class.file.php

使用PHP+MySQL编写的一个图片上传共享系统.

<?
/*

	File 1.0 - A wrapper class to common PHP file operations
	Copyright (c) 1999 CDI, [e-mail]
	All Rights Reserved

*/

Class File
{
	var $ERROR = "";
	var $BUFFER = -1;
	var $STATCACHE = array();
	var $TEMPDIR = '/tmp';
	var $REALUID = -1;
	var $REALGID = -1;

	function File ()
	{
		global $php_errormsg;
		return;
	}

	function clear_cache()
	{
		unset($this->STATCACHE);
		$this->STATCACHE = array();
		return true;
	}

	function is_sane($fileName = "", $must_exist = 0, $noSymLinks = 0, $noDirs = 0)
	{
		$exists = false;

		if(empty($fileName)) {	return false; }
		if($must_exist != 0)
		{
			if(!file_exists($fileName))
			{
				$this->ERROR = "is_sane: [$fileName] does not exist";
				return false;
			}
			$exists = true;
		}
		if($exists)
		{
			if(!is_readable($fileName))
			{
				$this->ERROR = "is_sane: [$fileName] not readable";
				return false;
			}

			if($noDirs != 0)
			{
				if(is_dir($fileName))
				{
					$this->ERROR = "is_sane: [$fileName] is a directory";
					return false;
				}
			}

			if($noSymLinks != 0)
			{
				if(is_link($fileName))
				{
					$this->ERROR = "is_sane: [$fileName] is a symlink";
					return false;
				}
			}

		} // end if exists

		return true;		
	}


//	**************************************************************

	function read_file ($fileName = "" )
	{
		$contents = "";

		if(empty($fileName))
		{
			$this->ERROR = "read_file: No file specified"; 
			return false;
		}
		if(!$this->is_sane($fileName,1,0,1))
		{
			// Preserve the is_sane() error msg
			return false;
		}
		$fd = @fopen($fileName,"r");

		if( (!$fd) || (empty($fd)) )
		{
			$this->ERROR = "read_file: File error: [$php_errormsg]";
			return false;
		}

		$contents = fread($fd, filesize($fileName) );

		fclose($fd);

        return $contents;
	}

//	**************************************************************
//	Read a file via fgetss(), which strips all php/html
//	from the file.

	function strip_read ($fileName = "", $strip_cr = 0)
	{
		if(empty($fileName))
		{
			$this->ERROR = "strip_read: No file specified"; 
			return false;
		}
		if(!$this->is_sane($fileName,1,0,1))
		{
			// Preserve the error
			return false;
		}
		if($this->BUFFER > 0)
		{
			$buffer = $this->BUFFER;
		} else {
			$buffer = filesize($fileName);
		}

		$contents = "";

		$fd = @fopen($fileName,"r");

		if( (!$fd) || (empty($fd)) )
		{
			$this->ERROR = "strip_read: File error: [$php_errormsg]";
			return false;
		}
		while(!feof($fd))
		{
			$contents .= fgetss($fd,$buffer);
		}
		fclose($fd);
        return $contents;
	}

//	**************************************************************
	function write_file ($fileName,$Data)
	{
		$tempDir = $this->TEMPDIR;
		$tempfile   = tempnam( $tempDir, "cdi" );

		if(!$this->is_sane($fileName,0,1,1))
		{
			return false;
		}

		if (file_exists($fileName))
		{
			if (!copy($fileName, $tempfile))
			{
				$this->ERROR = "write_file: cannot create backup file [$tempfile] :  [$php_errormsg]";
				return false;
			}
		}

		$fd = @fopen( $tempfile, "a" );

		if( (!$fd) or (empty($fd)) )
		{
			$myerror = $php_errormsg;
			unlink($tempfile);
			$this->ERROR = "write_file: [$tempfile] access error [$myerror]";
			return false;
		}

		fwrite($fd, $Data);

		fclose($fd);

		if (!copy($tempfile, $fileName))
		{
			$myerror = $php_errormsg;   // Stash the error, see above
			unlink($tempfile);
			$this->ERROR = "write_file: Cannot copy file [$fileName] [$myerror]";
			return false;
		}

		unlink($tempfile);

		if(file_exists($tempfile))
		{
			// Not fatal but it should be noted
			$this->ERROR = "write_file: Could not unlink [$tempfile] : [$php_errormsg]";
		}
		return true;
	}

