Coverage Report

Created: 2024-05-04 12:45

/proc/self/cwd/external/libjpeg_turbo/jdapimin.c
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Source (jump to first uncovered line)
1
/*
2
 * jdapimin.c
3
 *
4
 * This file was part of the Independent JPEG Group's software:
5
 * Copyright (C) 1994-1998, Thomas G. Lane.
6
 * libjpeg-turbo Modifications:
7
 * Copyright (C) 2016, 2022, D. R. Commander.
8
 * For conditions of distribution and use, see the accompanying README.ijg
9
 * file.
10
 *
11
 * This file contains application interface code for the decompression half
12
 * of the JPEG library.  These are the "minimum" API routines that may be
13
 * needed in either the normal full-decompression case or the
14
 * transcoding-only case.
15
 *
16
 * Most of the routines intended to be called directly by an application
17
 * are in this file or in jdapistd.c.  But also see jcomapi.c for routines
18
 * shared by compression and decompression, and jdtrans.c for the transcoding
19
 * case.
20
 */
21
22
#define JPEG_INTERNALS
23
#include "jinclude.h"
24
#include "jpeglib.h"
25
#include "jdmaster.h"
26
#include "jconfigint.h"
27
28
29
/*
30
 * Initialization of a JPEG decompression object.
31
 * The error manager must already be set up (in case memory manager fails).
32
 */
33
34
GLOBAL(void)
35
jpeg_CreateDecompress(j_decompress_ptr cinfo, int version, size_t structsize)
36
3.60k
{
37
3.60k
  int i;
38
39
  /* Guard against version mismatches between library and caller. */
40
3.60k
  cinfo->mem = NULL;            /* so jpeg_destroy knows mem mgr not called */
41
3.60k
  if (version != JPEG_LIB_VERSION)
42
0
    ERREXIT2(cinfo, JERR_BAD_LIB_VERSION, JPEG_LIB_VERSION, version);
43
3.60k
  if (structsize != sizeof(struct jpeg_decompress_struct))
44
0
    ERREXIT2(cinfo, JERR_BAD_STRUCT_SIZE,
45
3.60k
             (int)sizeof(struct jpeg_decompress_struct), (int)structsize);
46
47
  /* For debugging purposes, we zero the whole master structure.
48
   * But the application has already set the err pointer, and may have set
49
   * client_data, so we have to save and restore those fields.
50
   * Note: if application hasn't set client_data, tools like Purify may
51
   * complain here.
52
   */
53
3.60k
  {
54
3.60k
    struct jpeg_error_mgr *err = cinfo->err;
55
3.60k
    void *client_data = cinfo->client_data; /* ignore Purify complaint here */
56
3.60k
    memset(cinfo, 0, sizeof(struct jpeg_decompress_struct));
57
3.60k
    cinfo->err = err;
58
3.60k
    cinfo->client_data = client_data;
59
3.60k
  }
60
3.60k
  cinfo->is_decompressor = TRUE;
61
62
  /* Initialize a memory manager instance for this object */
63
3.60k
  jinit_memory_mgr((j_common_ptr)cinfo);
64
65
  /* Zero out pointers to permanent structures. */
66
3.60k
  cinfo->progress = NULL;
67
3.60k
  cinfo->src = NULL;
68
69
18.0k
  for (i = 0; i < NUM_QUANT_TBLS; i++)
70
14.4k
    cinfo->quant_tbl_ptrs[i] = NULL;
71
72
18.0k
  for (i = 0; i < NUM_HUFF_TBLS; i++) {
73
14.4k
    cinfo->dc_huff_tbl_ptrs[i] = NULL;
74
14.4k
    cinfo->ac_huff_tbl_ptrs[i] = NULL;
75
14.4k
  }
76
77
  /* Initialize marker processor so application can override methods
78
   * for COM, APPn markers before calling jpeg_read_header.
79
   */
80
3.60k
  cinfo->marker_list = NULL;
81
3.60k
  jinit_marker_reader(cinfo);
82
83
  /* And initialize the overall input controller. */
84
3.60k
  jinit_input_controller(cinfo);
85
86
  /* OK, I'm ready */
87
3.60k
  cinfo->global_state = DSTATE_START;
88
89
  /* The master struct is used to store extension parameters, so we allocate it
90
   * here.
