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#include "unicode.h"
int utf8_enc(ucp_t ch, utf8_t *str) {
if (ch <= 0x7f) {
str[0] = ch;
return 1;
} else if (ch <= 0x7ff) {
str[0] = 0xc0 | (ch >> 6);
str[1] = 0x80 | (ch & 0x3f);
return 2;
} else if (ch <= 0xffff) {
if ((ch >= 0xd800) && (ch <= 0xdfff)) return UTF_ERR;
str[0] = 0xe0 | (ch >> 12);
str[1] = 0x80 | ((ch >> 6) & 0x3f);
str[2] = 0x80 | (ch & 0x3f);
return 3;
} else if (ch <= 0x10ffff) {
str[0] = 0xf0 | (ch >> 18);
str[1] = 0x80 | ((ch >> 12) & 0x3f);
str[2] = 0x80 | ((ch >> 6) & 0x3f);
str[3] = 0x80 | (ch & 0x3f);
return 4;
} else {
return UTF_ERR;
}
}
int utf8_dec(utf8_t *str, ucp_t *ch) {
if ((str[0] & 0x80) == 0x00) {
*ch = str[0];
return 1;
} else if ((str[0] & 0xe0) == 0xc0) {
if ((str[1] & 0xc0) != 0x80) return UTF_ERR;
*ch = (ucp_t)(str[0] & 0x1f) << 6;
*ch |= (ucp_t)(str[1] & 0x3f);
if (*ch < 0x80) return UTF_ERR;
return 2;
} else if ((str[0] & 0xf0) == 0xe0) {
if (((str[1] & 0xc0) != 0x80) || ((str[2] & 0xc0) != 0x80)) return UTF_ERR;
*ch = (ucp_t)(str[0] & 0x0f) << 12;
*ch |= (ucp_t)(str[1] & 0x3f) << 6;
*ch |= (ucp_t)(str[2] & 0x3f);
if ((*ch >= 0xd800) && (*ch <= 0xdfff)) return UTF_ERR;
if (*ch < 0x800) return UTF_ERR;
return 3;
} else if ((str[0] & 0xf8) == 0xf0) {
if (((str[1] & 0xc0) != 0x80) || ((str[2] & 0xc0) != 0x80) || ((str[3] & 0xc0) != 0x80)) return UTF_ERR;
*ch = (ucp_t)(str[0] & 0x07) << 18;
*ch |= (ucp_t)(str[1] & 0x0f) << 12;
*ch |= (ucp_t)(str[2] & 0x3f) << 6;
*ch |= (ucp_t)(str[3] & 0x3f);
if (*ch < 0x010000) return UTF_ERR;
if (*ch > 0x10ffff) return UTF_ERR;
return 4;
} else {
return UTF_ERR;
}
}
int utf8_len_ch(ucp_t ch) {
if (ch <= 0x7f) return 1;
if (ch <= 0x7ff) return 2;
if (ch <= 0xffff) return 3;
if (ch <= 0x10ffff) return 4;
return UTF_ERR;
}
int utf8_len_str(utf8_t *str) {
if ((*str & 0x80) == 0x00) return 1;
if ((*str & 0xe0) == 0xc0) return 2;
if ((*str & 0xf0) == 0xe0) return 3;
if ((*str & 0xf8) == 0xf0) return 4;
return UTF_ERR;
}
int utf8_seek(utf8_t *str, int off, ucp_t *ch) {
int i;
int len = 0;
if (off < 0) {
off = -off;
for (i=0; i<off; i++) {
len--;
while ((str[len] & 0xc0) == 0x80) len--;
}
} else {
for (i=0; i<off; i++) {
if ((str[len] & 0x80) == 0x00) {
len += 1;
} else if ((str[0] & 0xe0) == 0xc0) {
len += 2;
} else if ((str[0] & 0xf0) == 0xe0) {
len += 3;
} else if ((str[0] & 0xf8) == 0xf0) {
len += 4;
}
}
}
utf8_dec(str + len, ch);
return len;
}
int utf8_verify(utf8_t *str, size_t str_size, size_t *str_len) {
ucp_t ch;
size_t len = 0;
int ch_l, rv;
while (len < str_size) {
if (str_size - len < 4) {
rv = utf8_len_str(str + len);
if (rv < 0) break;
if (str_size - len < rv) break;
}
ch_l = utf8_dec(str + len, &ch);
if (ch_l > 0) {
if (ch == 0) {
if (str_len) *str_len = len;
return UTF_OK;
}
len += ch_l;
} else {
break;
}
}
if (len == str_size) len -= ch_l;
if (str_len) *str_len = len;
return UTF_ERR;
}
int utf16_enc(ucp_t ch, utf16_t *str) {
if (ch <= 0xffff) {
if ((ch >= 0xd800) && (ch <= 0xdfff)) return UTF_ERR;
str[0] = ch >> 8;
str[1] = ch & 0xff;
return 2;
} else if (ch <= 0x10ffff) {
uint16_t hi;
uint16_t lo;
ch -= 0x10000;
hi = (ch >> 10) + 0xd800;
lo = (ch & 0x3ff) + 0xdc00;
str[0] = hi >> 8;
str[1] = hi & 0xff;
str[2] = lo >> 8;
str[3] = lo & 0xff;
return 4;
} else {
return UTF_ERR;
}
}
int utf16_dec(utf16_t *str, ucp_t *ch) {
*ch = (str[0] << 8) | str[1];
if ((*ch >= 0xd800) && (*ch <= 0xdfff)) {
uint16_t hi = *ch;
uint16_t lo;
if (hi > 0xdbff) return UTF_ERR;
lo = (str[2] << 8) | str[3];
if ((lo < 0xdc00) || (lo > 0xdfff)) return UTF_ERR;
*ch = (((hi - 0xd800) << 10) | (lo - 0xdc00)) + 0x10000;
return 4;
} else {
return 2;
}
}
int utf16_len_ch(ucp_t ch) {
if (ch <= 0xffff) return 2;
if (ch <= 0x10ffff) return 4;
return UTF_ERR;
}
int utf16_len_str(utf16_t *str) {
uint16_t ch = (str[0] << 8) | str[1];
if ((ch >= 0xd800) && (ch <= 0xdfff)) return 4;
return 2;
}
int utf16_seek(utf16_t *str, int off, ucp_t *ch) {
int i;
int len = 0;
uint16_t cu;
if (off < 0) {
off = -off;
for (i=0; i<off; i++) {
len -= 2;
cu = (str[len] << 8) | str[len + 1];
if ((cu >= 0xdc00) && (cu <= 0xdfff)) {
len -= 2;
}
}
} else {
for (i=0; i<off; i++) {
cu = (str[len] << 8) | str[len + 1];
if ((cu >= 0xd800) && (cu <= 0xdbff)) {
len += 4;
} else {
len += 2;
}
}
}
utf16_dec(str + len, ch);
return len;
}
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