root / drupal7 / sites / all / libraries / fpdi-version / pdf_parser.php @ 76df55b7
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<?php
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//
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// FPDI - Version 1.4.4
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//
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// Copyright 2004-2013 Setasign - Jan Slabon
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//
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|
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if (!defined ('PDF_TYPE_NULL')) |
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define ('PDF_TYPE_NULL', 0); |
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if (!defined ('PDF_TYPE_NUMERIC')) |
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define ('PDF_TYPE_NUMERIC', 1); |
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if (!defined ('PDF_TYPE_TOKEN')) |
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define ('PDF_TYPE_TOKEN', 2); |
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if (!defined ('PDF_TYPE_HEX')) |
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define ('PDF_TYPE_HEX', 3); |
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if (!defined ('PDF_TYPE_STRING')) |
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define ('PDF_TYPE_STRING', 4); |
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if (!defined ('PDF_TYPE_DICTIONARY')) |
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define ('PDF_TYPE_DICTIONARY', 5); |
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if (!defined ('PDF_TYPE_ARRAY')) |
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define ('PDF_TYPE_ARRAY', 6); |
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if (!defined ('PDF_TYPE_OBJDEC')) |
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define ('PDF_TYPE_OBJDEC', 7); |
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if (!defined ('PDF_TYPE_OBJREF')) |
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define ('PDF_TYPE_OBJREF', 8); |
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if (!defined ('PDF_TYPE_OBJECT')) |
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define ('PDF_TYPE_OBJECT', 9); |
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if (!defined ('PDF_TYPE_STREAM')) |
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define ('PDF_TYPE_STREAM', 10); |
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if (!defined ('PDF_TYPE_BOOLEAN')) |
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define ('PDF_TYPE_BOOLEAN', 11); |
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if (!defined ('PDF_TYPE_REAL')) |
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define ('PDF_TYPE_REAL', 12); |
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|
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require_once('pdf_context.php'); |
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|
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if (!class_exists('pdf_parser', false)) { |
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class pdf_parser { |
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|
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/**
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* Filename
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* @var string
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*/
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var $filename; |
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|
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/**
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* File resource
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* @var resource
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*/
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var $f; |
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|
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/**
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* PDF Context
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* @var object pdf_context-Instance
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*/
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var $c; |
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|
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/**
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* xref-Data
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* @var array
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*/
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var $xref; |
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|
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/**
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* root-Object
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* @var array
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*/
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var $root; |
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|
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/**
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* PDF version of the loaded document
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* @var string
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*/
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var $pdfVersion; |
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|
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/**
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* For reading encrypted documents and xref/objectstreams are in use
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*
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* @var boolean
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*/
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var $readPlain = true; |
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|
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/**
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* Constructor
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*
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* @param string $filename Source-Filename
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*/
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function pdf_parser($filename) { |
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$this->filename = $filename; |
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|
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$this->f = @fopen($this->filename, 'rb'); |
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|
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if (!$this->f) |
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$this->error(sprintf('Cannot open %s !', $filename)); |
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$this->getPDFVersion();
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$this->c = new pdf_context($this->f); |
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|
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// Read xref-Data
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$this->xref = array(); |
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$this->pdf_read_xref($this->xref, $this->pdf_find_xref()); |
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|
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// Check for Encryption
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$this->getEncryption();
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|
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// Read root
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$this->pdf_read_root();
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} |
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|
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/**
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* Close the opened file
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*/
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function closeFile() { |
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if (isset($this->f) && is_resource($this->f)) { |
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fclose($this->f); |
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unset($this->f); |
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} |
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} |
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/**
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* Print Error and die
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*
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* @param string $msg Error-Message
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*/
