1 76193d7c 2003-09-30 devnull #include <u.h>
2 76193d7c 2003-09-30 devnull #include <libc.h>
3 76193d7c 2003-09-30 devnull #include <draw.h>
4 76193d7c 2003-09-30 devnull #include <memdraw.h>
7 76193d7c 2003-09-30 devnull creadmemimage(int fd)
9 76193d7c 2003-09-30 devnull char hdr[5*12+1];
10 76193d7c 2003-09-30 devnull Rectangle r;
11 76193d7c 2003-09-30 devnull int m, nb, miny, maxy, new, ldepth, ncblock;
12 76193d7c 2003-09-30 devnull uchar *buf;
13 76193d7c 2003-09-30 devnull Memimage *i;
14 76193d7c 2003-09-30 devnull u32int chan;
16 76193d7c 2003-09-30 devnull if(readn(fd, hdr, 5*12) != 5*12){
17 76193d7c 2003-09-30 devnull werrstr("readmemimage: short header (2)");
18 76193d7c 2003-09-30 devnull return nil;
22 76193d7c 2003-09-30 devnull * distinguish new channel descriptor from old ldepth.
23 76193d7c 2003-09-30 devnull * channel descriptors have letters as well as numbers,
24 76193d7c 2003-09-30 devnull * while ldepths are a single digit formatted as %-11d.
27 76193d7c 2003-09-30 devnull for(m=0; m<10; m++){
28 76193d7c 2003-09-30 devnull if(hdr[m] != ' '){
33 76193d7c 2003-09-30 devnull if(hdr[11] != ' '){
34 76193d7c 2003-09-30 devnull werrstr("creadimage: bad format");
35 76193d7c 2003-09-30 devnull return nil;
38 76193d7c 2003-09-30 devnull hdr[11] = '\0';
39 76193d7c 2003-09-30 devnull if((chan = strtochan(hdr)) == 0){
40 76193d7c 2003-09-30 devnull werrstr("creadimage: bad channel string %s", hdr);
41 76193d7c 2003-09-30 devnull return nil;
44 76193d7c 2003-09-30 devnull ldepth = ((int)hdr[10])-'0';
45 76193d7c 2003-09-30 devnull if(ldepth<0 || ldepth>3){
46 76193d7c 2003-09-30 devnull werrstr("creadimage: bad ldepth %d", ldepth);
47 76193d7c 2003-09-30 devnull return nil;
49 76193d7c 2003-09-30 devnull chan = drawld2chan[ldepth];
51 76193d7c 2003-09-30 devnull r.min.x=atoi(hdr+1*12);
52 76193d7c 2003-09-30 devnull r.min.y=atoi(hdr+2*12);
53 76193d7c 2003-09-30 devnull r.max.x=atoi(hdr+3*12);
54 76193d7c 2003-09-30 devnull r.max.y=atoi(hdr+4*12);
55 76193d7c 2003-09-30 devnull if(r.min.x>r.max.x || r.min.y>r.max.y){
56 76193d7c 2003-09-30 devnull werrstr("creadimage: bad rectangle");
57 76193d7c 2003-09-30 devnull return nil;
60 76193d7c 2003-09-30 devnull i = allocmemimage(r, chan);
61 76193d7c 2003-09-30 devnull if(i == nil)
62 76193d7c 2003-09-30 devnull return nil;
63 76193d7c 2003-09-30 devnull ncblock = _compblocksize(r, i->depth);
64 76193d7c 2003-09-30 devnull buf = malloc(ncblock);
65 76193d7c 2003-09-30 devnull if(buf == nil)
66 76193d7c 2003-09-30 devnull goto Errout;
67 76193d7c 2003-09-30 devnull miny = r.min.y;
68 76193d7c 2003-09-30 devnull while(miny != r.max.y){
69 76193d7c 2003-09-30 devnull if(readn(fd, hdr, 2*12) != 2*12){
70 76193d7c 2003-09-30 devnull Shortread:
71 76193d7c 2003-09-30 devnull werrstr("readmemimage: short read");
73 76193d7c 2003-09-30 devnull freememimage(i);
74 76193d7c 2003-09-30 devnull free(buf);
75 76193d7c 2003-09-30 devnull return nil;
77 76193d7c 2003-09-30 devnull maxy = atoi(hdr+0*12);
78 76193d7c 2003-09-30 devnull nb = atoi(hdr+1*12);
79 76193d7c 2003-09-30 devnull if(maxy<=miny || r.max.y<maxy){
80 76193d7c 2003-09-30 devnull werrstr("readimage: bad maxy %d", maxy);
81 76193d7c 2003-09-30 devnull goto Errout;
83 76193d7c 2003-09-30 devnull if(nb<=0 || ncblock<nb){
84 76193d7c 2003-09-30 devnull werrstr("readimage: bad count %d", nb);
85 76193d7c 2003-09-30 devnull goto Errout;
87 76193d7c 2003-09-30 devnull if(readn(fd, buf, nb)!=nb)
88 76193d7c 2003-09-30 devnull goto Shortread;
89 76193d7c 2003-09-30 devnull if(!new) /* old image: flip the data bits */
90 76193d7c 2003-09-30 devnull _twiddlecompressed(buf, nb);
91 76193d7c 2003-09-30 devnull cloadmemimage(i, Rect(r.min.x, miny, r.max.x, maxy), buf, nb);
92 76193d7c 2003-09-30 devnull miny = maxy;
94 76193d7c 2003-09-30 devnull free(buf);
95 76193d7c 2003-09-30 devnull return i;
