1 324891a5 2006-06-25 devnull #include <u.h>
  2 324891a5 2006-06-25 devnull #include <libc.h>
  3 324891a5 2006-06-25 devnull #include <draw.h>
  4 324891a5 2006-06-25 devnull #include <memdraw.h>
  5 324891a5 2006-06-25 devnull 
  6 324891a5 2006-06-25 devnull Memimage*
  7 324891a5 2006-06-25 devnull readmemimage(int fd)
  8 324891a5 2006-06-25 devnull {
  9 324891a5 2006-06-25 devnull 	char hdr[5*12+1];
 10 324891a5 2006-06-25 devnull 	int dy;
 11 324891a5 2006-06-25 devnull 	u32int chan;
 12 324891a5 2006-06-25 devnull 	uint l, n;
 13 324891a5 2006-06-25 devnull 	int m, j;
 14 324891a5 2006-06-25 devnull 	int new, miny, maxy;
 15 324891a5 2006-06-25 devnull 	Rectangle r;
 16 324891a5 2006-06-25 devnull 	uchar *tmp;
 17 324891a5 2006-06-25 devnull 	int ldepth, chunk;
 18 324891a5 2006-06-25 devnull 	Memimage *i;
 19 324891a5 2006-06-25 devnull 
 20 324891a5 2006-06-25 devnull 	if(readn(fd, hdr, 11) != 11){
 21 324891a5 2006-06-25 devnull 		werrstr("readimage: short header");
 22 324891a5 2006-06-25 devnull 		return nil;
 23 324891a5 2006-06-25 devnull 	}
 24 324891a5 2006-06-25 devnull 	if(memcmp(hdr, "compressed\n", 11) == 0)
 25 324891a5 2006-06-25 devnull 		return creadmemimage(fd);
 26 324891a5 2006-06-25 devnull 	if(readn(fd, hdr+11, 5*12-11) != 5*12-11){
 27 324891a5 2006-06-25 devnull 		werrstr("readimage: short header (2)");
 28 324891a5 2006-06-25 devnull 		return nil;
 29 324891a5 2006-06-25 devnull 	}
 30 324891a5 2006-06-25 devnull 
 31 324891a5 2006-06-25 devnull 	/*
 32 324891a5 2006-06-25 devnull 	 * distinguish new channel descriptor from old ldepth.
 33 324891a5 2006-06-25 devnull 	 * channel descriptors have letters as well as numbers,
 34 324891a5 2006-06-25 devnull 	 * while ldepths are a single digit formatted as %-11d.
 35 324891a5 2006-06-25 devnull 	 */
 36 324891a5 2006-06-25 devnull 	new = 0;
 37 324891a5 2006-06-25 devnull 	for(m=0; m<10; m++){
 38 324891a5 2006-06-25 devnull 		if(hdr[m] != ' '){
 39 324891a5 2006-06-25 devnull 			new = 1;
 40 324891a5 2006-06-25 devnull 			break;
 41 324891a5 2006-06-25 devnull 		}
 42 324891a5 2006-06-25 devnull 	}
 43 324891a5 2006-06-25 devnull 	if(hdr[11] != ' '){
 44 324891a5 2006-06-25 devnull 		werrstr("readimage: bad format");
 45 324891a5 2006-06-25 devnull 		return nil;
 46 324891a5 2006-06-25 devnull 	}
 47 324891a5 2006-06-25 devnull 	if(new){
 48 324891a5 2006-06-25 devnull 		hdr[11] = '\0';
 49 324891a5 2006-06-25 devnull 		if((chan = strtochan(hdr)) == 0){
 50 324891a5 2006-06-25 devnull 			werrstr("readimage: bad channel string %s", hdr);
 51 324891a5 2006-06-25 devnull 			return nil;
 52 324891a5 2006-06-25 devnull 		}
 53 324891a5 2006-06-25 devnull 	}else{
 54 324891a5 2006-06-25 devnull 		ldepth = ((int)hdr[10])-'0';
 55 324891a5 2006-06-25 devnull 		if(ldepth<0 || ldepth>3){
 56 324891a5 2006-06-25 devnull 			werrstr("readimage: bad ldepth %d", ldepth);