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function error($msg) { |
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die('<b>PDF-Parser Error:</b> ' . $msg); |
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} |
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/**
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* Check Trailer for Encryption
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*/
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function getEncryption() { |
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if (isset($this->xref['trailer'][1]['/Encrypt'])) { |
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$this->error('File is encrypted!'); |
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} |
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} |
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/**
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* Find/Return /Root
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*
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* @return array
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*/
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function pdf_find_root() { |
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if ($this->xref['trailer'][1]['/Root'][0] != PDF_TYPE_OBJREF) { |
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$this->error('Wrong Type of Root-Element! Must be an indirect reference'); |
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} |
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return $this->xref['trailer'][1]['/Root']; |
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} |
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/**
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* Read the /Root
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*/
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function pdf_read_root() { |
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// read root
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$this->root = $this->pdf_resolve_object($this->c, $this->pdf_find_root()); |
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} |
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|
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/**
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* Get PDF-Version
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*
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* And reset the PDF Version used in FPDI if needed
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*/
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function getPDFVersion() { |
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fseek($this->f, 0); |
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preg_match('/\d\.\d/',fread($this->f, 16), $m); |
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if (isset($m[0])) |
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$this->pdfVersion = $m[0]; |
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return $this->pdfVersion; |
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} |
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|
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/**
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* Find the xref-Table
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*/
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function pdf_find_xref() { |
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$toRead = 1500; |
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$stat = fseek ($this->f, -$toRead, SEEK_END); |
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if ($stat === -1) { |
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fseek ($this->f, 0); |
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} |
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$data = fread($this->f, $toRead); |
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$pos = strlen($data) - strpos(strrev($data), strrev('startxref')); |
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$data = substr($data, $pos); |
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if (!preg_match('/\s*(\d+).*$/s', $data, $matches)) { |
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$this->error('Unable to find pointer to xref table'); |
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} |
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return (int) $matches[1]; |
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} |
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/**
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* Read xref-table
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*
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* @param array $result Array of xref-table
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* @param integer $offset of xref-table
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*/
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function pdf_read_xref(&$result, $offset) { |
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$o_pos = $offset-min(20, $offset); |
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fseek($this->f, $o_pos); // set some bytes backwards to fetch errorious docs |
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$data = fread($this->f, 100); |
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$xrefPos = strrpos($data, 'xref'); |
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if ($xrefPos === false) { |
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fseek($this->f, $offset); |
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$c = new pdf_context($this->f); |
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$xrefStreamObjDec = $this->pdf_read_value($c); |
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|
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if (is_array($xrefStreamObjDec) && isset($xrefStreamObjDec[0]) && $xrefStreamObjDec[0] == PDF_TYPE_OBJDEC) { |
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$this->error(sprintf('This document (%s) probably uses a compression technique which is not supported by the free parser shipped with FPDI.', $this->filename)); |
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} else {
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$this->error('Unable to find xref table.'); |
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} |
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} |
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|
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if (!isset($result['xref_location'])) { |
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$result['xref_location'] = $o_pos + $xrefPos; |
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$result['max_object'] = 0; |
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} |
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|
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$cylces = -1; |
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$bytesPerCycle = 100; |
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|
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fseek($this->f, $o_pos = $o_pos + $xrefPos + 4); // set the handle directly after the "xref"-keyword |
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$data = fread($this->f, $bytesPerCycle); |
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|
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while (($trailerPos = strpos($data, 'trailer', max($bytesPerCycle * $cylces++, 0))) === false && !feof($this->f)) { |
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$data .= fread($this->f, $bytesPerCycle); |
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} |
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|
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if ($trailerPos === false) { |
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$this->error('Trailer keyword not found after xref table'); |
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} |
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$data = substr($data, 0, $trailerPos); |
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|
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// get Line-Ending
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preg_match_all("/(\r\n|\n|\r)/", substr($data, 0, 100), $m); // check the first 100 bytes for linebreaks |
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|
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$differentLineEndings = count(array_unique($m[0])); |
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if ($differentLineEndings > 1) { |
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$lines = preg_split("/(\r\n|\n|\r)/", $data, -1, PREG_SPLIT_NO_EMPTY); |
