1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
|
/* Copyright (C) 2001-2021 Artifex Software, Inc.
All Rights Reserved.
This software is provided AS-IS with no warranty, either express or
implied.
This software is distributed under license and may not be copied,
modified or distributed except as expressly authorized under the terms
of the license contained in the file LICENSE in this distribution.
Refer to licensing information at http://www.artifex.com or contact
Artifex Software, Inc., 1305 Grant Avenue - Suite 200, Novato,
CA 94945, U.S.A., +1(415)492-9861, for further information.
*/
/* opj filter implementation using OpenJPeg library */
#include "memory_.h"
#include "gserrors.h"
#include "gdebug.h"
#include "strimpl.h"
#include "sjpx_openjpeg.h"
#include "gxsync.h"
#include "assert_.h"
#if !defined(SHARE_JPX) || (SHARE_JPX == 0)
#include "opj_malloc.h"
#endif
/* Some locking to get around the criminal lack of context
* in the openjpeg library. */
#if !defined(SHARE_JPX) || (SHARE_JPX == 0)
static gs_memory_t *opj_memory;
#endif
int sjpxd_create(gs_memory_t *mem)
{
#if !defined(SHARE_JPX) || (SHARE_JPX == 0)
gs_lib_ctx_t *ctx = mem->gs_lib_ctx;
ctx->sjpxd_private = gx_monitor_label(gx_monitor_alloc(mem), "sjpxd_monitor");
if (ctx->sjpxd_private == NULL)
return gs_error_VMerror;
#endif
return 0;
}
void sjpxd_destroy(gs_memory_t *mem)
{
#if !defined(SHARE_JPX) || (SHARE_JPX == 0)
gs_lib_ctx_t *ctx = mem->gs_lib_ctx;
gx_monitor_free((gx_monitor_t *)ctx->sjpxd_private);
ctx->sjpxd_private = NULL;
#endif
}
static int opj_lock(gs_memory_t *mem)
{
#if !defined(SHARE_JPX) || (SHARE_JPX == 0)
int ret;
gs_lib_ctx_t *ctx = mem->gs_lib_ctx;
ret = gx_monitor_enter((gx_monitor_t *)ctx->sjpxd_private);
assert(opj_memory == NULL);
opj_memory = mem->non_gc_memory;
return ret;
#else
return 0;
#endif
}
static int opj_unlock(gs_memory_t *mem)
{
#if !defined(SHARE_JPX) || (SHARE_JPX == 0)
gs_lib_ctx_t *ctx = mem->gs_lib_ctx;
assert(opj_memory != NULL);
opj_memory = NULL;
return gx_monitor_leave((gx_monitor_t *)ctx->sjpxd_private);
#else
return 0;
#endif
}
#if !defined(SHARE_JPX) || (SHARE_JPX == 0)
/* Allocation routines that use the memory pointer given above */
void *opj_malloc(size_t size)
{
if (size == 0)
return NULL;
assert(opj_memory != NULL);
if (size > (size_t) ARCH_MAX_UINT)
return NULL;
return (void *)gs_alloc_bytes(opj_memory, size, "opj_malloc");
}
void *opj_calloc(size_t n, size_t size)
{
void *ptr;
/* FIXME: Check for overflow? */
size *= n;
ptr = opj_malloc(size);
if (ptr)
memset(ptr, 0, size);
return ptr;
}
void *opj_realloc(void *ptr, size_t size)
{
if (ptr == NULL)
return opj_malloc(size);
if (size == 0)
{
opj_free(ptr);
return NULL;
}
return gs_resize_object(opj_memory, ptr, size, "opj_malloc");
}
void opj_free(void *ptr)
{
gs_free_object(opj_memory, ptr, "opj_malloc");
}
static inline void * opj_aligned_malloc_n(size_t size, size_t align)
{
uint8_t *ptr;
int off;
if (size == 0)
return NULL;
size += align + sizeof(uint8_t);
ptr = opj_malloc(size);
if (ptr == NULL)
return NULL;
off = align - (((int)(intptr_t)ptr) & (align - 1));
ptr[off-1] = off;
return ptr + off;
}
void * opj_aligned_malloc(size_t size)
{
return opj_aligned_malloc_n(size, 16);
}
void *opj_aligned_32_malloc(size_t size)
{
return opj_aligned_malloc_n(size, 32);
}
void opj_aligned_free(void* ptr_)
{
uint8_t *ptr = (uint8_t *)ptr_;
uint8_t off;
if (ptr == NULL)
return;
off = ptr[-1];
opj_free((void *)(((unsigned char *)ptr) - off));
}
#if 0
/* UNUSED currently, and moderately tricky, so deferred until required */
void * opj_aligned_realloc(void *ptr, size_t size)
