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<?php
/**
* This file is part of FPDI
*
* @package setasign\Fpdi
* @copyright Copyright (c) 2020 Setasign GmbH & Co. KG (https://www.setasign.com)
* @license http://opensource.org/licenses/mit-license The MIT License
*/
namespace setasign\Fpdi\PdfReader;
use setasign\Fpdi\PdfParser\Filter\FilterException;
use setasign\Fpdi\PdfParser\PdfParser;
use setasign\Fpdi\PdfParser\PdfParserException;
use setasign\Fpdi\PdfParser\Type\PdfArray;
use setasign\Fpdi\PdfParser\Type\PdfDictionary;
use setasign\Fpdi\PdfParser\Type\PdfIndirectObject;
use setasign\Fpdi\PdfParser\Type\PdfNull;
use setasign\Fpdi\PdfParser\Type\PdfNumeric;
use setasign\Fpdi\PdfParser\Type\PdfStream;
use setasign\Fpdi\PdfParser\Type\PdfType;
use setasign\Fpdi\PdfParser\Type\PdfTypeException;
use setasign\Fpdi\PdfReader\DataStructure\Rectangle;
use setasign\Fpdi\PdfParser\CrossReference\CrossReferenceException;
/**
* Class representing a page of a PDF document
*/
class Page
{
/**
* @var PdfIndirectObject
*/
protected $pageObject;
/**
* @var PdfDictionary
*/
protected $pageDictionary;
/**
* @var PdfParser
*/
protected $parser;
/**
* Inherited attributes
*
* @var null|array
*/
protected $inheritedAttributes;
/**
* Page constructor.
*
* @param PdfIndirectObject $page
* @param PdfParser $parser
*/
public function __construct(PdfIndirectObject $page, PdfParser $parser)
{
$this->pageObject = $page;
$this->parser = $parser;
}
/**
* Get the indirect object of this page.
*
* @return PdfIndirectObject
*/
public function getPageObject()
{
return $this->pageObject;
}
/**
* Get the dictionary of this page.
*
* @return PdfDictionary
* @throws PdfParserException
* @throws PdfTypeException
* @throws CrossReferenceException
*/
public function getPageDictionary()
{
if (null === $this->pageDictionary) {
$this->pageDictionary = PdfDictionary::ensure(PdfType::resolve($this->getPageObject(), $this->parser));
}
return $this->pageDictionary;
}
/**
* Get a page attribute.
*
* @param string $name
* @param bool $inherited
* @return PdfType|null
* @throws PdfParserException
* @throws PdfTypeException
* @throws CrossReferenceException
*/
public function getAttribute($name, $inherited = true)
{
$dict = $this->getPageDictionary();
if (isset($dict->value[$name])) {
return $dict->value[$name];
}
$inheritedKeys = ['Resources', 'MediaBox', 'CropBox', 'Rotate'];
if ($inherited && \in_array($name, $inheritedKeys, true)) {
if ($this->inheritedAttributes === null) {
$this->inheritedAttributes = [];
$inheritedKeys = \array_filter($inheritedKeys, function ($key) use ($dict) {
return !isset($dict->value[$key]);
});
if (\count($inheritedKeys) > 0) {
$parentDict = PdfType::resolve(PdfDictionary::get($dict, 'Parent'), $this->parser);
while ($parentDict instanceof PdfDictionary) {
foreach ($inheritedKeys as $index => $key) {
if (isset($parentDict->value[$key])) {
$this->inheritedAttributes[$key] = $parentDict->value[$key];
unset($inheritedKeys[$index]);
}
}
/** @noinspection NotOptimalIfConditionsInspection */
if (isset($parentDict->value['Parent']) && \count($inheritedKeys) > 0) {
$parentDict = PdfType::resolve(PdfDictionary::get($parentDict, 'Parent'), $this->parser);
} else {
break;
}
}
}
}
if (isset($this->inheritedAttributes[$name])) {
return $this->inheritedAttributes[$name];
}
}
return null;
}
/**
* Get the rotation value.
*
* @return int
* @throws PdfParserException
* @throws PdfTypeException
* @throws CrossReferenceException
*/
public function getRotation()
{
$rotation = $this->getAttribute('Rotate');
if (null === $rotation) {
return 0;
}
$rotation = PdfNumeric::ensure(PdfType::resolve($rotation, $this->parser))->value % 360;
if ($rotation < 0) {
$rotation += 360;
}
return $rotation;
}
/**
* Get a boundary of this page.
*
* @param string $box
* @param bool $fallback
* @return bool|Rectangle
* @throws PdfParserException
* @throws PdfTypeException
* @throws CrossReferenceException
* @see PageBoundaries
*/
public function getBoundary($box = PageBoundaries::CROP_BOX, $fallback = true)
{
$value = $this->getAttribute($box);
if ($value !== null) {
return Rectangle::byPdfArray($value, $this->parser);
}
if ($fallback === false) {
return false;
}
switch ($box) {
case PageBoundaries::BLEED_BOX:
case PageBoundaries::TRIM_BOX:
case PageBoundaries::ART_BOX:
return $this->getBoundary(PageBoundaries::CROP_BOX, true);
case PageBoundaries::CROP_BOX:
return $this->getBoundary(PageBoundaries::MEDIA_BOX, true);
}
return false;
}
/**
* Get the width and height of this page.
*
* @param string $box
* @param bool $fallback
* @return array|bool
* @throws PdfParserException
* @throws PdfTypeException
* @throws CrossReferenceException
*/
public function getWidthAndHeight($box = PageBoundaries::CROP_BOX, $fallback = true)
{
$boundary = $this->getBoundary($box, $fallback);
if ($boundary === false) {
return false;
}
$rotation = $this->getRotation();
$interchange = ($rotation / 90) % 2;
return [
$interchange ? $boundary->getHeight() : $boundary->getWidth(),
$interchange ? $boundary->getWidth() : $boundary->getHeight()
];
}
/**
* Get the raw content stream.
*
* @return string
* @throws PdfReaderException
* @throws PdfTypeException
* @throws FilterException
* @throws PdfParserException
*/
public function getContentStream()
{
$dict = $this->getPageDictionary();
$contents = PdfType::resolve(PdfDictionary::get($dict, 'Contents'), $this->parser);
if ($contents instanceof PdfNull) {
return '';
}
if ($contents instanceof PdfArray) {
$result = [];
foreach ($contents->value as $content) {
$content = PdfType::resolve($content, $this->parser);
if (!($content instanceof PdfStream)) {
continue;
}
$result[] = $content->getUnfilteredStream();
}
return \implode("\n", $result);
}
if ($contents instanceof PdfStream) {
return $contents->getUnfilteredStream();
}
throw new PdfReaderException(
'Array or stream expected.',
PdfReaderException::UNEXPECTED_DATA_TYPE
);
}
}
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