91
   */
92
3.60k
  cinfo->master = (struct jpeg_decomp_master *)
93
3.60k
    (*cinfo->mem->alloc_small) ((j_common_ptr)cinfo, JPOOL_PERMANENT,
94
3.60k
                                sizeof(my_decomp_master));
95
3.60k
  memset(cinfo->master, 0, sizeof(my_decomp_master));
96
3.60k
}
97
98
99
/*
100
 * Destruction of a JPEG decompression object
101
 */
102
103
GLOBAL(void)
104
jpeg_destroy_decompress(j_decompress_ptr cinfo)
105
796
{
106
796
  jpeg_destroy((j_common_ptr)cinfo); /* use common routine */
107
796
}
108
109
110
/*
111
 * Abort processing of a JPEG decompression operation,
112
 * but don't destroy the object itself.
113
 */
114
115
GLOBAL(void)
116
jpeg_abort_decompress(j_decompress_ptr cinfo)
117
0
{
118
0
  jpeg_abort((j_common_ptr)cinfo); /* use common routine */
119
0
}
120
121
122
/*
123
 * Set default decompression parameters.
124
 */
125
126
LOCAL(void)
127
default_decompress_parms(j_decompress_ptr cinfo)
128
124
{
129
  /* Guess the input colorspace, and set output colorspace accordingly. */
130
  /* (Wish JPEG committee had provided a real way to specify this...) */
131
  /* Note application may override our guesses. */
132
124
  switch (cinfo->num_components) {
133
20
  case 1:
134
20
    cinfo->jpeg_color_space = JCS_GRAYSCALE;
135
20
    cinfo->out_color_space = JCS_GRAYSCALE;
136
20
    break;
137
138
101
  case 3:
139
101
    if (cinfo->saw_JFIF_marker) {
140
9
      cinfo->jpeg_color_space = JCS_YCbCr; /* JFIF implies YCbCr */
141
92
    } else if (cinfo->saw_Adobe_marker) {
142
1
      switch (cinfo->Adobe_transform) {
143
0
      case 0:
144
0
        cinfo->jpeg_color_space = JCS_RGB;
145
0
        break;
146
1
      case 1:
147
1
        cinfo->jpeg_color_space = JCS_YCbCr;
148
1
        break;
149
0
      default:
150
0
        WARNMS1(cinfo, JWRN_ADOBE_XFORM, cinfo->Adobe_transform);
151
0
        cinfo->jpeg_color_space = JCS_YCbCr; /* assume it's YCbCr */
152
0
        break;
153
1
      }
154
91
    } else {
155
      /* Saw no special markers, try to guess from the component IDs */
156
91
      int cid0 = cinfo->comp_info[0].component_id;
157
91
      int cid1 = cinfo->comp_info[1].component_id;
158
91
      int cid2 = cinfo->comp_info[2].component_id;
159
160
91
      if (cid0 == 1 && cid1 == 2 && cid2 == 3)
161
58
        cinfo->jpeg_color_space = JCS_YCbCr; /* assume JFIF w/out marker */
162
33
      else if (cid0 == 82 && cid1 == 71 && cid2 == 66)
163
0
        cinfo->jpeg_color_space = JCS_RGB; /* ASCII 'R', 'G', 'B' */
164
33
      else {
165
33
        TRACEMS3(cinfo, 1, JTRC_UNKNOWN_IDS, cid0, cid1, cid2);
166
33
        cinfo->jpeg_color_space = JCS_YCbCr; /* assume it's YCbCr */
167
33
      }
168
91
    }
169
    /* Always guess RGB is proper output colorspace. */
170
101
    cinfo->out_color_space = JCS_RGB;
171
101
    break;
172
173
3
  case 4:
174
3
    if (cinfo->saw_Adobe_marker) {
175
0
      switch (cinfo->Adobe_transform) {
176
0
      case 0:
177
0
        cinfo->jpeg_color_space = JCS_CMYK;
178
0
        break;
179
0
      case 2:
180
0
        cinfo->jpeg_color_space = JCS_YCCK;
181
0
        break;
182
0
      default:
183
0
        WARNMS1(cinfo, JWRN_ADOBE_XFORM, cinfo->Adobe_transform);
184
0
        cinfo->jpeg_color_space = JCS_YCCK; /* assume it's YCCK */
185
0
        break;
186
0
      }
187
3
    } else {
188
      /* No special markers, assume straight CMYK. */
189
3
      cinfo->jpeg_color_space = JCS_CMYK;
190
3
    }
191
3
    cinfo->out_color_space = JCS_CMYK;
192
3
    break;
193
194
0
  default:
195
0
    cinfo->jpeg_color_space = JCS_UNKNOWN;
196
0
    cinfo->out_color_space = JCS_UNKNOWN;
197
0
    break;
198
124
  }
199
200
  /* Set defaults for other decompression parameters. */
201
124
  cinfo->scale_num = 1;         /* 1:1 scaling */
202
124
  cinfo->scale_denom = 1;
203
124
  cinfo->output_gamma = 1.0;
204
124
  cinfo->buffered_image = FALSE;
205
124
  cinfo->raw_data_out = FALSE;
206
124
  cinfo->dct_method = JDCT_DEFAULT;
207
124
  cinfo->do_fancy_upsampling = TRUE;
208
124
  cinfo->do_block_smoothing = TRUE;
209
124
  cinfo->quantize_colors = FALSE;
210
  /* We set these in case application only sets quantize_colors. */
211
124
  cinfo->dither_mode = JDITHER_FS;
212
124
#ifdef QUANT_2PASS_SUPPORTED
213
124
  cinfo->two_pass_quantize = TRUE;
214
#else
215
  cinfo->two_pass_quantize = FALSE;
216
#endif
217
124
  cinfo->desired_number_of_colors = 256;
218
124
  cinfo->colormap = NULL;
219
  /* Initialize for no mode change in buffered-image mode. */
220
124
  cinfo->enable_1pass_quant = FALSE;
221
124
  cinfo->enable_external_quant = FALSE;
222
124
  cinfo->enable_2pass_quant = FALSE;
223
124
}
224
225
226
/*
227
 * Decompression startup: read start of JPEG datastream to see what's there.
