WebSVN – lars-tiefland.php_share – /fpdi/pdf_parser.php

<?php
//
//  FPDI - Version 1.4.2
//
//    Copyright 2004-2011 Setasign - Jan Slabon
//
//  Licensed under the Apache License, Version 2.0 (the "License");
//  you may not use this file except in compliance with the License.
//  You may obtain a copy of the License at
//
//      http://www.apache.org/licenses/LICENSE-2.0
//
//  Unless required by applicable law or agreed to in writing, software
//  distributed under the License is distributed on an "AS IS" BASIS,
//  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
//  See the License for the specific language governing permissions and
//  limitations under the License.
//

if (!defined ('PDF_TYPE_NULL'))
    define ('PDF_TYPE_NULL', 0);
if (!defined ('PDF_TYPE_NUMERIC'))
    define ('PDF_TYPE_NUMERIC', 1);
if (!defined ('PDF_TYPE_TOKEN'))
    define ('PDF_TYPE_TOKEN', 2);
if (!defined ('PDF_TYPE_HEX'))
    define ('PDF_TYPE_HEX', 3);
if (!defined ('PDF_TYPE_STRING'))
    define ('PDF_TYPE_STRING', 4);
if (!defined ('PDF_TYPE_DICTIONARY'))
    define ('PDF_TYPE_DICTIONARY', 5);
if (!defined ('PDF_TYPE_ARRAY'))
    define ('PDF_TYPE_ARRAY', 6);
if (!defined ('PDF_TYPE_OBJDEC'))
    define ('PDF_TYPE_OBJDEC', 7);
if (!defined ('PDF_TYPE_OBJREF'))
    define ('PDF_TYPE_OBJREF', 8);
if (!defined ('PDF_TYPE_OBJECT'))
    define ('PDF_TYPE_OBJECT', 9);
if (!defined ('PDF_TYPE_STREAM'))
    define ('PDF_TYPE_STREAM', 10);
if (!defined ('PDF_TYPE_BOOLEAN'))
    define ('PDF_TYPE_BOOLEAN', 11);
if (!defined ('PDF_TYPE_REAL'))
    define ('PDF_TYPE_REAL', 12);
    
require_once('pdf_context.php');

if (!class_exists('pdf_parser', false)) {
    
    class pdf_parser {
        
        /**
         * Filename
         * @var string
         */
        var $filename;
        
        /**
         * File resource
         * @var resource
         */
        var $f;
        
        /**
         * PDF Context
         * @var object pdf_context-Instance
         */
        var $c;
        
        /**
         * xref-Data
         * @var array
         */
        var $xref;
    
        /**
         * root-Object
         * @var array
         */
        var $root;
        
        /**
         * PDF version of the loaded document
         * @var string
         */
        var $pdfVersion;
        
        /**
             * For reading encrypted documents and xref/objectstreams are in use
             *
             * @var boolean
             */
            var $readPlain = true;
            
        /**
         * Constructor
         *
         * @param string $filename  Source-Filename
         */
        function pdf_parser($filename) {
            $this->filename = $filename;
            
            $this->f = @fopen($this->filename, 'rb');
    
            if (!$this->f)
                $this->error(sprintf('Cannot open %s !', $filename));
    
            $this->getPDFVersion();
    
            $this->c = new pdf_context($this->f);
            
            // Read xref-Data
            $this->xref = array();
            $this->pdf_read_xref($this->xref, $this->pdf_find_xref());
            
            // Check for Encryption
            $this->getEncryption();
    
            // Read root
            $this->pdf_read_root();
        }
        
        /**
         * Close the opened file
         */
        function closeFile() {
                if (isset($this->f) && is_resource($this->f)) {
                    fclose($this->f);   
                        unset($this->f);
                }       
        }
        
        /**
         * Print Error and die
         *
         * @param string $msg  Error-Message
         */
        function error($msg) {
                die('<b>PDF-Parser Error:</b> ' . $msg);        
        }
        
        /**
         * Check Trailer for Encryption
         */
        function getEncryption() {
            if (isset($this->xref['trailer'][1]['/Encrypt'])) {
                $this->error('File is encrypted!');
            }
        }
        
        /**
         * Find/Return /Root
         *
         * @return array
         */
        function pdf_find_root() {
            if ($this->xref['trailer'][1]['/Root'][0] != PDF_TYPE_OBJREF) {
                $this->error('Wrong Type of Root-Element! Must be an indirect reference');
            }
            
            return $this->xref['trailer'][1]['/Root'];
        }
    
        /**
         * Read the /Root
         */
        function pdf_read_root() {
            // read root
            $this->root = $this->pdf_resolve_object($this->c, $this->pdf_find_root());
        }
        