 57 324891a5 2006-06-25 devnull 			return nil;
 58 324891a5 2006-06-25 devnull 		}
 59 324891a5 2006-06-25 devnull 		chan = drawld2chan[ldepth];
 60 324891a5 2006-06-25 devnull 	}
 61 324891a5 2006-06-25 devnull 
 62 324891a5 2006-06-25 devnull 	r.min.x = atoi(hdr+1*12);
 63 324891a5 2006-06-25 devnull 	r.min.y = atoi(hdr+2*12);
 64 324891a5 2006-06-25 devnull 	r.max.x = atoi(hdr+3*12);
 65 324891a5 2006-06-25 devnull 	r.max.y = atoi(hdr+4*12);
 66 324891a5 2006-06-25 devnull 	if(r.min.x>r.max.x || r.min.y>r.max.y){
 67 324891a5 2006-06-25 devnull 		werrstr("readimage: bad rectangle");
 68 324891a5 2006-06-25 devnull 		return nil;
 69 324891a5 2006-06-25 devnull 	}
 70 324891a5 2006-06-25 devnull 
 71 324891a5 2006-06-25 devnull 	miny = r.min.y;
 72 324891a5 2006-06-25 devnull 	maxy = r.max.y;
 73 324891a5 2006-06-25 devnull 
 74 324891a5 2006-06-25 devnull 	l = bytesperline(r, chantodepth(chan));
 75 324891a5 2006-06-25 devnull 	i = allocmemimage(r, chan);
 76 324891a5 2006-06-25 devnull 	if(i == nil)
 77 324891a5 2006-06-25 devnull 		return nil;
 78 324891a5 2006-06-25 devnull 	chunk = 32*1024;
 79 324891a5 2006-06-25 devnull 	if(chunk < l)
 80 324891a5 2006-06-25 devnull 		chunk = l;
 81 324891a5 2006-06-25 devnull 	tmp = malloc(chunk);
 82 324891a5 2006-06-25 devnull 	if(tmp == nil)
 83 324891a5 2006-06-25 devnull 		goto Err;
 84 324891a5 2006-06-25 devnull 	while(maxy > miny){
 85 324891a5 2006-06-25 devnull 		dy = maxy - miny;
 86 324891a5 2006-06-25 devnull 		if(dy*l > chunk)
 87 324891a5 2006-06-25 devnull 			dy = chunk/l;
 88 324891a5 2006-06-25 devnull 		if(dy <= 0){
 89 324891a5 2006-06-25 devnull 			werrstr("readmemimage: image too wide for buffer");
 90 324891a5 2006-06-25 devnull 			goto Err;
 91 324891a5 2006-06-25 devnull 		}
 92 324891a5 2006-06-25 devnull 		n = dy*l;
 93 324891a5 2006-06-25 devnull 		m = readn(fd, tmp, n);
 94 324891a5 2006-06-25 devnull 		if(m != n){
 95 324891a5 2006-06-25 devnull 			werrstr("readmemimage: read count %d not %d: %r", m, n);
 96 324891a5 2006-06-25 devnull    Err:
 97 324891a5 2006-06-25 devnull  			freememimage(i);
 98 324891a5 2006-06-25 devnull 			free(tmp);
 99 324891a5 2006-06-25 devnull 			return nil;
100 324891a5 2006-06-25 devnull 		}
101 324891a5 2006-06-25 devnull 		if(!new)	/* an old image: must flip all the bits */
102 324891a5 2006-06-25 devnull 			for(j=0; j<chunk; j++)
103 324891a5 2006-06-25 devnull 				tmp[j] ^= 0xFF;
104 324891a5 2006-06-25 devnull 
105 324891a5 2006-06-25 devnull 		if(loadmemimage(i, Rect(r.min.x, miny, r.max.x, miny+dy), tmp, chunk) <= 0)
106 324891a5 2006-06-25 devnull 			goto Err;
107 324891a5 2006-06-25 devnull 		miny += dy;
108 324891a5 2006-06-25 devnull 	}
109 324891a5 2006-06-25 devnull 	free(tmp);
110 324891a5 2006-06-25 devnull 	return i;
111 324891a5 2006-06-25 devnull }