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<?php
//
// FPDI - Version 1.2
//
// Copyright 2004-2007 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.
//
class pdf_context {
var $file;
var $buffer;
var $offset;
var $length;
var $stack;
// Constructor
function pdf_context($f) {
$this->file = $f;
$this->reset();
}
// Optionally move the file
// pointer to a new location
// and reset the buffered data
function reset($pos = null, $l = 100) {
if (!is_null ($pos)) {
fseek ($this->file, $pos);
}
$this->buffer = $l > 0 ? fread($this->file, $l) : '';
$this->offset = 0;
$this->length = strlen($this->buffer);
$this->stack = array();
}
// Make sure that there is at least one
// character beyond the current offset in
// the buffer to prevent the tokenizer
// from attempting to access data that does
// not exist
function ensure_content() {
if ($this->offset >= $this->length - 1) {
return $this->increase_length();
} else {
return true;
}
}
// Forcefully read more data into the buffer
function increase_length($l=100) {
if (feof($this->file)) {
return false;
} else {
$this->buffer .= fread($this->file, $l);
$this->length = strlen($this->buffer);
return true;
}
}
}
?>
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