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/*
* Simple URL decoding function
* Copyright (c) 2012 Antti Seppälä
*
* References:
* RFC 3986: Uniform Resource Identifier (URI): Generic Syntax
* T. Berners-Lee et al. The Internet Society, 2005
*
* based on http://www.icosaedro.it/apache/urldecode.c
* from Umberto Salsi (salsi@icosaedro.it)
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <string.h>
#include "libavutil/error.h"
#include "libavutil/macros.h"
#include "libavutil/mem.h"
#include "libavutil/avstring.h"
#include "urldecode.h"
static size_t urldecode(char *dest, const char *url, size_t url_len, int decode_plus_sign)
{
size_t s = 0, d = 0;
char c;
while (s < url_len) {
c = url[s++];
if (c == '%' && s + 1 < url_len) {
char c2 = url[s++];
char c3 = url[s++];
if (av_isxdigit(c2) && av_isxdigit(c3)) {
c2 = av_tolower(c2);
c3 = av_tolower(c3);
if (c2 <= '9')
c2 = c2 - '0';
else
c2 = c2 - 'a' + 10;
if (c3 <= '9')
c3 = c3 - '0';
else
c3 = c3 - 'a' + 10;
dest[d++] = 16 * c2 + c3;
} else { /* %zz or something other invalid */
dest[d++] = c;
dest[d++] = c2;
dest[d++] = c3;
}
} else if (c == '+' && decode_plus_sign) {
dest[d++] = ' ';
} else {
dest[d++] = c;
}
}
return d;
}
char *ff_urldecode(const char *url, int decode_plus_sign)
{
char *dest = NULL;
size_t url_len;
if (!url)
return NULL;
url_len = strlen(url) + 1;
dest = av_malloc(url_len);
if (!dest)
return NULL;
urldecode(dest, url, url_len, decode_plus_sign);
return dest;
}
int ff_urldecode_len(char *dest, size_t dest_len, const char *url, size_t url_max_len, int decode_plus_sign)
{
size_t written_bytes;
size_t url_len = strlen(url);
url_len = FFMIN(url_len, url_max_len);
if (dest_len <= url_len)
return AVERROR(EINVAL);
written_bytes = urldecode(dest, url, url_len, decode_plus_sign);
dest[written_bytes] = '\0';
return written_bytes;
}
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