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135 lines
4.2 KiB
135 lines
4.2 KiB
<?php
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// (c) Copyright by authors of the Tiki Wiki CMS Groupware Project
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//
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// All Rights Reserved. See copyright.txt for details and a complete list of authors.
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// Licensed under the GNU LESSER GENERAL PUBLIC LICENSE. See license.txt for details.
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// $Id$
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/**
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*
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* A wrapper for pdfimages, part of the poppler.freedesktop.org set of tools
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*
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* Class PdfImagesLib
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*/
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class PdfImagesLib
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{
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protected $binaryPath = 'pdfimages';
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protected $arguments;
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public $version;
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protected $source;
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protected $destination;
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/**
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* Sets the binary path of pdfimages
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* @param null $path|string The path to the pdfimages binary. Will default to Tiki preference location if not supplied.
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*/
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public function setBinaryPath($path = null)
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{
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global $prefs;
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if ($path) {
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$this->binaryPath = escapeshellcmd($path);
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} elseif (! empty($prefs['ocr_pdfimages_path'])) {
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$this->binaryPath = escapeshellcmd($prefs['ocr_pdfimages_path']);
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} else {
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$this->binaryPath = 'pdfimages';
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}
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}
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/**
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* Sets the binary version of pdfimages.
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* No version will be set upon error.
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*/
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public function setVersion()
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{
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$output = shell_exec(escapeshellarg($this->binaryPath) . ' -v 2>&1');
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preg_match('/[\d\.]+/', $output, $version);
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if (! empty($version[0])) {
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$this->version = $version[0];
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}
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}
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/**
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* Checks if pdfimages is installed
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*
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* @throws Exception If pdf images is not accessible on the local system.
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*/
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public function isInstalled()
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{
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$this->setVersion();
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if (! $this->version) {
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throw new Exception('pdfimages binary not found');
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}
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}
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/**
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* Arguments to pass, you may mix-n-match from the following depending on your binary version.
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* f <int> : first page to convert
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* l <int> : last page to convert
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* png : change the default output format to PNG
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* tiff : change the default output format to TIFF
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* j : write JPEG images as JPEG files
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* jp2 : write JPEG2000 images as JP2 files
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* jbig2 : write JBIG2 images as JBIG2 files
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* ccitt : write CCITT images as CCITT files
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* all : equivalent to -png -tiff -j -jp2 -jbig2 -ccitt
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* list : print list of images instead of saving
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* opw <string> : owner password (for encrypted files)
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* upw <string> : user password (for encrypted files)
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* p : include page numbers in output file names
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* q : don't print any messages or errors
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* v : print copyright and version info
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*
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* @param $argument string
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*/
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public function setArgument($argument)
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{
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$this->arguments[] = $argument;
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}
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/**
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* @param $sourcePDF string The file path to the PDF to be processed
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* @param $destinationFolder string The directory path to the folder to place the extracted images
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*
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* @throws Exception If either path is not reachable
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*/
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public function setFilePaths($sourcePDF, $destinationFolder)
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{
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if (! is_readable($sourcePDF)) {
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throw new Exception($this->source . 'not readable');
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}
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if (! is_writable($destinationFolder)) {
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throw new Exception($this->destination . ' is not writable');
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}
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$this->source = escapeshellarg($sourcePDF);
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$this->destination = escapeshellarg($destinationFolder);
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}
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/**
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* Execute the extraction of images with the binary app pdfimages
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* The arguments need to be previously set with an instance of PdfImagesLib
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* @throws Exception Thrown if pdfimages binary throws an error
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*/
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public function run()
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{
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$this->isInstalled();
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if (empty($this->arguments)) {
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$arguments = ' ';
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} else {
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$arguments = ' -' . implode(' -', $this->arguments) . ' ';
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}
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$error = shell_exec($this->binaryPath . $arguments . $this->source . ' ' . $this->destination . ' 2>&1');
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if ($error) {
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throw new Exception($error);
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}
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}
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}
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