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<?php
/**
* @file
* This file is part of the PdfParser library.
*
* @author Sébastien MALOT <sebastien@malot.fr>
*
* @date 2017-01-03
*
* @license LGPLv3
*
* @url <https://github.com/smalot/pdfparser>
*
* PdfParser is a pdf library written in PHP, extraction oriented.
* Copyright (C) 2017 - Sébastien MALOT <sebastien@malot.fr>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program.
* If not, see <http://www.pdfparser.org/sites/default/LICENSE.txt>.
*/
namespace Smalot\PdfParser;
use Smalot\PdfParser\Encoding\PDFDocEncoding;
/**
* Technical references :
* - http://www.mactech.com/articles/mactech/Vol.15/15.09/PDFIntro/index.html
* - http://framework.zend.com/issues/secure/attachment/12512/Pdf.php
* - http://www.php.net/manual/en/ref.pdf.php#74211
* - http://cpansearch.perl.org/src/JV/PostScript-Font-1.10.02/lib/PostScript/ISOLatin1Encoding.pm
* - http://cpansearch.perl.org/src/JV/PostScript-Font-1.10.02/lib/PostScript/ISOLatin9Encoding.pm
* - http://cpansearch.perl.org/src/JV/PostScript-Font-1.10.02/lib/PostScript/StandardEncoding.pm
* - http://cpansearch.perl.org/src/JV/PostScript-Font-1.10.02/lib/PostScript/WinAnsiEncoding.pm
*
* Class Document
*/
class Document
{
/**
* @var PDFObject[]
*/
protected $objects = [];
/**
* @var array
*/
protected $dictionary = [];
/**
* @var Header
*/
protected $trailer;
/**
* @var array<mixed>
*/
protected $metadata = [];
/**
* @var array
*/
protected $details;
public function __construct()
{
$this->trailer = new Header([], $this);
}
public function init()
{
$this->buildDictionary();
$this->buildDetails();
// Propagate init to objects.
foreach ($this->objects as $object) {
$object->getHeader()->init();
$object->init();
}
}
/**
* Build dictionary based on type header field.
*/
protected function buildDictionary()
{
// Build dictionary.
$this->dictionary = [];
foreach ($this->objects as $id => $object) {
// Cache objects by type and subtype
$type = $object->getHeader()->get('Type')->getContent();
if (null != $type) {
if (!isset($this->dictionary[$type])) {
$this->dictionary[$type] = [
'all' => [],
'subtype' => [],
];
}
$this->dictionary[$type]['all'][$id] = $object;
$subtype = $object->getHeader()->get('Subtype')->getContent();
if (null != $subtype) {
if (!isset($this->dictionary[$type]['subtype'][$subtype])) {
$this->dictionary[$type]['subtype'][$subtype] = [];
}
$this->dictionary[$type]['subtype'][$subtype][$id] = $object;
}
}
}
}
/**
* Build details array.
*/
protected function buildDetails()
{
// Build details array.
$details = [];
// Extract document info
if ($this->trailer->has('Info')) {
/** @var PDFObject $info */
$info = $this->trailer->get('Info');
// This could be an ElementMissing object, so we need to check for
// the getHeader method first.
if (null !== $info && method_exists($info, 'getHeader')) {
$details = $info->getHeader()->getDetails();
}
}
// Retrieve the page count
try {
$pages = $this->getPages();
$details['Pages'] = \count($pages);
} catch (\Exception $e) {
$details['Pages'] = 0;
}
// Decode and repair encoded document properties
foreach ($details as $key => $value) {
if (\is_string($value)) {
// If the string is already UTF-8 encoded, that means we only
// need to repair Adobe's ham-fisted insertion of line-feeds
// every ~127 characters, which doesn't seem to be multi-byte
// safe
if (mb_check_encoding($value, 'UTF-8')) {
// Remove literal backslash + line-feed "\\r"
$value = str_replace("\x5c\x0d", '', $value);
// Remove backslash plus bytes written into high part of
// multibyte unicode character
while (preg_match("/\x5c\x5c\xe0([\xb4-\xb8])(.)/", $value, $match)) {
$diff = (\ord($match[1]) - 182) * 64;
$newbyte = PDFDocEncoding::convertPDFDoc2UTF8(\chr(\ord($match[2]) + $diff));
$value = preg_replace("/\x5c\x5c\xe0".$match[1].$match[2].'/', $newbyte, $value);
}
// Remove bytes written into low part of multibyte unicode
// character
while (preg_match("/(.)\x9c\xe0([\xb3-\xb7])/", $value, $match)) {
$diff = \ord($match[2]) - 181;
$newbyte = \chr(\ord($match[1]) + $diff);
$value = preg_replace('/'.$match[1]."\x9c\xe0".$match[2].'/', $newbyte, $value);
}
// Remove this byte string that Adobe occasionally adds
// between two single byte characters in a unicode string
$value = str_replace("\xe5\xb0\x8d", '', $value);
$details[$key] = $value;
} else {
// If the string is just PDFDocEncoding, remove any line-feeds
// and decode the whole thing.
$value = str_replace("\\\r", '', $value);
$details[$key] = PDFDocEncoding::convertPDFDoc2UTF8($value);
}
}
}
$details = array_merge($details, $this->metadata);
$this->details = $details;
}
/**
* Extract XMP Metadata
*/
public function extractXMPMetadata(string $content): void
{
$xml = xml_parser_create();
xml_parser_set_option($xml, \XML_OPTION_SKIP_WHITE, 1);
if (1 === xml_parse_into_struct($xml, $content, $values, $index)) {
/*
* short overview about the following code parts:
*
* The output of xml_parse_into_struct is a single dimensional array (= $values), and the $stack is a last-on,
* first-off array of pointers to positions in $metadata, while iterating through it, that potentially turn the
* results into a more intuitive multi-dimensional array. When an "open" XML tag is encountered,
* we save the current $metadata context in the $stack, then create a child array of $metadata and
* make that the current $metadata context. When a "close" XML tag is encountered, the operations are
* reversed: the most recently added $metadata context from $stack (IOW, the parent of the current
* element) is set as the current $metadata context.
