LCOV - code coverage report
Current view: top level - libavcodec - bmp_parser.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 43 47 91.5 %
Date: 2017-12-14 08:27:08 Functions: 1 1 100.0 %

          Line data    Source code
       1             : /*
       2             :  * BMP parser
       3             :  * Copyright (c) 2012 Paul B Mahol
       4             :  *
       5             :  * This file is part of FFmpeg.
       6             :  *
       7             :  * FFmpeg is free software; you can redistribute it and/or
       8             :  * modify it under the terms of the GNU Lesser General Public
       9             :  * License as published by the Free Software Foundation; either
      10             :  * version 2.1 of the License, or (at your option) any later version.
      11             :  *
      12             :  * FFmpeg is distributed in the hope that it will be useful,
      13             :  * but WITHOUT ANY WARRANTY; without even the implied warranty of
      14             :  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      15             :  * Lesser General Public License for more details.
      16             :  *
      17             :  * You should have received a copy of the GNU Lesser General Public
      18             :  * License along with FFmpeg; if not, write to the Free Software
      19             :  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
      20             :  */
      21             : 
      22             : /**
      23             :  * @file
      24             :  * BMP parser
      25             :  */
      26             : 
      27             : #include "libavutil/bswap.h"
      28             : #include "libavutil/common.h"
      29             : 
      30             : #include "parser.h"
      31             : 
      32             : typedef struct BMPParseContext {
      33             :     ParseContext pc;
      34             :     uint32_t fsize;
      35             :     uint32_t remaining_size;
      36             : } BMPParseContext;
      37             : 
      38          85 : static int bmp_parse(AVCodecParserContext *s, AVCodecContext *avctx,
      39             :                      const uint8_t **poutbuf, int *poutbuf_size,
      40             :                      const uint8_t *buf, int buf_size)
      41             : {
      42          85 :     BMPParseContext *bpc = s->priv_data;
      43          85 :     uint64_t state = bpc->pc.state64;
      44          85 :     int next = END_NOT_FOUND;
      45          85 :     int i = 0;
      46             : 
      47          85 :     *poutbuf_size = 0;
      48             : 
      49         119 : restart:
      50         119 :     if (bpc->pc.frame_start_found <= 2+4+4) {
      51        3810 :         for (; i < buf_size; i++) {
      52        3768 :             state = (state << 8) | buf[i];
      53        3768 :             if (bpc->pc.frame_start_found == 0) {
      54        3568 :                 if ((state >> 48) == (('B' << 8) | 'M')) {
      55          20 :                     bpc->fsize = av_bswap32(state >> 16);
      56          20 :                     if (bpc->fsize > 17)
      57          20 :                         bpc->pc.frame_start_found = 1;
      58             :                 }
      59         200 :             } else if (bpc->pc.frame_start_found == 2+4+4) {
      60             : //                 unsigned hsize = av_bswap32(state>>32);
      61          20 :                 unsigned ihsize = av_bswap32(state);
      62          20 :                 if (ihsize < 12 || ihsize > 200) {
      63           0 :                     bpc->pc.frame_start_found = 0;
      64           0 :                     continue;
      65             :                 }
      66          20 :                 bpc->pc.frame_start_found++;
      67          20 :                 bpc->remaining_size = bpc->fsize + i - 17;
      68             : 
      69          20 :                 if (bpc->pc.index + i > 17) {
      70           3 :                     next = i - 17;
      71           3 :                     state = 0;
      72           3 :                     break;
      73             :                 } else {
      74          17 :                     bpc->pc.state64 = 0;
      75          17 :                     goto restart;
      76             :                 }
      77         180 :             } else if (bpc->pc.frame_start_found)
      78         180 :                 bpc->pc.frame_start_found++;
      79             :         }
      80          45 :         bpc->pc.state64 = state;
      81             :     } else {
      82          57 :         if (bpc->remaining_size) {
      83          57 :             i = FFMIN(bpc->remaining_size, buf_size);
      84          57 :             bpc->remaining_size -= i;
      85          57 :             if (bpc->remaining_size)
      86          40 :                 goto flush;
      87             : 
      88          17 :             bpc->pc.frame_start_found = 0;
      89          17 :             goto restart;
      90             :         }
      91             :     }
      92             : 
      93           0 : flush:
      94          85 :     if (ff_combine_frame(&bpc->pc, next, &buf, &buf_size) < 0)
      95          54 :         return buf_size;
      96             : 
      97          31 :     if (next != END_NOT_FOUND && next < 0)
      98           0 :         bpc->pc.frame_start_found = FFMAX(bpc->pc.frame_start_found - i - 1, 0);
      99             :     else
     100          31 :         bpc->pc.frame_start_found = 0;
     101             : 
     102          31 :     *poutbuf      = buf;
     103          31 :     *poutbuf_size = buf_size;
     104          31 :     return next;
     105             : }
     106             : 
     107             : AVCodecParser ff_bmp_parser = {
     108             :     .codec_ids      = { AV_CODEC_ID_BMP },
     109             :     .priv_data_size = sizeof(BMPParseContext),
     110             :     .parser_parse   = bmp_parse,
     111             :     .parser_close   = ff_parse_close,
     112             : };

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