mirror of
https://github.com/Yetangitu/ampache
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196 lines
No EOL
8.5 KiB
PHP
196 lines
No EOL
8.5 KiB
PHP
<?php
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// +----------------------------------------------------------------------+
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// | PHP version 5 |
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// +----------------------------------------------------------------------+
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// | Copyright (c) 2002-2006 James Heinrich, Allan Hansen |
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// +----------------------------------------------------------------------+
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// | This source file is subject to version 2 of the GPL license, |
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// | that is bundled with this package in the file license.txt and is |
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// | available through the world-wide-web at the following url: |
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// | http://www.gnu.org/copyleft/gpl.html |
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// +----------------------------------------------------------------------+
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// | getID3() - http://getid3.sourceforge.net or http://www.getid3.org |
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// +----------------------------------------------------------------------+
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// | Authors: James Heinrich <infoØgetid3*org> |
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// | Allan Hansen <ahØartemis*dk> |
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// +----------------------------------------------------------------------+
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// | module.lib.data-hash.php |
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// | getID3() library file. |
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// | dependencies: NONE. |
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// +----------------------------------------------------------------------+
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//
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// $Id: module.lib.data_hash.php,v 1.5 2006/12/03 19:28:18 ah Exp $
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class getid3_lib_data_hash
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{
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private $getid3;
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// constructer - calculate md5/sha1 data
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public function __construct(getID3 $getid3, $algorithm) {
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$this->getid3 = $getid3;
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// Check algorithm
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if (!preg_match('/^(md5|sha1)$/', $algorithm)) {
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throw new getid3_exception('Unsupported algorithm, "'.$algorithm.'", in GetHashdata()');
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}
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//// Handle ogg vorbis files
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if ((@$getid3->info['fileformat'] == 'ogg') && (@$getid3->info['audio']['dataformat'] == 'vorbis')) {
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// We cannot get an identical md5_data value for Ogg files where the comments
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// span more than 1 Ogg page (compared to the same audio data with smaller
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// comments) using the normal getID3() method of MD5'ing the data between the
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// end of the comments and the end of the file (minus any trailing tags),
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// because the page sequence numbers of the pages that the audio data is on
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// do not match. Under normal circumstances, where comments are smaller than
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// the nominal 4-8kB page size, then this is not a problem, but if there are
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// very large comments, the only way around it is to strip off the comment
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// tags with vorbiscomment and MD5 that file.
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// This procedure must be applied to ALL Ogg files, not just the ones with
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// comments larger than 1 page, because the below method simply MD5's the
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// whole file with the comments stripped, not just the portion after the
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// comments block (which is the standard getID3() method.
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// The above-mentioned problem of comments spanning multiple pages and changing
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// page sequence numbers likely happens for OggSpeex and OggFLAC as well, but
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// currently vorbiscomment only works on OggVorbis files.
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if ((bool)ini_get('safe_mode')) {
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throw new getid3_exception('PHP running in Safe Mode - cannot make system call to vorbiscomment[.exe] needed for '.$algorithm.'_data.');
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}
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if (!preg_match('/^Vorbiscomment /', `vorbiscomment --version 2>&1`)) {
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throw new getid3_exception('vorbiscomment[.exe] binary not found in path. UNIX: typically /usr/bin. Windows: typically c:\windows\system32.');
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}
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// Prevent user from aborting script
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$old_abort = ignore_user_abort(true);
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// Create empty file
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$empty = tempnam('*', 'getID3');
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touch($empty);
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// Use vorbiscomment to make temp file without comments
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$temp = tempnam('*', 'getID3');
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$command_line = 'vorbiscomment -w -c '.escapeshellarg($empty).' '.escapeshellarg(realpath($getid3->filename)).' '.escapeshellarg($temp).' 2>&1';
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// Error from vorbiscomment
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if ($vorbis_comment_error = `$command_line`) {
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throw new getid3_exception('System call to vorbiscomment[.exe] failed.');
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}
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// Get hash of newly created file
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$hash_function = $algorithm . '_file';
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$getid3->info[$algorithm.'_data'] = $hash_function($temp);
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// Clean up
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unlink($empty);
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unlink($temp);
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// Reset abort setting
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ignore_user_abort($old_abort);
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// Return success
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return true;
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}
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//// Handle other file formats
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// Get hash from part of file
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if (@$getid3->info['avdataoffset'] || (@$getid3->info['avdataend'] && @$getid3->info['avdataend'] < $getid3->info['filesize'])) {
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if ((bool)ini_get('safe_mode')) {
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$getid3->warning('PHP running in Safe Mode - backtick operator not available, using slower non-system-call '.$algorithm.' algorithm.');
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$hash_function = 'hash_file_partial_safe_mode';
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}
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else {
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$hash_function = 'hash_file_partial';
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}
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$getid3->info[$algorithm.'_data'] = $this->$hash_function($getid3->filename, $getid3->info['avdataoffset'], $getid3->info['avdataend'], $algorithm);
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}
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// Get hash from whole file - use built-in md5_file() and sha1_file()
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else {
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$hash_function = $algorithm . '_file';
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$getid3->info[$algorithm.'_data'] = $hash_function($getid3->filename);
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}
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}
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// Return md5/sha1sum for a file from starting position to absolute end position
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// Using windows system call
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private function hash_file_partial($file, $offset, $end, $algorithm) {
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// It seems that sha1sum.exe for Windows only works on physical files, does not accept piped data
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// Fall back to create-temp-file method:
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if ($algorithm == 'sha1' && strtoupper(substr(PHP_OS, 0, 3)) == 'WIN') {
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return $this->hash_file_partial_safe_mode($file, $offset, $end, $algorithm);
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}
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// Check for presence of binaries and revert to safe mode if not found
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if (!`head --version`) {
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return $this->hash_file_partial_safe_mode($file, $offset, $end, $algorithm);
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}
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if (!`tail --version`) {
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return $this->hash_file_partial_safe_mode($file, $offset, $end, $algorithm);
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}
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if (!`${algorithm}sum --version`) {
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return $this->hash_file_partial_safe_mode($file, $offset, $end, $algorithm);
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}
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$size = $end - $offset;
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$command_line = 'head -c'.$end.' '.escapeshellarg(realpath($file)).' | tail -c'.$size.' | '.$algorithm.'sum';
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return substr(`$command_line`, 0, $algorithm == 'md5' ? 32 : 40);
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}
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// Return md5/sha1sum for a file from starting position to absolute end position
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// Using slow safe_mode temp file
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private function hash_file_partial_safe_mode($file, $offset, $end, $algorithm) {
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// Attempt to create a temporary file in the system temp directory - invalid dirname should force to system temp dir
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if (($data_filename = tempnam('*', 'getID3')) === false) {
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throw new getid3_exception('Unable to create temporary file.');
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}
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// Init
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$result = false;
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// Copy parts of file
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if ($fp = @fopen($file, 'rb')) {
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if ($fp_data = @fopen($data_filename, 'wb')) {
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fseek($fp, $offset, SEEK_SET);
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$bytes_left_to_write = $end - $offset;
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while (($bytes_left_to_write > 0) && ($buffer = fread($fp, getid3::FREAD_BUFFER_SIZE))) {
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$bytes_written = fwrite($fp_data, $buffer, $bytes_left_to_write);
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$bytes_left_to_write -= $bytes_written;
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}
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fclose($fp_data);
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$hash_function = $algorithm . '_file';
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$result = $hash_function($data_filename);
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}
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fclose($fp);
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}
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unlink($data_filename);
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return $result;
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}
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}
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?>
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