Fix issue with directory separators for zip:// on Windows

Replaced "/" by DIRECTORY_SEPARATOR every time it was used with zip://

src/Spout/Reader/Helper/XLSX/SharedStringsHelper.php

@@ -93,7 +93,7 @@ class SharedStringsHelper
         $this->tempFilePointer = null;
         $escaper = new \Box\Spout\Common\Escaper\XLSX();
 
-        $sharedStringsFilePath = 'zip://' . $this->filePath . '#' . self::SHARED_STRINGS_XML_FILE_PATH;
+        $sharedStringsFilePath = $this->getSharedStringsFilePath();
         if ($xmlReader->open($sharedStringsFilePath, null, LIBXML_NONET) === false) {
             throw new IOException('Could not open "' . self::SHARED_STRINGS_XML_FILE_PATH . '".');
         }
@@ -143,6 +143,15 @@ class SharedStringsHelper
         $xmlReader->close();
     }
 
+    /**
+     * @return string The path to the shared strings XML file, working cross-platforms
+     */
+    protected function getSharedStringsFilePath()
+    {
+        $sharedStringsXmlFilePath = str_replace('/', DIRECTORY_SEPARATOR, self::SHARED_STRINGS_XML_FILE_PATH);
+        return 'zip://' . $this->filePath . '#' . $sharedStringsXmlFilePath;
+    }
+
     /**
      * Removes nodes that should not be read, like the pronunciation of the Kanji characters.
      * By keeping them, their text content would be added to the read string.

src/Spout/Reader/Helper/XLSX/WorksheetHelper.php

@@ -186,7 +186,8 @@ class WorksheetHelper
      */
     protected function getFileAsXMLElementWithNamespace($xmlFilePath, $mainNamespace)
     {
-        $xmlContents = $this->globalFunctionsHelper->file_get_contents('zip://' . $this->filePath . '#' . $xmlFilePath);
+        $normalizedXmlFilePath = str_replace('/', DIRECTORY_SEPARATOR, $xmlFilePath);
+        $xmlContents = $this->globalFunctionsHelper->file_get_contents('zip://' . $this->filePath . '#' . $normalizedXmlFilePath);
 
         $xmlElement = new \SimpleXMLElement($xmlContents);
         $xmlElement->registerXPathNamespace('ns', $mainNamespace);

src/Spout/Reader/Internal/XLSX/Worksheet.php

@@ -32,11 +32,13 @@ class Worksheet
     }
 
     /**
-     * @return string Path of the XML file containing the worksheet data, without the leading slash
+     * @return string Path of the XML file containing the worksheet data,
+     *                without the leading slash and working cross-platforms.
      */
     public function getDataXmlFilePath()
     {
-        return ltrim($this->dataXmlFilePath, '/');
+        $dataXmlFilePath = ltrim($this->dataXmlFilePath, '/');
+        return str_replace('/', DIRECTORY_SEPARATOR, $dataXmlFilePath);
     }
 
     /**