C:/xampp/htdocs/moodle/lib/zend/Zend/Amf/Util/BinaryStream.php

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<?php
class Zend_Amf_Util_BinaryStream
{
    protected $_stream;

    protected $_streamLength;

    protected $_bigEndian;

    protected $_needle;

    public function __construct($stream)
    {
        if (!is_string($stream)) {
            require_once 'Zend/Amf/Exception.php';
            throw new Zend_Amf_Exception('Inputdata is not of type String');
        }

        $this->_stream       = $stream;
        $this->_needle       = 0;
        $this->_streamLength = strlen($stream);
        $this->_bigEndian    = (pack('l', 1) === "\x00\x00\x00\x01");
    }

    public function getStream()
    {
        return $this->_stream;
    }

    public function readBytes($length)
    {
        if (($length + $this->_needle) > $this->_streamLength) {
            require_once 'Zend/Amf/Exception.php';
            throw new Zend_Amf_Exception('Buffer underrun at needle position: ' . $this->_needle . ' while requesting length: ' . $length);
        }
        $bytes = substr($this->_stream, $this->_needle, $length);
        $this->_needle+= $length;
        return $bytes;
    }

    public function writeBytes($bytes)
    {
        $this->_stream.= $bytes;
        return $this;
    }

    public function readByte()
    {
        if (($this->_needle + 1) > $this->_streamLength) {
            require_once 'Zend/Amf/Exception.php';
            throw new Zend_Amf_Exception('Buffer underrun at needle position: ' . $this->_needle . ' while requesting length: ' . $length);
        }

        return ord($this->_stream{$this->_needle++});
    }

    public function writeByte($stream)
    {
        $this->_stream.= pack('c', $stream);
        return $this;
    }

    public function readInt()
    {
        return ($this->readByte() << 8) + $this->readByte();
    }

    public function writeInt($stream)
    {
        $this->_stream.= pack('n', $stream);
        return $this;
    }

    public function readUtf()
    {
        $length = $this->readInt();
        return $this->readBytes($length);
    }

    public function writeUtf($stream)
    {
        $this->writeInt(strlen($stream));
        $this->_stream.= $stream;
        return $this;
    }


    public function readLongUtf()
    {
        $length = $this->readLong();
        return $this->readBytes($length);
    }

    public function writeLongUtf($stream)
    {
        $this->writeLong(strlen($stream));
        $this->_stream.= $stream;
    }

    public function readLong()
    {
        return ($this->readByte() << 24) + ($this->readByte() << 16) + ($this->readByte() << 8) + $this->readByte();
    }

    public function writeLong($stream)
    {
        $this->_stream.= pack('N', $stream);
        return $this;
    }

    public function readUnsignedShort()
    {
        $byte1 = $this->readByte();
        $byte2 = $this->readByte();
        return (($byte1 << 8) | $byte2);
    }

    public function readDouble()
    {
        $bytes = substr($this->_stream, $this->_needle, 8);
        $this->_needle+= 8;

        if (!$this->_bigEndian) {
            $bytes = strrev($bytes);
        }

        $double = unpack('dflt', $bytes);
        return $double['flt'];
    }

    public function writeDouble($stream)
    {
        $stream = pack('d', $stream);
        if (!$this->_bigEndian) {
            $stream = strrev($stream);
        }
        $this->_stream.= $stream;
        return $this;
    }

}