blob: 283d9126716e46f6116d2431c2dbb654a22601df
1 | /* |
2 | * Simple URL decoding function |
3 | * Copyright (c) 2012 Antti Seppälä |
4 | * |
5 | * References: |
6 | * RFC 3986: Uniform Resource Identifier (URI): Generic Syntax |
7 | * T. Berners-Lee et al. The Internet Society, 2005 |
8 | * |
9 | * based on http://www.icosaedro.it/apache/urldecode.c |
10 | * from Umberto Salsi (salsi@icosaedro.it) |
11 | * |
12 | * This file is part of FFmpeg. |
13 | * |
14 | * FFmpeg is free software; you can redistribute it and/or |
15 | * modify it under the terms of the GNU Lesser General Public |
16 | * License as published by the Free Software Foundation; either |
17 | * version 2.1 of the License, or (at your option) any later version. |
18 | * |
19 | * FFmpeg is distributed in the hope that it will be useful, |
20 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
21 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
22 | * Lesser General Public License for more details. |
23 | * |
24 | * You should have received a copy of the GNU Lesser General Public |
25 | * License along with FFmpeg; if not, write to the Free Software |
26 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
27 | */ |
28 | |
29 | #include <string.h> |
30 | |
31 | #include "libavutil/mem.h" |
32 | #include "libavutil/avstring.h" |
33 | #include "urldecode.h" |
34 | |
35 | char *ff_urldecode(const char *url) |
36 | { |
37 | int s = 0, d = 0, url_len = 0; |
38 | char c; |
39 | char *dest = NULL; |
40 | |
41 | if (!url) |
42 | return NULL; |
43 | |
44 | url_len = strlen(url) + 1; |
45 | dest = av_malloc(url_len); |
46 | |
47 | if (!dest) |
48 | return NULL; |
49 | |
50 | while (s < url_len) { |
51 | c = url[s++]; |
52 | |
53 | if (c == '%' && s + 2 < url_len) { |
54 | char c2 = url[s++]; |
55 | char c3 = url[s++]; |
56 | if (av_isxdigit(c2) && av_isxdigit(c3)) { |
57 | c2 = av_tolower(c2); |
58 | c3 = av_tolower(c3); |
59 | |
60 | if (c2 <= '9') |
61 | c2 = c2 - '0'; |
62 | else |
63 | c2 = c2 - 'a' + 10; |
64 | |
65 | if (c3 <= '9') |
66 | c3 = c3 - '0'; |
67 | else |
68 | c3 = c3 - 'a' + 10; |
69 | |
70 | dest[d++] = 16 * c2 + c3; |
71 | |
72 | } else { /* %zz or something other invalid */ |
73 | dest[d++] = c; |
74 | dest[d++] = c2; |
75 | dest[d++] = c3; |
76 | } |
77 | } else if (c == '+') { |
78 | dest[d++] = ' '; |
79 | } else { |
80 | dest[d++] = c; |
81 | } |
82 | |
83 | } |
84 | |
85 | return dest; |
86 | } |
87 |