Proyectos de Subversion Moodle

<?php

/**

 * This file is part of FPDI

 *

 * @package   setasign\Fpdi

 * @copyright Copyright (c) 2023 Setasign GmbH & Co. KG (https://www.setasign.com)

 * @license   http://opensource.org/licenses/mit-license The MIT License

 */

namespace setasign\Fpdi;

use setasign\Fpdi\PdfParser\CrossReference\CrossReferenceException;

use setasign\Fpdi\PdfParser\Filter\FilterException;

use setasign\Fpdi\PdfParser\PdfParser;

use setasign\Fpdi\PdfParser\PdfParserException;

use setasign\Fpdi\PdfParser\StreamReader;

use setasign\Fpdi\PdfParser\Type\PdfArray;

use setasign\Fpdi\PdfParser\Type\PdfBoolean;

use setasign\Fpdi\PdfParser\Type\PdfDictionary;

use setasign\Fpdi\PdfParser\Type\PdfHexString;

use setasign\Fpdi\PdfParser\Type\PdfIndirectObject;

use setasign\Fpdi\PdfParser\Type\PdfIndirectObjectReference;

use setasign\Fpdi\PdfParser\Type\PdfName;

use setasign\Fpdi\PdfParser\Type\PdfNull;

use setasign\Fpdi\PdfParser\Type\PdfNumeric;

use setasign\Fpdi\PdfParser\Type\PdfStream;

use setasign\Fpdi\PdfParser\Type\PdfString;

use setasign\Fpdi\PdfParser\Type\PdfToken;

use setasign\Fpdi\PdfParser\Type\PdfType;

use setasign\Fpdi\PdfParser\Type\PdfTypeException;

use setasign\Fpdi\PdfReader\DataStructure\Rectangle;

use setasign\Fpdi\PdfReader\PageBoundaries;

use setasign\Fpdi\PdfReader\PdfReader;

use setasign\Fpdi\PdfReader\PdfReaderException;

use /* This namespace/class is used by the commercial FPDI PDF-Parser add-on. */

    /** @noinspection PhpUndefinedClassInspection */

    /** @noinspection PhpUndefinedNamespaceInspection */

    setasign\FpdiPdfParser\PdfParser\PdfParser as FpdiPdfParser;

/**

 * The FpdiTrait

 *

 * This trait offers the core functionalities of FPDI. By passing them to a trait we can reuse it with e.g. TCPDF in a

 * very easy way.

 */

trait FpdiTrait

{

    /**

     * The pdf reader instances.

     *

     * @var PdfReader[]

     */

    protected $readers = [];

    /**

     * Instances created internally.

     *

     * @var array

     */

    protected $createdReaders = [];

    /**

     * The current reader id.

     *

     * @var string|null

     */

    protected $currentReaderId;

    /**

     * Data of all imported pages.

     *

     * @var array

     */

    protected $importedPages = [];

    /**

     * A map from object numbers of imported objects to new assigned object numbers by FPDF.

     *

     * @var array

     */

    protected $objectMap = [];

    /**

     * An array with information about objects, which needs to be copied to the resulting document.

     *

     * @var array

     */

    protected $objectsToCopy = [];

    /**

     * Release resources and file handles.

     *

     * This method is called internally when the document is created successfully. By default it only cleans up

     * stream reader instances which were created internally.

     *

     * @param bool $allReaders

     */

    public function cleanUp($allReaders = false)

    {

        $readers = $allReaders ? array_keys($this->readers) : $this->createdReaders;

        foreach ($readers as $id) {

            $this->readers[$id]->getParser()->getStreamReader()->cleanUp();

            unset($this->readers[$id]);

        }

        $this->createdReaders = [];

    }

    /**

     * Set the minimal PDF version.

     *

     * @param string $pdfVersion

     */

    protected function setMinPdfVersion($pdfVersion)

    {

        if (\version_compare($pdfVersion, $this->PDFVersion, '>')) {

            $this->PDFVersion = $pdfVersion;

        }

    }

    /** @noinspection PhpUndefinedClassInspection */

    /**

     * Get a new pdf parser instance.

     *

     * @param StreamReader $streamReader

     * @param array $parserParams Individual parameters passed to the parser instance.

     * @return PdfParser|FpdiPdfParser

     */

    protected function getPdfParserInstance(StreamReader $streamReader, array $parserParams = [])

    {

        // note: if you get an exception here - turn off errors/warnings on not found classes for your autoloader.