{
return opj_realloc(ptr, size);
}
#endif
#endif
gs_private_st_simple(st_jpxd_state, stream_jpxd_state,
"JPXDecode filter state"); /* creates a gc object for our state,
defined in sjpx.h */
static int s_opjd_accumulate_input(stream_jpxd_state *state, stream_cursor_read * pr);
static OPJ_SIZE_T sjpx_stream_read(void * p_buffer, OPJ_SIZE_T p_nb_bytes, void * p_user_data)
{
stream_block *sb = (stream_block *)p_user_data;
OPJ_SIZE_T len;
len = sb->fill - sb->pos;
if (sb->fill < sb->pos)
len = 0;
if (len == 0)
return (OPJ_SIZE_T)-1; /* End of file! */
if ((OPJ_SIZE_T)len > p_nb_bytes)
len = p_nb_bytes;
memcpy(p_buffer, sb->data + sb->pos, len);
sb->pos += len;
return len;
}
static OPJ_OFF_T sjpx_stream_skip(OPJ_OFF_T skip, void * p_user_data)
{
stream_block *sb = (stream_block *)p_user_data;
if (skip > sb->fill - sb->pos)
skip = sb->fill - sb->pos;
sb->pos += skip;
return sb->pos;
}
static OPJ_BOOL sjpx_stream_seek(OPJ_OFF_T seek_pos, void * p_user_data)
{
stream_block *sb = (stream_block *)p_user_data;
if (seek_pos > sb->fill)
return OPJ_FALSE;
sb->pos = seek_pos;
return OPJ_TRUE;
}
static void sjpx_error_callback(const char *msg, void *ptr)
{
dlprintf1("openjpeg error: %s", msg);
}
static void sjpx_info_callback(const char *msg, void *ptr)
{
#ifdef DEBUG
/* prevent too many messages during normal build */
dlprintf1("openjpeg info: %s", msg);
#endif
}
static void sjpx_warning_callback(const char *msg, void *ptr)
{
#ifdef DEBUG
/* prevent too many messages during normal build */
dlprintf1("openjpeg warning: %s", msg);
#endif
}
/* initialize the stream */
static int
s_opjd_init(stream_state * ss)
{
stream_jpxd_state *const state = (stream_jpxd_state *) ss;
state->codec = NULL;
state->image = NULL;
state->sb.data= NULL;
state->sb.size = 0;
state->sb.pos = 0;
state->sb.fill = 0;
state->out_offset = 0;
state->pdata = NULL;
state->sign_comps = NULL;
state->stream = NULL;
state->row_data = NULL;
return 0;
}
/* setting the codec format,
allocating the stream and image structures, and
initializing the decoder.
*/
static int
s_opjd_set_codec_format(stream_state * ss, OPJ_CODEC_FORMAT format)
{
stream_jpxd_state *const state = (stream_jpxd_state *) ss;
opj_dparameters_t parameters; /* decompression parameters */
/* set decoding parameters to default values */
opj_set_default_decoder_parameters(¶meters);
/* get a decoder handle */
state->codec = opj_create_decompress(format);
if (state->codec == NULL)
return_error(gs_error_VMerror);
/* catch events using our callbacks */
opj_set_error_handler(state->codec, sjpx_error_callback, stderr);
opj_set_info_handler(state->codec, sjpx_info_callback, stderr);
opj_set_warning_handler(state->codec, sjpx_warning_callback, stderr);
if (state->colorspace == gs_jpx_cs_indexed) {
parameters.flags |= OPJ_DPARAMETERS_IGNORE_PCLR_CMAP_CDEF_FLAG;
}
/* setup the decoder decoding parameters using user parameters */
if (!opj_setup_decoder(state->codec, ¶meters))
{
dlprintf("openjpeg: failed to setup the decoder!\n");
return ERRC;
}
/* open a byte stream */
state->stream = opj_stream_default_create(OPJ_TRUE);
if (state->stream == NULL)
{
dlprintf("openjpeg: failed to open a byte stream!\n");
return ERRC;
}
opj_stream_set_read_function(state->stream, sjpx_stream_read);
opj_stream_set_skip_function(state->stream, sjpx_stream_skip);
opj_stream_set_seek_function(state->stream, sjpx_stream_seek);
return 0;
}
static void
ycc_to_rgb_8(unsigned char *row, unsigned long row_size)
{
unsigned char y;
signed char u, v;
int r,g,b;
do
{
y = row[0];
u = row[1] - 128;
v = row[2] - 128;
r = (int)((double)y + 1.402 * v);
if (r < 0)
r = 0;
if (r > 255)
