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
|
/* Copyright (C) 2001-2025 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., 39 Mesa Street, Suite 108A, San Francisco,
CA 94129, USA, for further information.
*/
/* DCTDecode filter creation */
#include "memory_.h"
#include "stdio_.h" /* for jpeglib.h */
#include "jpeglib_.h"
#include "ghost.h"
#include "oper.h"
#include "gsmemory.h"
#include "strimpl.h"
#include "sdct.h"
#include "sjpeg.h"
#include "ialloc.h"
#include "ifilter.h"
#include "iparam.h"
#include "igstate.h" /* For igs macro */
#include "gxdevcli.h" /* for dev_spec_op */
#include "gxdevsop.h" /* For spec_op enumerated types */
private_st_jpeg_decompress_data();
/* Import the parameter processing procedure from sddparam.c */
stream_state_proc_put_params(s_DCTD_put_params, stream_DCT_state);
/* Find the memory that will be used for allocating the stream. */
static gs_ref_memory_t *
find_stream_memory(i_ctx_t *i_ctx_p, int npop, uint *space)
{
uint use_space = max(*space, avm_global);
os_ptr sop = osp - npop;
if (r_has_type(sop, t_dictionary)) {
--sop;
}
*space = max(use_space, r_space(sop));
return idmemory->spaces_indexed[*space >> r_space_shift];
}
static int PS_DCTD_PassThrough(void *d, byte *Buffer, int Size)
{
gx_device *dev = (gx_device *)d;
int code = 0;
if (Buffer == NULL) {
if (Size == 0)
code = dev_proc(dev, dev_spec_op)(dev, gxdso_JPEG_passthrough_end, NULL, 0);
else
code = dev_proc(dev, dev_spec_op)(dev, gxdso_JPEG_passthrough_begin, NULL, 0);
} else {
code = dev_proc(dev, dev_spec_op)(dev, gxdso_JPEG_passthrough_data, Buffer, Size);
}
return code;;
}
/* <source> <dict> DCTDecode/filter <file> */
/* <source> DCTDecode/filter <file> */
static int
zDCTD(i_ctx_t *i_ctx_p)
{
os_ptr op = osp;
gs_memory_t *mem;
stream_DCT_state state;
dict_param_list list;
jpeg_decompress_data *jddp;
int code;
const ref *dop;
uint dspace;
gx_device *dev = gs_currentdevice(igs);
check_op(1);
if (r_has_type(op, t_dictionary)) {
dop = op, dspace = r_space(op);
check_op(2);
}
else
dop = 0, dspace = 0;
mem = (gs_memory_t *)find_stream_memory(i_ctx_p, 0, &dspace);
state.memory = mem;
/* First allocate space for IJG parameters. */
jddp = gs_alloc_struct_immovable(mem,jpeg_decompress_data,
&st_jpeg_decompress_data, "zDCTD");
if (jddp == 0)
return_error(gs_error_VMerror);
if (s_DCTD_template.set_defaults)
(*s_DCTD_template.set_defaults) ((stream_state *) & state);
state.data.decompress = jddp;
jddp->memory = state.jpeg_memory = mem; /* set now for allocation */
jddp->scanline_buffer = NULL; /* set this early for safe error exit */
state.report_error = filter_report_error; /* in case create fails */
if ((code = gs_jpeg_create_decompress(&state)) < 0)
goto fail; /* correct to do jpeg_destroy here */
/* Read parameters from dictionary */
if ((code = dict_param_list_read(&list, dop, NULL, false, iimemory)) < 0)
goto fail;
if ((code = s_DCTD_put_params((gs_param_list *) & list, &state)) < 0)
goto rel;
if (dev_proc(dev, dev_spec_op)(dev, gxdso_JPEG_passthrough_query, NULL, 0) > 0) {
jddp->StartedPassThrough = 0;
jddp->PassThrough = 1;
jddp->PassThroughfn = (PS_DCTD_PassThrough);
jddp->device = (void *)dev;
}
else {
jddp->PassThrough = 0;
jddp->device = (void *)NULL;
}
/* Create the filter. */
jddp->templat = s_DCTD_template;
code = filter_read(i_ctx_p, 0, &jddp->templat,
(stream_state *) & state, dspace);
if (code >= 0) /* Success! */
return code;
/*
* We assume that if filter_read fails, the stream has not been
* registered for closing, so s_DCTD_release will never be called.
* Therefore we free the allocated memory before failing.
*/
rel:
iparam_list_release(&list);
fail:
gs_jpeg_destroy(&state);
gs_free_object(mem, jddp, "zDCTD fail");
return code;
}
/* ------ Initialization procedure ------ */
const op_def zfdctd_op_defs[] =
{
op_def_begin_filter(),
{"2DCTDecode", zDCTD},
op_def_end(0)
};
|