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} else {
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$lines = explode($m[0][1], $data); |
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} |
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$data = $differentLineEndings = $m = null; |
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unset($data, $differentLineEndings, $m); |
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|
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$linesCount = count($lines); |
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|
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$start = 1; |
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|
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for ($i = 0; $i < $linesCount; $i++) { |
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$line = trim($lines[$i]); |
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if ($line) { |
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$pieces = explode(' ', $line); |
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$c = count($pieces); |
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switch($c) { |
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case 2: |
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$start = (int)$pieces[0]; |
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$end = $start + (int)$pieces[1]; |
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if ($end > $result['max_object']) |
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$result['max_object'] = $end; |
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break;
|
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case 3: |
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if (!isset($result['xref'][$start])) |
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$result['xref'][$start] = array(); |
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|
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if (!array_key_exists($gen = (int) $pieces[1], $result['xref'][$start])) { |
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$result['xref'][$start][$gen] = $pieces[2] == 'n' ? (int) $pieces[0] : null; |
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} |
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$start++;
|
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break;
|
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default:
|
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$this->error('Unexpected data in xref table'); |
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} |
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} |
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} |
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|
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$lines = $pieces = $line = $start = $end = $gen = null; |
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unset($lines, $pieces, $line, $start, $end, $gen); |
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|
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fseek($this->f, $o_pos + $trailerPos + 7); |
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|
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$c = new pdf_context($this->f); |
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$trailer = $this->pdf_read_value($c); |
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|
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$c = null; |
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unset($c); |
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|
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if (!isset($result['trailer'])) { |
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$result['trailer'] = $trailer; |
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} |
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|
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if (isset($trailer[1]['/Prev'])) { |
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$this->pdf_read_xref($result, $trailer[1]['/Prev'][1]); |
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} |
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|
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$trailer = null; |
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unset($trailer); |
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|
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return true; |
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} |
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|
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/**
|
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* Reads an Value
|
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*
|
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* @param object $c pdf_context
|
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* @param string $token a Token
|
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* @return mixed
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*/
|
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function pdf_read_value(&$c, $token = null) { |
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if (is_null($token)) { |
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$token = $this->pdf_read_token($c); |
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} |
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|
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if ($token === false) { |
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return false; |
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} |
| 339 |
|
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switch ($token) { |
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case '<': |
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// This is a hex string.
|
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// Read the value, then the terminator
|
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|
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$pos = $c->offset; |
| 346 |
|
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while(1) { |
| 348 |
|
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$match = strpos ($c->buffer, '>', $pos); |
| 350 |
|
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// If you can't find it, try
|
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// reading more data from the stream
|
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|
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if ($match === false) { |
| 355 |
if (!$c->increase_length()) { |
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return false; |
| 357 |
} else {
|
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continue;
|
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} |
| 360 |
} |
| 361 |
|
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$result = substr ($c->buffer, $c->offset, $match - $c->offset); |
| 363 |
$c->offset = $match + 1; |
| 364 |
|
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return array (PDF_TYPE_HEX, $result); |
| 366 |
} |
| 367 |
|
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break;
|
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case '<<': |
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// This is a dictionary.
|
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|
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$result = array(); |
| 373 |
|
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// Recurse into this function until we reach
|
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// the end of the dictionary.
|
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while (($key = $this->pdf_read_token($c)) !== '>>') { |
| 377 |
if ($key === false) { |
| 378 |
return false; |
| 379 |
} |
| 380 |
|
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if (($value = $this->pdf_read_value($c)) === false) { |
| 382 |
return false; |
| 383 |
} |
| 384 |
|
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// Catch missing value
|
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if ($value[0] == PDF_TYPE_TOKEN && $value[1] == '>>') { |
| 387 |
$result[$key] = array(PDF_TYPE_NULL); |
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break;
|
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} |
| 390 |
|
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$result[$key] = $value; |
| 392 |
} |
| 393 |
|
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return array (PDF_TYPE_DICTIONARY, $result); |
| 395 |
|
| 396 |
case '[': |
| 397 |
// This is an array.
|
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|
| 399 |
$result = array(); |
| 400 |
|
| 401 |
// Recurse into this function until we reach
|
| 402 |
// the end of the array.
