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 "internal.h"
30 #include "pnm.h"
31
pnm_space(int c)32 static inline int pnm_space(int c)
33 {
34 return c == ' ' || c == '\n' || c == '\r' || c == '\t';
35 }
36
pnm_get(PNMContext * sc,char * str,int buf_size)37 static void pnm_get(PNMContext *sc, char *str, int buf_size)
38 {
39 char *s;
40 int c;
41 uint8_t *bs = sc->bytestream;
42 const uint8_t *end = sc->bytestream_end;
43
44 /* skip spaces and comments */
45 while (bs < end) {
46 c = *bs++;
47 if (c == '#') {
48 while (c != '\n' && bs < end) {
49 c = *bs++;
50 }
51 } else if (!pnm_space(c)) {
52 break;
53 }
54 }
55
56 s = str;
57 while (bs < end && !pnm_space(c) && (s - str) < buf_size - 1) {
58 *s++ = c;
59 c = *bs++;
60 }
61 *s = '\0';
62 sc->bytestream = bs;
63 }
64
ff_pnm_decode_header(AVCodecContext * avctx,PNMContext * const s)65 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 if (s->bytestream_end - s->bytestream < 3 ||
72 s->bytestream[0] != 'P' ||
73 (s->bytestream[1] < '1' ||
74 s->bytestream[1] > '7' &&
75 s->bytestream[1] != 'F')) {
76 s->bytestream += s->bytestream_end > s->bytestream;
77 s->bytestream += s->bytestream_end > s->bytestream;
78 return AVERROR_INVALIDDATA;
79 }
80 pnm_get(s, buf1, sizeof(buf1));
81 s->type= buf1[1]-'0';
82
83 if (buf1[1] == 'F') {
84 avctx->pix_fmt = AV_PIX_FMT_GBRPF32;
85 } else if (s->type==1 || s->type==4) {
86 avctx->pix_fmt = AV_PIX_FMT_MONOWHITE;
87 } else if (s->type==2 || s->type==5) {
88 if (avctx->codec_id == AV_CODEC_ID_PGMYUV)
89 avctx->pix_fmt = AV_PIX_FMT_YUV420P;
90 else
91 avctx->pix_fmt = AV_PIX_FMT_GRAY8;
92 } else if (s->type==3 || s->type==6) {
93 avctx->pix_fmt = AV_PIX_FMT_RGB24;
94 } else if (s->type==7) {
95 w = -1;
96 h = -1;
97 maxval = -1;
98 depth = -1;
99 tuple_type[0] = '\0';
100 for (;;) {
101 pnm_get(s, buf1, sizeof(buf1));
102 if (!strcmp(buf1, "WIDTH")) {
103 pnm_get(s, buf1, sizeof(buf1));
104 w = strtol(buf1, NULL, 10);
105 } else if (!strcmp(buf1, "HEIGHT")) {
106 pnm_get(s, buf1, sizeof(buf1));
107 h = strtol(buf1, NULL, 10);
108 } else if (!strcmp(buf1, "DEPTH")) {
109 pnm_get(s, buf1, sizeof(buf1));
110 depth = strtol(buf1, NULL, 10);
111 } else if (!strcmp(buf1, "MAXVAL")) {
112 pnm_get(s, buf1, sizeof(buf1));
113 maxval = strtol(buf1, NULL, 10);
114 } else if (!strcmp(buf1, "TUPLTYPE") ||
115 /* libavcodec used to write invalid files */
116 !strcmp(buf1, "TUPLETYPE")) {
117 pnm_get(s, tuple_type, sizeof(tuple_type));
118 } else if (!strcmp(buf1, "ENDHDR")) {
119 break;
120 } else {
121 return AVERROR_INVALIDDATA;
122 }
123 }
124 if (!pnm_space(s->bytestream[-1]))
125 return AVERROR_INVALIDDATA;
126
127 /* check that all tags are present */
128 if (w <= 0 || h <= 0 || maxval <= 0 || maxval > UINT16_MAX || depth <= 0 || tuple_type[0] == '\0' ||
129 av_image_check_size(w, h, 0, avctx) || s->bytestream >= s->bytestream_end)
130 return AVERROR_INVALIDDATA;
131
