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UID optimizations addressing BIT-1016.

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Max UID bit-length is now 128, but can be increased w/ trivial source
code change of BRO_UID_LEN.
This commit is contained in:
Jon Siwek 2013-08-28 15:35:18 -05:00
parent 0592b528ef
commit 5c119561ad
6 changed files with 60 additions and 42 deletions
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29
src/UID.cc
View file

@ -7,39 +7,30 @@
using namespace Bro;
using namespace std;
void UID::Set(bro_uint_t bits, const std::vector<uint64>& v)
void UID::Set(bro_uint_t bits, const uint64* v, size_t n)
{
uid.clear();
initialized = true;
for ( size_t i = 0; i < BRO_UID_LEN; ++i )
uid[i] = 0;
if ( bits > BRO_UID_LEN * 64 )
bits = BRO_UID_LEN * 64;
div_t res = div(bits, 64);
size_t size = res.rem ? res.quot + 1 : res.quot;
for ( size_t i = 0; i < size; ++i )
uid.push_back(i < v.size() ? v[i] : calculate_unique_id());
uid[i] = v && i < n ? v[i] : calculate_unique_id();
if ( res.rem )
uid[0] >>= 64 - res.rem;
}
string UID::Base62(const std::string& prefix) const
{
char tmp[64]; // technically, this should dynamically scale based on size
string rval(prefix);
for ( size_t i = 0; i < uid.size(); ++i )
rval.append(uitoa_n(uid[i], tmp, sizeof(tmp), 62));
return rval;
}
bool Bro::operator==(const UID& u1, const UID& u2)
{
if ( u1.uid.size() != u2.uid.size() )
return false;
for ( size_t i = 0; i < u1.uid.size(); ++i )
for ( size_t i = 0; i < BRO_UID_LEN; ++i )
if ( u1.uid[i] != u2.uid[i] )
return false;
return true;
}