inc/3rdparty/libraries/mpdf/mpdfi/pdf_context.php

   1 <?php
   2 //
   3 //  FPDI - Version 1.2
   4 //
   5 //    Copyright 2004-2007 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 class pdf_context {
  21
  22         var $file;
  23         var $buffer;
  24         var $offset;
  25         var $length;
  26
  27         var $stack;
  28
  29         // Constructor
  30
  31         function pdf_context($f) {
  32                 $this->file = $f;
  33                 $this->reset();
  34         }
  35
  36         // Optionally move the file
  37         // pointer to a new location
  38         // and reset the buffered data
  39
  40         function reset($pos = null, $l = 100) {
  41                 if (!is_null ($pos)) {
  42                         fseek ($this->file, $pos);
  43                 }
  44
  45                 $this->buffer = $l > 0 ? fread($this->file, $l) : '';
  46                 $this->offset = 0;
  47                 $this->length = strlen($this->buffer);
  48                 $this->stack = array();
  49         }
  50
  51         // Make sure that there is at least one
  52         // character beyond the current offset in
  53         // the buffer to prevent the tokenizer
  54         // from attempting to access data that does
  55         // not exist
  56
  57         function ensure_content() {
  58                 if ($this->offset >= $this->length - 1) {
  59                         return $this->increase_length();
  60                 } else {
  61                         return true;
  62                 }
  63         }
  64
  65         // Forcefully read more data into the buffer
  66
  67         function increase_length($l=100) {
  68                 if (feof($this->file)) {
  69                         return false;
  70                 } else {
  71                         $this->buffer .= fread($this->file, $l);
  72                         $this->length = strlen($this->buffer);
  73                         return true;
  74                 }
  75         }
  76
  77 }
  78 ?>