PHP读取FLASH 文件信息

<?php
/*
示例：
  $file = '/data/ad_files/5/5.swf';
  $flash = new FLASH();
  $flash = $flash->getSwfInfo($file);
  echo "
文件的宽高是:".$flash["width"].":".$info["height"];
  echo "
文件版本是".$flash["version"];
  echo "
文件帧数量是".$flash["frameCount"];
  echo "
文件帧速率是".$flash["frameRate"];
  echo "
文件背景颜色是".$flash["bgColor"];
*/
class FLASH
{
  //是否返回背景色
  public $need_back_color = false ;
  
  //是否返回版本
  public $need_version = false ;
  
  //是否返回帧速率
  public $need_frameRate = false ;
  
  //是否返回帧数量
  public $need_frameCount = false ;

  public function __construct() 
  {

  }

  public function getSwfInfo( $filename )
  {
    if ( file_exists($filename) ) {
       //echo "文件的修改时间:".date("M d Y H:i:s.", filemtime($filename))."
";
    } else {
       //echo "目标文件不存在!";
       return array( "error" => $filename ) ;
    }

    //打开文件
    $rs = fopen($filename,"r");
    
    //读取文件的数据
    $str = fread( $rs , filesize( $filename ) ) ;
    ///
    if($str[0] == "F")
    {
       //echo "
文件已是解压缩的文件:";
    } else {
       $first = substr($str,0,8);
       $last = substr($str,8);
       //
       $last = gzuncompress($last);
       //
       $str = $first . $last ;
       $str[0] = "F";
       //echo "
解压缩后的文件信息:";
    }

    $info = $this->getInfo( $str );
    fclose ( $rs ) ;
    return $info;
  }

  private function mydecbin($str,$index)
  {
    $fbin = decbin(ord($str[$index]));
    while(strlen($fbin)<8)$fbin="0".$fbin;
    return $fbin;
  }

  private function colorhex($data)
  {
    $tmp = dechex($data);
    if ( strlen($tmp)<2 ) {
      $tmp='0' . $tmp ;
    }
    return $tmp;
  }

  private function getInfo( $str )
  {
    //换算成二进制
    $fbin = $this->mydecbin( $str , 8 ) ;
    
    //计算rec的单位长度
    $slen = bindec( substr( $fbin , 0 , 5 ) );
    
    //计算rec所在的字节
    $recsize = $slen * 4 + 5 ;
    $recsize = ceil( $recsize / 8 ) ;

    //rec的二进制
    $recbin = $fbin ;
    for( $i = 9 ; $i < $recsize + 8 ; $i++ )
    {
       $recbin .= $this->mydecbin( $str ,$i );
    }

    //rec数据
    $rec = array();
    for( $i = 0 ; $i < 4 ; $i++ )
    {
       $rec[] = bindec( substr( $recbin , 5 + $i * $slen , $slen ) ) / 20 ;
    }
    
    if ( $this->need_back_color ) {
      //背景颜色
      for( $i = $recsize + 12 ; $i < strlen ( $str ) ; $i ++ )
      {
         if ( ord( $str[$i] ) == 67 && ord( $str[$i+1] ) == 2 )
         {
          $bgcolor = $this->colorhex(ord($str[$i+2])).$this->colorhex(ord($str[$i+3])).$this->colorhex(ord($str[$i+4]));
          break;
         }
      }
    }
    
    if ( $this->need_version ) {
      //版本
      $version = ord( $str[3] );
    }
    if ( $this->need_frameRate ) {
      //帧速率
      $frameRate = ord( $str[$recsize + 8] ) / 256 + ord( $str[$recsize + 9] ) ;
    }

    if ( $this->need_frameCount ) {    
      //帧数量
      $frameCount = ord( $str[$recsize + 11] ) * 256 + ord( $str[$recsize + 10] );
    }
    
    return  array ( "bgColor" => $bgcolor ,
            "version" => $version , 
            "frameRate" => $frameRate , 
            "frameCount" => $frameCount , 
            'width'=>$rec[1],
            'height'=>$rec[3]
            );
  }
}

?>