LCOV - code coverage report
Current view: top level - libavcodec - xiph.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 24 29 82.8 %
Date: 2017-12-12 11:08:38 Functions: 1 1 100.0 %

          Line data    Source code
       1             : /*
       2             :  * Copyright (C) 2007 The FFmpeg Project
       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
       8             :  * License 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 GNU
      14             :  * Lesser General Public License for more details.
      15             :  *
      16             :  * You should have received a copy of the GNU Lesser General Public
      17             :  * License along with FFmpeg; if not, write to the Free Software
      18             :  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
      19             :  */
      20             : 
      21             : #include "libavutil/intreadwrite.h"
      22             : #include "xiph.h"
      23             : 
      24         100 : int avpriv_split_xiph_headers(const uint8_t *extradata, int extradata_size,
      25             :                           int first_header_size, const uint8_t *header_start[3],
      26             :                           int header_len[3])
      27             : {
      28             :     int i;
      29             : 
      30         104 :     if (extradata_size >= 6 && AV_RB16(extradata) == first_header_size) {
      31           4 :         int overall_len = 6;
      32          16 :         for (i=0; i<3; i++) {
      33          12 :             header_len[i] = AV_RB16(extradata);
      34          12 :             extradata += 2;
      35          12 :             header_start[i] = extradata;
      36          12 :             extradata += header_len[i];
      37          12 :             if (overall_len > extradata_size - header_len[i])
      38           0 :                 return -1;
      39          12 :             overall_len += header_len[i];
      40             :         }
      41         192 :     } else if (extradata_size >= 3 && extradata_size < INT_MAX - 0x1ff && extradata[0] == 2) {
      42          96 :         int overall_len = 3;
      43          96 :         extradata++;
      44         288 :         for (i=0; i<2; i++, extradata++) {
      45         192 :             header_len[i] = 0;
      46         192 :             for (; overall_len < extradata_size && *extradata==0xff; extradata++) {
      47           0 :                 header_len[i] += 0xff;
      48           0 :                 overall_len   += 0xff + 1;
      49             :             }
      50         192 :             header_len[i] += *extradata;
      51         192 :             overall_len   += *extradata;
      52         192 :             if (overall_len > extradata_size)
      53           0 :                 return -1;
      54             :         }
      55          96 :         header_len[2] = extradata_size - overall_len;
      56          96 :         header_start[0] = extradata;
      57          96 :         header_start[1] = header_start[0] + header_len[0];
      58          96 :         header_start[2] = header_start[1] + header_len[1];
      59             :     } else {
      60           0 :         return -1;
      61             :     }
      62         100 :     return 0;
      63             : }

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