<?php
/**
 * TNT OFFICIAL MODULE FOR PRESTASHOP
 *
 * @author    GFI Informatique <www.gfi.fr>
 * @copyright 2016-2017 GFI Informatique, 2016-2017 TNT
 * @license   https://opensource.org/licenses/MIT MIT License
 */

//
//  FPDI - Version 1.3.1
//
//    Copyright 2004-2009 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 TNTOfficiel_pdf_context {

    /**
     * Modi
     *
     * @var integer 0 = file | 1 = string
     */
    var $_mode = 0;

    var $file;
    var $buffer;
    var $offset;
    var $length;

    var $stack;

    // Constructor

    public function TNTOfficiel_pdf_context(&$f) {
        $this->file =& $f;
        if (is_string($this->file))
            $this->_mode = 1;
        $this->reset();
    }

    // Optionally move the file
    // pointer to a new location
    // and reset the buffered data

    public function reset($pos = null, $l = 100) {
        if ($this->_mode == 0) {
            if (!is_null ($pos)) {
                fseek ($this->file, $pos);
            }

            $this->buffer = $l > 0 ? fread($this->file, $l) : '';
            $this->length = strlen($this->buffer);
            if ($this->length < $l)
                $this->increase_length($l - $this->length);
        } else {
            $this->buffer = $this->file;
            $this->length = strlen($this->buffer);
        }
        $this->offset = 0;
        $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

    public function ensure_content() {
        if ($this->offset >= $this->length - 1) {
            return $this->increase_length();
        } else {
            return true;
        }
    }

    // Forcefully read more data into the buffer

    public function increase_length($l=100) {
        if ($this->_mode == 0 && feof($this->file)) {
            return false;
        } elseif ($this->_mode == 0) {
            $totalLength = $this->length + $l;
            do {
                $this->buffer .= fread($this->file, $totalLength-$this->length);
            } while ((($this->length = strlen($this->buffer)) != $totalLength) && !feof($this->file));

            return true;
        } else {
            return false;
        }
    }
}