        // psr-4 (https://www.php-fig.org/psr/psr-4/) says: Autoloader implementations MUST NOT throw

        // exceptions, MUST NOT raise errors of any level, and SHOULD NOT return a value.

        /** @noinspection PhpUndefinedClassInspection */

        if (\class_exists(FpdiPdfParser::class)) {

            /** @noinspection PhpUndefinedClassInspection */

            return new FpdiPdfParser($streamReader, $parserParams);

        }

        return new PdfParser($streamReader);

    }

    /**

     * Get an unique reader id by the $file parameter.

     *

     * @param string|resource|PdfReader|StreamReader $file An open file descriptor, a path to a file, a PdfReader

     *                                                     instance or a StreamReader instance.

     * @param array $parserParams Individual parameters passed to the parser instance.

     * @return string

     */

    protected function getPdfReaderId($file, array $parserParams = [])

    {

        if (\is_resource($file)) {

            $id = (string) $file;

        } elseif (\is_string($file)) {

            $id = \realpath($file);

            if ($id === false) {

                $id = $file;

            }

        } elseif (\is_object($file)) {

            $id = \spl_object_hash($file);

        } else {

            throw new \InvalidArgumentException(

                \sprintf('Invalid type in $file parameter (%s)', \gettype($file))

            );

        }

        /** @noinspection OffsetOperationsInspection */

        if (isset($this->readers[$id])) {

            return $id;

        }

        if (\is_resource($file)) {

            $streamReader = new StreamReader($file);

        } elseif (\is_string($file)) {

            $streamReader = StreamReader::createByFile($file);

            $this->createdReaders[] = $id;

        } else {

            $streamReader = $file;

        }

        $reader = new PdfReader($this->getPdfParserInstance($streamReader, $parserParams));

        /** @noinspection OffsetOperationsInspection */

        $this->readers[$id] = $reader;

        return $id;

    }

    /**

     * Get a pdf reader instance by its id.

     *

     * @param string $id

     * @return PdfReader

     */

    protected function getPdfReader($id)

    {

        if (isset($this->readers[$id])) {

            return $this->readers[$id];

        }

        throw new \InvalidArgumentException(

            \sprintf('No pdf reader with the given id (%s) exists.', $id)

        );

    }

    /**

     * Set the source PDF file.

     *

     * @param string|resource|StreamReader $file Path to the file or a stream resource or a StreamReader instance.

     * @return int The page count of the PDF document.

     * @throws PdfParserException

     */

    public function setSourceFile($file)

    {

        return $this->setSourceFileWithParserParams($file);

    }

    /**

     * Set the source PDF file with parameters which are passed to the parser instance.

     *

     * This method allows us to pass e.g. authentication information to the parser instance.

     *

     * @param string|resource|StreamReader $file Path to the file or a stream resource or a StreamReader instance.

     * @param array $parserParams Individual parameters passed to the parser instance.

     * @return int The page count of the PDF document.

     * @throws CrossReferenceException

     * @throws PdfParserException

     * @throws PdfTypeException

     */

    public function setSourceFileWithParserParams($file, array $parserParams = [])

    {

        $this->currentReaderId = $this->getPdfReaderId($file, $parserParams);

        $this->objectsToCopy[$this->currentReaderId] = [];

        $reader = $this->getPdfReader($this->currentReaderId);

        $this->setMinPdfVersion($reader->getPdfVersion());

        return $reader->getPageCount();

    }

    /**

     * Imports a page.

     *

     * @param int $pageNumber The page number.

     * @param string $box The page boundary to import. Default set to PageBoundaries::CROP_BOX.

     * @param bool $groupXObject Define the form XObject as a group XObject to support transparency (if used).

     * @param bool $importExternalLinks Define whether external links are imported or not.

     * @return string A unique string identifying the imported page.

     * @throws CrossReferenceException

     * @throws FilterException

     * @throws PdfParserException

     * @throws PdfTypeException

     * @throws PdfReaderException

     * @see PageBoundaries

     */

    public function importPage(

        $pageNumber,

        $box = PageBoundaries::CROP_BOX,

        $groupXObject = true,

        $importExternalLinks = false

    ) {

        if ($this->currentReaderId === null) {

            throw new \BadMethodCallException('No reader initiated. Call setSourceFile() first.');

        }

        $pageId = $this->currentReaderId;

        $pageNumber = (int)$pageNumber;

        $pageId .= '|' . $pageNumber . '|' . ($groupXObject ? '1' : '0') . '|' . ($importExternalLinks ? '1' : '0');

