support/FileReader.php

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<?php
require_once(dirname(__FILE__).'/IReader.php');

class FileReader implements IReader {


    private $fp;

    

    public function FileReader($filename)
    {
        if(!file_exists($filename))
            throw new Exception("File does not exist: ".$filename);
        if(!is_file($filename))
            throw new Exception("Target is not a file.");
        if(!is_readable($filename))
            throw new Exception("File exists, but is not readable.");

        $this->fp = fopen($filename, 'rb');
    }

    public function Read($count)
    {
        if($count > 0) {
            return fread($this->fp, $count);
        }
        return '';
    }

    public function ReadInt($count)
    {
        $int = 0;
        for($x = 0; $x < $count; $x++)
        {
            $buffer = (ord(fgetc($this->fp)) << ($x * 8));
            if($buffer === false)
                throw new Exception("Read failure");
            $int += $buffer;
        }
        return $int;
    }

    public function GetPosition()
    {
        return ftell($this->fp);
    }

    public function GetSubString($start,$length = FALSE)
    {
        $oldpos = ftell($this->fp);
        fseek($this->fp,$start);
        $data = '';
        if($length === false) {
            while($newdata = $this->Read(4096)) {
                if(strlen($newdata) == 0) {
                    break;
                }
                $data .= $newdata;
            }
        } else {
            $data = fread($this->fp,$length);
        }
        fseek($this->fp,$oldpos);
        return $data;
    }
    public function ReadCString() {
        $string = '';
        while(($char = $this->Read(1)) !== false) {
            if(ord($char) == 0) {
                break;
            }
            $string.=$char;
        }
        return $string;
    }
    public function Seek($position)
    {
        fseek($this->fp, $position);
    }

    public function Skip($count)
    {
        fseek($this->fp, $count, SEEK_CUR);
    }
}
?>