
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destPos++
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} else {
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if destPos+utf8.RuneLen(rune) > len(cdata) {
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cdata = doubleLength(cdata)
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}
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destPos += utf8.EncodeRune(cdata[destPos:], rune)
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}
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}
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return n, cdata[:destPos], nil
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}
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func doubleLength(b []byte) []byte {
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b2 := make([]byte, 2*len(b))
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copy(b2, b)
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return b2
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}
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