libkern/zlib/adler32.c

48 #define BASE 65521UL    /* largest prime smaller than 65536 */
50 /* NMAX is the largest n such that 255n(n+1)/2 + (n+1)(BASE-1) <= 2^32-1 */
62         if (a >= (BASE << 16)) a -= (BASE << 16); \
63         if (a >= (BASE << 15)) a -= (BASE << 15); \
64         if (a >= (BASE << 14)) a -= (BASE << 14); \
65         if (a >= (BASE << 13)) a -= (BASE << 13); \
66         if (a >= (BASE << 12)) a -= (BASE << 12); \
67         if (a >= (BASE << 11)) a -= (BASE << 11); \
68         if (a >= (BASE << 10)) a -= (BASE << 10); \
69         if (a >= (BASE << 9)) a -= (BASE << 9); \
70         if (a >= (BASE << 8)) a -= (BASE << 8); \
71         if (a >= (BASE << 7)) a -= (BASE << 7); \
72         if (a >= (BASE << 6)) a -= (BASE << 6); \
73         if (a >= (BASE << 5)) a -= (BASE << 5); \
74         if (a >= (BASE << 4)) a -= (BASE << 4); \
75         if (a >= (BASE << 3)) a -= (BASE << 3); \
76         if (a >= (BASE << 2)) a -= (BASE << 2); \
77         if (a >= (BASE << 1)) a -= (BASE << 1); \
78         if (a >= BASE) a -= BASE; \
82         if (a >= (BASE << 4)) a -= (BASE << 4); \
83         if (a >= (BASE << 3)) a -= (BASE << 3); \
84         if (a >= (BASE << 2)) a -= (BASE << 2); \
85         if (a >= (BASE << 1)) a -= (BASE << 1); \
86         if (a >= BASE) a -= BASE; \
89 #  define MOD(a) a %= BASE
90 #  define MOD4(a) a %= BASE
109         if (adler >= BASE)
110             adler -= BASE;
112         if (sum2 >= BASE)
113             sum2 -= BASE;
127         if (adler >= BASE)
128             adler -= BASE;
129         MOD4(sum2);             /* only added so many BASE's */
141         if (adler >= BASE) adler -= BASE;
142         MOD4(sum2);             /* only added so many BASE's */
192     rem = (unsigned)(len2 % BASE);
196     sum1 += (adler2 & 0xffff) + BASE - 1;
197     sum2 += ((adler1 >> 16) & 0xffff) + ((adler2 >> 16) & 0xffff) + BASE - rem;
198     if (sum1 > BASE) sum1 -= BASE;
199     if (sum1 > BASE) sum1 -= BASE;
200     if (sum2 > (BASE << 1)) sum2 -= (BASE << 1);
201     if (sum2 > BASE) sum2 -= BASE;