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
|
/* Copyright (C) 1998, 2000 Aladdin Enterprises. 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.
For more information about licensing, please refer to
http://www.ghostscript.com/licensing/. For information on
commercial licensing, go to http://www.artifex.com/licensing/ or
contact Artifex Software, Inc., 101 Lucas Valley Road #110,
San Rafael, CA 94903, U.S.A., +1(415)492-9861.
*/
/* $Id: zfrsd.c,v 1.10 2004/08/04 19:36:13 stefan Exp $ */
/* ReusableStreamDecode filter support */
#include "memory_.h"
#include "ghost.h"
#include "gsfname.h" /* for gs_parse_file_name */
#include "gxiodev.h"
#include "oper.h"
#include "stream.h"
#include "strimpl.h"
#include "sfilter.h" /* for SubFileDecode */
#include "files.h"
#include "idict.h"
#include "idparam.h"
#include "iname.h"
#include "store.h"
/* ---------------- Reusable streams ---------------- */
/*
* The actual work of constructing the filter is done in PostScript code.
* The operators in this file are internal ones that handle the dirty work.
*/
/* <dict|null> .rsdparams <filters> <decodeparms|null> */
/* filters is always an array; decodeparms is always either an array */
/* of the same length as filters, or null. */
private int
zrsdparams(i_ctx_t *i_ctx_p)
{
os_ptr op = osp;
ref *pFilter;
ref *pDecodeParms;
int Intent;
bool AsyncRead = false;
ref empty_array, filter1_array, parms1_array;
uint i;
int code = 0;
if (ref_stack_count(&o_stack) < 1)
return_error(e_stackunderflow);
if (!r_has_type(op, t_dictionary) && !r_has_type(op, t_null))
return_error(e_typecheck);
make_empty_array(&empty_array, a_readonly);
if (r_has_type(op, t_dictionary)
&& dict_find_string(op, "Filter", &pFilter) > 0) {
if (!r_is_array(pFilter)) {
if (!r_has_type(pFilter, t_name))
return_error(e_typecheck);
make_array(&filter1_array, a_readonly, 1, pFilter);
pFilter = &filter1_array;
}
} else
pFilter = &empty_array;
/* If Filter is undefined, ignore DecodeParms. */
if (pFilter != &empty_array &&
dict_find_string(op, "DecodeParms", &pDecodeParms) > 0
) {
if (pFilter == &filter1_array) {
make_array(&parms1_array, a_readonly, 1, pDecodeParms);
pDecodeParms = &parms1_array;
} else if (!r_is_array(pDecodeParms))
return_error(e_typecheck);
else if (r_size(pFilter) != r_size(pDecodeParms))
return_error(e_rangecheck);
} else
pDecodeParms = 0;
for (i = 0; i < r_size(pFilter); ++i) {
ref f, fname, dp;
array_get(imemory, pFilter, (long)i, &f);
if (!r_has_type(&f, t_name))
return_error(e_typecheck);
name_string_ref(imemory, &f, &fname);
if (r_size(&fname) < 6 ||
memcmp(fname.value.bytes + r_size(&fname) - 6, "Decode", 6)
)
return_error(e_rangecheck);
if (pDecodeParms) {
array_get(imemory, pDecodeParms, (long)i, &dp);
if (!(r_has_type(&dp, t_dictionary) || r_has_type(&dp, t_null)))
return_error(e_typecheck);
}
}
if (r_has_type(op, t_dictionary))
code = dict_int_param(op, "Intent", 0, 3, 0, &Intent);
if (r_has_type(op, t_dictionary))
if ((code = dict_bool_param(op, "AsyncRead", false, &AsyncRead)) < 0)
return code;
push(1);
op[-1] = *pFilter;
if (pDecodeParms)
*op = *pDecodeParms;
else
make_null(op);
return 0;
}
/* <file|string> <CloseSource> .reusablestream <filter> */
/*
* The file|string operand must be a "reusable source", either:
* - A string or bytestring;
* - A readable, positionable file stream;
* - A readable string stream;
* - A SubFileDecode filter with an empty EODString and a reusable
* source.
* Reusable streams are also reusable sources, but they look just like
* ordinary file or string streams.