r = 255;
g = (int)((double)y - 0.34413 * u - 0.71414 * v);
if (g < 0)
g = 0;
if (g > 255)
g = 255;
b = (int)((double)y + 1.772 * u);
if (b < 0)
b = 0;
if (b > 255)
b = 255;
row[0] = r;
row[1] = g;
row[2] = b;
row += 3;
row_size -= 3;
}
while (row_size);
}
static void
ycc_to_rgb_16(unsigned char *row, unsigned long row_size)
{
unsigned short y;
signed short u, v;
int r,g,b;
do
{
y = (row[0]<<8) | row[1];
u = ((row[2]<<8) | row[3]) - 32768;
v = ((row[4]<<8) | row[5]) - 32768;
r = (int)((double)y + 1.402 * v);
if (r < 0)
r = 0;
if (r > 65535)
r = 65535;
g = (int)((double)y - 0.34413 * u - 0.71414 * v);
if (g < 0)
g = 0;
if (g > 65535)
g = 65535;
b = (int)((double)y + 1.772 * u);
if (b < 0)
b = 0;
if (b > 65535)
b = 65535;
row[0] = r>>8;
row[1] = r;
row[2] = g>>8;
row[3] = g;
row[4] = b>>8;
row[5] = b;
row += 6;
row_size -= 6;
}
while (row_size);
}
static int decode_image(stream_jpxd_state * const state)
{
int numprimcomp = 0, alpha_comp = -1, compno, rowbytes;
/* read header */
if (!opj_read_header(state->stream, state->codec, &(state->image)))
{
dlprintf("openjpeg: failed to read header\n");
return ERRC;
}
/* decode the stream and fill the image structure */
if (!opj_decode(state->codec, state->stream, state->image))
{
dlprintf("openjpeg: failed to decode image!\n");
return ERRC;
}
/* check dimension and prec */
if (state->image->numcomps == 0)
return ERRC;
state->width = state->image->comps[0].w;
state->height = state->image->comps[0].h;
state->bpp = state->image->comps[0].prec;
state->samescale = true;
for(compno = 1; compno < state->image->numcomps; compno++)
{
if (state->bpp != state->image->comps[compno].prec)
return ERRC; /* Not supported. */
if (state->width < state->image->comps[compno].w)
state->width = state->image->comps[compno].w;
if (state->height < state->image->comps[compno].h)
state->height = state->image->comps[compno].h;
if (state->image->comps[compno].dx != state->image->comps[0].dx ||
state->image->comps[compno].dy != state->image->comps[0].dy)
state->samescale = false;
}
/* find alpha component and regular colour component by channel definition */
for (compno = 0; compno < state->image->numcomps; compno++)
{
if (state->image->comps[compno].alpha == 0x00)
numprimcomp++;
else if (state->image->comps[compno].alpha == 0x01 || state->image->comps[compno].alpha == 0x02)
alpha_comp = compno;
}
/* color space and number of components */
switch(state->image->color_space)
{
case OPJ_CLRSPC_GRAY:
state->colorspace = gs_jpx_cs_gray;
if (numprimcomp > 1) {
dmprintf1(state->memory, "openjpeg warning: Ignoring extra components for %d component Gray data.\n", numprimcomp);
numprimcomp = 1;
}
break;
case OPJ_CLRSPC_SRGB:
case OPJ_CLRSPC_SYCC:
case OPJ_CLRSPC_EYCC:
state->colorspace = gs_jpx_cs_rgb;
if (numprimcomp > 3) {
dmprintf1(state->memory, "openjpeg warning: Ignoring extra components for %d component RGB data.\n", numprimcomp);
numprimcomp = 3;
}
break;
case OPJ_CLRSPC_CMYK:
state->colorspace = gs_jpx_cs_cmyk;
if (numprimcomp > 4) {
dmprintf1(state->memory, "openjpeg warning: Ignoring extra components for %d component CMYK data.\n", numprimcomp);
numprimcomp = 4;
}
break;
default:
case OPJ_CLRSPC_UNSPECIFIED:
case OPJ_CLRSPC_UNKNOWN:
if (numprimcomp == 1) {
dmprintf1(state->memory, "openjpeg warning: unspec CS. %d component so assuming gray.\n", numprimcomp);
state->colorspace = gs_jpx_cs_gray;
} else if (numprimcomp == 4) {
dmprintf1(state->memory, "openjpeg warning: unspec CS. %d components so assuming CMYK.\n", numprimcomp);
state->colorspace = gs_jpx_cs_cmyk;
} else {
/* Note, numprimcomp > 4 possible here. Bug 694909.
