Subversion Repositories planix.SVN

Rev

Rev 2 | Details | Compare with Previous | Last modification | View Log | RSS feed

Rev Author Line No. Line
2 - 1 
#include <u.h>
2 
#include <libc.h>
3 
#include <flate.h>
4 
#include "zlib.h"
5 
 
6 
int
7 
deflatezlibblock(uchar *dst, int dsize, uchar *src, int ssize, int level, int debug)
8 
{
9 
	ulong adler;
10 
	int n;
11 
 
12 
	if(dsize < 6)
13 
		return FlateOutputFail;
14 
 
15 
	n = deflateblock(dst + 2, dsize - 6, src, ssize, level, debug);
16 
	if(n < 0)
17 
		return n;
18 
 
19 
	dst[0] = ZlibDeflate | ZlibWin32k;
20 
 
21 
	/* bogus zlib encoding of compression level */
22 
	dst[1] = ((level > 2) + (level > 5) + (level > 8)) << 6;
23 
 
24 
	/* header check field */
25 
	dst[1] |= 31 - ((dst[0] << 8) | dst[1]) % 31;
26 
 
27 
	adler = adler32(1, src, ssize);
28 
	dst[n + 2] = adler >> 24;
29 
	dst[n + 3] = adler >> 16;
30 
	dst[n + 4] = adler >> 8;
31 
	dst[n + 5] = adler;
32 
 
33 
	return n + 6;
34 
}