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* @license http://opensource.org/licenses/MIT MIT * @link https://benramsey.com/projects/ramsey-uuid/ Documentation * @link https://packagist.org/packages/ramsey/uuid Packagist * @link https://github.com/ramsey/uuid GitHub */ namespace Ramsey\Uuid\Codec; use InvalidArgumentException; use Ramsey\Uuid\UuidInterface; /** * OrderedTimeCodec optimizes the bytes to increment UUIDs when time goes by, to improve database INSERTs. * The string value will be unchanged from StringCodec. Only works for UUID type 1. */ class OrderedTimeCodec extends StringCodec { /** * Encodes a UuidInterface as an optimized binary representation of a UUID * * @param UuidInterface $uuid * @return string Binary string representation of a UUID */ public function encodeBinary(UuidInterface $uuid) { $fields = $uuid->getFieldsHex(); $optimized = [ $fields['time_hi_and_version'], $fields['time_mid'], $fields['time_low'], $fields['clock_seq_hi_and_reserved'], $fields['clock_seq_low'], $fields['node'], ]; return hex2bin(implode('', $optimized)); } /** * Decodes an optimized binary representation of a UUID into a UuidInterface object instance * * @param string $bytes * @return UuidInterface * @throws InvalidArgumentException if string has not 16 characters */ public function decodeBytes($bytes) { if (strlen($bytes) !== 16) { throw new InvalidArgumentException('$bytes string should contain 16 characters.'); } $hex = unpack('H*', $bytes)[1]; // Rearrange the fields to their original order $hex = substr($hex, 8, 4) . substr($hex, 12, 4) . substr($hex, 4, 4) . substr($hex, 0, 4) . substr($hex, 16); return $this->decode($hex); } }