|
| 403 |
while (($token = $this->pdf_read_token($c)) !== ']') { |
| 404 |
if ($token === false) { |
| 405 |
return false; |
| 406 |
} |
| 407 |
|
| 408 |
if (($value = $this->pdf_read_value($c, $token)) === false) { |
| 409 |
return false; |
| 410 |
} |
| 411 |
|
| 412 |
$result[] = $value; |
| 413 |
} |
| 414 |
|
| 415 |
return array (PDF_TYPE_ARRAY, $result); |
| 416 |
|
| 417 |
case '(' : |
| 418 |
// This is a string
|
| 419 |
$pos = $c->offset; |
| 420 |
|
| 421 |
$openBrackets = 1; |
| 422 |
do {
|
| 423 |
for (; $openBrackets != 0 && $pos < $c->length; $pos++) { |
| 424 |
switch (ord($c->buffer[$pos])) { |
| 425 |
case 0x28: // '(' |
| 426 |
$openBrackets++;
|
| 427 |
break;
|
| 428 |
case 0x29: // ')' |
| 429 |
$openBrackets--;
|
| 430 |
break;
|
| 431 |
case 0x5C: // backslash |
| 432 |
$pos++;
|
| 433 |
} |
| 434 |
} |
| 435 |
} while($openBrackets != 0 && $c->increase_length()); |
| 436 |
|
| 437 |
$result = substr($c->buffer, $c->offset, $pos - $c->offset - 1); |
| 438 |
$c->offset = $pos; |
| 439 |
|
| 440 |
return array (PDF_TYPE_STRING, $result); |
| 441 |
|
| 442 |
case 'stream': |
| 443 |
$o_pos = ftell($c->file)-strlen($c->buffer); |
| 444 |
$o_offset = $c->offset; |
| 445 |
|
| 446 |
$c->reset($startpos = $o_pos + $o_offset); |
| 447 |
|
| 448 |
$e = 0; // ensure line breaks in front of the stream |
| 449 |
if ($c->buffer[0] == chr(10) || $c->buffer[0] == chr(13)) |
| 450 |
$e++;
|
| 451 |
if ($c->buffer[1] == chr(10) && $c->buffer[0] != chr(10)) |
| 452 |
$e++;
|
| 453 |
|
| 454 |
if ($this->actual_obj[1][1]['/Length'][0] == PDF_TYPE_OBJREF) { |
| 455 |
$tmp_c = new pdf_context($this->f); |
| 456 |
$tmp_length = $this->pdf_resolve_object($tmp_c, $this->actual_obj[1][1]['/Length']); |
| 457 |
$length = $tmp_length[1][1]; |
| 458 |
} else {
|
| 459 |
$length = $this->actual_obj[1][1]['/Length'][1]; |
| 460 |
} |
| 461 |
|
| 462 |
if ($length > 0) { |
| 463 |
$c->reset($startpos + $e,$length); |
| 464 |
$v = $c->buffer; |
| 465 |
} else {
|
| 466 |
$v = ''; |
| 467 |
} |
| 468 |
$c->reset($startpos + $e + $length + 9); // 9 = strlen("endstream") |
| 469 |
|
| 470 |
return array(PDF_TYPE_STREAM, $v); |
| 471 |
|
| 472 |
default :
|
| 473 |
if (is_numeric ($token)) { |
| 474 |
// A numeric token. Make sure that
|
| 475 |
// it is not part of something else.
|
| 476 |
if (($tok2 = $this->pdf_read_token ($c)) !== false) { |
| 477 |
if (is_numeric ($tok2)) { |
| 478 |
|
| 479 |
// Two numeric tokens in a row.
|
| 480 |
// In this case, we're probably in
|
| 481 |
// front of either an object reference
|
| 482 |
// or an object specification.
|
| 483 |
// Determine the case and return the data
|
| 484 |
if (($tok3 = $this->pdf_read_token ($c)) !== false) { |
| 485 |
switch ($tok3) { |
| 486 |
case 'obj': |
| 487 |
return array (PDF_TYPE_OBJDEC, (int) $token, (int) $tok2); |
| 488 |
case 'R': |
| 489 |
return array (PDF_TYPE_OBJREF, (int) $token, (int) $tok2); |
| 490 |
} |
| 491 |
// If we get to this point, that numeric value up
|
| 492 |
// there was just a numeric value. Push the extra
|
| 493 |
// tokens back into the stack and return the value.
|
| 494 |
array_push ($c->stack, $tok3); |
| 495 |
} |
| 496 |
} |
| 497 |
|
| 498 |
array_push ($c->stack, $tok2); |
| 499 |
} |
| 500 |
|
| 501 |
if ($token === (string)((int)$token)) |
| 502 |
return array (PDF_TYPE_NUMERIC, (int)$token); |
| 503 |
else
|
| 504 |
return array (PDF_TYPE_REAL, (float)$token); |
| 505 |
} elseif ($token == 'true' || $token == 'false') { |
| 506 |
return array (PDF_TYPE_BOOLEAN, $token == 'true'); |
| 507 |
} elseif ($token == 'null') { |
| 508 |
return array (PDF_TYPE_NULL); |
| 509 |
} else {
|
| 510 |
// Just a token. Return it.
