diff --git a/.github/workflows/php.yml b/.github/workflows/php.yml
index 9902828..a1e5b36 100644
--- a/.github/workflows/php.yml
+++ b/.github/workflows/php.yml
@@ -75,7 +75,7 @@ jobs:
           with:
               php-version: ${{ matrix.php }}
               extensions: gd, xml, zip
-              coverage: xdebug
+              coverage: ${{ (matrix.php == '7.3') && 'xdebug' || 'none' }}
 
       -   name: Generate Locale (for tests)
           run: sudo locale-gen de_DE.UTF-8 && sudo update-locale
@@ -86,6 +86,11 @@ jobs:
           run: composer install --ansi --prefer-dist --no-interaction --no-progress
 
       -   name: Run phpunit
+          if: matrix.php != '7.3'
+          run: ./vendor/bin/phpunit -c phpunit.xml.dist --no-coverage
+
+      -   name: Run phpunit
+          if: matrix.php == '7.3'
           run: ./vendor/bin/phpunit -c phpunit.xml.dist --coverage-clover build/clover.xml
 
       -   name: Upload coverage results to Coveralls
diff --git a/README.md b/README.md
index 67e6878..83d878f 100644
--- a/README.md
+++ b/README.md
@@ -1,10 +1,9 @@
-[![Latest Stable Version](https://poser.pugx.org/phpoffice/common/v/stable.png)](https://packagist.org/packages/phpoffice/common)
-[![PHPOffice\Common](https://github.com/PHPOffice/Common/actions/workflows/php.yml/badge.svg)](https://github.com/PHPOffice/Common/actions/workflows/php.yml)
-[![Coverage Status](https://coveralls.io/repos/github/PHPOffice/Common/badge.svg?branch=develop)](https://coveralls.io/github/PHPOffice/Common?branch=develop)
-[![Total Downloads](https://poser.pugx.org/phpoffice/common/downloads.png)](https://packagist.org/packages/phpoffice/common)
-[![License](https://poser.pugx.org/phpoffice/common/license.png)](https://packagist.org/packages/phpoffice/common)
-[![Join the chat at https://gitter.im/PHPOffice/Common](https://img.shields.io/badge/GITTER-join%20chat-green.svg)](https://gitter.im/PHPOffice/Common)
+[![Latest Stable Version](https://poser.pugx.org/phpoffice/common/v)](https://packagist.org/packages/phpoffice/common)
+[![Coverage Status](https://coveralls.io/repos/github/PHPOffice/Common/badge.svg?branch=master)](https://coveralls.io/github/PHPOffice/Common?branch=master)
+[![Total Downloads](https://poser.pugx.org/phpoffice/common/downloads)](https://packagist.org/packages/phpoffice/common)
+[![License](https://poser.pugx.org/phpoffice/common/license)](https://packagist.org/packages/phpoffice/common)
 
+Branch Master : [![PHPOffice\Common](https://github.com/PHPOffice/Common/actions/workflows/php.yml/badge.svg?branch=master)](https://github.com/PHPOffice/Common/actions/workflows/php.yml)
 
 PHPOffice Common is a library written in pure PHP that provides a set of components for PHPOffice librairies. 
 
diff --git a/VERSION b/VERSION
index d81f1c3..e4c0d46 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-0.2.9
\ No newline at end of file
+1.0.3
\ No newline at end of file
diff --git a/src/Common/Adapter/Zip/PclZipAdapter.php b/src/Common/Adapter/Zip/PclZipAdapter.php
index 2ccca4e..c9dc1e9 100644
--- a/src/Common/Adapter/Zip/PclZipAdapter.php
+++ b/src/Common/Adapter/Zip/PclZipAdapter.php
@@ -27,7 +27,7 @@ public function close()
         return $this;
     }
 
-    public function addFromString($localname, $contents)
+    public function addFromString(string $localname, string $contents, bool $withCompression = true)
     {
         $pathData = pathinfo($localname);
 
@@ -35,7 +35,18 @@ public function addFromString($localname, $contents)
         fwrite($hFile, $contents);
         fclose($hFile);
 
-        $res = $this->oPclZip->add($this->tmpDir . '/' . $pathData['basename'], PCLZIP_OPT_REMOVE_PATH, $this->tmpDir, PCLZIP_OPT_ADD_PATH, $pathData['dirname']);
+        $params = [
+            $this->tmpDir . '/' . $pathData['basename'],
+            PCLZIP_OPT_REMOVE_PATH,
+            $this->tmpDir,
+            PCLZIP_OPT_ADD_PATH,
+            $pathData['dirname'],
+        ];
+        if (!$withCompression) {
+            $params[] = PCLZIP_OPT_NO_COMPRESSION;
+        }
+
+        $res = $this->oPclZip->add(...$params);
         if ($res == 0) {
             throw new \Exception('Error zipping files : ' . $this->oPclZip->errorInfo(true));
         }
diff --git a/src/Common/Adapter/Zip/ZipArchiveAdapter.php b/src/Common/Adapter/Zip/ZipArchiveAdapter.php
index 7636bf4..514a000 100644
--- a/src/Common/Adapter/Zip/ZipArchiveAdapter.php
+++ b/src/Common/Adapter/Zip/ZipArchiveAdapter.php
@@ -37,11 +37,14 @@ public function close()
         return $this;
     }
 
