FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavcodec/bmp_parser.c
Date: 2021-09-26 18:22:30
Exec Total Coverage
Lines: 44 48 91.7%
Branches: 24 30 80.0%

Line Branch Exec Source
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 88 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 88 BMPParseContext *bpc = s->priv_data;
43 88 uint64_t state = bpc->pc.state64;
44 88 int next = END_NOT_FOUND;
45 88 int i = 0;
46
47 88 *poutbuf_size = 0;
48 88 *poutbuf = NULL;
49
50 124 restart:
51
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124 if (bpc->pc.frame_start_found <= 2+4+4) {
52
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3831 for (; i < buf_size; i++) {
53 3786 state = (state << 8) | buf[i];
54
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3786 if (bpc->pc.frame_start_found == 0) {
55
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3576 if ((state >> 48) == (('B' << 8) | 'M')) {
56 21 bpc->fsize = av_bswap32(state >> 16);
57
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21 if (bpc->fsize > 17)
58 21 bpc->pc.frame_start_found = 1;
59 }
60
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210 } else if (bpc->pc.frame_start_found == 2+4+4) {
61 // unsigned hsize = av_bswap32(state>>32);
62 21 unsigned ihsize = av_bswap32(state);
63
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21 if (ihsize < 12 || ihsize > 200) {
64 bpc->pc.frame_start_found = 0;
65 continue;
66 }
67 21 bpc->pc.frame_start_found++;
68 21 bpc->remaining_size = bpc->fsize + i - 17;
69
70
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21 if (bpc->pc.index + i > 17) {
71 3 next = i - 17;
72 3 state = 0;
73 3 break;
74 } else {
75 18 bpc->pc.state64 = 0;
76 18 goto restart;
77 }
78
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189 } else if (bpc->pc.frame_start_found)
79 189 bpc->pc.frame_start_found++;
80 }
81 48 bpc->pc.state64 = state;
82 } else {
83
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58 if (bpc->remaining_size) {
84 58 i = FFMIN(bpc->remaining_size, buf_size);
85 58 bpc->remaining_size -= i;
86
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58 if (bpc->remaining_size)
87 40 goto flush;
88
89 18 bpc->pc.frame_start_found = 0;
90 18 goto restart;
91 }
92 }
93
94 flush:
95
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88 if (ff_combine_frame(&bpc->pc, next, &buf, &buf_size) < 0)
96 55 return buf_size;
97
98
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33 if (next != END_NOT_FOUND && next < 0)
99 bpc->pc.frame_start_found = FFMAX(bpc->pc.frame_start_found - i - 1, 0);
100 else
101 33 bpc->pc.frame_start_found = 0;
102
103 33 *poutbuf = buf;
104 33 *poutbuf_size = buf_size;
105 33 return next;
106 }
107
108 const AVCodecParser ff_bmp_parser = {
109 .codec_ids = { AV_CODEC_ID_BMP },
110 .priv_data_size = sizeof(BMPParseContext),
111 .parser_parse = bmp_parse,
112 .parser_close = ff_parse_close,
113 };
114