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- package idna
- func (c info) appendMapping(b []byte, s string) []byte {
- index := int(c >> indexShift)
- if c&xorBit == 0 {
- s := mappings[index:]
- return append(b, s[1:s[0]+1]...)
- }
- b = append(b, s...)
- if c&inlineXOR == inlineXOR {
-
- b[len(b)-1] ^= byte(index)
- } else {
- for p := len(b) - int(xorData[index]); p < len(b); p++ {
- index++
- b[p] ^= xorData[index]
- }
- }
- return b
- }
- type valueRange struct {
- value uint16
- lo, hi byte
- }
- type sparseBlocks struct {
- values []valueRange
- offset []uint16
- }
- var idnaSparse = sparseBlocks{
- values: idnaSparseValues[:],
- offset: idnaSparseOffset[:],
- }
- var trie = &idnaTrie{}
- func (t *sparseBlocks) lookup(n uint32, b byte) uint16 {
- offset := t.offset[n]
- header := t.values[offset]
- lo := offset + 1
- hi := lo + uint16(header.lo)
- for lo < hi {
- m := lo + (hi-lo)/2
- r := t.values[m]
- if r.lo <= b && b <= r.hi {
- return r.value + uint16(b-r.lo)*header.value
- }
- if b < r.lo {
- hi = m
- } else {
- lo = m + 1
- }
- }
- return 0
- }
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