mirror of
https://git.code.sf.net/p/seeddms/code
synced 2024-10-17 05:22:23 +00:00
121 lines
2.9 KiB
PHP
121 lines
2.9 KiB
PHP
<?php
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/**
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* Implementation of preview base
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*
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* @category DMS
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* @package SeedDMS_Preview
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* @license GPL 2
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* @version @version@
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* @author Uwe Steinmann <uwe@steinmann.cx>
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* @copyright Copyright (C) 2010, Uwe Steinmann
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* @version Release: @package_version@
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*/
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/**
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* Class for managing creation of preview images for documents.
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*
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* @category DMS
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* @package SeedDMS_Preview
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* @version @version@
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* @author Uwe Steinmann <uwe@steinmann.cx>
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* @copyright Copyright (C) 2011, Uwe Steinmann
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* @version Release: @package_version@
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*/
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class SeedDMS_Preview_Base {
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/**
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* @var string $cacheDir location in the file system where all the
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* cached data like thumbnails are located. This should be an
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* absolute path.
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* @access public
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*/
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public $previewDir;
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/**
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* @var array $converters list of mimetypes and commands for converting
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* file into preview image
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* @access protected
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*/
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protected $converters;
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/**
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* @var integer $timeout maximum time for execution of external commands
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* @access protected
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*/
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protected $timeout;
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function __construct($previewDir, $timeout=5) { /* {{{ */
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if(!is_dir($previewDir)) {
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if (!SeedDMS_Core_File::makeDir($previewDir)) {
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$this->previewDir = '';
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} else {
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$this->previewDir = $previewDir;
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}
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} else {
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$this->previewDir = $previewDir;
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}
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$this->timeout = intval($timeout);
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} /* }}} */
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static function execWithTimeout($cmd, $timeout=5) { /* {{{ */
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$descriptorspec = array(
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0 => array("pipe", "r"),
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1 => array("pipe", "w"),
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2 => array("pipe", "w")
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);
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$pipes = array();
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$timeout += time();
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$process = proc_open($cmd, $descriptorspec, $pipes);
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if (!is_resource($process)) {
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throw new Exception("proc_open failed on: " . $cmd);
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}
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$output = '';
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$timeleft = $timeout - time();
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$read = array($pipes[1]);
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$write = NULL;
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$exeptions = NULL;
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do {
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stream_select($read, $write, $exeptions, $timeleft, 200000);
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if (!empty($read)) {
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$output .= fread($pipes[1], 8192);
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}
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$timeleft = $timeout - time();
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} while (!feof($pipes[1]) && $timeleft > 0);
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if ($timeleft <= 0) {
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proc_terminate($process);
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throw new Exception("command timeout on: " . $cmd);
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} else {
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return $output;
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}
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} /* }}} */
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/**
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* Set a list of converters
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*
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* Merges the list of passed converters with the already existing ones.
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* Existing converters will be overwritten.
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*
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* @param array list of converters. The key of the array contains the mimetype
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* and the value is the command to be called for creating the preview
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*/
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function setConverters($arr) { /* {{{ */
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$this->converters = array_merge($this->converters, $arr);
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} /* }}} */
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/**
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* Check if converter for a given mimetype is set
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*
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* @param string $mimetype
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* @return boolean true if converter exists, otherwise false
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*/
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function hasConverter($mimetype) { /* {{{ */
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return array_key_exists($mimetype, $this->converters);
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} /* }}} */
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}
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