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  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. };
  119.