Trust that it is RGB though. Do not set numprimcomp */
dmprintf1(state->memory, "openjpeg warning: unspec CS. %d components. Assuming data RGB.\n", numprimcomp);
state->colorspace = gs_jpx_cs_rgb;
}
break;
}
state->alpha_comp = -1;
if (state->alpha)
{
state->alpha_comp = alpha_comp;
state->out_numcomps = 1;
}
else
state->out_numcomps = numprimcomp;
/* round up bpp 12->16 */
if (state->bpp == 12)
state->bpp = 16;
/* calculate total data */
rowbytes = (state->width*state->bpp*state->out_numcomps+7)/8;
state->totalbytes = (ulong)rowbytes*state->height;
state->pdata = (int **)gs_alloc_byte_array(state->memory->non_gc_memory, sizeof(int*)*state->image->numcomps, 1, "decode_image(pdata)");
if (!state->pdata)
return_error(gs_error_VMerror);
/* compensate for signed data (signed => unsigned) */
state->sign_comps = (int *)gs_alloc_byte_array(state->memory->non_gc_memory, sizeof(int)*state->image->numcomps, 1, "decode_image(sign_comps)");
if (!state->sign_comps)
return_error(gs_error_VMerror);
for(compno = 0; compno < state->image->numcomps; compno++)
{
if (state->image->comps[compno].sgnd)
state->sign_comps[compno] = ((state->bpp%8)==0) ? 0x80 : (1<<(state->bpp-1));
else
state->sign_comps[compno] = 0;
}
return 0;
}
static int process_one_trunk(stream_jpxd_state * const state, stream_cursor_write * pw)
{
/* read data from image to pw */
unsigned long out_size = pw->limit - pw->ptr;
int bytepp1 = state->bpp/8; /* bytes / pixel for one output component */
int bytepp = state->out_numcomps*state->bpp/8; /* bytes / pixel all components */
unsigned long write_size = min(out_size-(bytepp?(out_size%bytepp):0), state->totalbytes-state->out_offset);
int shift_bit = state->bpp-state->image->comps[0].prec; /*difference between input and output bit-depth*/
int img_numcomps = min(state->out_numcomps, state->image->numcomps); /* the actual number of channel data used */
int compno;
unsigned long il;
int i;
int b;
byte *row;
unsigned int x_offset;
unsigned int y_offset;
unsigned int row_size = (state->width * state->out_numcomps * state->bpp + 7)>>3;
/* If nothing to write, nothing to do */
if (write_size == 0)
return 0;
if (state->row_data == NULL)
{
state->row_data = gs_alloc_byte_array(state->memory->non_gc_memory, row_size, 1, "jpxd_openjpeg(row_data)");
if (state->row_data == NULL)
return gs_error_VMerror;
}
while (state->out_offset != state->totalbytes)
{
y_offset = state->out_offset / row_size;
x_offset = state->out_offset % row_size;
if (x_offset == 0)
{
/* Decode another rows worth */
row = state->row_data;
if (state->alpha && state->alpha_comp == -1)
{
/* return 0xff for all */
memset(row, 0xff, row_size);
}
else if (state->samescale)
{
if (state->alpha)
state->pdata[0] = &(state->image->comps[state->alpha_comp].data[y_offset * state->width]);
else
{
for (compno=0; compno<img_numcomps; compno++)
state->pdata[compno] = &(state->image->comps[compno].data[y_offset * state->width]);
}
if (shift_bit == 0 && state->bpp == 8) /* optimized for the most common case */
{
