44 #define BASE 65521UL    /* largest prime smaller than 65536 */  macro
58         if (a >= (BASE << 16)) a -= (BASE << 16); \
59         if (a >= (BASE << 15)) a -= (BASE << 15); \
60         if (a >= (BASE << 14)) a -= (BASE << 14); \
61         if (a >= (BASE << 13)) a -= (BASE << 13); \
62         if (a >= (BASE << 12)) a -= (BASE << 12); \
63         if (a >= (BASE << 11)) a -= (BASE << 11); \
64         if (a >= (BASE << 10)) a -= (BASE << 10); \
65         if (a >= (BASE << 9)) a -= (BASE << 9); \
66         if (a >= (BASE << 8)) a -= (BASE << 8); \
67         if (a >= (BASE << 7)) a -= (BASE << 7); \
68         if (a >= (BASE << 6)) a -= (BASE << 6); \
69         if (a >= (BASE << 5)) a -= (BASE << 5); \
70         if (a >= (BASE << 4)) a -= (BASE << 4); \
71         if (a >= (BASE << 3)) a -= (BASE << 3); \
72         if (a >= (BASE << 2)) a -= (BASE << 2); \
73         if (a >= (BASE << 1)) a -= (BASE << 1); \
74         if (a >= BASE) a -= BASE; \
78         if (a >= (BASE << 4)) a -= (BASE << 4); \
79         if (a >= (BASE << 3)) a -= (BASE << 3); \
80         if (a >= (BASE << 2)) a -= (BASE << 2); \
81         if (a >= (BASE << 1)) a -= (BASE << 1); \
82         if (a >= BASE) a -= BASE; \
85 #  define MOD(a) a %= BASE
86 #  define MOD4(a) a %= BASE
103         if (adler >= BASE)  in adler32()
104             adler -= BASE;  in adler32()
106         if (sum2 >= BASE)  in adler32()
107             sum2 -= BASE;  in adler32()
121         if (adler >= BASE)  in adler32()
122             adler -= BASE;  in adler32()
168     rem = (unsigned)(len2 % BASE);  in adler32_combine()
172     sum1 += (adler2 & 0xffff) + BASE - 1;  in adler32_combine()
173     sum2 += ((adler1 >> 16) & 0xffff) + ((adler2 >> 16) & 0xffff) + BASE - rem;  in adler32_combine()
174     if (sum1 > BASE) sum1 -= BASE;  in adler32_combine()
175     if (sum1 > BASE) sum1 -= BASE;  in adler32_combine()
176     if (sum2 > (BASE << 1)) sum2 -= (BASE << 1);  in adler32_combine()
177     if (sum2 > BASE) sum2 -= BASE;  in adler32_combine()