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<?php

namespace bandwidthThrottle\tokenBucket\util;

use bandwidthThrottle\tokenBucket\storage\StorageException;

/**
 * Double packer.
 *
 * @author Markus Malkusch <[email protected]>
 * @link bitcoin:1335STSwu9hST4vcMRppEPgENMHD2r1REK Donations
 * @license WTFPL
 * @internal
 */
final class DoublePacker
{
    
    /**
     * Packs a 64 bit double into an 8 byte string.
     *
     * @param double $double 64 bit double
     * @return string packed 8 byte string representation
     */
    public static function pack($double)
    {
        $string = pack("d", $double);
        assert(8 === strlen($string));
        return $string;
    }
    
    /**
     * Unpacks a 64 bit double from an 8 byte string.
     *
     * @param string $string packed 8 byte string representation.
     * @return double unpacked 64 bit double
     * @throws StorageException conversion error
     */
    public static function unpack($string)
    {
        if (strlen($string) !== 8) {
            throw new StorageException("The string is not 64 bit long.");
        }
        $unpack = unpack("d", $string);
        if (!is_array($unpack) || !array_key_exists(1, $unpack)) {
            throw new StorageException("Could not unpack string.");
        }
        return $unpack[1];
    }
}