*/
private int make_rss(i_ctx_t *i_ctx_p, os_ptr op, const byte * data,
uint size, int space, long offset, long length,
bool is_bytestring);
private int make_rfs(i_ctx_t *i_ctx_p, os_ptr op, stream *fs,
long offset, long length);
private int
zreusablestream(i_ctx_t *i_ctx_p)
{
os_ptr op = osp;
os_ptr source_op = op - 1;
long length = max_long;
bool close_source;
int code;
check_type(*op, t_boolean);
close_source = op->value.boolval;
if (r_has_type(source_op, t_string)) {
uint size = r_size(source_op);
check_read(*source_op);
code = make_rss(i_ctx_p, source_op, source_op->value.const_bytes,
size, r_space(source_op), 0L, size, false);
} else if (r_has_type(source_op, t_astruct)) {
uint size = gs_object_size(imemory, source_op->value.pstruct);
if (gs_object_type(imemory, source_op->value.pstruct) != &st_bytes)
return_error(e_rangecheck);
check_read(*source_op);
code = make_rss(i_ctx_p, source_op,
(const byte *)source_op->value.pstruct, size,
r_space(source_op), 0L, size, true);
} else {
long offset = 0;
stream *source;
stream *s;
check_read_file(source, source_op);
s = source;
rs:
if (s->cbuf_string.data != 0) { /* string stream */
long pos = stell(s);
long avail = sbufavailable(s) + pos;
offset += pos;
code = make_rss(i_ctx_p, source_op, s->cbuf_string.data,
s->cbuf_string.size,
imemory_space((const gs_ref_memory_t *)s->memory),
offset, min(avail, length), false);
} else if (s->file != 0) { /* file stream */
if (~s->modes & (s_mode_read | s_mode_seek))
return_error(e_ioerror);
code = make_rfs(i_ctx_p, source_op, s, offset + stell(s), length);
} else if (s->state->template == &s_SFD_template) {
/* SubFileDecode filter */
const stream_SFD_state *const sfd_state =
(const stream_SFD_state *)s->state;
if (sfd_state->eod.size != 0)
return_error(e_rangecheck);
offset += sfd_state->skip_count - sbufavailable(s);
if (sfd_state->count != 0) {
long left = max(sfd_state->count, 0) + sbufavailable(s);
if (left < length)
length = left;
}
s = s->strm;
goto rs;
}
else /* some other kind of stream */
return_error(e_rangecheck);
if (close_source) {
stream *rs = fptr(source_op);
rs->strm = source; /* only for close_source */
rs->close_strm = true;
}
}
if (code >= 0)
pop(1);
return code;
}
/* Make a reusable string stream. */
private int
make_rss(i_ctx_t *i_ctx_p, os_ptr op, const byte * data, uint size,
int string_space, long offset, long length, bool is_bytestring)
{
stream *s;
long left = min(length, size - offset);
if (icurrent_space < string_space)
return_error(e_invalidaccess);
s = file_alloc_stream(imemory, "make_rss");
if (s == 0)
return_error(e_VMerror);
sread_string_reusable(s, data + offset, max(left, 0));
if (is_bytestring)
s->cbuf_string.data = 0; /* byte array, not string */
make_stream_file(op, s, "r");
return 0;
}
/* Make a reusable file stream. */
private int
make_rfs(i_ctx_t *i_ctx_p, os_ptr op, stream *fs, long offset, long length)
{
gs_const_string fname;
gs_parsed_file_name_t pname;
stream *s;
int code;
if (sfilename(fs, &fname) < 0)
return_error(e_ioerror);
code = gs_parse_file_name(&pname, (const char *)fname.data, fname.size);
if (code < 0)
return code;
if (pname.len == 0) /* %stdin% etc. won't have a filename */
return_error(e_invalidfileaccess); /* can't reopen */
if (pname.iodev == NULL)
pname.iodev = iodev_default;
/* Open the file again, to be independent of the source. */
code = file_open_stream((const char *)pname.fname, pname.len, "r",
fs->cbsize, &s, pname.iodev,
pname.iodev->procs.fopen, imemory);
if (code < 0)
return code;
if (sread_subfile(s, offset, length) < 0) {
sclose(s);
return_error(e_ioerror);
}
s->close_at_eod = false;
make_stream_file(op, s, "r");
return 0;
}
/* ---------------- Initialization procedure ---------------- */
const op_def zfrsd_op_defs[] =
{
{"2.reusablestream", zreusablestream},
{"2.rsdparams", zrsdparams},
op_def_end(0)
};
|
