- /* 通过文件名,获得文件类型*
- * @author chengmo*
- * @version 0.1
- * $filename="d:/1.png";echo cFileTypeCheck::getFileType($filename); 打印:png
- * edit bbs.it-home.org
- */
- class cFileTypeCheck
- {
- private static $_TypeList=array();
- private static $CheckClass=null;
- private function __construct($filename)
- {
- self::$_TypeList=$this->getTypeList();
- }
- /**
- *处理文件类型映射关系表*
- *
- * @param string $filename 文件类型
- * @return string 文件类型,没有找到返回:other
- */
- private function _getFileType($filename)
- {
- $filetype="other";
- if(!file_exists($filename)) throw new Exception("no found file!");
- $file = @fopen($filename,"rb");
- if(!$file) throw new Exception("file refuse!");
- $bin = fread($file, 15); //只读15字节 各个不同文件类型,头信息不一样。
- fclose($file);
- $typelist=self::$_TypeList;
- foreach ($typelist as $v)
- {
- $blen=strlen(pack("H*",$v[0])); //得到文件头标记字节数
- $tbin=substr($bin,0,intval($blen)); ///需要比较文件头长度
- if(strtolower($v[0])==strtolower(array_shift(unpack("H*",$tbin))))
- {
- return $v[1];
- }
- }
- return $filetype;
- }
- /**
- *得到文件头与文件类型映射表*
- *
- * @return array array(array(key,value)...)
- */
- public function getTypeList()
- {
- return array(array("FFD8FFE1","jpg"),
- array("89504E47","png"),
- array("47494638","gif"),
- array("49492A00","tif"),
- array("424D","bmp"),
- array("41433130","dwg"),
- array("38425053","psd"),
- array("7B5C727466","rtf"),
- array("3C3F786D6C","xml"),
- array("68746D6C3E","html"),
- array("44656C69766572792D646174","eml"),
- array("CFAD12FEC5FD746F","dbx"),
- array("2142444E","pst"),
- array("D0CF11E0","xls/doc"),
- array("5374616E64617264204A","mdb"),
- array("FF575043","wpd"),
- array("252150532D41646F6265","eps/ps"),
- array("255044462D312E","pdf"),
- array("E3828596","pwl"),
- array("504B0304","zip"),
- array("52617221","rar"),
- array("57415645","wav"),
- array("41564920","avi"),
- array("2E7261FD","ram"),
- array("2E524D46","rm"),
- array("000001BA","mpg"),
- array("000001B3","mpg"),
- array("6D6F6F76","mov"),
- array("3026B2758E66CF11","asf"),
- array("4D546864","mid"));
- }
- public static function getFileType($filename)
- {
- if(!self::$CheckClass) self::$CheckClass=new self($filename);
- $class=self::$CheckClass;
- return $class->_getFileType($filename);
- }
- }
- ?>
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