        /**
         * Get PDF-Version
         *
         * And reset the PDF Version used in FPDI if needed
         */
        function getPDFVersion() {
            fseek($this->f, 0);
            preg_match('/\d\.\d/',fread($this->f, 16), $m);
            if (isset($m[0]))
                $this->pdfVersion = $m[0];
            return $this->pdfVersion;
        }
        
        /**
         * Find the xref-Table
         */
        function pdf_find_xref() {
                $toRead = 1500;
                    
            $stat = fseek ($this->f, -$toRead, SEEK_END);
            if ($stat === -1) {
                fseek ($this->f, 0);
            }
                $data = fread($this->f, $toRead);
            
            $pos = strlen($data) - strpos(strrev($data), strrev('startxref')); 
            $data = substr($data, $pos);
            
            if (!preg_match('/\s*(\d+).*$/s', $data, $matches)) {
                $this->error('Unable to find pointer to xref table');
                }
    
                return (int) $matches[1];
        }
    
        /**
         * Read xref-table
         *
         * @param array $result Array of xref-table
         * @param integer $offset of xref-table
         */
        function pdf_read_xref(&$result, $offset) {
            $o_pos = $offset-min(20, $offset);
                fseek($this->f, $o_pos); // set some bytes backwards to fetch errorious docs
                
            $data = fread($this->f, 100);
            
            $xrefPos = strrpos($data, 'xref');
    
            if ($xrefPos === false) {
                fseek($this->f, $offset);
                $c = new pdf_context($this->f);
                $xrefStreamObjDec = $this->pdf_read_value($c);
                
                if (is_array($xrefStreamObjDec) && isset($xrefStreamObjDec[0]) && $xrefStreamObjDec[0] == PDF_TYPE_OBJDEC) {
                    $this->error(sprintf('This document (%s) probably uses a compression technique which is not supported by the free parser shipped with FPDI.', $this->filename));
                } else {            
                    $this->error('Unable to find xref table.');
                }
            }
            
            if (!isset($result['xref_location'])) {
                $result['xref_location'] = $o_pos + $xrefPos;
                $result['max_object'] = 0;
                }
    
                $cylces = -1;
            $bytesPerCycle = 100;
            
                fseek($this->f, $o_pos = $o_pos + $xrefPos + 4); // set the handle directly after the "xref"-keyword
            $data = fread($this->f, $bytesPerCycle);
            
            while (($trailerPos = strpos($data, 'trailer', max($bytesPerCycle * $cylces++, 0))) === false && !feof($this->f)) {
                $data .= fread($this->f, $bytesPerCycle);
            }
            
            if ($trailerPos === false) {
                $this->error('Trailer keyword not found after xref table');
            }
            
            $data = substr($data, 0, $trailerPos);
            
            // get Line-Ending
            preg_match_all("/(\r\n|\n|\r)/", substr($data, 0, 100), $m); // check the first 100 bytes for linebreaks
    
            $differentLineEndings = count(array_unique($m[0]));
            if ($differentLineEndings > 1) {
                $lines = preg_split("/(\r\n|\n|\r)/", $data, -1, PREG_SPLIT_NO_EMPTY);
            } else {
                $lines = explode($m[0][1], $data);
            }
            
            $data = $differentLineEndings = $m = null;
            unset($data, $differentLineEndings, $m);
            
            $linesCount = count($lines);
            
            $start = 1;
            
            for ($i = 0; $i < $linesCount; $i++) {
                $line = trim($lines[$i]);
                if ($line) {
                    $pieces = explode(' ', $line);
                    $c = count($pieces);
                    switch($c) {
                        case 2:
                            $start = (int)$pieces[0];
                            $end   = $start + (int)$pieces[1];
                            if ($end > $result['max_object'])
                                $result['max_object'] = $end;
                            break;
                        case 3:
                            if (!isset($result['xref'][$start]))
                                $result['xref'][$start] = array();
                            
                            if (!array_key_exists($gen = (int) $pieces[1], $result['xref'][$start])) {
                                $result['xref'][$start][$gen] = $pieces[2] == 'n' ? (int) $pieces[0] : null;
                            }
                            $start++;
                            break;
                        default:
                            $this->error('Unexpected data in xref table');
                    }
                }
            }
            
            $lines = $pieces = $line = $start = $end = $gen = null;
            unset($lines, $pieces, $line, $start, $end, $gen);
            
            fseek($this->f, $o_pos + $trailerPos + 7);
            
            $c = new pdf_context($this->f);
            $trailer = $this->pdf_read_value($c);
            
            $c = null;
            unset($c);
            
            if (!isset($result['trailer'])) {
                $result['trailer'] = $trailer;          
            }
            
            if (isset($trailer[1]['/Prev'])) {
                $this->pdf_read_xref($result, $trailer[1]['/Prev'][1]);
            } 
            