132 ret = ff_set_dimensions(avctx, w, h);
133 if (ret < 0)
134 return ret;
135 s->maxval = maxval;
136 if (depth == 1) {
137 if (maxval == 1) {
138 avctx->pix_fmt = AV_PIX_FMT_MONOBLACK;
139 } else if (maxval < 256) {
140 avctx->pix_fmt = AV_PIX_FMT_GRAY8;
141 } else {
142 avctx->pix_fmt = AV_PIX_FMT_GRAY16;
143 }
144 } else if (depth == 2) {
145 if (maxval < 256) {
146 avctx->pix_fmt = AV_PIX_FMT_GRAY8A;
147 } else {
148 avctx->pix_fmt = AV_PIX_FMT_YA16;
149 }
150 } else if (depth == 3) {
151 if (maxval < 256) {
152 avctx->pix_fmt = AV_PIX_FMT_RGB24;
153 } else {
154 avctx->pix_fmt = AV_PIX_FMT_RGB48;
155 }
156 } else if (depth == 4) {
157 if (maxval < 256) {
158 avctx->pix_fmt = AV_PIX_FMT_RGBA;
159 } else {
160 avctx->pix_fmt = AV_PIX_FMT_RGBA64;
161 }
162 } else {
163 return AVERROR_INVALIDDATA;
164 }
165 return 0;
166 } else {
167 av_assert0(0);
168 }
169 pnm_get(s, buf1, sizeof(buf1));
170 w = atoi(buf1);
171 pnm_get(s, buf1, sizeof(buf1));
172 h = atoi(buf1);
173 if(w <= 0 || h <= 0 || av_image_check_size(w, h, 0, avctx) || s->bytestream >= s->bytestream_end)
174 return AVERROR_INVALIDDATA;
175
176 ret = ff_set_dimensions(avctx, w, h);
177 if (ret < 0)
178 return ret;
179
180 if (avctx->pix_fmt == AV_PIX_FMT_GBRPF32) {
181 pnm_get(s, buf1, sizeof(buf1));
182 if (av_sscanf(buf1, "%f", &s->scale) != 1 || s->scale == 0.0 || !isfinite(s->scale)) {
183 av_log(avctx, AV_LOG_ERROR, "Invalid scale.\n");
184 return AVERROR_INVALIDDATA;
185 }
186 s->endian = s->scale < 0.f;
187 s->scale = fabsf(s->scale);
188 s->maxval = (1ULL << 32) - 1;
189 } else if (avctx->pix_fmt != AV_PIX_FMT_MONOWHITE && avctx->pix_fmt != AV_PIX_FMT_MONOBLACK) {
190 pnm_get(s, buf1, sizeof(buf1));
191 s->maxval = atoi(buf1);
192 if (s->maxval <= 0 || s->maxval > UINT16_MAX) {
193 av_log(avctx, AV_LOG_ERROR, "Invalid maxval: %d\n", s->maxval);
194 s->maxval = 255;
195 }
196 if (s->maxval >= 256) {
197 if (avctx->pix_fmt == AV_PIX_FMT_GRAY8) {
198 avctx->pix_fmt = AV_PIX_FMT_GRAY16;
199 } else if (avctx->pix_fmt == AV_PIX_FMT_RGB24) {
200 avctx->pix_fmt = AV_PIX_FMT_RGB48;
201 } else if (avctx->pix_fmt == AV_PIX_FMT_YUV420P && s->maxval < 65536) {
202 if (s->maxval < 512)
203 avctx->pix_fmt = AV_PIX_FMT_YUV420P9;
204 else if (s->maxval < 1024)
205 avctx->pix_fmt = AV_PIX_FMT_YUV420P10;
206 else
207 avctx->pix_fmt = AV_PIX_FMT_YUV420P16;
208 } else {
209 av_log(avctx, AV_LOG_ERROR, "Unsupported pixel format\n");
210 avctx->pix_fmt = AV_PIX_FMT_NONE;
211 return AVERROR_INVALIDDATA;
212 }
213 }
214 }else
215 s->maxval=1;
216
217 if (!pnm_space(s->bytestream[-1]))
218 return AVERROR_INVALIDDATA;
219
220 /* more check if YUV420 */
221 if (av_pix_fmt_desc_get(avctx->pix_fmt)->flags & AV_PIX_FMT_FLAG_PLANAR) {
222 if ((avctx->width & 1) != 0)
223 return AVERROR_INVALIDDATA;
224 h = (avctx->height * 2);
225 if ((h % 3) != 0)
226 return AVERROR_INVALIDDATA;
227 h /= 3;
228 avctx->height = h;
229 }
230 return 0;
231 }
232