//	**************************************************************
	function copy_file ($oldFile = "", $newFile = "")
	{
		if(empty($oldFile))
		{
			$this->ERROR = "copy_file: oldFile not specified";
			return false;
		}
		if(empty($newFile))
		{
			$this->ERROR = "copy_file: newFile not specified";
			return false;
		}
		if(!$this->is_sane($oldFile,1,0,1))
		{
			// preserve the error
			return false;
		}
		if(!$this->is_sane($newFile,0,1,1))
		{
			// preserve it
			return false;
		}

		if (! (@copy($oldFile, $newFile)))
		{
			$this->ERROR = "copy_file: cannot copy file [$oldFile] [$php_errormsg]";
			return false;
		}

		return true;
	}

//	**********************************************

	function get_files ($root_dir, $fileExt = 'ALL_FILES')
	{
		$fileList = array();

		if(!is_dir($root_dir))
		{
			$this->ERROR = "get_files: Sorry, [$root_dir] is not a directory";
			return false;
		}

		if(empty($fileExt))
		{
			$this->ERROR = "get_files: No file extensions specified";
			return false;
		}

		$open_dir = @opendir($root_dir);

		if( (!$open_dir) or (empty($open_dir)) )
		{
			$this->ERROR = "get_files: Failed to open dir [$root_dir] : $php_errormsg";
			return false;
		}

		$fileCount = 0;

		while ( $file = readdir($open_dir))
		{
			if( (!is_dir($file)) and (!empty($file)) )
			{
				if($fileExt == 'ALL_FILES')
				{
					$fileList[$fileCount] = $file;
					$fileCount++;
				}
				else
				{
					if(eregi(".\.($fileExt)$",$file))
					{
						$fileList[$fileCount] = $file;
						$fileCount++;
					}
				}
			}
		}

		closedir($open_dir);
		return $fileList;

	}	// end get_files

	function is_owner($fileName, $uid = "")
	{
		if(empty($uid))
		{
			if($this->REALUID < 0)
			{
				$tempDir = $this->TEMPDIR;
				$tempFile = tempnam($tempDir,"cdi");
				if(!touch($tempFile))
				{
					$this->ERROR = "is_owner: Unable to create [$tempFile]";
					return false;
				}
				$stats = stat($tempFile);
				unlink($tempFile);
				$uid = $stats[4];
			}
			else
			{
				$uid = $this->REALUID;
			}
		}
		$fileStats = stat($fileName);
		if( (empty($fileStats)) or (!$fileStats) )
		{
			$this->ERROR = "is_owner: Unable to stat [$fileName]";
			return false;
		}

		$this->STATCACHE = $fileStats;

		$owner = $fileStats[4];
		if($owner == $uid)
		{
			return true;
		}

		$this->ERROR = "is_owner: Owner [$owner] Uid [$uid] FAILED";
		return false;
	}

	function is_inGroup($fileName, $gid = "")
	{
		if(empty($gid))
		{
			if($this->REALGID < 0)
			{
				$tempDir = $this->TEMPDIR;
				$tempFile = tempnam($tempDir,"cdi");
				if(!touch($tempFile))
				{
					$this->ERROR = "is_inGroup: Unable to create [$tempFile]";
					return false;
				}
				$stats = stat($tempFile);
				unlink($tempFile);
				$gid = $stats[5];
			}
			else
			{
				$gid = $this->REALGID;
			}
		}
		$fileStats = stat($fileName);
		if( (empty($fileStats)) or (!$fileStats) )
		{
			$this->ERROR = "is_inGroup: Unable to stat [$fileName]";
			return false;
		}

		$this->STATCACHE = $fileStats;

		$group = $fileStats[5];
		if($group == $gid)
		{
			return true;
		}

		$this->ERROR = "is_inGroup: Group [$group] Gid [$gid] FAILED";
		return false;
	}

	function get_real_uid()
	{
		$tempDir = $this->TEMPDIR;
		$tempFile = tempnam($tempDir,"cdi");
		if(!touch($tempFile))
		{
			$this->ERROR = "is_owner: Unable to create [$tempFile]";
			return false;
		}
		$stats = stat($tempFile);
		unlink($tempFile);
		$uid = $stats[4];
		$gid = $stats[5];
		$this->REALUID = $uid;
		$this->REALGID = $gid;
		return $uid;
	}

	function get_real_gid()
	{
		$uid = $this->get_real_uid();
		if( (!$uid) or (empty($uid)) )
		{
			return false;
		}
		return $this->REALGID;
	}

}	// end class File

?>