228
 * Need only initialize JPEG object and supply a data source before calling.
229
 *
230
 * This routine will read as far as the first SOS marker (ie, actual start of
231
 * compressed data), and will save all tables and parameters in the JPEG
232
 * object.  It will also initialize the decompression parameters to default
233
 * values, and finally return JPEG_HEADER_OK.  On return, the application may
234
 * adjust the decompression parameters and then call jpeg_start_decompress.
235
 * (Or, if the application only wanted to determine the image parameters,
236
 * the data need not be decompressed.  In that case, call jpeg_abort or
237
 * jpeg_destroy to release any temporary space.)
238
 * If an abbreviated (tables only) datastream is presented, the routine will
239
 * return JPEG_HEADER_TABLES_ONLY upon reaching EOI.  The application may then
240
 * re-use the JPEG object to read the abbreviated image datastream(s).
241
 * It is unnecessary (but OK) to call jpeg_abort in this case.
242
 * The JPEG_SUSPENDED return code only occurs if the data source module
243
 * requests suspension of the decompressor.  In this case the application
244
 * should load more source data and then re-call jpeg_read_header to resume
245
 * processing.
246
 * If a non-suspending data source is used and require_image is TRUE, then the
247
 * return code need not be inspected since only JPEG_HEADER_OK is possible.
248
 *
249
 * This routine is now just a front end to jpeg_consume_input, with some
250
 * extra error checking.
251
 */
252
253
GLOBAL(int)
254
jpeg_read_header(j_decompress_ptr cinfo, boolean require_image)
255
3.60k
{
256
3.60k
  int retcode;
257
258
3.60k
  if (cinfo->global_state != DSTATE_START &&
259
3.60k
      cinfo->global_state != DSTATE_INHEADER)
260
0
    ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state);
261
262
3.60k
  retcode = jpeg_consume_input(cinfo);
263
264
3.60k
  switch (retcode) {
265
124
  case JPEG_REACHED_SOS:
266
124
    retcode = JPEG_HEADER_OK;
267
124
    break;
268
5
  case JPEG_REACHED_EOI:
269
5
    if (require_image)          /* Complain if application wanted an image */
270
5
      ERREXIT(cinfo, JERR_NO_IMAGE);
271
    /* Reset to start state; it would be safer to require the application to
272
     * call jpeg_abort, but we can't change it now for compatibility reasons.
273
     * A side effect is to free any temporary memory (there shouldn't be any).
274
     */
275
5
    jpeg_abort((j_common_ptr)cinfo); /* sets state = DSTATE_START */
276
5
    retcode = JPEG_HEADER_TABLES_ONLY;
277
5
    break;
278
1.19k
  case JPEG_SUSPENDED:
279
    /* no work */
280
1.19k
    break;
281
3.60k
  }
282
283
1.31k
  return retcode;
284
3.60k
}
285
286
287
/*
288
 * Consume data in advance of what the decompressor requires.
289
 * This can be called at any time once the decompressor object has
290
 * been created and a data source has been set up.
291
 *
292
 * This routine is essentially a state machine that handles a couple
293
 * of critical state-transition actions, namely initial setup and
294
 * transition from header scanning to ready-for-start_decompress.
295
 * All the actual input is done via the input controller's consume_input
296
 * method.
