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#include "internal.h"
int
utf8·encode(rune *r, byte *s)
{
rune c;
c = *r;
if(c < Rune1Byte){ // 7 bits
s[0] = (uint8)c;
return 1;
}
if(c < Rune2Byte){ // 11 bits
s[0] = TByte1 | (c >> 6);
s[1] = Tx | (c & TMask);
return 2;
}
if(c < Rune3Byte){ // 16 bits
s[0] = TByte2 | ((c >> 12));
s[1] = Tx | ((c >> 6) & TMask);
s[2] = Tx | ((c) & TMask);
return 3;
}
// 22 bits
if(c > RuneMax || (RuneSurrogateMin <= c && c <= RuneSurrogateMax))
c = RuneErr;
s[0] = TByte3 | ((c >> 18));
s[1] = Tx | ((c >> 12) & TMask);
s[2] = Tx | ((c >> 6) & TMask);
s[3] = Tx | ((c) & TMask);
return 4;
}
#if 0
int
utf8·encode(rune* r, byte* s)
{
int i, j;
rune c;
c = *r;
if(c <= Rune1) {
s[0] = c;
return 1;
}
for(i = 2; i < UTFmax + 1; i++){
if(i == 3){
if(c > RuneMax)
c = RuneErr;
if(SurrogateMin <= c && c <= SurrogateMax)
c = RuneErr;
}
if(c <= RuneX(i) || i == UTFmax) {
s[0] = Tbyte(i) | (c >> (i - 1)*Bitx);
for(j = 1; j < i; j++)
s[j] = Tx | ((c >> (i - j - 1)*Bitx) & Maskx);
return i;
}
}
return UTFmax;
}
#endif
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