AMFStream.php

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<?php

namespace GetId3\Module\AudioVideo;

use GetId3\Lib\Helper;

//  available at http://getid3.sourceforge.net                 //
//            or http://www.getid3.org                         //
//                                                             //
//  AMFStream                                                  //
//  by Seth Kaufman <seth@whirl-i-gig.com>                     //
//                                                             //
//                                                             //
// dependencies: None                                          //
//                                                            ///

class AMFStream
{
    public $bytes;
    public $pos;

    public function __construct(&$bytes)
    {
        $this->bytes = & $bytes;
        $this->pos = 0;
    }

    public function readByte()
    {
        return Helper::BigEndian2Int(substr($this->bytes,
                                                       $this->pos++, 1));
    }

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

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

    public function readDouble()
    {
        return Helper::BigEndian2Float($this->read(8));
    }

    public function readUTF()
    {
        $length = $this->readInt();

        return $this->read($length);
    }

    public function readLongUTF()
    {
        $length = $this->readLong();

        return $this->read($length);
    }

    public function read($length)
    {
        $val = substr($this->bytes, $this->pos, $length);
        $this->pos += $length;

        return $val;
    }

    public function peekByte()
    {
        $pos = $this->pos;
        $val = $this->readByte();
        $this->pos = $pos;

        return $val;
    }

    public function peekInt()
    {
        $pos = $this->pos;
        $val = $this->readInt();
        $this->pos = $pos;

        return $val;
    }

    public function peekLong()
    {
        $pos = $this->pos;
        $val = $this->readLong();
        $this->pos = $pos;

        return $val;
    }

    public function peekDouble()
    {
        $pos = $this->pos;
        $val = $this->readDouble();
        $this->pos = $pos;

        return $val;
    }

    public function peekUTF()
    {
        $pos = $this->pos;
        $val = $this->readUTF();
        $this->pos = $pos;

        return $val;
    }

    public function peekLongUTF()
    {
        $pos = $this->pos;
        $val = $this->readLongUTF();
        $this->pos = $pos;

        return $val;
    }
}