for (i = state->width; i > 0; i--)
for (compno=0; compno<img_numcomps; compno++)
*row++ = *(state->pdata[compno]++) + state->sign_comps[compno]; /* copy input buffer to output */
}
else if ((state->bpp%8)==0)
{
for (i = state->width; i > 0; i--)
{
for (compno=0; compno<img_numcomps; compno++)
{
for (b=0; b<bytepp1; b++)
*row++ = (((*(state->pdata[compno]) << shift_bit) >> (8*(bytepp1-b-1))))
+ (b==0 ? state->sign_comps[compno] : 0); /* split and shift input int to output bytes */
state->pdata[compno]++;
}
}
}
else
{
/* shift_bit = 0, bpp < 8 */
int bt=0;
int bit_pos = 0;
for (i = state->width; i > 0; i--)
{
for (compno=0; compno<img_numcomps; compno++)
{
bt <<= state->bpp;
bt += *(state->pdata[compno]++) + state->sign_comps[compno];
bit_pos += state->bpp;
if (bit_pos >= 8)
{
*row++ = bt >> (bit_pos-8);
bit_pos -= 8;
bt &= (1<<bit_pos)-1;
}
}
}
if (bit_pos != 0)
{
/* row padding */
*row++ = bt << (8 - bit_pos);
bit_pos = 0;
bt = 0;
}
}
}
else if ((state->bpp%8)==0)
{
/* sampling required */
if (state->alpha)
{
for (i = 0; i < state->width; i++)
{
int in_offset_scaled = (y_offset/state->image->comps[state->alpha_comp].dy*state->width + i)/state->image->comps[state->alpha_comp].dx;
for (b=0; b<bytepp1; b++)
*row++ = (((state->image->comps[state->alpha_comp].data[in_offset_scaled] << shift_bit) >> (8*(bytepp1-b-1))))
+ (b==0 ? state->sign_comps[state->alpha_comp] : 0);
}
}
else
{
for (i = 0; i < state->width; i++)
{
for (compno=0; compno<img_numcomps; compno++)
{
int in_offset_scaled = (y_offset/state->image->comps[compno].dy*state->width + i)/state->image->comps[compno].dx;
for (b=0; b<bytepp1; b++)
*row++ = (((state->image->comps[compno].data[in_offset_scaled] << shift_bit) >> (8*(bytepp1-b-1))))
+ (b==0 ? state->sign_comps[compno] : 0);
}
}
}
}
else
{
int compno = state->alpha ? state->alpha_comp : 0;
int bt=0;
int ppbyte1 = 8/state->bpp;
/* sampling required */
/* only grayscale can have such bit-depth, also shift_bit = 0, bpp < 8 */
for (i = 0; i < state->width; i++)
{
for (b=0; b<ppbyte1; b++)
{
int in_offset_scaled = (y_offset/state->image->comps[compno].dy*state->width + i)/state->image->comps[compno].dx;
bt = bt<<state->bpp;
bt += state->image->comps[compno].data[in_offset_scaled] + state->sign_comps[compno];
}
*row++ = bt;
}
}
if (state->image->color_space == OPJ_CLRSPC_SYCC || state->image->color_space == OPJ_CLRSPC_EYCC)
{
/* bpp >= 8 always, as bpp < 8 only for grayscale */
if (state->bpp == 8)
ycc_to_rgb_8(state->row_data, row_size);
else
ycc_to_rgb_16(state->row_data, row_size);
}
}
pw->ptr++;
il = (write_size > (unsigned long)(row_size - x_offset)) ? (row_size - x_offset) : (unsigned int)write_size;
memcpy(pw->ptr, &state->row_data[x_offset], il);
pw->ptr += il;
pw->ptr--;
state->out_offset += il;
write_size -= il;
if (write_size == 0)
break;
}
if (state->out_offset == state->totalbytes)
return EOFC; /* all data returned */
else
return 1; /* need more calls */
}
/* process a section of the input and return any decoded data.
see strimpl.h for return codes.
