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<?php
//-----------------------------------------------------------------------------
// SWF HEADER - version 1.0
// Small utility class to determine basic data from a SWF file header
// Does not need any php-flash extension, based on raw binary data reading
//-----------------------------------------------------------------------------
// SWFHEADER CLASS - PHP SWF header parser
// Copyright (C) 2004 Carlos Falo Hervás
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; either
// version 2.1 of the License, or (at your option) any later version.
//-----------------------------------------------------------------------------
//
//VGR09062006 MOD function name & returned value of loadswf()
// version 1.0.1
//
// TODO : Nil
//
class swfheader {
var $debug ; // Output DEBUG info
var $fname ; // SWF file analyzed
var $magic ; // Magic in a SWF file (FWS or CWS)
var $compressed ; // Flag to indicate a compressed file (CWS)
var $version ; // Flash version
var $size ; // Uncompressed file size (in bytes)
var $width ; // Flash movie native width
var $height ; // Flash movie native height
var $valid ; // Valid SWF file
var $fps ; // Flash movie native frame-rate
var $frames ; // Flash movie total frames
//---------------------------------------------------------------------------
// swfheader($debug) : Constructor, basically does nothing but initilize
// debug and data fields
//---------------------------------------------------------------------------
function swfheader($debug = false) {
$this->debug = false ;
$this->init() ;
}
//---------------------------------------------------------------------------
// init() : initialize the data fields to "empty" values
//---------------------------------------------------------------------------
function init() {
$this->valid = false ;
$this->fname = "" ;
$this->magic = "" ;
$this->compressed = false ;
$this->version = 0 ;
$this->width = 0 ;
$this->height = 0 ;
$this->size = 0 ;
$this->frames = 0 ;
$this->fps[] = Array() ;
}
//---------------------------------------------------------------------------
// loadswf($filename) : loads $filename and stores data from it's header
//---------------------------------------------------------------------------
//VGR09062006 MOD function name & returned value
//
function getDimensions($filename) { // returns String ; object has been updated
$this->fname = $filename ;
$fp = @fopen($filename,"rb") ;
if ($fp) {
$this->magic = fread($fp,3) ;
if ($this->magic!="FWS" && $this->magic!="CWS") {
$this->valid = 0 ;
} else {
// Compression
if (substr($this->magic,0,1)=="C") $this->compressed = true ;
else $this->compressed = false ;
// version
$this->version = ord(fread($fp,1)) ;
// Size
$lg = 0 ;
// 4 LSB-MSB
for ($i=0;$i<4;$i++) {
$t = ord(fread($fp,1)) ;
$lg += ($t<<(8*$i)) ;
}
$this->size = $lg ;
// RECT... we will "simulate" a stream from now on... read remaining file
$buffer = fread($fp,$this->size) ;
if ($this->compressed) {
// First decompress GZ stream
$buffer = gzuncompress($buffer,$this->size) ;
}
$b = ord(substr($buffer,0,1)) ;
$buffer = substr($buffer,1) ;
$cbyte = $b ;
$bits = $b>>3 ;
$cval = "" ;
// Current byte
$cbyte &= 7 ;
$cbyte<<= 5 ;
// Current bit (first byte starts off already shifted)
$cbit = 2 ;
// Must get all 4 values in the RECT
for ($vals=0;$vals<4;$vals++) {
$bitcount = 0 ;
while ($bitcount<$bits) {
if ($cbyte&128) {
$cval .= "1" ;
} else {
$cval.="0" ;
}
$cbyte<<=1 ;
$cbyte &= 255 ;
$cbit-- ;
$bitcount++ ;
// We will be needing a new byte if we run out of bits
if ($cbit<0) {
$cbyte = ord(substr($buffer,0,1)) ;
$buffer = substr($buffer,1) ;
$cbit = 7 ;
}
}
// O.k. full value stored... calculate
$c = 1 ;
$val = 0 ;
// Reverse string to allow for SUM(2^n*$atom)
$tval = strrev($cval) ;
for ($n=0;$n<strlen($tval);$n++) {
$atom = substr($tval,$n,1) ;
if ($atom=="1") $val+=$c ;
// 2^n
$c*=2 ;
}
// TWIPS to PIXELS
$val/=20 ;
switch ($vals) {
case 0:
// tmp value
$this->width = $val ;
break ;
case 1:
$this->width = $val - $this->width ;
break ;
case 2:
// tmp value
$this->height = $val ;
break ;
case 3:
$this->height = $val - $this->height ;
break ;
}
$cval = "" ;
}
// Frame rate
$this->fps = Array() ;
for ($i=0;$i<2;$i++) {
$t = ord(substr($buffer,0,1)) ;
$buffer = substr($buffer,1) ;
$this->fps[] = $t ;
}
// Frames
$this->frames = 0 ;
for ($i=0;$i<2;$i++) {
$t = ord(substr($buffer,0,1)) ;
$buffer = substr($buffer,1) ;
$this->frames += ($t<<(8*$i)) ;
}
fclose($fp) ;
$this->valid = 1 ;
}
} else {
$this->valid = 0 ;
}
if ($this->valid) {
$this_width = $this->width;
$this_height = $this->height;
$swf_dimensions=$this->width."|".$this->height;
return $swf_dimensions;
}
}
}
?>