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- #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;
- ulong 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(d){
- if(dolock)
- lockdisplay(d);
- i = allocimage(d, r, chan, 0, 0);
- if(dolock)
- unlockdisplay(d);
- if(i == nil)
- return nil;
- }else{
- i = mallocz(sizeof(Image), 1);
- if(i == nil)
- return nil;
- }
- ncblock = _compblocksize(r, chantodepth(chan));
- 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(d){
- 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;
- }
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