| 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 | } |