XMLWriter.php

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<?php
if (!defined('DATE_W3C')) {
  define('DATE_W3C', 'Y-m-d\TH:i:sP');
}

if (!defined('DEBUGMODE_ENABLED')) {
  define('DEBUGMODE_ENABLED', false);
}


class PHPExcel_Shared_XMLWriter extends XMLWriter {
        const STORAGE_MEMORY    = 1;
        const STORAGE_DISK              = 2;

        private $_tempFileName = '';

        public function __construct($pTemporaryStorage = self::STORAGE_MEMORY, $pTemporaryStorageFolder = './') {
                // Open temporary storage
                if ($pTemporaryStorage == self::STORAGE_MEMORY) {
                        $this->openMemory();
                } else {
                        // Create temporary filename
                        $this->_tempFileName = @tempnam($pTemporaryStorageFolder, 'xml');

                        // Open storage
                        if ($this->openUri($this->_tempFileName) === false) {
                                // Fallback to memory...
                                $this->openMemory();
                        }
                }

                // Set default values
                if (DEBUGMODE_ENABLED) {
                        $this->setIndent(true);
                }
        }

        public function __destruct() {
                // Unlink temporary files
                if ($this->_tempFileName != '') {
                        @unlink($this->_tempFileName);
                }
        }

        public function getData() {
                if ($this->_tempFileName == '') {
                        return $this->outputMemory(true);
                } else {
                        $this->flush();
                        return file_get_contents($this->_tempFileName);
                }
        }

        public function writeRawData($text)
        {
                if (method_exists($this, 'writeRaw')) {
                        return $this->writeRaw(htmlspecialchars($text));
                }

                return $this->text($text);
        }
}