ref: a69ae5ed2a33e8d1a62391e57347285228ba4054
dir: /3rd/mp/mptouv.c/
#include "platform.h" #define VLDIGITS (int)(sizeof(int64_t)/Dbytes) /* * this code assumes that a int64_t is an integral number of * mpdigits long. */ mpint* uvtomp(uint64_t v, mpint *b) { int s; if(b == nil) b = mpnew(VLDIGITS*Dbits); else mpbits(b, VLDIGITS*Dbits); b->sign = 1; for(s = 0; s < VLDIGITS; s++){ b->p[s] = v; #ifndef BITS64 v >>= Dbits; #endif } b->top = s; return mpnorm(b); } uint64_t mptouv(mpint *b) { uint64_t v; uint32_t s; if(b->top == 0 || b->sign < 0) return 0LL; if(b->top > VLDIGITS) return -1LL; v = 0ULL; for(s = 0; s < b->top; s++) v |= (uint64_t)b->p[s]<<(s*Dbits); return v; }