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
|
/*
* Unpacks the raster data from the packed buffer. This code was
* translated from pktopx.web using an automatic translator, then
* converted for this purpose. This little routine can be very useful
* in other drivers as well.
*/
#include "dvips.h" /* The copyright notice in that file is included too! */
/*
* external procedures
*/
#include "protos.h"
/*
* Some statics for use here.
*/
static halfword bitweight ;
static halfword dynf ;
static halfword gpower[17] = { 0 , 1 , 3 , 7 , 15 , 31 , 63 , 127 ,
255 , 511 , 1023 , 2047 , 4095 , 8191 , 16383 , 32767 , 65535 } ;
static long repeatcount ;
static quarterword *p ;
/*
* We need procedures to get a nybble, bit, and packed word from the
* packed data structure.
*/
shalfword
getnyb P1H(void)
{
if ( bitweight == 0 )
{ bitweight = 16 ;
return(*p++ & 15) ;
} else {
bitweight = 0 ;
return(*p >> 4) ;
}
}
Boolean
getbit P1H(void)
{
bitweight >>= 1 ;
if ( bitweight == 0 )
{ p++ ;
bitweight = 128 ;
}
return(*p & bitweight) ;
}
long pkpackednum P1H(void) {
register halfword i;
register long j ;
i = getnyb () ;
if ( i == 0 ) {
do { j = getnyb () ;
i++ ;
} while ( j == 0 ) ;
while ( i != 0 ) {
j = j * 16 + ((long) getnyb ()) ;
i-- ;
}
return ( j - 15 + ( 13 - dynf ) * 16 + dynf ) ;
}
else if ( i <= dynf ) return ( i ) ;
else if ( i < 14 ) return ( ( i - dynf - 1 )*16 + getnyb() + dynf + 1 ) ;
else {
if (repeatcount != 0)
error("! recursive repeat count in pk file") ;
repeatcount = 1 ;
if ( i == 14 ) repeatcount = pkpackednum () ;
return ( pkpackednum() ) ;
}
}
void flip P2C(register char *, s, register long, howmany)
{
register char t ;
while (howmany > 0) {
t = *s ;
*s = s[1] ;
s[1] = t ;
howmany-- ;
s += 2 ;
}
}
/*
* And now we have our main routine.
*/
static halfword bftest = 1 ;
long
unpack P5C(quarterword *, pack, halfword *, raster,
halfword, cwidth, halfword, cheight, halfword, cmd)
{
register integer i, j ;
shalfword wordwidth ;
register halfword word, wordweight ;
shalfword rowsleft ;
Boolean turnon ;
shalfword hbit, ww ;
long count ;
halfword *oraster ;
oraster = raster ;
p = pack ;
dynf = cmd / 16 ;
turnon = cmd & 8 ;
wordwidth = (cwidth + 15)/16 ;
if ( dynf == 14 )
{ bitweight = 256 ;
for ( i = 1 ; i <= cheight ; i ++ )
{ word = 0 ;
wordweight = 32768 ;
for ( j = 1 ; j <= cwidth ; j ++ )
{ if ( getbit () ) word += wordweight ;
wordweight >>= 1 ;
if ( wordweight == 0 )
{ *raster++ = word ;
word = 0 ;
wordweight = 32768 ;
}
}
if ( wordweight != 32768 )
*raster++ = word ;
}
} else {
rowsleft = cheight ;
hbit = cwidth ;
repeatcount = 0 ;
ww = 16 ;
word = 0 ;
bitweight = 16 ;
while ( rowsleft > 0 )
{ count = pkpackednum() ;
while ( count != 0 )
{ if ( ( count <= ww ) && ( count < hbit ) )
{ if ( turnon ) word += gpower [ ww ] - gpower
[ ww - count ] ;
hbit -= count ;
ww -= count ;
count = 0 ;
}
else if ( ( count >= hbit ) && ( hbit <= ww ) )
{ if ( turnon )
word += gpower[ww] - gpower[ww-hbit] ;
*raster++ = word ;
for ( i = 1 ; i <= repeatcount ; i ++ ) {
for ( j = 1 ; j <= wordwidth ; j ++ ) {
*raster = *(raster - wordwidth) ;
raster++ ;
}
}
rowsleft -= repeatcount + 1 ;
repeatcount = 0 ;
word = 0 ;
ww = 16 ;
count -= hbit ;
hbit = cwidth ;
}
else
{ if ( turnon ) word += gpower [ ww ] ;
*raster++ = word ;
word = 0 ;
count -= ww ;
hbit -= ww ;
ww = 16 ;
}
}
turnon = ! turnon ;
}
if ( ( rowsleft != 0 ) || ( (unsigned)hbit != cwidth ) )
error ( "! error while unpacking; more bits than required" ) ;
}
if (*(char *)&bftest) /* is the hardware LittleEndian? */
flip((char *)oraster, ((cwidth + 15) >> 4) * (long)cheight) ;
return(p-pack) ;
}
|