        // for backwards compatibility with FPDI 1

        $box = \ltrim($box, '/');

        if (!PageBoundaries::isValidName($box)) {

            throw new \InvalidArgumentException(

                \sprintf('Box name is invalid: "%s"', $box)

            );

        }

        $pageId .= '|' . $box;

        if (isset($this->importedPages[$pageId])) {

            return $pageId;

        }

        $reader = $this->getPdfReader($this->currentReaderId);

        $page = $reader->getPage($pageNumber);

        $bbox = $page->getBoundary($box);

        if ($bbox === false) {

            throw new PdfReaderException(

                \sprintf("Page doesn't have a boundary box (%s).", $box),

                PdfReaderException::MISSING_DATA

            );

        }

        $dict = new PdfDictionary();

        $dict->value['Type'] = PdfName::create('XObject');

        $dict->value['Subtype'] = PdfName::create('Form');

        $dict->value['FormType'] = PdfNumeric::create(1);

        $dict->value['BBox'] = $bbox->toPdfArray();

        if ($groupXObject) {

            $this->setMinPdfVersion('1.4');

            $dict->value['Group'] = PdfDictionary::create([

                'Type' => PdfName::create('Group'),

                'S' => PdfName::create('Transparency')

            ]);

        }

        $resources = $page->getAttribute('Resources');

        if ($resources !== null) {

            $dict->value['Resources'] = $resources;

        }

        list($width, $height) = $page->getWidthAndHeight($box);

        $a = 1;

        $b = 0;

        $c = 0;

        $d = 1;

        $e = -$bbox->getLlx();

        $f = -$bbox->getLly();

        $rotation = $page->getRotation();

        if ($rotation !== 0) {

            $rotation *= -1;

            $angle = $rotation * M_PI / 180;

            $a = \cos($angle);

            $b = \sin($angle);

            $c = -$b;

            $d = $a;

            switch ($rotation) {

                case -90:

                    $e = -$bbox->getLly();

                    $f = $bbox->getUrx();

                    break;

                case -180:

                    $e = $bbox->getUrx();

                    $f = $bbox->getUry();

                    break;

                case -270:

                    $e = $bbox->getUry();

                    $f = -$bbox->getLlx();

                    break;

            }

        }

        // we need to rotate/translate

        if ($a != 1 || $b != 0 || $c != 0 || $d != 1 || $e != 0 || $f != 0) {

            $dict->value['Matrix'] = PdfArray::create([

                PdfNumeric::create($a), PdfNumeric::create($b), PdfNumeric::create($c),

                PdfNumeric::create($d), PdfNumeric::create($e), PdfNumeric::create($f)

            ]);

        }

        // try to use the existing content stream

        $pageDict = $page->getPageDictionary();

        try {

            $contentsObject = PdfType::resolve(PdfDictionary::get($pageDict, 'Contents'), $reader->getParser(), true);

            $contents =  PdfType::resolve($contentsObject, $reader->getParser());

            // just copy the stream reference if it is only a single stream

            if (

                ($contentsIsStream = ($contents instanceof PdfStream))

                || ($contents instanceof PdfArray && \count($contents->value) === 1)

            ) {

                if ($contentsIsStream) {

                    /**

                     * @var PdfIndirectObject $contentsObject

                     */

                    $stream = $contents;

                } else {

                    $stream = PdfType::resolve($contents->value[0], $reader->getParser());

                }

                $filter = PdfDictionary::get($stream->value, 'Filter');

                if (!$filter instanceof PdfNull) {

                    $dict->value['Filter'] = $filter;

                }

                $length = PdfType::resolve(PdfDictionary::get($stream->value, 'Length'), $reader->getParser());

                $dict->value['Length'] = $length;

                $stream->value = $dict;

                // otherwise extract it from the array and re-compress the whole stream

            } else {

                $streamContent = $this->compress

                    ? \gzcompress($page->getContentStream())

                    : $page->getContentStream();

                $dict->value['Length'] = PdfNumeric::create(\strlen($streamContent));

                if ($this->compress) {

                    $dict->value['Filter'] = PdfName::create('FlateDecode');

                }

                $stream = PdfStream::create($dict, $streamContent);

            }

        // Catch faulty pages and use an empty content stream

        } catch (FpdiException $e) {

            $dict->value['Length'] = PdfNumeric::create(0);

            $stream = PdfStream::create($dict, '');

        }

        $externalLinks = [];

        if ($importExternalLinks) {

            $externalLinks = $page->getExternalLinks($box);

        }

        $this->importedPages[$pageId] = [

            'objectNumber' => null,

            'readerId' => $this->currentReaderId,

            'id' => 'TPL' . $this->getNextTemplateId(),

            'width' => $width / $this->k,

            'height' => $height / $this->k,

            'stream' => $stream,

            'externalLinks' => $externalLinks

        ];

        return $pageId;

    }

    /**

     * Draws an imported page onto the page.

