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<?php
/**
* Description of FileObject
*
* @author Sander
*/
abstract class FileObject {
private $byteLength = -1;
public function __construct($byteLength = -1){
$this->byteLength = $byteLength;
}
public function getByteLength(){
if($this->byteLength >= 0){
return $this->byteLength;
}
return $this->getLength();
}
public function getLength(){
throw new Exception("Sub-class needs to implement this if it doesn't have a fixed length");
}
/**
* Convert a string to byte format (maximum 4 bytes)
* @param string $string Input string
* @return int Output integer
*/
public function toInt($string){
$out = 0;
for($i = 0, $len = min(4, strlen($string)); $i < $len; $i++){
$out = $out | (ord($string[$i]) << (($len-$i-1)*8));
}
return $out;
}
/**
* Convert a byte (stored in an integer) to a string
* @param byte $int
* @return string
*/
public function byteToString($int){
return $this->toString($int, 1);
}
/**
* Convert a byte (stored in an integer) to a string
* @param byte $int
* @return string
*/
public function byteAsString($int){
return $this->asString($int, 1);
}
/**
* Convert a short (stored in an integer) to a string
* @param short $int
* @return string
*/
public function shortToString($int){
return $this->toString($int, 2);
}
/**
* Convert a short (stored in an integer) to a string
* @param short $int
* @return string
*/
public function shortAsString($int){
return $this->asString($int, 2);
}
/**
* Convert a tri-byte (stored in an integer) to a string
* @param tri-byte $int
* @return string
*/
public function triToString($int){
return $this->toString($int, 3);
}
/**
* Convert a tri-byte (stored in an integer) to a string
* @param tri-byte $int
* @return string
*/
public function triAsString($int){
return $this->asString($int, 3);
}
/**
* Convert an integer to a string
* @param int $int
* @return string
*/
public function intToString($int){
return $this->toString($int, 4);
}
/**
* Convert an integer to a string
* @param int $int
* @return string
*/
public function intAsString($int){
return $this->asString($int, 4);
}
/**
* Convert a number of n bytes to a string
* @param int $int Number that should be converted
* @param int $size Number of bytes to convert
* @return string Output string
*/
private function toString($int, $size){
$out = "";
for($i = 0; $i < $size; $i++){
$out = chr($int & 0xFF).$out;
$int = $int >> 8;
}
return $out;
}
/**
* Convert a number of n bytes to a string
* @param int $int Number that should be converted
* @param int $size Number of bytes to convert
* @return string Output string
*/
private function asString($int, $size){
$out = "";
for($i = 0; $i < $size; $i++){
if($i > 0) $out = " ".$out;
$byte = dechex($int & 0xFF);
if(strlen($byte) == 1) $byte = "0".$byte;
$out = $byte.$out;
$int = $int >> 8;
}
return $out;
}
/**
* Get the value
* @return mixed Value to get
*/
abstract public function get();
/**
* Set the value
* @return mixed Value to set
*/
abstract public function set($value);
/**
* Serialize the object
* @return string String representation
*/
abstract public function serialize();
/**
* Unserialize the object
* @param string $data String representation
*/
abstract public function unserialize($data);
}
?>
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