FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/pnm.c
Date: 2025-10-29 00:48:36
Exec Total Coverage
Lines: 120 158 75.9%
Functions: 3 3 100.0%
Branches: 104 168 61.9%
Line Branch Exec Source
1 /*
2 * PNM image format
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 <stdlib.h>
23 #include <string.h>
24
25 #include "libavutil/avassert.h"
26 #include "libavutil/imgutils.h"
27 #include "libavutil/avstring.h"
28 #include "avcodec.h"
29 #include "decode.h"
30 #include "pnm.h"
31
32 554427 static inline int pnm_space(int c)
33 {
34
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 554427 return c == ' ' || c == '\n' || c == '\r' || c == '\t';
35 }
36
37 110471 static void pnm_get(PNMContext *sc, char *str, int buf_size)
38 {
39 char *s;
40 int c;
41 110471 const uint8_t *bs = sc->bytestream;
42 110471 const uint8_t *end = sc->bytestream_end;
43
44 /* skip spaces and comments */
45
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 110473 while (bs < end) {
46 110473 c = *bs++;
47
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 110473 if (c == '#') {
48
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 90 while (c != '\n' && bs < end) {
49 88 c = *bs++;
50 }
51
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 110471 } else if (!pnm_space(c)) {
52 110471 break;
53 }
54 }
55
56 110471 s = str;
57
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 416450 while (bs < end && !pnm_space(c) && (s - str) < buf_size - 1) {
58 305979 *s++ = c;
59 305979 c = *bs++;
60 }
61 110471 *s = '\0';
62 110471 sc->bytestream = bs;
63 110471 }
64
65 27515 int ff_pnm_decode_header(AVCodecContext *avctx, PNMContext * const s)
66 {
67 char buf1[32], tuple_type[32];
68 int h, w, depth, maxval;
69 int ret;
70
71
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 27515 if (s->bytestream_end - s->bytestream < 3 ||
72
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 27506 s->bytestream[0] != 'P' ||
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 27506 (s->bytestream[1] < '1' ||
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 27506 s->bytestream[1] > '7' &&
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 56 s->bytestream[1] != 'f' &&
76
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 28 s->bytestream[1] != 'F' &&
77 ✗ s->bytestream[1] != 'H' &&
78 ✗ s->bytestream[1] != 'h')) {
79 9 s->bytestream += s->bytestream_end > s->bytestream;
80 9 s->bytestream += s->bytestream_end > s->bytestream;
81 9 return AVERROR_INVALIDDATA;
82 }
83 27506 pnm_get(s, buf1, sizeof(buf1));
84 27506 s->type= buf1[1]-'0';
85 27506 s->half = 0;
86
87
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 27506 if (buf1[1] == 'F') {
88 28 avctx->pix_fmt = AV_PIX_FMT_GBRPF32;
89
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 27478 } else if (buf1[1] == 'f') {
90 28 avctx->pix_fmt = AV_PIX_FMT_GRAYF32;
91
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 27450 } else if (buf1[1] == 'H') {
92 ✗ avctx->pix_fmt = AV_PIX_FMT_GBRPF32;
93 ✗ s->half = 1;
94
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 27450 } else if (buf1[1] == 'h') {
95 ✗ avctx->pix_fmt = AV_PIX_FMT_GRAYF32;
96 ✗ s->half = 1;
97
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 27450 } else if (s->type==1 || s->type==4) {
98 225 avctx->pix_fmt = AV_PIX_FMT_MONOWHITE;
99
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 27225 } else if (s->type==2 || s->type==5) {
