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88 lines
2.3 KiB
88 lines
2.3 KiB
13 years ago
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/*
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* Simple URL decoding function
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* Copyright (c) 2012 Antti Seppälä
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*
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* References:
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* RFC 3986: Uniform Resource Identifier (URI): Generic Syntax
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* T. Berners-Lee et al. The Internet Society, 2005
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*
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* based on http://www.icosaedro.it/apache/urldecode.c
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* from Umberto Salsi (salsi@icosaedro.it)
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*
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* This file is part of Libav.
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*
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* Libav is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* Libav is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with Libav; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <ctype.h>
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#include <string.h>
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#include "libavutil/mem.h"
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#include "libavutil/avstring.h"
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#include "urldecode.h"
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char *ff_urldecode(const char *url)
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{
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int s = 0, d = 0, url_len = 0;
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char c;
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char *dest = NULL;
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if (!url)
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return NULL;
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url_len = strlen(url) + 1;
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dest = av_malloc(url_len);
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if (!dest)
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return NULL;
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while (s < url_len) {
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c = url[s++];
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if (c == '%' && s + 2 < url_len) {
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char c2 = url[s++];
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char c3 = url[s++];
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if (isxdigit(c2) && isxdigit(c3)) {
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c2 = av_tolower(c2);
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c3 = av_tolower(c3);
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if (c2 <= '9')
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c2 = c2 - '0';
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else
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c2 = c2 - 'a' + 10;
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if (c3 <= '9')
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c3 = c3 - '0';
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else
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c3 = c3 - 'a' + 10;
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dest[d++] = 16 * c2 + c3;
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} else { /* %zz or something other invalid */
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dest[d++] = c;
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dest[d++] = c2;
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dest[d++] = c3;
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}
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} else if (c == '+') {
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dest[d++] = ' ';
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} else {
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dest[d++] = c;
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}
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}
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return dest;
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}
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