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79 lines
1.7 KiB
79 lines
1.7 KiB
// Charset implementation using four int64 bitmasks
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//
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// Each charset mask is 32 bytes, which fits into a 64 byte cache line.
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package sip
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var tokencMask [4]uint64
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var qdtextcMask [4]uint64
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func init() {
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charsetAddRange(&tokencMask, 'a', 'z')
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charsetAddRange(&tokencMask, 'A', 'Z')
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charsetAddRange(&tokencMask, '0', '9')
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charsetAdd(&tokencMask, '-')
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charsetAdd(&tokencMask, '.')
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charsetAdd(&tokencMask, '!')
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charsetAdd(&tokencMask, '%')
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charsetAdd(&tokencMask, '*')
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charsetAdd(&tokencMask, '_')
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charsetAdd(&tokencMask, '+')
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charsetAdd(&tokencMask, '`')
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charsetAdd(&tokencMask, '\'')
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charsetAdd(&tokencMask, '~')
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charsetAdd(&qdtextcMask, '\r')
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charsetAdd(&qdtextcMask, '\n')
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charsetAdd(&qdtextcMask, '\t')
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charsetAdd(&qdtextcMask, ' ')
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charsetAdd(&qdtextcMask, '!')
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charsetAddRange(&qdtextcMask, 0x23, 0x5B)
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charsetAddRange(&qdtextcMask, 0x5D, 0x7E)
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}
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func tokenc(c byte) bool {
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return charsetContains(&tokencMask, c)
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}
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func qdtextc(c byte) bool {
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return charsetContains(&qdtextcMask, c)
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}
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func qdtextesc(c byte) bool {
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return 0x00 <= c && c <= 0x09 ||
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0x0B <= c && c <= 0x0C ||
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0x0E <= c && c <= 0x7F
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}
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func whitespacec(c byte) bool {
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return c == ' ' || c == '\t' || c == '\r' || c == '\n'
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}
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func charsetContains(mask *[4]uint64, i byte) bool {
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return mask[i/64]&(1<<(i%64)) != 0
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}
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func charsetAdd(mask *[4]uint64, i byte) {
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mask[i/64] |= 1 << (i % 64)
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}
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func charsetAddRange(mask *[4]uint64, a, b byte) {
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for i := a; i <= b; i++ {
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charsetAdd(mask, i)
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}
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// var m uint64
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// i := a
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// j := i / 64
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// for i <= b {
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// m &= 1 << (i % 64)
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// i++
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// if i%64 == 0 {
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// mask[j] &= m
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// j = i / 64
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// m = 0
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// }
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// }
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// if m != 0 {
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// mask[j] |= m
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// }
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}
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