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#include <stdint.h>
#include <stddef.h>
#include "unicode.h"
uint8_t masks[] = {
0x7F,
0x1F,
0x0F,
0x07,
0x03,
0x01
};
uint32_t utf8_decode(const char **char_str) {
uint8_t **s = (uint8_t **)char_str;
uint32_t cp = 0;
if (**s < 128) {
// shortcut
cp = **s;
++*s;
return cp;
}
int size = utf8_size((char *)*s);
if (size == -1) {
++*s;
return UTF8_INVALID;
}
uint8_t mask = masks[size - 1];
cp = **s & mask;
++*s;
while (--size) {
cp <<= 6;
cp |= **s & 0x3f;
++*s;
}
return cp;
}