*/
static int
s_opjd_process(stream_state * ss, stream_cursor_read * pr,
stream_cursor_write * pw, bool last)
{
stream_jpxd_state *const state = (stream_jpxd_state *) ss;
long in_size = pr->limit - pr->ptr;
int locked = 0;
int code;
if (in_size > 0)
{
if (state->PassThrough && state->PassThroughfn) {
if (state->PassThrough && state->PassThroughfn && !state->StartedPassThrough) {
state->StartedPassThrough = 1;
(state->PassThroughfn)(state->device, NULL, 1);
}
(state->PassThroughfn)(state->device, (byte *)pr->ptr + 1, (byte *)pr->limit - (byte *)pr->ptr);
}
/* buffer available data */
code = opj_lock(ss->memory);
if (code < 0) return code;
locked = 1;
code = s_opjd_accumulate_input(state, pr);
if (code < 0) return code;
if (state->codec == NULL) {
/* state->sb.size is non-zero after successful
accumulate_input(); 1 is probably extremely rare */
if (state->sb.data[0] == 0xFF && ((state->sb.size == 1) || (state->sb.data[1] == 0x4F)))
code = s_opjd_set_codec_format(ss, OPJ_CODEC_J2K);
else
code = s_opjd_set_codec_format(ss, OPJ_CODEC_JP2);
if (code < 0)
{
(void)opj_unlock(ss->memory);
return code;
}
}
}
if (last == 1)
{
if (state->image == NULL)
{
int ret;
if (locked == 0)
{
ret = opj_lock(ss->memory);
if (ret < 0) return ret;
locked = 1;
}
#if OPJ_VERSION_MAJOR >= 2 && OPJ_VERSION_MINOR >= 1
opj_stream_set_user_data(state->stream, &(state->sb), NULL);
#else
opj_stream_set_user_data(state->stream, &(state->sb));
#endif
opj_stream_set_user_data_length(state->stream, state->sb.size);
ret = decode_image(state);
if (ret != 0)
{
(void)opj_unlock(ss->memory);
return ret;
}
}
if (locked)
{
code = opj_unlock(ss->memory);
if (code < 0) return code;
}
/* copy out available data */
return process_one_trunk(state, pw);
}
if (locked)
return opj_unlock(ss->memory);
/* ask for more data */
return 0;
}
/* Set the defaults */
static void
s_opjd_set_defaults(stream_state * ss) {
stream_jpxd_state *const state = (stream_jpxd_state *) ss;
state->alpha = false;
state->colorspace = gs_jpx_cs_rgb;
state->StartedPassThrough = 0;
state->PassThrough = 0;
state->PassThroughfn = NULL;
state->device = (void *)NULL;
}
/* stream release.
free all our decoder state.
*/
static void
s_opjd_release(stream_state *ss)
{
stream_jpxd_state *const state = (stream_jpxd_state *) ss;
if (state->PassThrough && state->PassThroughfn && state->StartedPassThrough) {
state->StartedPassThrough = 0;
(state->PassThroughfn)(state->device, NULL, 0);
}
/* empty stream or failed to accumulate */
if (state->codec == NULL)
return;
(void)opj_lock(ss->memory);
/* free image data structure */
if (state->image)
opj_image_destroy(state->image);
/* free stream */
if (state->stream)
opj_stream_destroy(state->stream);
/* free decoder handle */
if (state->codec)
opj_destroy_codec(state->codec);
(void)opj_unlock(ss->memory);
/* free input buffer */
if (state->sb.data)
gs_free_object(state->memory->non_gc_memory, state->sb.data, "s_opjd_release(sb.data)");
if (state->pdata)
gs_free_object(state->memory->non_gc_memory, state->pdata, "s_opjd_release(pdata)");
if (state->sign_comps)
gs_free_object(state->memory->non_gc_memory, state->sign_comps, "s_opjd_release(sign_comps)");
if (state->row_data)
gs_free_object(state->memory->non_gc_memory, state->row_data, "s_opjd_release(row_data)");
}
static int
s_opjd_accumulate_input(stream_jpxd_state *state, stream_cursor_read * pr)
{
long in_size = pr->limit - pr->ptr;
/* grow the input buffer if needed */
if (state->sb.size < state->sb.fill + in_size)
{
unsigned char *new_buf;
unsigned long new_size = state->sb.size==0 ? in_size : state->sb.size;
while (new_size < state->sb.fill + in_size)
new_size = new_size << 1;
if_debug1('s', "[s]opj growing input buffer to %lu bytes\n",
new_size);
if (state->sb.data == NULL)
new_buf = (byte *) gs_alloc_byte_array(state->memory->non_gc_memory, new_size, 1, "s_opjd_accumulate_input(alloc)");
else
new_buf = (byte *) gs_resize_object(state->memory->non_gc_memory, state->sb.data, new_size, "s_opjd_accumulate_input(resize)");
if (new_buf == NULL) return_error( gs_error_VMerror);
state->sb.data = new_buf;
state->sb.size = new_size;
}
/* copy the available input into our buffer */
/* note that the gs stream library uses offset-by-one
indexing of its buffers while we use zero indexing */
memcpy(state->sb.data + state->sb.fill, pr->ptr + 1, in_size);
state->sb.fill += in_size;
pr->ptr += in_size;
return 0;
}
/* stream template */
const stream_template s_jpxd_template = {
&st_jpxd_state,
s_opjd_init,
s_opjd_process,
1024, 1024, /* min in and out buffer sizes we can handle
should be ~32k,64k for efficiency? */
s_opjd_release,
s_opjd_set_defaults
};
|