6 typedef struct ZRead ZRead;
12 int (*r)(void*, void*, int);
16 zlread(void *vzr, void *buf, int n)
21 n = (*zr->r)(zr->rr, buf, n);
24 zr->adler = adler32(zr->adler, buf, n);
29 deflatezlib(void *wr, int (*w)(void*, void*, int), void *rr, int (*r)(void*, void*, int), int level, int debug)
35 buf[0] = ZlibDeflate | ZlibWin32k;
37 /* bogus zlib encoding of compression level */
38 buf[1] = ((level > 2) + (level > 5) + (level > 8)) << 6;
40 /* header check field */
41 buf[1] |= 31 - ((buf[0] << 8) | buf[1]) % 31;
42 if((*w)(wr, buf, 2) != 2)
43 return FlateOutputFail;
48 ok = deflate(wr, w, &zr, zlread, level, debug);
52 buf[0] = zr.adler >> 24;
53 buf[1] = zr.adler >> 16;
54 buf[2] = zr.adler >> 8;
56 if((*w)(wr, buf, 4) != 4)
57 return FlateOutputFail;