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prints/pdf_context.php

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+<?php
+//
+//  FPDI - Version 1.1
+//
+//    Copyright 2004,2005 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);
+		}
+
+		$this->buffer = fread($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;
+		}
+	}
+
+}
+?>