176 lines
4 KiB
PHP
176 lines
4 KiB
PHP
<?php defined('SYSPATH') OR die('No direct access allowed.');
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/**
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* File helper class.
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*
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* @package Core
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* @author Kohana Team
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* @copyright (c) 2007-2009 Kohana Team
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* @license http://kohanaphp.com/license.html
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*/
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class file_Core {
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/**
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* Attempt to get the mime type from a file. This method is horribly
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* unreliable, due to PHP being horribly unreliable when it comes to
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* determining the mime-type of a file.
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*
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* @param string filename
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* @return string mime-type, if found
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* @return boolean FALSE, if not found
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*/
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public static function mime($filename)
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{
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// Make sure the file is readable
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if ( ! (is_file($filename) AND is_readable($filename)))
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return FALSE;
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// Get the extension from the filename
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$extension = strtolower(substr(strrchr($filename, '.'), 1));
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if (preg_match('/^(?:jpe?g|png|[gt]if|bmp|swf)$/', $extension))
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{
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// Disable error reporting
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$ER = error_reporting(0);
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// Use getimagesize() to find the mime type on images
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$mime = getimagesize($filename);
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// Turn error reporting back on
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error_reporting($ER);
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// Return the mime type
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if (isset($mime['mime']))
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return $mime['mime'];
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}
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if (function_exists('finfo_open'))
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{
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// Use the fileinfo extension
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$finfo = finfo_open(FILEINFO_MIME);
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$mime = finfo_file($finfo, $filename);
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finfo_close($finfo);
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// Return the mime type
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return $mime;
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}
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if (ini_get('mime_magic.magicfile') AND function_exists('mime_content_type'))
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{
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// Return the mime type using mime_content_type
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return mime_content_type($filename);
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}
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if ( ! KOHANA_IS_WIN)
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{
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// Attempt to locate use the file command, checking the return value
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if ($command = trim(exec('which file', $output, $return)) AND $return === 0)
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{
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return trim(exec($command.' -bi '.escapeshellarg($filename)));
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}
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}
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if ( ! empty($extension) AND is_array($mime = Kohana::config('mimes.'.$extension)))
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{
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// Return the mime-type guess, based on the extension
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return $mime[0];
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}
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// Unable to find the mime-type
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return FALSE;
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}
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/**
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* Split a file into pieces matching a specific size.
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*
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* @param string file to be split
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* @param string directory to output to, defaults to the same directory as the file
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* @param integer size, in MB, for each piece to be
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* @return integer The number of pieces that were created.
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*/
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public static function split($filename, $piece_size = 10)
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{
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// Open the input file
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$file = fopen($filename, 'rb');
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// Change the piece size to bytes
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$piece_size = floor($piece_size * 1024 * 1024);
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// Write files in 8k blocks
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$block_size = 1024 * 8;
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// Total number of peices
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$peices = 0;
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while ( ! feof($file))
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{
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// Create another piece
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$peices += 1;
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// Create a new file piece
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$piece = str_pad($peices, 3, '0', STR_PAD_LEFT);
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$piece = fopen($filename.'.'.$piece, 'wb+');
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// Number of bytes read
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$read = 0;
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do
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{
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// Transfer the data in blocks
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fwrite($piece, fread($file, $block_size));
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// Another block has been read
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$read += $block_size;
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}
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while ($read < $piece_size);
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// Close the piece
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fclose($piece);
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}
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// Close the file
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fclose($file);
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return $peices;
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}
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/**
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* Join a split file into a whole file.
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*
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* @param string split filename, without .000 extension
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* @param string output filename, if different then an the filename
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* @return integer The number of pieces that were joined.
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*/
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public static function join($filename)
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{
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// Open the file
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$file = fopen($filename, 'wb+');
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// Read files in 8k blocks
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$block_size = 1024 * 8;
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// Total number of peices
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$pieces = 0;
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while (is_file($piece = $filename.'.'.str_pad($pieces + 1, 3, '0', STR_PAD_LEFT)))
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{
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// Read another piece
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$pieces += 1;
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// Open the piece for reading
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$piece = fopen($piece, 'rb');
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while ( ! feof($piece))
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{
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// Transfer the data in blocks
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fwrite($file, fread($piece, $block_size));
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}
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// Close the peice
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fclose($piece);
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}
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return $pieces;
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}
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} // End file
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