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
|
#include <u.h>
#include <libc.h>
#include <draw.h>
Image *
creadimage(Display *d, int fd, int dolock)
{
char hdr[5*12+1];
Rectangle r;
int m, nb, miny, maxy, new, ldepth, ncblock;
uchar *buf, *a;
Image *i;
u32int chan;
if(readn(fd, hdr, 5*12) != 5*12)
return nil;
/*
* distinguish new channel descriptor from old ldepth.
* channel descriptors have letters as well as numbers,
* while ldepths are a single digit formatted as %-11d.
*/
new = 0;
for(m=0; m<10; m++){
if(hdr[m] != ' '){
new = 1;
break;
}
}
if(hdr[11] != ' '){
werrstr("creadimage: bad format");
return nil;
}
if(new){
hdr[11] = '\0';
if((chan = strtochan(hdr)) == 0){
werrstr("creadimage: bad channel string %s", hdr);
return nil;
}
}else{
ldepth = ((int)hdr[10])-'0';
if(ldepth<0 || ldepth>3){
werrstr("creadimage: bad ldepth %d", ldepth);
return nil;
}
chan = drawld2chan[ldepth];
}
r.min.x=atoi(hdr+1*12);
r.min.y=atoi(hdr+2*12);
r.max.x=atoi(hdr+3*12);
r.max.y=atoi(hdr+4*12);
if(r.min.x>r.max.x || r.min.y>r.max.y){
werrstr("creadimage: bad rectangle");
return nil;
}
if(dolock)
lockdisplay(d);
i = allocimage(d, r, chan, 0, 0);
if(dolock)
unlockdisplay(d);
if(i == nil)
return nil;
ncblock = _compblocksize(r, i->depth);
buf = malloc(ncblock);
if(buf == nil)
goto Errout;
miny = r.min.y;
while(miny != r.max.y){
if(readn(fd, hdr, 2*12) != 2*12){
Errout:
if(dolock)
lockdisplay(d);
Erroutlock:
freeimage(i);
if(dolock)
unlockdisplay(d);
free(buf);
return nil;
}
maxy = atoi(hdr+0*12);
nb = atoi(hdr+1*12);
if(maxy<=miny || r.max.y<maxy){
werrstr("creadimage: bad maxy %d", maxy);
goto Errout;
}
if(nb<=0 || ncblock<nb){
werrstr("creadimage: bad count %d", nb);
goto Errout;
}
if(readn(fd, buf, nb)!=nb)
goto Errout;
if(dolock)
lockdisplay(d);
a = bufimage(i->display, 21+nb);
if(a == nil)
goto Erroutlock;
a[0] = 'Y';
BPLONG(a+1, i->id);
BPLONG(a+5, r.min.x);
BPLONG(a+9, miny);
BPLONG(a+13, r.max.x);
BPLONG(a+17, maxy);
if(!new) /* old image: flip the data bits */
_twiddlecompressed(buf, nb);
memmove(a+21, buf, nb);
if(dolock)
unlockdisplay(d);
miny = maxy;
}
free(buf);
return i;
}
|