Snippets File Management
File Management
SWF head reader
by: Alessandro Crugnola
|
February 24, 2004
Version: 1.0
Type: Class
Category: File Management
License: GNU General Public License
Description: Get the SWF file informations from a given file string resource. It returns: - compression method - file type - SWF version - frame rate - frame count - width - height
<?php
/**
* Flash Header reader
* Alessandro Crugnola (sephiroth)
* alessandro@sephiroth.it
* http://www.sephiroth.it
*
* Read the SWF header informations and return an
* associative array with the property of the SWF File
*
* @param input string file
* @returns array
*
*
* **** HOW TO USE *****
* -------------------------------------
* $f = new FlashHeader("flash.swf");
* $result = $f->getimagesize();
* print_r($result);
* -------------------------------------
*
*/
class FlashHeader{
var $version;
var $filetype;
var $bitpos;
var $cur;
var $pos;
var $rect;
var $framerate;
var $length;
var $compression = 0;
var $point = 0;
var $isValid = 0;
/**
* @method FlashHeader
* @type constructor
* @param string file
*/
function FlashHeader($buffer){
$this->buffer = $buffer;
$fp = @fopen($this->buffer,"rb");
$head = @fread($fp, 3);
if($head == "CWS"){
/* zlib */
fseek($fp,0);
$data = fread($fp,8);
$_data = gzuncompress(fread($fp, filesize($buffer)));
$data = $data . $_data;
$this->data = $data;
$this->compression = 1;
$this->isValid = 1;
} else if ($head == "FWS"){
fseek($fp,0);
$this->data = fread($fp, filesize($buffer));
$this->isValid = 1;
} else {
$this->isValid = 0;
}
@fclose($fp);
}
/**
* @method getimagesize
* @type public
* @description read the file informations
*/
function getimagesize(){
if(!$this->isValid){
return false;
}
$this->filetype = $this->read(3);
$this->version = $this->readbyte();
$l = $this->read(4);
$this->filelength = filesize($this->buffer);
$this->rect = $this->readRect();
$this->framerate = unpack('vrate',$this->read(2));
$this->framerate = $this->framerate['rate']/256;
$this->framecount = $this->readshort();
return array(
"zlib-compression"=> $this->compression,
"fileType" => $this->filetype,
"version" => $this->version,
"fileSize" => $this->filelength,
"frameRate" => $this->framerate,
"frameCount" => $this->framecount,
"movieSize" => $this->rect
);
}
/* read */
function read($n){
$ret = substr($this->data, $this->point, $this->point + $n);
$this->point += $n;
return $ret;
}
/* read short */
function readshort(){
$pack = unpack('vshort',$this->read(2));
return $pack['short'];
}
/* read byte */
function readByte(){
$ret = unpack("Cbyte",$this->read(1));
return $ret['byte'];
}
/* read Rect */
function readRect(){
$this->begin();
$l = $this->readbits(5);
$xmin = $this->readbits($l)/20;
$xmax = $this->readbits($l)/20;
$ymin = $this->readbits($l)/20;
$ymax = $this->readbits($l)/20;
$rect = new Rect($xmax, $ymax);
return $rect->__str__();
}
/* incpos */
function incpos(){
$this->pos += 1;
if($this->pos>8){
$this->pos = 1;
$this->cur = $this->readbyte();
}
}
/* readbits */
function readbits($nbits){
$n = 0;
$r = 0;
while($n < $nbits){
$r = ($r<<1) + $this->getbits($this->pos);
$this->incpos();
$n += 1;
}
return $r;
}
/* getbits */
function getbits($n){
return ($this->cur>>(8-$n))&1;
}
/* begin */
function begin(){
$this->cur = $this->readbyte();
$this->pos = 1;
}
}
/**
* class Rect
* store the size values into an associative array
*/
class Rect{
function Rect($x2,$y2){
$this->xmax = $x2;
$this->ymax = $y2;
$this->value = $this->__str__();
}
function __str__(){
$ret = array($this->xmax, $this->ymax);
$ret["width"] = $this->xmax;
$ret["height"] = $this->ymax;
return $ret;
}
}
/* end */
?>
PHPBuilder
Policies
PHP Developer
Topics
PHP Developer
Resources
PHP Developer
References
