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