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
|
/* Copyright (C) 1994, 1997 Aladdin Enterprises. All rights reserved.
This file is part of GNU Ghostscript.
GNU Ghostscript is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY. No author or distributor accepts responsibility to
anyone for the consequences of using it or for whether it serves any
particular purpose or works at all, unless he says so in writing. Refer to
the GNU General Public License for full details.
Everyone is granted permission to copy, modify and redistribute GNU
Ghostscript, but only under the conditions described in the GNU General
Public License. A copy of this license is supposed to have been given to
you along with GNU Ghostscript so you can know your rights and
responsibilities. It should be in a file named COPYING. Among other
things, the copyright notice and this notice must be preserved on all
copies.
Aladdin Enterprises is not affiliated with the Free Software Foundation or
the GNU Project. GNU Ghostscript, as distributed by Aladdin Enterprises,
does not depend on any other GNU software.
*/
/* zmisc1.c */
/* Miscellaneous Type 1 font operators */
#include "memory_.h"
#include "ghost.h"
#include "errors.h"
#include "oper.h"
#include "gscrypt1.h"
#include "stream.h" /* for getting state of PFBD stream */
#include "strimpl.h"
#include "sfilter.h"
#include "idict.h"
#include "idparam.h"
#include "ifilter.h"
/* <state> <from_string> <to_string> .type1encrypt <new_state> <substring> */
/* <state> <from_string> <to_string> .type1decrypt <new_state> <substring> */
private int type1crypt(P2(os_ptr,
int (*)(P4(byte *, const byte *, uint, ushort *))));
private int
ztype1encrypt(os_ptr op)
{ return type1crypt(op, gs_type1_encrypt);
}
private int
ztype1decrypt(os_ptr op)
{ return type1crypt(op, gs_type1_decrypt);
}
private int
type1crypt(register os_ptr op, int (*proc)(P4(byte *, const byte *, uint, ushort *)))
{ crypt_state state;
uint ssize;
check_type(op[-2], t_integer);
state = op[-2].value.intval;
if ( op[-2].value.intval != state )
return_error(e_rangecheck); /* state value was truncated */
check_read_type(op[-1], t_string);
check_write_type(*op, t_string);
ssize = r_size(op - 1);
if ( r_size(op) < ssize )
return_error(e_rangecheck);
discard((*proc)(op->value.bytes, op[-1].value.const_bytes, ssize,
&state)); /* can't fail */
op[-2].value.intval = state;
op[-1] = *op;
r_set_size(op - 1, ssize);
pop(1);
return 0;
}
/* Get the seed parameter for eexecEncode/Decode. */
/* Return npop if OK. */
private int
eexec_param(os_ptr op, ushort *pcstate)
{ int npop = 1;
if ( r_has_type(op, t_dictionary) )
++npop, --op;
check_type(*op, t_integer);
*pcstate = op->value.intval;
if ( op->value.intval != *pcstate )
return_error(e_rangecheck); /* state value was truncated */
return npop;
}
/* <target> <seed> eexecEncode/filter <file> */
/* <target> <seed> <dict_ignored> eexecEncode/filter <file> */
private int
zexE(register os_ptr op)
{ stream_exE_state state;
int code = eexec_param(op, &state.cstate);
if ( code < 0 )
return code;
return filter_write(op, code, &s_exE_template, (stream_state *)&state,
0);
}
/* <source> <seed> eexecDecode/filter <file> */
/* <source> <dict> eexecDecode/filter <file> */
private int
zexD(register os_ptr op)
{ stream_exD_state state;
int code;
(*s_exD_template.set_defaults)((stream_state *)&state);
if ( r_has_type(op, t_dictionary) ) {
uint cstate;
check_dict_read(*op);
if ( (code = dict_uint_param(op, "seed", 0, 0xffff, 0x10000,
&cstate)) < 0 ||
(code = dict_int_param(op, "lenIV", 0, max_int, 4,
&state.lenIV)) < 0
)
return code;
state.cstate = cstate;
code = 1;
} else {
code = eexec_param(op, &state.cstate);
}
if ( code < 0 )
return code;
/* If we're reading a .PFB file, let the filter know about it, */
/* so it can read recklessly to the end of the binary section. */
state.pfb_state = 0;
if ( r_has_type(op - 1, t_file) )
{ stream *s = (op - 1)->value.pfile;
if ( s->state != 0 && s->state->template == &s_PFBD_template )
state.pfb_state = (stream_PFBD_state *)s->state;
}
state.binary = -1;
return filter_read(op, code, &s_exD_template, (stream_state *)&state,
0);
}
/* ------ Initialization procedure ------ */
BEGIN_OP_DEFS(zmisc1_op_defs) {
{"3.type1encrypt", ztype1encrypt},
{"3.type1decrypt", ztype1decrypt},
op_def_begin_filter(),
{"2eexecEncode", zexE},
{"2eexecDecode", zexD},
END_OP_DEFS(0) }
|
