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handle unlikely rounding up after sqrt

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Javier Smooth 2015-04-05 04:39:09 -07:00
parent f2e8348be0
commit 83ddc942c1
1 changed files with 3 additions and 0 deletions
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src/cryptonote_core/blockchain_storage.cpp
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@ -1086,6 +1086,9 @@ bool blockchain_storage::get_random_outs_for_amounts(const COMMAND_RPC_GET_RANDO
uint64_t r = crypto::rand<uint64_t>() % ((uint64_t)1 << 53);
double frac = std::sqrt((double)r / ((uint64_t)1 << 53));
size_t i = (size_t)(frac*up_index_limit);
// just in case rounding up to 1 occurs after sqrt
if (i == up_index_limit)
--i;
if(used.count(i))
continue;
bool added = add_out_to_get_random_outs(amount_outs, result_outs, amount, i);