LCOV - code coverage report
Current view: top level - libavcodec - pnm_parser.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 28 35 80.0 %
Date: 2017-12-16 13:57:32 Functions: 1 1 100.0 %

          Line data    Source code
       1             : /*
       2             :  * PNM image parser
       3             :  * Copyright (c) 2002, 2003 Fabrice Bellard
       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             : #include "libavutil/imgutils.h"
      23             : 
      24             : #include "parser.h" //for ParseContext
      25             : #include "pnm.h"
      26             : 
      27             : 
      28        5159 : static int pnm_parse(AVCodecParserContext *s, AVCodecContext *avctx,
      29             :                      const uint8_t **poutbuf, int *poutbuf_size,
      30             :                      const uint8_t *buf, int buf_size)
      31             : {
      32        5159 :     ParseContext *pc = s->priv_data;
      33             :     PNMContext pnmctx;
      34             :     int next;
      35             : 
      36        5159 :     for (; pc->overread > 0; pc->overread--) {
      37           0 :         pc->buffer[pc->index++]= pc->buffer[pc->overread_index++];
      38             :     }
      39        5159 : retry:
      40        5159 :     if (pc->index) {
      41        4556 :         pnmctx.bytestream_start =
      42        4556 :         pnmctx.bytestream       = pc->buffer;
      43        4556 :         pnmctx.bytestream_end   = pc->buffer + pc->index;
      44             :     } else {
      45         603 :         pnmctx.bytestream_start =
      46         603 :         pnmctx.bytestream       = (uint8_t *) buf; /* casts avoid warnings */
      47         603 :         pnmctx.bytestream_end   = (uint8_t *) buf + buf_size;
      48             :     }
      49        5159 :     if (ff_pnm_decode_header(avctx, &pnmctx) < 0) {
      50           9 :         if (pnmctx.bytestream < pnmctx.bytestream_end) {
      51           0 :             if (pc->index) {
      52           0 :                 pc->index = 0;
      53             :             } else {
      54           0 :                 buf++;
      55           0 :                 buf_size--;
      56             :             }
      57           0 :             goto retry;
      58             :         }
      59           9 :         next = END_NOT_FOUND;
      60        5150 :     } else if (pnmctx.type < 4) {
      61           0 :         next = END_NOT_FOUND;
      62             :     } else {
      63       10300 :         next = pnmctx.bytestream - pnmctx.bytestream_start
      64        5150 :                + av_image_get_buffer_size(avctx->pix_fmt, avctx->width, avctx->height, 1);
      65        5150 :         if (pnmctx.bytestream_start != buf)
      66        4556 :             next -= pc->index;
      67        5150 :         if (next > buf_size)
      68        4557 :             next = END_NOT_FOUND;
      69             :     }
      70             : 
      71        5159 :     if (ff_combine_frame(pc, next, &buf, &buf_size) < 0) {
      72        4557 :         *poutbuf      = NULL;
      73        4557 :         *poutbuf_size = 0;
      74        4557 :         return buf_size;
      75             :     }
      76         602 :     *poutbuf      = buf;
      77         602 :     *poutbuf_size = buf_size;
      78         602 :     return next;
      79             : }
      80             : 
      81             : AVCodecParser ff_pnm_parser = {
      82             :     .codec_ids      = { AV_CODEC_ID_PGM, AV_CODEC_ID_PGMYUV, AV_CODEC_ID_PPM,
      83             :                         AV_CODEC_ID_PBM, AV_CODEC_ID_PAM },
      84             :     .priv_data_size = sizeof(ParseContext),
      85             :     .parser_parse   = pnm_parse,
      86             :     .parser_close   = ff_parse_close,
      87             : };

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