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#include <assert.h>
#include <stdio.h>
#include <string.h>
#include "houdini.h"
#define hex2c(c) ((c | 32) % 39 - 9)
static int
unescape(gh_buf *ob, const uint8_t *src, size_t size, int is_url)
{
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 && !is_url)
return 0;
gh_buf_grow(ob, HOUDINI_UNESCAPED_SIZE(size));
}
gh_buf_put(ob, src + org, i - org);
}
/* escaping */
if (i >= size)
break;
i++;
if (i + 1 < size && _isxdigit(src[i]) && _isxdigit(src[i + 1])) {
unsigned char new_char = (hex2c(src[i]) << 4) + hex2c(src[i + 1]);
gh_buf_putc(ob, new_char);
i += 2;
} else {
gh_buf_putc(ob, '%');
}
}
if (is_url) {
char *find = (char *)gh_buf_cstr(ob);
while ((find = strchr(find, '+')) != NULL)
*find = ' ';
}
return 1;
}
int
houdini_unescape_uri(gh_buf *ob, const uint8_t *src, size_t size)
{
return unescape(ob, src, size, 0);
}
int
houdini_unescape_url(gh_buf *ob, const uint8_t *src, size_t size)
{
return unescape(ob, src, size, 1);
}
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