1 ed7c8e8d 2003-09-30 devnull #include <u.h>
 2 ed7c8e8d 2003-09-30 devnull #include <libc.h>
 3 ed7c8e8d 2003-09-30 devnull #include <draw.h>
 4 ed7c8e8d 2003-09-30 devnull 
 5 ed7c8e8d 2003-09-30 devnull /*
 6 fa325e9b 2020-01-10 cross  * compressed data are seuences of byte codes.
 7 ed7c8e8d 2003-09-30 devnull  * if the first byte b has the 0x80 bit set, the next (b^0x80)+1 bytes
 8 ed7c8e8d 2003-09-30 devnull  * are data.  otherwise, it's two bytes specifying a previous string to repeat.
 9 ed7c8e8d 2003-09-30 devnull  */
10 ed7c8e8d 2003-09-30 devnull void
11 ed7c8e8d 2003-09-30 devnull _twiddlecompressed(uchar *buf, int n)
12 ed7c8e8d 2003-09-30 devnull {
13 ed7c8e8d 2003-09-30 devnull 	uchar *ebuf;
14 ed7c8e8d 2003-09-30 devnull 	int j, k, c;
15 ed7c8e8d 2003-09-30 devnull 
16 ed7c8e8d 2003-09-30 devnull 	ebuf = buf+n;
17 ed7c8e8d 2003-09-30 devnull 	while(buf < ebuf){
18 ed7c8e8d 2003-09-30 devnull 		c = *buf++;
19 ed7c8e8d 2003-09-30 devnull 		if(c >= 128){
20 ed7c8e8d 2003-09-30 devnull 			k = c-128+1;
21 ed7c8e8d 2003-09-30 devnull 			for(j=0; j<k; j++, buf++)
22 ed7c8e8d 2003-09-30 devnull 				*buf ^= 0xFF;
23 ed7c8e8d 2003-09-30 devnull 		}else
24 ed7c8e8d 2003-09-30 devnull 			buf++;
25 ed7c8e8d 2003-09-30 devnull 	}
26 ed7c8e8d 2003-09-30 devnull }
27 ed7c8e8d 2003-09-30 devnull 
28 ed7c8e8d 2003-09-30 devnull int
29 ed7c8e8d 2003-09-30 devnull _compblocksize(Rectangle r, int depth)
30 ed7c8e8d 2003-09-30 devnull {
31 ed7c8e8d 2003-09-30 devnull 	int bpl;
32 ed7c8e8d 2003-09-30 devnull 
33 ed7c8e8d 2003-09-30 devnull 	bpl = bytesperline(r, depth);
34 ed7c8e8d 2003-09-30 devnull 	bpl = 2*bpl;	/* add plenty extra for blocking, etc. */
35 ed7c8e8d 2003-09-30 devnull 	if(bpl < NCBLOCK)
36 ed7c8e8d 2003-09-30 devnull 		return NCBLOCK;
37 ed7c8e8d 2003-09-30 devnull 	return bpl;
38 ed7c8e8d 2003-09-30 devnull }