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#include <stdlib.h>
#include <stdint.h>
#include <assert.h>
#include "utf8.h"
static const int8_t utf8proc_utf8class[256] = {
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,
4, 4, 4, 4, 4, 4, 4, 4, 0, 0, 0, 0, 0, 0, 0, 0 };
static void encode_unknown(strbuf *buf)
{
static const uint8_t repl[] = {239, 191, 189};
strbuf_put(buf, repl, 3);
}
int utf8proc_charlen(const uint8_t *str, int str_len)
{
int length, i;
if (!str_len)
return 0;
length = utf8proc_utf8class[str[0]];
if (!length)
return -1;
if (str_len >= 0 && length > str_len)
return -str_len;
for (i = 1; i < length; i++) {
if ((str[i] & 0xC0) != 0x80)
return -i;
}
return length;
}
void utf8proc_detab(strbuf *ob, const uint8_t *line, size_t size)
{
static const uint8_t whitespace[] = " ";
size_t i = 0, tab = 0;
while (i < size) {
size_t org = i;
while (i < size && line[i] != '\t' && line[i] <= 0x80) {
i++; tab++;
}
if (i > org)
strbuf_put(ob, line + org, i - org);
if (i >= size)
break;
if (line[i] == '\t') {
int numspaces = 4 - (tab % 4);
strbuf_put(ob, whitespace, numspaces);
i += 1;
tab += numspaces;
} else {
int charlen = utf8proc_charlen(line + i, size - i);
if (charlen >= 0) {
strbuf_put(ob, line + i, charlen);
} else {
encode_unknown(ob);
charlen = -charlen;
}
i += charlen;
tab += 1;
}
}
}
int utf8proc_iterate(const uint8_t *str, int str_len, int32_t *dst)
{
int length;
int32_t uc = -1;
*dst = -1;
length = utf8proc_charlen(str, str_len);
if (length < 0)
return -1;
switch (length) {
case 1:
uc = str[0];
break;
case 2:
uc = ((str[0] & 0x1F) << 6) + (str[1] & 0x3F);
if (uc < 0x80) uc = -1;
break;
case 3:
uc = ((str[0] & 0x0F) << 12) + ((str[1] & 0x3F) << 6)
+ (str[2] & 0x3F);
if (uc < 0x800 || (uc >= 0xD800 && uc < 0xE000) ||
(uc >= 0xFDD0 && uc < 0xFDF0)) uc = -1;
break;
case 4:
uc = ((str[0] & 0x07) << 18) + ((str[1] & 0x3F) << 12)
+ ((str[2] & 0x3F) << 6) + (str[3] & 0x3F);
if (uc < 0x10000 || uc >= 0x110000) uc = -1;
break;
}
if (uc < 0 || ((uc & 0xFFFF) >= 0xFFFE))
return -1;
*dst = uc;
return length;
}
void utf8proc_encode_char(int32_t uc, strbuf *buf)
{
uint8_t dst[4];
int len = 0;
assert(uc >= 0);
if (uc < 0x80) {
dst[0] = uc;
len = 1;
} else if (uc < 0x800) {
dst[0] = 0xC0 + (uc >> 6);
dst[1] = 0x80 + (uc & 0x3F);
len = 2;
} else if (uc == 0xFFFF) {
dst[0] = 0xFF;
len = 1;
} else if (uc == 0xFFFE) {
dst[0] = 0xFE;
len = 1;
} else if (uc < 0x10000) {
dst[0] = 0xE0 + (uc >> 12);
dst[1] = 0x80 + ((uc >> 6) & 0x3F);
dst[2] = 0x80 + (uc & 0x3F);
len = 3;
} else if (uc < 0x110000) {
dst[0] = 0xF0 + (uc >> 18);
dst[1] = 0x80 + ((uc >> 12) & 0x3F);
dst[2] = 0x80 + ((uc >> 6) & 0x3F);
dst[3] = 0x80 + (uc & 0x3F);
len = 4;
} else {
encode_unknown(buf);
return;
}
strbuf_put(buf, dst, len);
}
void utf8proc_case_fold(strbuf *dest, const uint8_t *str, int len)
{
int32_t c;
#define bufpush(x) \
utf8proc_encode_char(x, dest)
while (len > 0) {
int char_len = utf8proc_iterate(str, len, &c);
if (char_len >= 0) {
#include "case_fold_switch.inc"
} else {
encode_unknown(dest);
char_len = -char_len;
}
str += char_len;
len -= char_len;
}
}
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