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#include <assert.h>
#include <stdio.h>
#include <string.h>
#include "houdini.h"
#include "html_unescape.h"
static inline void
gh_buf_put_utf8(gh_buf *ob, int c)
{
unsigned char unichar[4];
if (c < 0x80) {
gh_buf_putc(ob, c);
}
else if (c < 0x800) {
unichar[0] = 192 + (c / 64);
unichar[1] = 128 + (c % 64);
gh_buf_put(ob, unichar, 2);
}
else if (c - 0xd800u < 0x800) {
gh_buf_putc(ob, '?');
}
else if (c < 0x10000) {
unichar[0] = 224 + (c / 4096);
unichar[1] = 128 + (c / 64) % 64;
unichar[2] = 128 + (c % 64);
gh_buf_put(ob, unichar, 3);
}
else if (c < 0x110000) {
unichar[0] = 240 + (c / 262144);
unichar[1] = 128 + (c / 4096) % 64;
unichar[2] = 128 + (c / 64) % 64;
unichar[3] = 128 + (c % 64);
gh_buf_put(ob, unichar, 4);
}
else {
gh_buf_putc(ob, '?');
}
}
static size_t
unescape_ent(gh_buf *ob, const uint8_t *src, size_t size)
{
size_t i = 0;
if (size > 3 && src[0] == '#') {
int codepoint = 0;
if (_isdigit(src[1])) {
for (i = 1; i < size && _isdigit(src[i]); ++i)
codepoint = (codepoint * 10) + (src[i] - '0');
}
else if (src[1] == 'x' || src[1] == 'X') {
for (i = 2; i < size && _isxdigit(src[i]); ++i)
codepoint = (codepoint * 16) + ((src[i] | 32) % 39 - 9);
}
if (i < size && src[i] == ';') {
gh_buf_put_utf8(ob, codepoint);
return i + 1;
}
}
else {
if (size > MAX_WORD_LENGTH)
size = MAX_WORD_LENGTH;
for (i = MIN_WORD_LENGTH; i < size; ++i) {
if (src[i] == ' ')
break;
if (src[i] == ';') {
const struct html_ent *entity = find_entity((char *)src, i);
if (entity != NULL) {
gh_buf_put(ob, entity->utf8, entity->utf8_len);
return i + 1;
}
break;
}
}
}
gh_buf_putc(ob, '&');
return 0;
}
int
houdini_unescape_html(gh_buf *ob, const uint8_t *src, size_t size)
{
size_t i = 0, org;
while (i < size) {
org = i;
while (i < size && src[i] != '&')
i++;
if (likely(i > org)) {
if (unlikely(org == 0)) {
if (i >= size)
return 0;
gh_buf_grow(ob, HOUDINI_UNESCAPED_SIZE(size));
}
gh_buf_put(ob, src + org, i - org);
}
/* escaping */
if (i >= size)
break;
i++;
i += unescape_ent(ob, src + i, size - i);
}
return 1;
}
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