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349 lines
10 KiB
PHP
349 lines
10 KiB
PHP
<?php
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/**
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* @file
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* @deprecated since v7.12.0
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* Class PdfParser
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*
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* @author : Sebastien MALOT <sebastien@malot.fr>
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* @date : 2013-08-08
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*
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* References :
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* - http://www.mactech.com/articles/mactech/Vol.15/15.09/PDFIntro/index.html
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* - http://framework.zend.com/issues/secure/attachment/12512/Pdf.php
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* - http://www.php.net/manual/en/ref.pdf.php#74211
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*/
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#[\AllowDynamicProperties]
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class PdfParser
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{
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/**
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* Parse PDF file
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*
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* @deprecated since v7.12.0
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* @param string $filename
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* @return string
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*/
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public static function parseFile($filename)
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{
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$content = file_get_contents($filename);
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return self::extractText($content);
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}
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/**
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* Parse PDF content
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*
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* @deprecated since v7.12.0
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* @param string $content
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* @return string
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*/
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public static function parseContent($content)
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{
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return self::extractText($content);
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}
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/**
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* Convert a PDF into text.
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*
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* @deprecated since v7.12.0
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* @param string $filename The filename to extract the data from.
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* @return string The extracted text from the PDF
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*/
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protected static function extractText($data)
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{
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/**
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* Split apart the PDF document into sections. We will address each
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* section separately.
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*/
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$a_obj = self::getDataArray($data, 'obj', 'endobj');
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$j = 0;
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$a_chunks = array();
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/**
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* Attempt to extract each part of the PDF document into a 'filter'
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* element and a 'data' element. This can then be used to decode the
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* data.
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*/
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foreach ($a_obj as $obj) {
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$a_filter = self::getDataArray($obj, '<<', '>>');
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if (is_array($a_filter) && isset($a_filter[0])) {
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$a_chunks[$j]['filter'] = $a_filter[0];
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$a_data = self::getDataArray($obj, 'stream', 'endstream');
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if (is_array($a_data) && isset($a_data[0])) {
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$a_chunks[$j]['data'] = trim(substr((string) $a_data[0], strlen('stream'), strlen((string) $a_data[0]) - strlen('stream') - strlen('endstream')));
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}
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$j++;
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}
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}
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$result_data = null;
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// decode the chunks
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foreach ($a_chunks as $chunk) {
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// Look at each chunk decide if we can decode it by looking at the contents of the filter
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if (isset($chunk['data'])) {
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// look at the filter to find out which encoding has been used
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if (strpos((string) $chunk['filter'], 'FlateDecode') !== false) {
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// Use gzuncompress but suppress error messages.
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$data =@ gzuncompress($chunk['data']);
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} else {
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$data = $chunk['data'];
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}
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if (trim($data) != '') {
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// If we got data then attempt to extract it.
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$result_data .= ' ' . self::extractTextElements($data);
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}
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}
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}
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/**
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* Make sure we don't have large blocks of white space before and after
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* our string. Also extract alphanumerical information to reduce
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* redundant data.
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*/
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if (trim($result_data) == '') {
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return null;
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} else {
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// Optimize hyphened words
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$result_data = preg_replace('/\s*-[\r\n]+\s*/', '', $result_data);
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$result_data = preg_replace('/\s+/', ' ', $result_data);
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return $result_data;
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}
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}
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/**
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* @deprecated since v7.12.0
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* @param $content
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* @return string|string[]
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*/
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protected static function extractTextElements($content)
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{
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if (strpos((string) $content, '/CIDInit') === 0) {
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return '';
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}
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$text = '';
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$lines = explode("\n", $content);
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foreach ($lines as $line) {
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$line = trim($line);
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$matches = array();
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// Parse each lines to extract command and operator values
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if (preg_match('/^(?<command>.*[\)\] ])(?<operator>[a-z]+[\*]?)$/i', $line, $matches)) {
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$command = trim($matches['command']);
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// Convert octal encoding
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$found_octal_values = array();
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preg_match_all('/\\\\([0-9]{3})/', $command, $found_octal_values);
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foreach ($found_octal_values[0] as $value) {
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$octal = substr((string) $value, 1);
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if ((int)$octal < 40) {
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// Skips non printable chars
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$command = str_replace($value, '', $command);
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} else {
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$command = str_replace($value, chr(octdec($octal)), $command);
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}
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}
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// Removes encoded new lines, tabs, ...
