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//
// UUIDGenerator.cpp
//
// Library: Foundation
// Package: UUID
// Module: UUID
//
// Copyright (c) 2004-2006, Applied Informatics Software Engineering GmbH.
// and Contributors.
//
// SPDX-License-Identifier: BSL-1.0
//
#include "Poco/UUIDGenerator.h"
#include "Poco/Thread.h"
#include "Poco/RandomStream.h"
#include "Poco/DigestEngine.h"
#include "Poco/MD5Engine.h"
#include "Poco/SHA1Engine.h"
#include "Poco/SingletonHolder.h"
#include <cstring>
namespace Poco {
UUIDGenerator::UUIDGenerator(): _ticks(0), _haveNode(false)
{
}
UUIDGenerator::~UUIDGenerator()
{
}
UUID UUIDGenerator::create()
{
FastMutex::ScopedLock lock(_mutex);
if (!_haveNode)
{
Environment::nodeId(_node);
_haveNode = true;
}
Timestamp::UtcTimeVal tv = timeStamp();
UInt32 timeLow = UInt32(tv & 0xFFFFFFFF);
UInt16 timeMid = UInt16((tv >> 32) & 0xFFFF);
UInt16 timeHiAndVersion = UInt16((tv >> 48) & 0x0FFF) + (UUID::UUID_TIME_BASED << 12);
UInt16 clockSeq = (UInt16(_random.next() >> 4) & 0x3FFF) | 0x8000;
return UUID(timeLow, timeMid, timeHiAndVersion, clockSeq, _node);
}
UUID UUIDGenerator::createFromName(const UUID& nsid, const std::string& name)
{
MD5Engine md5;
return createFromName(nsid, name, md5);
}
UUID UUIDGenerator::createFromName(const UUID& nsid, const std::string& name, DigestEngine& de)
{
UUID::Version version = UUID::UUID_NAME_BASED;
if (dynamic_cast<SHA1Engine*>(&de)) version = UUID::UUID_NAME_BASED_SHA1;
return createFromName(nsid, name, de, version);
}
UUID UUIDGenerator::createFromName(const UUID& nsid, const std::string& name, DigestEngine& de, UUID::Version version)
{
poco_assert_dbg (de.digestLength() >= 16);
UUID netNsid = nsid;
netNsid.toNetwork();
de.reset();
de.update(&netNsid._timeLow, sizeof(netNsid._timeLow));
de.update(&netNsid._timeMid, sizeof(netNsid._timeMid));
de.update(&netNsid._timeHiAndVersion, sizeof(netNsid._timeHiAndVersion));
de.update(&netNsid._clockSeq, sizeof(netNsid._clockSeq));
de.update(&netNsid._node[0], sizeof(netNsid._node));
de.update(name);
char buffer[16];
const DigestEngine::Digest& d = de.digest();
for (int i = 0; i < 16; ++i)
{
buffer[i] = d[i];
}
return UUID(buffer, version);
}
UUID UUIDGenerator::createRandom()
{
char buffer[16];
RandomInputStream ris;
ris.read(buffer, sizeof(buffer));
return UUID(buffer, UUID::UUID_RANDOM);
}
Timestamp::UtcTimeVal UUIDGenerator::timeStamp()
{
Timestamp now;
for (;;)
{
if (now != _lastTime)
{
_lastTime = now;
_ticks = 0;
break;
}
if (_ticks < 100)
{
++_ticks;
break;
}
now.update();
}
Timestamp::UtcTimeVal tv = now.utcTime();
return tv + _ticks;
}
UUID UUIDGenerator::createOne()
{
try
{
return create();
}
catch (Exception&)
{
return createRandom();
}
}
namespace
{
static SingletonHolder<UUIDGenerator> sh;
}
UUIDGenerator& UUIDGenerator::defaultGenerator()
{
return *sh.get();
}
} // namespace Poco
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