|
| 511 |
return array (PDF_TYPE_TOKEN, $token); |
| 512 |
} |
| 513 |
} |
| 514 |
} |
| 515 |
|
| 516 |
/**
|
| 517 |
* Resolve an object
|
| 518 |
*
|
| 519 |
* @param object $c pdf_context
|
| 520 |
* @param array $obj_spec The object-data
|
| 521 |
* @param boolean $encapsulate Must set to true, cause the parsing and fpdi use this method only without this para
|
| 522 |
*/
|
| 523 |
function pdf_resolve_object(&$c, $obj_spec, $encapsulate = true) { |
| 524 |
// Exit if we get invalid data
|
| 525 |
if (!is_array($obj_spec)) { |
| 526 |
$ret = false; |
| 527 |
return $ret; |
| 528 |
} |
| 529 |
|
| 530 |
if ($obj_spec[0] == PDF_TYPE_OBJREF) { |
| 531 |
|
| 532 |
// This is a reference, resolve it
|
| 533 |
if (isset($this->xref['xref'][$obj_spec[1]][$obj_spec[2]])) { |
| 534 |
|
| 535 |
// Save current file position
|
| 536 |
// This is needed if you want to resolve
|
| 537 |
// references while you're reading another object
|
| 538 |
// (e.g.: if you need to determine the length
|
| 539 |
// of a stream)
|
| 540 |
|
| 541 |
$old_pos = ftell($c->file); |
| 542 |
|
| 543 |
// Reposition the file pointer and
|
| 544 |
// load the object header.
|
| 545 |
|
| 546 |
$c->reset($this->xref['xref'][$obj_spec[1]][$obj_spec[2]]); |
| 547 |
|
| 548 |
$header = $this->pdf_read_value($c); |
| 549 |
|
| 550 |
if ($header[0] != PDF_TYPE_OBJDEC || $header[1] != $obj_spec[1] || $header[2] != $obj_spec[2]) { |
| 551 |
$toSearchFor = $obj_spec[1] . ' ' . $obj_spec[2] . ' obj'; |
| 552 |
if (preg_match('/' . $toSearchFor . '/', $c->buffer)) { |
| 553 |
$c->offset = strpos($c->buffer, $toSearchFor) + strlen($toSearchFor); |
| 554 |
// reset stack
|
| 555 |
$c->stack = array(); |
| 556 |
} else {
|
| 557 |
$this->error("Unable to find object ({$obj_spec[1]}, {$obj_spec[2]}) at expected location"); |
| 558 |
} |
| 559 |
} |
| 560 |
|
| 561 |
// If we're being asked to store all the information
|
| 562 |
// about the object, we add the object ID and generation
|
| 563 |
// number for later use
|
| 564 |
$result = array(); |
| 565 |
$this->actual_obj =& $result; |
| 566 |
if ($encapsulate) { |
| 567 |
$result = array ( |
| 568 |
PDF_TYPE_OBJECT,
|
| 569 |
'obj' => $obj_spec[1], |
| 570 |
'gen' => $obj_spec[2] |
| 571 |
); |
| 572 |
} |
| 573 |
|
| 574 |
// Now simply read the object data until
|
| 575 |
// we encounter an end-of-object marker
|
| 576 |
while(1) { |
| 577 |
$value = $this->pdf_read_value($c); |
| 578 |
if ($value === false || count($result) > 4) { |
| 579 |
// in this case the parser coudn't find an endobj so we break here
|
| 580 |
break;
|
| 581 |
} |
| 582 |
|
| 583 |
if ($value[0] == PDF_TYPE_TOKEN && $value[1] === 'endobj') { |
| 584 |
break;
|
| 585 |
} |
| 586 |
|
| 587 |
$result[] = $value; |
| 588 |
} |
| 589 |
|
| 590 |
$c->reset($old_pos); |
| 591 |
|
| 592 |
if (isset($result[2][0]) && $result[2][0] == PDF_TYPE_STREAM) { |
| 593 |
$result[0] = PDF_TYPE_STREAM; |
| 594 |
} |
| 595 |
|
| 596 |
return $result; |
| 597 |
} |
| 598 |
} else {
|
| 599 |
return $obj_spec; |
| 600 |
} |
| 601 |
} |
| 602 |
|
| 603 |
|
| 604 |
|
| 605 |
/**
|
| 606 |
* Reads a token from the file
|
| 607 |
*
|
| 608 |
* @param object $c pdf_context
|
| 609 |
* @return mixed
|
| 610 |
*/
|
| 611 |
function pdf_read_token(&$c) |
| 612 |
{
|
| 613 |
// If there is a token available
|
| 614 |
// on the stack, pop it out and
|
| 615 |
// return it.