-    public function addFromString($localname, $contents)
+    public function addFromString(string $localname, string $contents, bool $withCompression = true)
     {
         if ($this->oZipArchive->addFromString($localname, $contents) === false) {
             throw new \Exception('Error zipping files : ' . $localname);
         }
+        if (!$withCompression) {
+            $this->oZipArchive->setCompressionName($localname, \ZipArchive::CM_STORE);
+        }
 
         return $this;
     }
diff --git a/src/Common/Adapter/Zip/ZipInterface.php b/src/Common/Adapter/Zip/ZipInterface.php
index 1e22790..c05888e 100644
--- a/src/Common/Adapter/Zip/ZipInterface.php
+++ b/src/Common/Adapter/Zip/ZipInterface.php
@@ -34,5 +34,5 @@ public function close();
      *
      * @throws \Exception
      */
-    public function addFromString($localname, $contents);
+    public function addFromString(string $localname, string $contents, bool $withCompression = true);
 }
diff --git a/src/Common/Microsoft/PasswordEncoder.php b/src/Common/Microsoft/PasswordEncoder.php
index a32d5af..192849d 100644
--- a/src/Common/Microsoft/PasswordEncoder.php
+++ b/src/Common/Microsoft/PasswordEncoder.php
@@ -114,7 +114,7 @@ class PasswordEncoder
      *
      * @return string
      */
-    public static function hashPassword(string $password, string $algorithmName = self::ALGORITHM_SHA_1, string $salt = null, int $spinCount = 10000)
+    public static function hashPassword(string $password, string $algorithmName = self::ALGORITHM_SHA_1, ?string $salt = null, int $spinCount = 10000)
     {
         $origEncoding = mb_internal_encoding();
         mb_internal_encoding('UTF-8');
diff --git a/src/Common/XMLReader.php b/src/Common/XMLReader.php
index abca427..1b43c0b 100644
--- a/src/Common/XMLReader.php
+++ b/src/Common/XMLReader.php
@@ -108,7 +108,7 @@ public function getDomFromString(string $content)
      *
      * @return \DOMNodeList<\DOMElement>
      */
-    public function getElements(string $path, \DOMElement $contextNode = null)
+    public function getElements(string $path, ?\DOMElement $contextNode = null)
     {
         if ($this->dom === null) {
             return new \DOMNodeList();
@@ -154,7 +154,7 @@ public function registerNamespace($prefix, $namespaceURI)
      *
      * @return \DOMElement|null
      */
-    public function getElement($path, \DOMElement $contextNode = null): ?\DOMElement
+    public function getElement($path, ?\DOMElement $contextNode = null): ?\DOMElement
     {
         $elements = $this->getElements($path, $contextNode);
         if ($elements->length > 0) {
@@ -173,7 +173,7 @@ public function getElement($path, \DOMElement $contextNode = null): ?\DOMElement
      *
      * @return string|null
      */
-    public function getAttribute($attribute, \DOMElement $contextNode = null, $path = null)
+    public function getAttribute($attribute, ?\DOMElement $contextNode = null, ?string $path = null)
     {
         $return = null;
         if ($path !== null) {
@@ -200,7 +200,7 @@ public function getAttribute($attribute, \DOMElement $contextNode = null, $path
      *
      * @return string|null
      */
-    public function getValue($path, \DOMElement $contextNode = null)
+    public function getValue($path, ?\DOMElement $contextNode = null)
     {
         $elements = $this->getElements($path, $contextNode);
         if ($elements->length > 0) {
@@ -218,7 +218,7 @@ public function getValue($path, \DOMElement $contextNode = null)
      *
      * @return int
      */
-    public function countElements($path, \DOMElement $contextNode = null)
+    public function countElements($path, ?\DOMElement $contextNode = null)
     {
         $elements = $this->getElements($path, $contextNode);
 
