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2ba45a60 DM |
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 | } |