     *

     * Give only one of the size parameters (width, height) to calculate the other one automatically in view to the

     * aspect ratio.

     *

     * @param mixed $pageId The page id

     * @param float|int|array $x The abscissa of upper-left corner. Alternatively you could use an assoc array

     *                           with the keys "x", "y", "width", "height", "adjustPageSize".

     * @param float|int $y The ordinate of upper-left corner.

     * @param float|int|null $width The width.

     * @param float|int|null $height The height.

     * @param bool $adjustPageSize

     * @return array The size.

     * @see Fpdi::getTemplateSize()

     */

    public function useImportedPage($pageId, $x = 0, $y = 0, $width = null, $height = null, $adjustPageSize = false)

    {

        if (\is_array($x)) {

            /** @noinspection OffsetOperationsInspection */

            unset($x['pageId']);

            \extract($x, EXTR_IF_EXISTS);

            /** @noinspection NotOptimalIfConditionsInspection */

            if (\is_array($x)) {

                $x = 0;

            }

        }

        if (!isset($this->importedPages[$pageId])) {

            throw new \InvalidArgumentException('Imported page does not exist!');

        }

        $importedPage = $this->importedPages[$pageId];

        $originalSize = $this->getTemplateSize($pageId);

        $newSize = $this->getTemplateSize($pageId, $width, $height);

        if ($adjustPageSize) {

            $this->setPageFormat($newSize, $newSize['orientation']);

        }

        $scaleX = ($newSize['width'] / $originalSize['width']);

        $scaleY = ($newSize['height'] / $originalSize['height']);

        $xPt = $x * $this->k;

        $yPt = $y * $this->k;

        $newHeightPt = $newSize['height'] * $this->k;

        $this->_out(

            // reset standard values, translate and scale

            \sprintf(

                'q 0 J 1 w 0 j 0 G 0 g %.4F 0 0 %.4F %.4F %.4F cm /%s Do Q',

                $scaleX,

                $scaleY,

                $xPt,

                $this->hPt - $yPt - $newHeightPt,

                $importedPage['id']

            )

        );

        if (count($importedPage['externalLinks']) > 0) {

            foreach ($importedPage['externalLinks'] as $externalLink) {

                // mPDF uses also 'externalLinks' but doesn't come with a rect-value

                if (!isset($externalLink['rect'])) {

                    continue;

                }

                /** @var Rectangle $rect */

                $rect = $externalLink['rect'];

                $this->Link(

                    $x + $rect->getLlx() / $this->k * $scaleX,

                    $y + $newSize['height'] - ($rect->getLly() + $rect->getHeight()) / $this->k * $scaleY,

                    $rect->getWidth() / $this->k * $scaleX,

                    $rect->getHeight()  / $this->k * $scaleY,

                    $externalLink['uri']

                );

                $this->adjustLastLink($externalLink, $xPt, $scaleX, $yPt, $newHeightPt, $scaleY, $importedPage);

            }

        }

        return $newSize;

    }

    /**

     * This method will add additional data to the last created link/annotation.

     *

     * It is separated because TCPDF uses its own logic to handle link annotations.

     * This method is overwritten in the TCPDF implementation.

     *

     * @param array $externalLink

     * @param float|int $xPt

     * @param float|int $scaleX

     * @param float|int $yPt

     * @param float|int $newHeightPt

     * @param float|int $scaleY

     * @param array $importedPage

     * @return void

     */

    protected function adjustLastLink($externalLink, $xPt, $scaleX, $yPt, $newHeightPt, $scaleY, $importedPage)

    {

        // let's create a relation of the newly created link to the data of the external link

        $lastLink = count($this->PageLinks[$this->page]);

        $this->PageLinks[$this->page][$lastLink - 1]['importedLink'] = $externalLink;

        if (count($externalLink['quadPoints']) > 0) {

            $quadPoints = [];

            for ($i = 0, $n = count($externalLink['quadPoints']); $i < $n; $i += 2) {

                $quadPoints[] = $xPt + $externalLink['quadPoints'][$i] * $scaleX;

                $quadPoints[] = $this->hPt - $yPt - $newHeightPt + $externalLink['quadPoints'][$i + 1] * $scaleY;

            }

            $this->PageLinks[$this->page][$lastLink - 1]['quadPoints'] = $quadPoints;

        }

    }

    /**

     * Get the size of an imported page.

