library/html2pdf/fpdi/pdf_context.php

   1 <?php
   2 //
   3 //  FPDI - Version 1.4.2
   4 //
   5 //    Copyright 2004-2011 Setasign - Jan Slabon
   6 //
   7 //  Licensed under the Apache License, Version 2.0 (the "License");
   8 //  you may not use this file except in compliance with the License.
   9 //  You may obtain a copy of the License at
  10 //
  11 //      http://www.apache.org/licenses/LICENSE-2.0
  12 //
  13 //  Unless required by applicable law or agreed to in writing, software
  14 //  distributed under the License is distributed on an "AS IS" BASIS,
  15 //  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  16 //  See the License for the specific language governing permissions and
  17 //  limitations under the License.
  18 //
  19
  20 if (!class_exists('pdf_context', false)) {
  21
  22     class pdf_context {
  23
  24         /**
  25          * Modi
  26          *
  27          * @var integer 0 = file | 1 = string
  28          */
  29         var $_mode = 0;
  30
  31         var $file;
  32         var $buffer;
  33         var $offset;
  34         var $length;
  35
  36         var $stack;
  37
  38         // Constructor
  39
  40         function pdf_context(&$f) {
  41                 $this->file =& $f;
  42                 if (is_string($this->file))
  43                     $this->_mode = 1;
  44                 $this->reset();
  45         }
  46
  47         // Optionally move the file
  48         // pointer to a new location
  49         // and reset the buffered data
  50
  51         function reset($pos = null, $l = 100) {
  52             if ($this->_mode == 0) {
  53                 if (!is_null ($pos)) {
  54                                 fseek ($this->file, $pos);
  55                         }
  56
  57                         $this->buffer = $l > 0 ? fread($this->file, $l) : '';
  58                         $this->length = strlen($this->buffer);
  59                         if ($this->length < $l)
  60                     $this->increase_length($l - $this->length);
  61             } else {
  62                 $this->buffer = $this->file;
  63                 $this->length = strlen($this->buffer);
  64             }
  65                 $this->offset = 0;
  66                 $this->stack = array();
  67         }
  68
  69         // Make sure that there is at least one
  70         // character beyond the current offset in
  71         // the buffer to prevent the tokenizer
  72         // from attempting to access data that does
  73         // not exist
  74
  75         function ensure_content() {
  76                 if ($this->offset >= $this->length - 1) {
  77                         return $this->increase_length();
  78                 } else {
  79                         return true;
  80                 }
  81         }
  82
  83         // Forcefully read more data into the buffer
  84
  85         function increase_length($l = 100) {
  86                         if ($this->_mode == 0 && feof($this->file)) {
  87                                 return false;
  88                         } else if ($this->_mode == 0) {
  89                             $totalLength = $this->length + $l;
  90                             do {
  91                                 $toRead = $totalLength - $this->length;
  92                                 if ($toRead < 1)
  93                                         break;
  94
  95                                 $this->buffer .= fread($this->file, $toRead);
  96                     } while ((($this->length = strlen($this->buffer)) != $totalLength) && !feof($this->file));
  97
  98                                 return true;
  99                         } else {
 100                         return false;
 101                         }
 102                 }
 103     }
 104 }