297
 */
298
299
GLOBAL(int)
300
jpeg_consume_input(j_decompress_ptr cinfo)
301
3.60k
{
302
3.60k
  int retcode = JPEG_SUSPENDED;
303
304
  /* NB: every possible DSTATE value should be listed in this switch */
305
3.60k
  switch (cinfo->global_state) {
306
3.60k
  case DSTATE_START:
307
    /* Start-of-datastream actions: reset appropriate modules */
308
3.60k
    (*cinfo->inputctl->reset_input_controller) (cinfo);
309
    /* Initialize application's data source module */
310
3.60k
    (*cinfo->src->init_source) (cinfo);
311
3.60k
    cinfo->global_state = DSTATE_INHEADER;
312
    FALLTHROUGH                 /*FALLTHROUGH*/
313
3.60k
  case DSTATE_INHEADER:
314
3.60k
    retcode = (*cinfo->inputctl->consume_input) (cinfo);
315
3.60k
    if (retcode == JPEG_REACHED_SOS) { /* Found SOS, prepare to decompress */
316
      /* Set up default parameters based on header data */
317
124
      default_decompress_parms(cinfo);
318
      /* Set global state: ready for start_decompress */
319
124
      cinfo->global_state = DSTATE_READY;
320
124
    }
321
3.60k
    break;
322
0
  case DSTATE_READY:
323
    /* Can't advance past first SOS until start_decompress is called */
324
0
    retcode = JPEG_REACHED_SOS;
325
0
    break;
326
0
  case DSTATE_PRELOAD:
327
0
  case DSTATE_PRESCAN:
328
0
  case DSTATE_SCANNING:
329
0
  case DSTATE_RAW_OK:
330
0
  case DSTATE_BUFIMAGE:
331
0
  case DSTATE_BUFPOST:
332
0
  case DSTATE_STOPPING:
333
0
    retcode = (*cinfo->inputctl->consume_input) (cinfo);
334
0
    break;
335
0
  default:
336
0
    ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state);
337
3.60k
  }
338
1.32k
  return retcode;
339
3.60k
}
340
341
342
/*
343
 * Have we finished reading the input file?
344
 */
345
346
GLOBAL(boolean)
347
jpeg_input_complete(j_decompress_ptr cinfo)
348
0
{
349
  /* Check for valid jpeg object */
350
0
  if (cinfo->global_state < DSTATE_START ||
351
0
      cinfo->global_state > DSTATE_STOPPING)
352
0
    ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state);
353
0
  return cinfo->inputctl->eoi_reached;
354
0
}
355
356
357
/*
358
 * Is there more than one scan?
359
 */
360
361
GLOBAL(boolean)
362
jpeg_has_multiple_scans(j_decompress_ptr cinfo)
363
0
{
364
  /* Only valid after jpeg_read_header completes */
365
0
  if (cinfo->global_state < DSTATE_READY ||
366
0
      cinfo->global_state > DSTATE_STOPPING)
367
0
    ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state);
368
0
  return cinfo->inputctl->has_multiple_scans;
369
0
}
370
371
372
/*
373
 * Finish JPEG decompression.
374
 *
375
 * This will normally just verify the file trailer and release temp storage.
376
 *
377
 * Returns FALSE if suspended.  The return value need be inspected only if
378
 * a suspending data source is used.
379
 */
380
381
GLOBAL(boolean)
382
jpeg_finish_decompress(j_decompress_ptr cinfo)
383
23
{
384
23
  if ((cinfo->global_state == DSTATE_SCANNING ||
385
23
       cinfo->global_state == DSTATE_RAW_OK) && !cinfo->buffered_image) {
386
    /* Terminate final pass of non-buffered mode */
387
23
    if (cinfo->output_scanline < cinfo->output_height)
388
0
      ERREXIT(cinfo, JERR_TOO_LITTLE_DATA);
389
23
    (*cinfo->master->finish_output_pass) (cinfo);
390
23
    cinfo->global_state = DSTATE_STOPPING;
391
23
  } else if (cinfo->global_state == DSTATE_BUFIMAGE) {
392
    /* Finishing after a buffered-image operation */
393
0
    cinfo->global_state = DSTATE_STOPPING;
394
0
  } else if (cinfo->global_state != DSTATE_STOPPING) {
395
    /* STOPPING = repeat call after a suspension, anything else is error */
396
0
    ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state);
397
0
  }
398
  /* Read until EOI */
399
45
  while (!cinfo->inputctl->eoi_reached) {
400
22
    if ((*cinfo->inputctl->consume_input) (cinfo) == JPEG_SUSPENDED)
401
0
      return FALSE;             /* Suspend, come back later */
402
22
  }
403
  /* Do final cleanup */
404
23
  (*cinfo->src->term_source) (cinfo);
405
  /* We can use jpeg_abort to release memory and reset global_state */
406
23
  jpeg_abort((j_common_ptr)cinfo);
407
23
  return TRUE;
408
23
}