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https://github.com/ramsey/uuid.git
synced 2026-06-14 15:56:48 +03:00
Ben Ramsey
692175901d
The 6 bytes obtained from `random_bytes()` is a 48-bit integer, which cannot be converted to decimal on a 32-bit system, without being implicitly cast to a float by PHP. This was causing problems with setting the multicast bit, and it led to non-random node values. This new approach splits the 6 bytes up into two 3-byte values, each a 24-bit integer, and applies the multicast bit to the most significant bits before re-combining the bytes as a string.
106 lines
3.0 KiB
PHP
106 lines
3.0 KiB
PHP
<?php
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namespace Ramsey\Uuid\Test\Provider\Node;
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use Ramsey\Uuid\Provider\Node\RandomNodeProvider;
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use Ramsey\Uuid\Test\TestCase;
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use AspectMock\Test as AspectMock;
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class RandomNodeProviderTest extends TestCase
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{
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protected function tearDown()
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{
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parent::tearDown();
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AspectMock::clean();
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}
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/**
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* @runInSeparateProcess
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* @preserveGlobalState disabled
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*/
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public function testGetNodeUsesRandomBytes()
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{
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$bytes = hex2bin('38a675685d50');
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$randomBytes = AspectMock::func('Ramsey\Uuid\Provider\Node', 'random_bytes', $bytes);
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$provider = new RandomNodeProvider();
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$provider->getNode();
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$randomBytes->verifyInvoked([6]);
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}
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/**
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* @runInSeparateProcess
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* @preserveGlobalState disabled
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*/
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public function testGetNodeSetsMulticastBit()
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{
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$bytes = hex2bin('38a675685d50');
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// Expected node has the multicast bit set, and it wasn't set in the bytes.
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$expectedNode = '39a675685d50';
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AspectMock::func('Ramsey\Uuid\Provider\Node', 'random_bytes', $bytes);
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$provider = new RandomNodeProvider();
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$this->assertSame($expectedNode, $provider->getNode());
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}
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/**
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* @runInSeparateProcess
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* @preserveGlobalState disabled
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*/
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public function testGetNodeAlreadyHasMulticastBit()
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{
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$bytesHex = '4161a1ff5d50';
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$bytes = hex2bin($bytesHex);
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// We expect the same hex value for the node.
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$expectedNode = $bytesHex;
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AspectMock::func('Ramsey\Uuid\Provider\Node', 'random_bytes', $bytes);
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$provider = new RandomNodeProvider();
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$this->assertSame($expectedNode, $provider->getNode());
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}
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/**
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* @runInSeparateProcess
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* @preserveGlobalState disabled
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*/
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public function testGetNodeSetsMulticastBitForLowNodeValue()
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{
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$bytes = hex2bin('100000000001');
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$expectedNode = '110000000001';
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AspectMock::func('Ramsey\Uuid\Provider\Node', 'random_bytes', $bytes);
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$provider = new RandomNodeProvider();
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$this->assertSame($expectedNode, $provider->getNode());
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}
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public function testGetNodeAlwaysSetsMulticastBit()
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{
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$provider = new RandomNodeProvider();
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$nodeHex = $provider->getNode();
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// Convert what we got into bytes so that we can mask out everything
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// except the multicast bit. If the multicast bit doesn't exist, this
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// test will fail appropriately.
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$nodeBytes = hex2bin($nodeHex);
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// Split the node bytes for math on 32-bit systems.
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$nodeMsb = substr($nodeBytes, 0, 3);
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$nodeLsb = substr($nodeBytes, 3);
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// Only set bits that match the mask so we can see that the multicast
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// bit is always set.
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$nodeMsb = sprintf('%06x', hexdec(bin2hex($nodeMsb)) & 0x010000);
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$nodeLsb = sprintf('%06x', hexdec(bin2hex($nodeLsb)) & 0x000000);
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// Recombine the node bytes.
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$node = $nodeMsb . $nodeLsb;
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$this->assertSame('010000000000', $node);
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}
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}
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