@@ -233,7 +233,7 @@ public function countElements($path, \DOMElement $contextNode = null)
      *
      * @return bool
      */
-    public function elementExists($path, \DOMElement $contextNode = null)
+    public function elementExists($path, ?\DOMElement $contextNode = null)
     {
         return $this->getElements($path, $contextNode)->length > 0;
     }
diff --git a/src/Common/XMLWriter.php b/src/Common/XMLWriter.php
index 511022a..80aed37 100644
--- a/src/Common/XMLWriter.php
+++ b/src/Common/XMLWriter.php
@@ -53,7 +53,7 @@ class XMLWriter extends \XMLWriter
      * @param string $pTemporaryStorageDir Temporary storage folder
      * @param bool $compatibility
      */
-    public function __construct($pTemporaryStorage = self::STORAGE_MEMORY, $pTemporaryStorageDir = null, $compatibility = false)
+    public function __construct(int $pTemporaryStorage = self::STORAGE_MEMORY, ?string $pTemporaryStorageDir = null, bool $compatibility = false)
     {
         // Open temporary storage
         if ($pTemporaryStorage == self::STORAGE_MEMORY) {
@@ -121,7 +121,7 @@ public function getData()
      *
      * @return void
      */
-    public function writeElementBlock(string $element, $attributes, string $value = null)
+    public function writeElementBlock(string $element, $attributes, ?string $value = null)
     {
         $this->startElement($element);
         if (!is_array($attributes)) {
@@ -143,7 +143,7 @@ public function writeElementBlock(string $element, $attributes, string $value =
      *
      * @return void
      */
-    public function writeElementIf(bool $condition, string $element, string $attribute = null, $value = null)
+    public function writeElementIf(bool $condition, string $element, ?string $attribute = null, $value = null)
     {
         if ($condition) {
             if (is_null($attribute)) {
diff --git a/tests/Common/Tests/Adapter/Zip/AbstractZipAdapter.php b/tests/Common/Tests/Adapter/Zip/AbstractZipAdapter.php
index af34b8c..955552b 100644
--- a/tests/Common/Tests/Adapter/Zip/AbstractZipAdapter.php
+++ b/tests/Common/Tests/Adapter/Zip/AbstractZipAdapter.php
@@ -15,7 +15,7 @@ abstract class AbstractZipAdapter extends \PHPUnit\Framework\TestCase
     /**
      * Returns a new instance of the adapter to test
      *
-     * @return \PhpOffice\Common\Adapter\Zip\ZipInterface
+     * @return ZipInterface
      */
     abstract protected function createAdapter(): ZipInterface;
 
@@ -50,17 +50,43 @@ public function testClose(): void
         $this->assertSame($adapter, $adapter->close());
     }
 
-    public function testAddFromString(): void
+    public function testAddFromStringWithCompression(): void
     {
-        $expectedPath = 'file.test';
-        $expectedContent = 'Content';
+        $expectedPath = 'file.png';
+        $expectedContent = file_get_contents(
+            PHPOFFICE_COMMON_TESTS_BASE_DIR
+            . DIRECTORY_SEPARATOR . 'resources'
+            . DIRECTORY_SEPARATOR . 'images'
+            . DIRECTORY_SEPARATOR . 'PHPPowerPointLogo.png'
+        );
 
         $adapter = $this->createAdapter();
         $adapter->open($this->zipTest);
-        $this->assertSame($adapter, $adapter->addFromString($expectedPath, $expectedContent));
+        $this->assertSame($adapter, $adapter->addFromString($expectedPath, $expectedContent, true));
         $adapter->close();
 
         $this->assertTrue(TestHelperZip::assertFileExists($this->zipTest, $expectedPath));
+        $this->assertTrue(TestHelperZip::assertFileIsCompressed($this->zipTest, $expectedPath));
+        $this->assertTrue(TestHelperZip::assertFileContent($this->zipTest, $expectedPath, $expectedContent));
+    }
+
+    public function testAddFromStringWithNoCompression(): void
+    {
+        $expectedPath = 'file.png';
+        $expectedContent = file_get_contents(
+            PHPOFFICE_COMMON_TESTS_BASE_DIR
+            . DIRECTORY_SEPARATOR . 'resources'
+            . DIRECTORY_SEPARATOR . 'images'
+            . DIRECTORY_SEPARATOR . 'PHPPowerPointLogo.png'
+        );
+
+        $adapter = $this->createAdapter();
+        $adapter->open($this->zipTest);
+        $this->assertSame($adapter, $adapter->addFromString($expectedPath, $expectedContent, false));
+        $adapter->close();
+
+        $this->assertTrue(TestHelperZip::assertFileExists($this->zipTest, $expectedPath));
+        $this->assertFalse(TestHelperZip::assertFileIsCompressed($this->zipTest, $expectedPath));
         $this->assertTrue(TestHelperZip::assertFileContent($this->zipTest, $expectedPath, $expectedContent));
     }
 }
diff --git a/tests/Common/Tests/_includes/TestHelperZip.php b/tests/Common/Tests/_includes/TestHelperZip.php
index dc78e81..a2bd8b2 100644
--- a/tests/Common/Tests/_includes/TestHelperZip.php
+++ b/tests/Common/Tests/_includes/TestHelperZip.php
@@ -33,4 +33,16 @@ public static function assertFileContent(string $fileZip, string $path, string $
 
         return true;
     }
+
+    public static function assertFileIsCompressed(string $fileZip, string $path): bool
+    {
+        $oZip = new \ZipArchive();
+        $oZip->open($fileZip);
+        $stat = $oZip->statName($path);
+
+        // size: uncompressed
+        // comp_size: compressed
+
+        return $stat['size'] > $stat['comp_size'];
+    }
 }
diff --git a/tests/bootstrap.php b/tests/bootstrap.php
index 24dd4a8..6b00a00 100644
--- a/tests/bootstrap.php
+++ b/tests/bootstrap.php
@@ -49,4 +49,4 @@
 });
 
 require_once __DIR__ . '/../src/Common/Autoloader.php';
-\PhpOffice\Common\Autoloader::register();
+PhpOffice\Common\Autoloader::register();