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<?php
namespace PhpAmqpLib\Wire;
use PhpAmqpLib\Helper\BigInteger;
abstract class AMQPByteStream
{
public const BIT = 1;
public const OCTET = 1;
public const SHORTSTR = 1;
public const SHORT = 2;
public const LONG = 4;
public const SIGNED_LONG = 4;
public const READ_PHP_INT = 4; // use READ_ to avoid possible clashes with PHP
public const LONGLONG = 8;
public const TIMESTAMP = 8;
/** @var bool */
protected const PLATFORM_64BIT = PHP_INT_SIZE === 8;
/** @var BigInteger[][] */
protected static $bigIntegers = array();
/**
* @var bool
*/
protected static $isLittleEndian;
/**
* Converts byte-string between native and network byte order, in both directions
*
* @param string $bytes
* @return string
*/
protected function correctEndianness($bytes)
{
return self::isLittleEndian() ? $this->convertByteOrder($bytes) : $bytes;
}
/**
* @param string $bytes
* @return string
*/
protected function convertByteOrder($bytes)
{
return strrev($bytes);
}
/**
* @param int $longInt
* @return bool
*/
protected function getLongMSB($longInt)
{
return (bool) ($longInt & 0x80000000);
}
/**
* @param string $bytes
* @return bool
*/
protected function getMSB($bytes)
{
return ord($bytes[0]) > 127;
}
/**
* @return bool
*/
protected static function isLittleEndian()
{
if (self::$isLittleEndian === null) {
$tmp = unpack('S', "\x01\x00"); // to maintain 5.3 compatibility
self::$isLittleEndian = $tmp[1] === 1;
}
return self::$isLittleEndian;
}
/**
* @param string $value
* @param int $base
* @return BigInteger
*/
protected static function getBigInteger($value, $base = 10)
{
if (!isset(self::$bigIntegers[$base])) {
self::$bigIntegers[$base] = array();
}
if (isset(self::$bigIntegers[$base][$value])) {
return self::$bigIntegers[$base][$value];
}
$integer = new BigInteger($value, $base);
self::$bigIntegers[$base][$value] = $integer;
return $integer;
}
}
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