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