DayZ-Stat-Server/config/SQ_/Buffer.php

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2021-01-31 13:16:02 +01:00
<?php
/**
* @author Pavel Djundik <sourcequery@xpaw.me>
*
* @link https://xpaw.me
* @link https://github.com/xPaw/PHP-Source-Query
*
* @license GNU Lesser General Public License, version 2.1
*
* @internal
*/
namespace xPaw\SourceQuery;
/**
* Class Buffer
*
* @package xPaw\SourceQuery
*/
class Buffer
{
/**
* Buffer
*
* @var string
*/
private $Buffer;
/**
* Buffer length
*
* @var int
*/
private $Length;
/**
* Current position in buffer
*
* @var int
*/
private $Position;
/**
* Sets buffer
*
* @param string $Buffer Buffer
*/
public function Set( $Buffer )
{
$this->Buffer = $Buffer;
$this->Length = StrLen( $Buffer );
$this->Position = 0;
}
/**
* Resets buffer
*/
public function Reset( )
{
$this->Buffer = "";
$this->Length = 0;
$this->Position = 0;
}
/**
* Get remaining bytes
*
* @return int Remaining bytes in buffer
*/
public function Remaining( )
{
return $this->Length - $this->Position;
}
/**
* Gets data from buffer
*
* @param int $Length Bytes to read
*
* @return string
*/
public function Get( $Length = -1 )
{
if( $Length === 0 )
{
return '';
}
$Remaining = $this->Remaining( );
if( $Length === -1 )
{
$Length = $Remaining;
}
else if( $Length > $Remaining )
{
return '';
}
$Data = SubStr( $this->Buffer, $this->Position, $Length );
$this->Position += $Length;
return $Data;
}
/**
* Get byte from buffer
*
* @return int
*/
public function GetByte( )
{
return Ord( $this->Get( 1 ) );
}
/**
* Get short from buffer
*
* @return int
*/
public function GetShort( )
{
$Data = UnPack( 'v', $this->Get( 2 ) );
return $Data[ 1 ];
}
/**
* Get long from buffer
*
* @return int
*/
public function GetLong( )
{
$Data = UnPack( 'l', $this->Get( 4 ) );
return $Data[ 1 ];
}
/**
* Get float from buffer
*
* @return float
*/
public function GetFloat( )
{
$Data = UnPack( 'f', $this->Get( 4 ) );
return $Data[ 1 ];
}
/**
* Get unsigned long from buffer
*
* @return int
*/
public function GetUnsignedLong( )
{
$Data = UnPack( 'V', $this->Get( 4 ) );
return $Data[ 1 ];
}
/**
* Read one string from buffer ending with null byte
*
* @return string
*/
public function GetString( )
{
$ZeroBytePosition = StrPos( $this->Buffer, "\0", $this->Position );
if( $ZeroBytePosition === false )
{
$String = "";
}
else
{
$String = $this->Get( $ZeroBytePosition - $this->Position );
$this->Position++;
}
return $String;
}
}