100
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 26906 if (avctx->codec_id == AV_CODEC_ID_PGMYUV) {
101 26531 avctx->pix_fmt = AV_PIX_FMT_YUV420P;
102 26531 avctx->color_range = AVCOL_RANGE_MPEG;
103 } else {
104 375 avctx->pix_fmt = AV_PIX_FMT_GRAY8;
105 }
106
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 319 } else if (s->type==3 || s->type==6) {
107 235 avctx->pix_fmt = AV_PIX_FMT_RGB24;
108
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 84 } else if (s->type==7) {
109 84 w = -1;
110 84 h = -1;
111 84 maxval = -1;
112 84 depth = -1;
113 84 tuple_type[0] = '\0';
114 for (;;) {
115 504 pnm_get(s, buf1, sizeof(buf1));
116
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 504 if (!strcmp(buf1, "WIDTH")) {
117 84 pnm_get(s, buf1, sizeof(buf1));
118 84 w = strtol(buf1, NULL, 10);
119
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 420 } else if (!strcmp(buf1, "HEIGHT")) {
120 84 pnm_get(s, buf1, sizeof(buf1));
121 84 h = strtol(buf1, NULL, 10);
122
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 336 } else if (!strcmp(buf1, "DEPTH")) {
123 84 pnm_get(s, buf1, sizeof(buf1));
124 84 depth = strtol(buf1, NULL, 10);
125
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 252 } else if (!strcmp(buf1, "MAXVAL")) {
126 84 pnm_get(s, buf1, sizeof(buf1));
127 84 maxval = strtol(buf1, NULL, 10);
128
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 168 } else if (!strcmp(buf1, "TUPLTYPE") ||
129 /* libavcodec used to write invalid files */
130
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 84 !strcmp(buf1, "TUPLETYPE")) {
131 84 pnm_get(s, tuple_type, sizeof(tuple_type));
132
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 84 } else if (!strcmp(buf1, "ENDHDR")) {
133 84 break;
134 } else {
135 ✗ return AVERROR_INVALIDDATA;
136 }
137 }
138
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 84 if (!pnm_space(s->bytestream[-1]))
139 ✗ return AVERROR_INVALIDDATA;
140
141 /* check that all tags are present */
142
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 168 if (w <= 0 || h <= 0 || maxval <= 0 || maxval > UINT16_MAX || depth <= 0 || tuple_type[0] == '\0' ||
143
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 168 av_image_check_size(w, h, 0, avctx) || s->bytestream >= s->bytestream_end)
144 ✗ return AVERROR_INVALIDDATA;
145
146 84 ret = ff_set_dimensions(avctx, w, h);
147
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 84 if (ret < 0)
148 ✗ return ret;
149 84 s->maxval = maxval;
150
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 84 if (depth == 1) {
151
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 42 if (maxval == 1) {
152 14 avctx->pix_fmt = AV_PIX_FMT_MONOBLACK;
153
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 28 } else if (maxval < 256) {
154 14 avctx->pix_fmt = AV_PIX_FMT_GRAY8;
155 } else {
156 14 avctx->pix_fmt = AV_PIX_FMT_GRAY16;
157 }
158
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 42 } else if (depth == 2) {
159 ✗ if (maxval < 256) {
160 ✗ avctx->pix_fmt = AV_PIX_FMT_GRAY8A;
161 } else {
162 ✗ avctx->pix_fmt = AV_PIX_FMT_YA16;
163 }
164
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 42 } else if (depth == 3) {
165
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 28 if (maxval < 256) {
166 14 avctx->pix_fmt = AV_PIX_FMT_RGB24;
167 } else {
168 14 avctx->pix_fmt = AV_PIX_FMT_RGB48;