*/
$metadata = [];
$stack = [];
foreach ($values as $val) {
// Standardize to lowercase
$val['tag'] = strtolower($val['tag']);
// Ignore structural x: and rdf: XML elements
if (0 === strpos($val['tag'], 'x:')) {
continue;
} elseif (0 === strpos($val['tag'], 'rdf:') && 'rdf:li' != $val['tag']) {
continue;
}
switch ($val['type']) {
case 'open':
// Create an array of list items
if ('rdf:li' == $val['tag']) {
$metadata[] = [];
// Move up one level in the stack
$stack[\count($stack)] = &$metadata;
$metadata = &$metadata[\count($metadata) - 1];
} else {
// Else create an array of named values
$metadata[$val['tag']] = [];
// Move up one level in the stack
$stack[\count($stack)] = &$metadata;
$metadata = &$metadata[$val['tag']];
}
break;
case 'complete':
if (isset($val['value'])) {
// Assign a value to this list item
if ('rdf:li' == $val['tag']) {
$metadata[] = $val['value'];
// Else assign a value to this property
} else {
$metadata[$val['tag']] = $val['value'];
}
}
break;
case 'close':
// If the value of this property is an array
if (\is_array($metadata)) {
// If the value is a single element array
// where the element is of type string, use
// the value of the first list item as the
// value for this property
if (1 == \count($metadata) && isset($metadata[0]) && \is_string($metadata[0])) {
$metadata = $metadata[0];
} elseif (0 == \count($metadata)) {
// if the value is an empty array, set
// the value of this property to the empty
// string
$metadata = '';
}
}
// Move down one level in the stack
$metadata = &$stack[\count($stack) - 1];
unset($stack[\count($stack) - 1]);
break;
}
}
// Only use this metadata if it's referring to a PDF
if (isset($metadata['dc:format']) && 'application/pdf' == $metadata['dc:format']) {
// According to the XMP specifications: 'Conflict resolution
// for separate packets that describe the same resource is
// beyond the scope of this document.' - Section 6.1
// Source: https://www.adobe.com/devnet/xmp.html
// Source: https://github.com/adobe/XMP-Toolkit-SDK/blob/main/docs/XMPSpecificationPart1.pdf
// So if there are multiple XMP blocks, just merge the values
// of each found block over top of the existing values
$this->metadata = array_merge($this->metadata, $metadata);
}
}
xml_parser_free($xml);
}
public function getDictionary(): array
{
return $this->dictionary;
}
/**
* @param PDFObject[] $objects
*/
public function setObjects($objects = [])
{
$this->objects = (array) $objects;
$this->init();
}
/**
* @return PDFObject[]
*/
public function getObjects()
{
return $this->objects;
}
/**
* @return PDFObject|Font|Page|Element|null
*/
public function getObjectById(string $id)
{
if (isset($this->objects[$id])) {
return $this->objects[$id];
}
return null;
}
public function hasObjectsByType(string $type, ?string $subtype = null): bool
{
return 0 < \count($this->getObjectsByType($type, $subtype));
}
public function getObjectsByType(string $type, ?string $subtype = null): array
{
if (!isset($this->dictionary[$type])) {
return [];
}
if (null != $subtype) {
if (!isset($this->dictionary[$type]['subtype'][$subtype])) {
return [];
}
return $this->dictionary[$type]['subtype'][$subtype];
}
return $this->dictionary[$type]['all'];
}
/**
* @return Font[]
*/
public function getFonts()
{
return $this->getObjectsByType('Font');
}
public function getFirstFont(): ?Font
{
$fonts = $this->getFonts();
if ([] === $fonts) {
return null;
}
return reset($fonts);
}
/**
* @return Page[]
*
* @throws \Exception
*/
public function getPages()
{
if ($this->hasObjectsByType('Catalog')) {
// Search for catalog to list pages.
$catalogues = $this->getObjectsByType('Catalog');
$catalogue = reset($catalogues);
/** @var Pages $object */
$object = $catalogue->get('Pages');
if (method_exists($object, 'getPages')) {
return $object->getPages(true);
}
}
if ($this->hasObjectsByType('Pages')) {
// Search for pages to list kids.
$pages = [];
/** @var Pages[] $objects */
$objects = $this->getObjectsByType('Pages');
foreach ($objects as $object) {
$pages = array_merge($pages, $object->getPages(true));
}
return $pages;
}
if ($this->hasObjectsByType('Page')) {
// Search for 'page' (unordered pages).
$pages = $this->getObjectsByType('Page');
return array_values($pages);
}
throw new \Exception('Missing catalog.');
}
public function getText(?int $pageLimit = null): string
{
$texts = [];
$pages = $this->getPages();
// Only use the first X number of pages if $pageLimit is set and numeric.
if (\is_int($pageLimit) && 0 < $pageLimit) {
$pages = \array_slice($pages, 0, $pageLimit);
}
foreach ($pages as $index => $page) {
/**
* In some cases, the $page variable may be null.
*/
if (null === $page) {
continue;
}
if ($text = trim($page->getText())) {
$texts[] = $text;
}
}
return implode("\n\n", $texts);
}
public function getTrailer(): Header
{
return $this->trailer;
}
public function setTrailer(Header $trailer)
{
$this->trailer = $trailer;
}
public function getDetails(): array
{
return $this->details;
}
}