| 1 | /* |
| 2 | * Copyright (c) 2012 Nicolas George |
| 3 | * |
| 4 | * This file is part of FFmpeg. |
| 5 | * |
| 6 | * FFmpeg is free software; you can redistribute it and/or |
| 7 | * modify it under the terms of the GNU Lesser General Public License |
| 8 | * as published by the Free Software Foundation; either |
| 9 | * version 2.1 of the License, or (at your option) any later version. |
| 10 | * |
| 11 | * FFmpeg is distributed in the hope that it will be useful, |
| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 | * GNU Lesser General Public License for more details. |
| 15 | * |
| 16 | * You should have received a copy of the GNU Lesser General Public License |
| 17 | * along with FFmpeg; if not, write to the Free Software Foundation, Inc., |
| 18 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| 19 | */ |
| 20 | |
| 21 | #include <string.h> |
| 22 | #include "libavutil/avstring.h" |
| 23 | #include "libavutil/base64.h" |
| 24 | #include "url.h" |
| 25 | |
| 26 | typedef struct { |
| 27 | const uint8_t *data; |
| 28 | void *tofree; |
| 29 | size_t size; |
| 30 | size_t pos; |
| 31 | } DataContext; |
| 32 | |
| 33 | static av_cold int data_open(URLContext *h, const char *uri, int flags) |
| 34 | { |
| 35 | DataContext *dc = h->priv_data; |
| 36 | const char *data, *opt, *next; |
| 37 | char *ddata; |
| 38 | int ret, base64 = 0; |
| 39 | size_t in_size; |
| 40 | |
| 41 | /* data:content/type[;base64],payload */ |
| 42 | |
| 43 | av_strstart(uri, "data:", &uri); |
| 44 | data = strchr(uri, ','); |
| 45 | if (!data) { |
| 46 | av_log(h, AV_LOG_ERROR, "No ',' delimiter in URI\n"); |
| 47 | return AVERROR(EINVAL); |
| 48 | } |
| 49 | opt = uri; |
| 50 | while (opt < data) { |
| 51 | next = av_x_if_null(memchr(opt, ';', data - opt), data); |
| 52 | if (opt == uri) { |
| 53 | if (!memchr(opt, '/', next - opt)) { /* basic validity check */ |
| 54 | av_log(h, AV_LOG_ERROR, "Invalid content-type '%.*s'\n", |
| 55 | (int)(next - opt), opt); |
| 56 | return AVERROR(EINVAL); |
| 57 | } |
| 58 | av_log(h, AV_LOG_VERBOSE, "Content-type: %.*s\n", |
| 59 | (int)(next - opt), opt); |
| 60 | } else { |
| 61 | if (!av_strncasecmp(opt, "base64", next - opt)) { |
| 62 | base64 = 1; |
| 63 | } else { |
| 64 | av_log(h, AV_LOG_VERBOSE, "Ignoring option '%.*s'\n", |
| 65 | (int)(next - opt), opt); |
| 66 | } |
| 67 | } |
| 68 | opt = next + 1; |
| 69 | } |
| 70 | |
| 71 | data++; |
| 72 | in_size = strlen(data); |
| 73 | if (base64) { |
| 74 | size_t out_size = 3 * (in_size / 4) + 1; |
| 75 | |
| 76 | if (out_size > INT_MAX || !(ddata = av_malloc(out_size))) |
| 77 | return AVERROR(ENOMEM); |
| 78 | if ((ret = av_base64_decode(ddata, data, out_size)) < 0) { |
| 79 | av_free(ddata); |
| 80 | av_log(h, AV_LOG_ERROR, "Invalid base64 in URI\n"); |
| 81 | return ret; |
| 82 | } |
| 83 | dc->data = dc->tofree = ddata; |
| 84 | dc->size = ret; |
| 85 | } else { |
| 86 | dc->data = data; |
| 87 | dc->size = in_size; |
| 88 | } |
| 89 | return 0; |
| 90 | } |
| 91 | |
| 92 | static av_cold int data_close(URLContext *h) |
| 93 | { |
| 94 | DataContext *dc = h->priv_data; |
| 95 | |
| 96 | av_freep(&dc->tofree); |
| 97 | return 0; |
| 98 | } |
| 99 | |
| 100 | static int data_read(URLContext *h, unsigned char *buf, int size) |
| 101 | { |
| 102 | DataContext *dc = h->priv_data; |
| 103 | |
| 104 | if (dc->pos >= dc->size) |
| 105 | return AVERROR_EOF; |
| 106 | size = FFMIN(size, dc->size - dc->pos); |
| 107 | memcpy(buf, dc->data + dc->pos, size); |
| 108 | dc->pos += size; |
| 109 | return size; |
| 110 | } |
| 111 | |
| 112 | URLProtocol ff_data_protocol = { |
| 113 | .name = "data", |
| 114 | .url_open = data_open, |
| 115 | .url_close = data_close, |
| 116 | .url_read = data_read, |
| 117 | .priv_data_size = sizeof(DataContext), |
| 118 | }; |