169 }
170
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 14 } else if (depth == 4) {
171
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 14 if (maxval < 256) {
172 14 avctx->pix_fmt = AV_PIX_FMT_RGBA;
173 } else {
174 ✗ avctx->pix_fmt = AV_PIX_FMT_RGBA64;
175 }
176 } else {
177 ✗ return AVERROR_INVALIDDATA;
178 }
179 84 return 0;
180 } else {
181 ✗ av_assert0(0);
182 }
183 27422 pnm_get(s, buf1, sizeof(buf1));
184 27422 w = atoi(buf1);
185 27422 pnm_get(s, buf1, sizeof(buf1));
186 27422 h = atoi(buf1);
187
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 27422 if(w <= 0 || h <= 0 || av_image_check_size(w, h, 0, avctx) || s->bytestream >= s->bytestream_end)
188 ✗ return AVERROR_INVALIDDATA;
189
190 27422 ret = ff_set_dimensions(avctx, w, h);
191
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 27422 if (ret < 0)
192 ✗ return ret;
193
194
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 27422 if (avctx->pix_fmt == AV_PIX_FMT_GBRPF32 || avctx->pix_fmt == AV_PIX_FMT_GRAYF32) {
195 56 pnm_get(s, buf1, sizeof(buf1));
196
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 56 if (av_sscanf(buf1, "%f", &s->scale) != 1 || s->scale == 0.0 || !isfinite(s->scale)) {
197 ✗ av_log(avctx, AV_LOG_ERROR, "Invalid scale.\n");
198 ✗ return AVERROR_INVALIDDATA;
199 }
200 56 s->endian = s->scale < 0.f;
201 56 s->scale = fabsf(s->scale);
202 56 s->maxval = (1ULL << 32) - 1;
203
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 27366 } else if (avctx->pix_fmt != AV_PIX_FMT_MONOWHITE && avctx->pix_fmt != AV_PIX_FMT_MONOBLACK) {
204 27141 pnm_get(s, buf1, sizeof(buf1));
205 27141 s->maxval = atoi(buf1);
206
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 27141 if (s->maxval <= 0 || s->maxval > UINT16_MAX) {
207 ✗ av_log(avctx, AV_LOG_ERROR, "Invalid maxval: %d\n", s->maxval);
208 ✗ s->maxval = 255;
209 }
210
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 27141 if (s->maxval >= 256) {
211 ✗ if (avctx->pix_fmt == AV_PIX_FMT_GRAY8) {
212 ✗ avctx->pix_fmt = AV_PIX_FMT_GRAY16;
213 ✗ } else if (avctx->pix_fmt == AV_PIX_FMT_RGB24) {
214 ✗ avctx->pix_fmt = AV_PIX_FMT_RGB48;
215 ✗ } else if (avctx->pix_fmt == AV_PIX_FMT_YUV420P && s->maxval < 65536) {
216 ✗ if (s->maxval < 512)
217 ✗ avctx->pix_fmt = AV_PIX_FMT_YUV420P9;
218 ✗ else if (s->maxval < 1024)
219 ✗ avctx->pix_fmt = AV_PIX_FMT_YUV420P10;
220 else
221 ✗ avctx->pix_fmt = AV_PIX_FMT_YUV420P16;
222 } else {
223 ✗ av_log(avctx, AV_LOG_ERROR, "Unsupported pixel format\n");
224 ✗ avctx->pix_fmt = AV_PIX_FMT_NONE;
225 ✗ return AVERROR_INVALIDDATA;
226 }
227 }
228 }else
229 225 s->maxval=1;
230
231
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 27422 if (!pnm_space(s->bytestream[-1]))
232 ✗ return AVERROR_INVALIDDATA;
233
234 /* more check if YUV420 */
235
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 27422 if ((av_pix_fmt_desc_get(avctx->pix_fmt)->flags & AV_PIX_FMT_FLAG_PLANAR) &&
236
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 26559 avctx->pix_fmt != AV_PIX_FMT_GBRPF32) {
237
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 26531 if ((avctx->width & 1) != 0)
238 ✗ return AVERROR_INVALIDDATA;
239 26531 h = (avctx->height * 2);
240
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 26531 if ((h % 3) != 0)
241 ✗ return AVERROR_INVALIDDATA;
242 26531 h /= 3;
243 26531 avctx->height = h;
244 }
245 27422 return 0;
246 }
247