FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/xbmdec.c
Date: 2026-04-24 19:58:39
Exec Total Coverage
Lines: 54 60 90.0%
Functions: 3 3 100.0%
Branches: 30 42 71.4%
Line Branch Exec Source
1 /*
2 * XBM image format
3 *
4 * Copyright (c) 2012 Paul B Mahol
5 *
6 * This file is part of FFmpeg.
7 *
8 * FFmpeg is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Lesser General Public
10 * License as published by the Free Software Foundation; either
11 * version 2.1 of the License, or (at your option) any later version.
12 *
13 * FFmpeg is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Lesser General Public License for more details.
17 *
18 * You should have received a copy of the GNU Lesser General Public
19 * License along with FFmpeg; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21 */
22
23 #include "libavutil/reverse.h"
24
25 #include "avcodec.h"
26 #include "codec_internal.h"
27 #include "decode.h"
28
29 1458922 static int get_nibble(uint8_t x)
30 {
31 #define TIMES256(idx) \
32 TIMES64(4 * (idx)) TIMES64(4 * (idx) + 1) TIMES64(4 * (idx) + 2) TIMES64(4 * (idx) + 3)
33 #define TIMES64(idx) \
34 TIMES16(4 * (idx)) TIMES16(4 * (idx) + 1) TIMES16(4 * (idx) + 2) TIMES16(4 * (idx) + 3)
35 #define TIMES16(idx) \
36 TIMES4(4 * (idx)) TIMES4(4 * (idx) + 1) TIMES4(4 * (idx) + 2) TIMES4(4 * (idx) + 3)
37 #define TIMES4(idx) \
38 ENTRY(4 * (idx)) ENTRY(4 * (idx) + 1) ENTRY(4 * (idx) + 2) ENTRY(4 * (idx) + 3)
39 #define ENTRY(x) [x] = ((x) >= 'a' && (x) <= 'f') ? (x) - ('a' - 10) : \
40 ((x) >= 'A' && (x) <= 'F') ? (x) - ('A' - 10) : \
41 ((x) >= '0' && (x) <= '9') ? (x) - '0' : 255,
42
43 static const uint8_t lut[] = {
44 TIMES256(0)
45 };
46 1458922 return lut[x];
47 }
48
49 90 static int parse_str_int(const uint8_t *p, const uint8_t *end, const uint8_t *key)
50 {
51 90 int keylen = strlen(key);
52 90 const uint8_t *e = end - keylen;
53
54
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 2384 for(; p < e; p++) {
55
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 2382 if (!memcmp(p, key, keylen))
56 88 break;
57 }
58 90 p += keylen;
59
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 90 if (p >= end)
60 2 return INT_MIN;
61
62
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 88 for(; p<end; p++) {
63 char *eptr;
64 88 int64_t ret = strtol(p, &eptr, 10);
65
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 88 if ((const uint8_t *)eptr != p)
66 88 return ret;
67 }
68 ✗ return INT_MIN;
69 }
70
71 45 static int xbm_decode_frame(AVCodecContext *avctx, AVFrame *p,
72 int *got_frame, AVPacket *avpkt)
73 {
74 int ret, linesize, i, j;
75 45 int width = 0;
76 45 int height = 0;
77 45 const uint8_t *end, *ptr = avpkt->data;
78 const uint8_t *next;
79 uint8_t *dst;
80
81 45 avctx->pix_fmt = AV_PIX_FMT_MONOWHITE;
82 45 end = avpkt->data + avpkt->size;
83
84 45 width = parse_str_int(avpkt->data, end, "_width");
85 45 height = parse_str_int(avpkt->data, end, "_height");
86
87
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 45 if ((ret = ff_set_dimensions(avctx, width, height)) < 0)
88 1 return ret;
89
90
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 44 if (avctx->skip_frame >= AVDISCARD_ALL)
91 4 return avpkt->size;
92
93
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 40 if ((ret = ff_get_buffer(avctx, p, 0)) < 0)
94 ✗ return ret;
95
96 // goto start of image data
97 40 next = memchr(ptr, '{', avpkt->size);
98
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 40 if (!next)
99 ✗ next = memchr(ptr, '(', avpkt->size);
100
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 40 if (!next)
101 ✗ return AVERROR_INVALIDDATA;
102 40 ptr = next + 1;
103
104 40 linesize = (avctx->width + 7) / 8;
105
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 11190 for (i = 0; i < avctx->height; i++) {
106 11150 dst = p->data[0] + i * p->linesize[0];
107
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 497452 for (j = 0; j < linesize; j++) {
108 uint8_t nib, val;
109
110
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 1956306 while (ptr < end && *ptr != 'x' && *ptr != '$')
111 1470004 ptr++;
112
113 486302 ptr ++;
114
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 486302 if (ptr < end && (val = get_nibble(*ptr)) <= 15) {
115 486302 ptr++;
116
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 486302 if ((nib = get_nibble(*ptr)) <= 15) {
117 486302 val = (val << 4) + nib;
118 486302 ptr++;
119 }
120 486302 *dst++ = ff_reverse[val];
121
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 486318 if ((val = get_nibble(*ptr)) <= 15 && j+1 < linesize) {
122 16 j++;
123 16 ptr++;
124
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 16 if ((nib = get_nibble(*ptr)) <= 15) {
125 16 val = (val << 4) + nib;
126 16 ptr++;
127 }
128 16 *dst++ = ff_reverse[val];
129 }
130 } else {
131 ✗ av_log(avctx, AV_LOG_ERROR,
132 "Unexpected data at %.8s.\n", ptr);
133 ✗ return AVERROR_INVALIDDATA;
134 }
135 }
136 }
137
138 40 *got_frame = 1;
139
140 40 return avpkt->size;
141 }
142
143 const FFCodec ff_xbm_decoder = {
144 .p.name = "xbm",
145 CODEC_LONG_NAME("XBM (X BitMap) image"),
146 .p.type = AVMEDIA_TYPE_VIDEO,
147 .p.id = AV_CODEC_ID_XBM,
148 .p.capabilities = AV_CODEC_CAP_DR1,
149 .caps_internal = FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM,
150 FF_CODEC_DECODE_CB(xbm_decode_frame),
151 };
152