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$command = preg_replace('/\\\\[\r\n]/', '', $command);
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$command = preg_replace('/\\\\[rnftb ]/', ' ', $command);
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// Force UTF-8 charset
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$encoding = mb_detect_encoding($command, array('ASCII', 'UTF-8', 'Windows-1252', 'ISO-8859-1'));
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if (strtoupper($encoding) != 'UTF-8') {
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if ($decoded = @iconv('CP1252', 'UTF-8//TRANSLIT//IGNORE', $command)) {
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$command = $decoded;
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}
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}
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// Removes leading spaces
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$operator = trim($matches['operator']);
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} else {
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$command = $line;
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$operator = '';
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}
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// Handle main operators
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switch ($operator) {
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// Set character spacing.
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case 'Tc':
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break;
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// Move text current point.
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case 'Td':
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$values = explode(' ', $command);
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$y = array_pop($values);
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$x = array_pop($values);
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if ($x > 0) {
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$text .= ' ';
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}
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if ($y < 0) {
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$text .= ' ';
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}
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break;
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// Move text current point and set leading.
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case 'TD':
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$values = explode(' ', $command);
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$y = array_pop($values);
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if ($y < 0) {
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$text .= "\n";
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}
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break;
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// Set font name and size.
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case 'Tf':
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$text.= ' ';
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break;
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// Display text, allowing individual character positioning
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case 'TJ':
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$start = mb_strpos($command, '[', null, 'UTF-8') + 1;
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$end = mb_strrpos($command, ']', null, 'UTF-8');
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$text.= self::parseTextCommand(mb_substr($command, $start, $end - $start, 'UTF-8'));
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break;
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// Display text.
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case 'Tj':
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$start = mb_strpos($command, '(', null, 'UTF-8') + 1;
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$end = mb_strrpos($command, ')', null, 'UTF-8');
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$text.= mb_substr($command, $start, $end - $start, 'UTF-8'); // Removes round brackets
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break;
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// Set leading.
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case 'TL':
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// Set text matrix.
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case 'Tm':
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// $text.= ' ';
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break;
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// Set text rendering mode.
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case 'Tr':
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break;
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// Set super/subscripting text rise.
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case 'Ts':
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break;
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// Set text spacing.
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case 'Tw':
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break;
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// Set horizontal scaling.
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case 'Tz':
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break;
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// Move to start of next line.
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case 'T*':
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$text.= "\n";
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break;
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// Internal use
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case 'g':
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case 'gs':
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case 're':
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case 'f':
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// Begin text
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case 'BT':
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// End text
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case 'ET':
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break;
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case '':
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break;
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default:
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}
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}
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$text = str_replace(array('\\(', '\\)'), array('(', ')'), $text);
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return $text;
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}
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/**
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* Strip out the text from a small chunk of data.
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*
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* @deprecated since v7.12.0
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* @param string $text
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* @param int $font_size Currently not used
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*
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* @return string
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*/
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protected static function parseTextCommand($text, $font_size = 0)
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{
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$result = '';
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$cur_start_pos = 0;
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while (($cur_start_text = mb_strpos($text, '(', $cur_start_pos, 'UTF-8')) !== false) {
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// New text element found
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if ($cur_start_text - $cur_start_pos > 8) {
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$spacing = ' ';
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} else {
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$spacing_size = mb_substr($text, $cur_start_pos, $cur_start_text - $cur_start_pos, 'UTF-8');
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if ($spacing_size < -50) {
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$spacing = ' ';
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} else {
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$spacing = '';
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}
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}
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$cur_start_text++;
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$start_search_end = $cur_start_text;
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while (($cur_start_pos = mb_strpos($text, ')', $start_search_end, 'UTF-8')) !== false) {
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if (mb_substr($text, $cur_start_pos - 1, 1, 'UTF-8') != '\\') {
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break;
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}
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$start_search_end = $cur_start_pos + 1;
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}
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// something wrong happened
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if ($cur_start_pos === false) {
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break;
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}
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// Add to result
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$result .= $spacing . mb_substr($text, $cur_start_text, $cur_start_pos - $cur_start_text, 'UTF-8');
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$cur_start_pos++;
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}
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return $result;
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}
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/**
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* Convert a section of data into an array, separated by the start and end words.
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* @deprecated since v7.12.0
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* @param string $data The data.
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* @param string $start_word The start of each section of data.
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* @param string $end_word The end of each section of data.
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* @return array The array of data.
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*/
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protected static function getDataArray($data, $start_word, $end_word)
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{
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$start = 0;
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$end = 0;
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$a_results = array();
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while ($start !== false && $end !== false) {
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$start = strpos($data, $start_word, $end);
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$end = strpos($data, $end_word, $start);
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if ($end !== false && $start !== false) {
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// data is between start and end
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$a_results[] = substr($data, $start, $end - $start + strlen($end_word));
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}
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}
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return $a_results;
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}
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}
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