            $trailer = null;
            unset($trailer);
            
            return true;
        }
        
        /**
         * Reads an Value
         *
         * @param object $c pdf_context
         * @param string $token a Token
         * @return mixed
         */
        function pdf_read_value(&$c, $token = null) {
                if (is_null($token)) {
                    $token = $this->pdf_read_token($c);
                }
                
            if ($token === false) {
                    return false;
                }
    
                switch ($token) {
                case    '<':
                                // This is a hex string.
                                // Read the value, then the terminator
    
                    $pos = $c->offset;
    
                                while(1) {
    
                        $match = strpos ($c->buffer, '>', $pos);
                                
                                        // If you can't find it, try
                                        // reading more data from the stream
    
                                        if ($match === false) {
                                                if (!$c->increase_length()) {
                                                        return false;
                                                } else {
                                continue;
                                }
                                        }
    
                                        $result = substr ($c->buffer, $c->offset, $match - $c->offset);
                                        $c->offset = $match + 1;
                                        
                                        return array (PDF_TYPE_HEX, $result);
                    }
                    
                    break;
                        case    '<<':
                                // This is a dictionary.
    
                                $result = array();
    
                                // Recurse into this function until we reach
                                // the end of the dictionary.
                                while (($key = $this->pdf_read_token($c)) !== '>>') {
                                        if ($key === false) {
                                                return false;
                                        }
                                        
                                        if (($value =   $this->pdf_read_value($c)) === false) {
                                                return false;
                                        }
                                        
                                        // Catch missing value
                                        if ($value[0] == PDF_TYPE_TOKEN && $value[1] == '>>') {
                                            $result[$key] = array(PDF_TYPE_NULL);
                                            break;
                                        }
                                        
                                        $result[$key] = $value;
                                }
                                
                                return array (PDF_TYPE_DICTIONARY, $result);
    
                        case    '[':
                                // This is an array.
    
                                $result = array();
    
                                // Recurse into this function until we reach
                                // the end of the array.
                                while (($token = $this->pdf_read_token($c)) !== ']') {
                        if ($token === false) {
                                                return false;
                                        }
                                        
                                        if (($value = $this->pdf_read_value($c, $token)) === false) {
                            return false;
                                        }
                                        
                                        $result[] = $value;
                                }
                                
                    return array (PDF_TYPE_ARRAY, $result);
    
                        case    '('             :
                    // This is a string
                    $pos = $c->offset;
                    
                    $openBrackets = 1;
                                do {
                        for (; $openBrackets != 0 && $pos < $c->length; $pos++) {
                            switch (ord($c->buffer[$pos])) {
                                case 0x28: // '('
                                    $openBrackets++;
                                    break;
                                case 0x29: // ')'
                                    $openBrackets--;
                                    break;
                                case 0x5C: // backslash
                                    $pos++;
                            }
                        }
                                } while($openBrackets != 0 && $c->increase_length());
                                
                                $result = substr($c->buffer, $c->offset, $pos - $c->offset - 1);
                                $c->offset = $pos;
                                
                                return array (PDF_TYPE_STRING, $result);
    
                case 'stream':
                        $o_pos = ftell($c->file)-strlen($c->buffer);
                        $o_offset = $c->offset;
                        
                        $c->reset($startpos = $o_pos + $o_offset);
                        
                        $e = 0; // ensure line breaks in front of the stream
                        if ($c->buffer[0] == chr(10) || $c->buffer[0] == chr(13))
                                $e++;
                        if ($c->buffer[1] == chr(10) && $c->buffer[0] != chr(10))
                                $e++;
                        
                        if ($this->actual_obj[1][1]['/Length'][0] == PDF_TYPE_OBJREF) {
                                $tmp_c = new pdf_context($this->f);
                                $tmp_length = $this->pdf_resolve_object($tmp_c, $this->actual_obj[1][1]['/Length']);
                                $length = $tmp_length[1][1];
                        } else {
                                $length = $this->actual_obj[1][1]['/Length'][1];        
                        }
                                
                        if ($length > 0) {
                                $c->reset($startpos + $e,$length);
                                $v = $c->buffer;
                        } else {
                            $v = '';   
                        }
                        $c->reset($startpos + $e + $length + 9); // 9 = strlen("endstream")
                        
                        return array(PDF_TYPE_STREAM, $v);
                        
                default :
                        if (is_numeric ($token)) {
                        // A numeric token. Make sure that
                                        // it is not part of something else.
                                        if (($tok2 = $this->pdf_read_token ($c)) !== false) {
                            if (is_numeric ($tok2)) {
    
                                                        // Two numeric tokens in a row.
                                                        // In this case, we're probably in
                                                        // front of either an object reference
                                                        // or an object specification.
                                                        // Determine the case and return the data
                                                        if (($tok3 = $this->pdf_read_token ($c)) !== false) {
                                    switch ($tok3) {
                                                                        case 'obj':
                                            return array (PDF_TYPE_OBJDEC, (int) $token, (int) $tok2);
                                                                        case 'R':
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(root)/fpdi/pdf_parser.php – Revision 1