     *

     * Give only one of the size parameters (width, height) to calculate the other one automatically in view to the

     * aspect ratio.

     *

     * @param mixed $tpl The template id

     * @param float|int|null $width The width.

     * @param float|int|null $height The height.

     * @return array|bool An array with following keys: width, height, 0 (=width), 1 (=height), orientation (L or P)

     */

    public function getImportedPageSize($tpl, $width = null, $height = null)

    {

        if (isset($this->importedPages[$tpl])) {

            $importedPage = $this->importedPages[$tpl];

            if ($width === null && $height === null) {

                $width = $importedPage['width'];

                $height = $importedPage['height'];

            } elseif ($width === null) {

                $width = $height * $importedPage['width'] / $importedPage['height'];

            }

            if ($height  === null) {

                $height = $width * $importedPage['height'] / $importedPage['width'];

            }

            if ($height <= 0. || $width <= 0.) {

                throw new \InvalidArgumentException('Width or height parameter needs to be larger than zero.');

            }

            return [

                'width' => $width,

                'height' => $height,

                1 => $height,

                'orientation' => $width > $height ? 'L' : 'P'

            ];

        }

        return false;

    }

    /**

     * Writes a PdfType object to the resulting buffer.

     *

     * @param PdfType $value

     * @throws PdfTypeException

     */

    protected function writePdfType(PdfType $value)

    {

        if ($value instanceof PdfNumeric) {

            if (\is_int($value->value)) {

                $this->_put($value->value . ' ', false);

            } else {

                $this->_put(\rtrim(\rtrim(\sprintf('%.5F', $value->value), '0'), '.') . ' ', false);

            }

        } elseif ($value instanceof PdfName) {

            $this->_put('/' . $value->value . ' ', false);

        } elseif ($value instanceof PdfString) {

            $this->_put('(' . $value->value . ')', false);

        } elseif ($value instanceof PdfHexString) {

            $this->_put('<' . $value->value . '>', false);

        } elseif ($value instanceof PdfBoolean) {

            $this->_put($value->value ? 'true ' : 'false ', false);

        } elseif ($value instanceof PdfArray) {

            $this->_put('[', false);

            foreach ($value->value as $entry) {

                $this->writePdfType($entry);

            }

            $this->_put(']');

        } elseif ($value instanceof PdfDictionary) {

            $this->_put('<<', false);

            foreach ($value->value as $name => $entry) {

                $this->_put('/' . $name . ' ', false);

                $this->writePdfType($entry);

            }

            $this->_put('>>');

        } elseif ($value instanceof PdfToken) {

            $this->_put($value->value);

        } elseif ($value instanceof PdfNull) {

            $this->_put('null ', false);

        } elseif ($value instanceof PdfStream) {

            $this->writePdfType($value->value);

            $this->_put('stream');

            $this->_put($value->getStream());

            $this->_put('endstream');

        } elseif ($value instanceof PdfIndirectObjectReference) {

            if (!isset($this->objectMap[$this->currentReaderId])) {

                $this->objectMap[$this->currentReaderId] = [];

            }

            if (!isset($this->objectMap[$this->currentReaderId][$value->value])) {

                $this->objectMap[$this->currentReaderId][$value->value] = ++$this->n;

                $this->objectsToCopy[$this->currentReaderId][] = $value->value;

            }

            $this->_put($this->objectMap[$this->currentReaderId][$value->value] . ' 0 R ', false);

        } elseif ($value instanceof PdfIndirectObject) {

            $n = $this->objectMap[$this->currentReaderId][$value->objectNumber];

            $this->_newobj($n);

            $this->writePdfType($value->value);

            // add newline before "endobj" for all objects in view to PDF/A conformance

            if (

                !(

                    ($value->value instanceof PdfArray) ||

                    ($value->value instanceof PdfDictionary) ||

                    ($value->value instanceof PdfToken) ||

                    ($value->value instanceof PdfStream)

                )

            ) {

                $this->_put("\n", false);

            }

            $this->_put('endobj');

        }

    }

}