|
| 616 |
|
| 617 |
if (count($c->stack)) { |
| 618 |
return array_pop($c->stack); |
| 619 |
} |
| 620 |
|
| 621 |
// Strip away any whitespace
|
| 622 |
|
| 623 |
do {
|
| 624 |
if (!$c->ensure_content()) { |
| 625 |
return false; |
| 626 |
} |
| 627 |
$c->offset += strspn($c->buffer, "\x20\x0A\x0C\x0D\x09\x00", $c->offset); |
| 628 |
} while ($c->offset >= $c->length - 1); |
| 629 |
|
| 630 |
// Get the first character in the stream
|
| 631 |
|
| 632 |
$char = $c->buffer[$c->offset++]; |
| 633 |
|
| 634 |
switch ($char) { |
| 635 |
|
| 636 |
case '[': |
| 637 |
case ']': |
| 638 |
case '(': |
| 639 |
case ')': |
| 640 |
|
| 641 |
// This is either an array or literal string
|
| 642 |
// delimiter, Return it
|
| 643 |
|
| 644 |
return $char; |
| 645 |
|
| 646 |
case '<': |
| 647 |
case '>': |
| 648 |
|
| 649 |
// This could either be a hex string or
|
| 650 |
// dictionary delimiter. Determine the
|
| 651 |
// appropriate case and return the token
|
| 652 |
|
| 653 |
if ($c->buffer[$c->offset] == $char) { |
| 654 |
if (!$c->ensure_content()) { |
| 655 |
return false; |
| 656 |
} |
| 657 |
$c->offset++;
|
| 658 |
return $char . $char; |
| 659 |
} else {
|
| 660 |
return $char; |
| 661 |
} |
| 662 |
|
| 663 |
case '%': |
| 664 |
|
| 665 |
// This is a comment - jump over it!
|
| 666 |
|
| 667 |
$pos = $c->offset; |
| 668 |
while(1) { |
| 669 |
$match = preg_match("/(\r\n|\r|\n)/", $c->buffer, $m, PREG_OFFSET_CAPTURE, $pos); |
| 670 |
if ($match === 0) { |
| 671 |
if (!$c->increase_length()) { |
| 672 |
return false; |
| 673 |
} else {
|
| 674 |
continue;
|
| 675 |
} |
| 676 |
} |
| 677 |
|
| 678 |
$c->offset = $m[0][1]+strlen($m[0][0]); |
| 679 |
|
| 680 |
return $this->pdf_read_token($c); |
| 681 |
} |
| 682 |
|
| 683 |
default:
|
| 684 |
|
| 685 |
// This is "another" type of token (probably
|
| 686 |
// a dictionary entry or a numeric value)
|
| 687 |
// Find the end and return it.
|
| 688 |
|
| 689 |
if (!$c->ensure_content()) { |
| 690 |
return false; |
| 691 |
} |
| 692 |
|
| 693 |
while(1) { |
| 694 |
|
| 695 |
// Determine the length of the token
|
| 696 |
|
| 697 |
$pos = strcspn($c->buffer, "\x20%[]<>()/\x0A\x0C\x0D\x09\x00", $c->offset); |
| 698 |
|
| 699 |
if ($c->offset + $pos <= $c->length - 1) { |
| 700 |
break;
|
| 701 |
} else {
|
| 702 |
// If the script reaches this point,
|
| 703 |
// the token may span beyond the end
|
| 704 |
// of the current buffer. Therefore,
|
| 705 |
// we increase the size of the buffer
|
| 706 |
// and try again--just to be safe.
|
| 707 |
|
| 708 |
$c->increase_length();
|
| 709 |
} |
| 710 |
} |
| 711 |
|
| 712 |
$result = substr($c->buffer, $c->offset - 1, $pos + 1); |
| 713 |
|
| 714 |
$c->offset += $pos; |
| 715 |
return $result; |
| 716 |
} |
| 717 |
} |
| 718 |
} |
| 719 |
} |