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
|
/* $Header$
This is dvipdfm, a DVI to PDF translator.
Copyright (C) 1998, 1999 by Mark A. Wicks
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
The author may be contacted via the e-mail address
mwicks@kettering.edu
*/
#include <stdio.h>
#include <ctype.h>
static int nextch(void)
{
int ch;
while ((ch = getchar()) >= 0) {
if (ch >= '!' && ch <= 'u' || ch == 'z')
return ch;
if (ch == '~' && getchar() == '>') {
return -1;
}
}
if (ch < 0) {
fprintf (stderr, "Premature end of file.\n");
exit(1);
}
}
unsigned long int ascii85;
unsigned binary[4];
static decode_block(void)
{
int i;
for (i=3; i>=0; i--){
binary[i] = ascii85 % 256u;
ascii85 /= 256u;
}
}
static output_block (int n)
{
int i;
for (i=0; i<n; i++) {
putchar (binary[i]);
}
}
main (int argc, char *argv[])
{
int i, ch, eof = 0, nread;
while (!eof) {
ascii85 = 0;
nread = 0;
/* Look ahead for special zero key */
if ((ch = nextch()) == 'z') {
nread = 4; /* Lie to it */
} else{
ungetc (ch, stdin);
for (i=0; i<5; i++) {
if ((ch=nextch()) < 0) {
eof = 1;
break;
}
ascii85 = ascii85 * 85 + (ch-'!');
nread += 1;
}
}
if (nread > 1) {
decode_block();
output_block(nread-1);
}
}
}
|