sunrast.c
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1 /*
2  * Sun Rasterfile (.sun/.ras/im{1,8,24}/.sunras) image decoder
3  * Copyright (c) 2007, 2008 Ivo van Poorten
4  *
5  * This file is part of Libav.
6  *
7  * Libav 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  * Libav 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 Libav; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21 
22 #include "libavutil/intreadwrite.h"
23 #include "libavutil/imgutils.h"
24 #include "avcodec.h"
25 
26 #define RT_OLD 0
27 #define RT_STANDARD 1
28 #define RT_BYTE_ENCODED 2
29 #define RT_FORMAT_RGB 3
30 #define RT_FORMAT_TIFF 4
31 #define RT_FORMAT_IFF 5
32 
33 typedef struct SUNRASTContext {
36 
37 static av_cold int sunrast_init(AVCodecContext *avctx) {
38  SUNRASTContext *s = avctx->priv_data;
39 
41  avctx->coded_frame= &s->picture;
42 
43  return 0;
44 }
45 
46 static int sunrast_decode_frame(AVCodecContext *avctx, void *data,
47  int *data_size, AVPacket *avpkt) {
48  const uint8_t *buf = avpkt->data;
49  const uint8_t *buf_end = avpkt->data + avpkt->size;
50  SUNRASTContext * const s = avctx->priv_data;
51  AVFrame *picture = data;
52  AVFrame * const p = &s->picture;
53  unsigned int w, h, depth, type, maptype, maplength, stride, x, y, len, alen;
54  uint8_t *ptr;
55  const uint8_t *bufstart = buf;
56 
57  if (avpkt->size < 32)
58  return AVERROR_INVALIDDATA;
59 
60  if (AV_RB32(buf) != 0x59a66a95) {
61  av_log(avctx, AV_LOG_ERROR, "this is not sunras encoded data\n");
62  return -1;
63  }
64 
65  w = AV_RB32(buf+4);
66  h = AV_RB32(buf+8);
67  depth = AV_RB32(buf+12);
68  type = AV_RB32(buf+20);
69  maptype = AV_RB32(buf+24);
70  maplength = AV_RB32(buf+28);
71  buf += 32;
72 
73  if (type == RT_FORMAT_TIFF || type == RT_FORMAT_IFF) {
74  av_log(avctx, AV_LOG_ERROR, "unsupported (compression) type\n");
75  return -1;
76  }
77  if (type < RT_OLD || type > RT_FORMAT_IFF) {
78  av_log(avctx, AV_LOG_ERROR, "invalid (compression) type\n");
79  return -1;
80  }
81  if (av_image_check_size(w, h, 0, avctx)) {
82  av_log(avctx, AV_LOG_ERROR, "invalid image size\n");
83  return -1;
84  }
85  if (maptype & ~1) {
86  av_log(avctx, AV_LOG_ERROR, "invalid colormap type\n");
87  return -1;
88  }
89 
90 
91  switch (depth) {
92  case 1:
93  avctx->pix_fmt = PIX_FMT_MONOWHITE;
94  break;
95  case 8:
96  avctx->pix_fmt = PIX_FMT_PAL8;
97  break;
98  case 24:
99  avctx->pix_fmt = (type == RT_FORMAT_RGB) ? PIX_FMT_RGB24 : PIX_FMT_BGR24;
100  break;
101  default:
102  av_log(avctx, AV_LOG_ERROR, "invalid depth\n");
103  return -1;
104  }
105 
106  if (p->data[0])
107  avctx->release_buffer(avctx, p);
108 
109  if (w != avctx->width || h != avctx->height)
110  avcodec_set_dimensions(avctx, w, h);
111  if (avctx->get_buffer(avctx, p) < 0) {
112  av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
113  return -1;
114  }
115 
117 
118  if (buf_end - buf < maplength)
119  return AVERROR_INVALIDDATA;
120 
121  if (depth != 8 && maplength) {
122  av_log(avctx, AV_LOG_WARNING, "useless colormap found or file is corrupted, trying to recover\n");
123 
124  } else if (depth == 8) {
125  unsigned int len = maplength / 3;
126 
127  if (!maplength) {
128  av_log(avctx, AV_LOG_ERROR, "colormap expected\n");
129  return -1;
130  }
131  if (maplength % 3 || maplength > 768) {
132  av_log(avctx, AV_LOG_WARNING, "invalid colormap length\n");
133  return -1;
134  }
135 
136  ptr = p->data[1];
137  for (x=0; x<len; x++, ptr+=4)
138  *(uint32_t *)ptr = (buf[x]<<16) + (buf[len+x]<<8) + buf[len+len+x];
139  }
140 
141  buf += maplength;
142 
143  ptr = p->data[0];
144  stride = p->linesize[0];
145 
146  /* scanlines are aligned on 16 bit boundaries */
147  len = (depth * w + 7) >> 3;
148  alen = len + (len&1);
149 
150  if (type == RT_BYTE_ENCODED) {
151  int value, run;
152  uint8_t *end = ptr + h*stride;
153 
154  x = 0;
155  while (ptr != end && buf < buf_end) {
156  run = 1;
157  if (buf_end - buf < 1)
158  return AVERROR_INVALIDDATA;
159 
160  if ((value = *buf++) == 0x80) {
161  run = *buf++ + 1;
162  if (run != 1)
163  value = *buf++;
164  }
165  while (run--) {
166  if (x < len)
167  ptr[x] = value;
168  if (++x >= alen) {
169  x = 0;
170  ptr += stride;
171  if (ptr == end)
172  break;
173  }
174  }
175  }
176  } else {
177  for (y=0; y<h; y++) {
178  if (buf_end - buf < len)
179  break;
180  memcpy(ptr, buf, len);
181  ptr += stride;
182  buf += alen;
183  }
184  }
185 
186  *picture = s->picture;
187  *data_size = sizeof(AVFrame);
188 
189  return buf - bufstart;
190 }
191 
192 static av_cold int sunrast_end(AVCodecContext *avctx) {
193  SUNRASTContext *s = avctx->priv_data;
194 
195  if(s->picture.data[0])
196  avctx->release_buffer(avctx, &s->picture);
197 
198  return 0;
199 }
200 
202  .name = "sunrast",
203  .type = AVMEDIA_TYPE_VIDEO,
204  .id = CODEC_ID_SUNRAST,
205  .priv_data_size = sizeof(SUNRASTContext),
206  .init = sunrast_init,
207  .close = sunrast_end,
209  .capabilities = CODEC_CAP_DR1,
210  .long_name = NULL_IF_CONFIG_SMALL("Sun Rasterfile image"),
211 };