GCC Code Coverage Report
Directory: ../../../ffmpeg/ Exec Total Coverage
File: src/libavcodec/bmp_parser.c Lines: 43 47 91.5 %
Date: 2019-11-22 03:34:36 Branches: 24 30 80.0 %

Line Branch Exec Source
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/*
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 * BMP parser
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 * Copyright (c) 2012 Paul B Mahol
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 *
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 * This file is part of FFmpeg.
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 *
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 * FFmpeg is free software; you can redistribute it and/or
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 * modify it under the terms of the GNU Lesser General Public
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 * License as published by the Free Software Foundation; either
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 * version 2.1 of the License, or (at your option) any later version.
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 *
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 * FFmpeg is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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 * Lesser General Public License for more details.
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 *
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 * You should have received a copy of the GNU Lesser General Public
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 * License along with FFmpeg; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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 */
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/**
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 * @file
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 * BMP parser
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 */
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#include "libavutil/bswap.h"
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#include "libavutil/common.h"
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#include "parser.h"
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typedef struct BMPParseContext {
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    ParseContext pc;
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    uint32_t fsize;
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    uint32_t remaining_size;
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} BMPParseContext;
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85
static int bmp_parse(AVCodecParserContext *s, AVCodecContext *avctx,
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                     const uint8_t **poutbuf, int *poutbuf_size,
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                     const uint8_t *buf, int buf_size)
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{
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85
    BMPParseContext *bpc = s->priv_data;
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85
    uint64_t state = bpc->pc.state64;
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85
    int next = END_NOT_FOUND;
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85
    int i = 0;
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    *poutbuf_size = 0;
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restart:
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119
    if (bpc->pc.frame_start_found <= 2+4+4) {
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3810
        for (; i < buf_size; i++) {
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3768
            state = (state << 8) | buf[i];
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3768
            if (bpc->pc.frame_start_found == 0) {
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3568
                if ((state >> 48) == (('B' << 8) | 'M')) {
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20
                    bpc->fsize = av_bswap32(state >> 16);
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20
                    if (bpc->fsize > 17)
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20
                        bpc->pc.frame_start_found = 1;
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                }
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200
            } else if (bpc->pc.frame_start_found == 2+4+4) {
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//                 unsigned hsize = av_bswap32(state>>32);
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20
                unsigned ihsize = av_bswap32(state);
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                if (ihsize < 12 || ihsize > 200) {
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                    bpc->pc.frame_start_found = 0;
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                    continue;
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                }
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20
                bpc->pc.frame_start_found++;
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20
                bpc->remaining_size = bpc->fsize + i - 17;
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20
                if (bpc->pc.index + i > 17) {
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3
                    next = i - 17;
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3
                    state = 0;
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3
                    break;
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                } else {
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17
                    bpc->pc.state64 = 0;
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17
                    goto restart;
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                }
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180
            } else if (bpc->pc.frame_start_found)
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180
                bpc->pc.frame_start_found++;
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        }
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45
        bpc->pc.state64 = state;
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    } else {
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57
        if (bpc->remaining_size) {
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57
            i = FFMIN(bpc->remaining_size, buf_size);
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57
            bpc->remaining_size -= i;
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57
            if (bpc->remaining_size)
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40
                goto flush;
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17
            bpc->pc.frame_start_found = 0;
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17
            goto restart;
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        }
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    }
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flush:
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85
    if (ff_combine_frame(&bpc->pc, next, &buf, &buf_size) < 0)
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54
        return buf_size;
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97

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    if (next != END_NOT_FOUND && next < 0)
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        bpc->pc.frame_start_found = FFMAX(bpc->pc.frame_start_found - i - 1, 0);
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    else
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31
        bpc->pc.frame_start_found = 0;
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102
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    *poutbuf      = buf;
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31
    *poutbuf_size = buf_size;
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31
    return next;
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}
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AVCodecParser ff_bmp_parser = {
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    .codec_ids      = { AV_CODEC_ID_BMP },
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    .priv_data_size = sizeof(BMPParseContext),
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    .parser_parse   = bmp_parse,
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    .parser_close   = ff_parse_close,
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};