Make fallback content types case-insensitive

2 files changed, 8 insertions, 1 deletions

diff --git a/lib/docx/content-types-reader.js b/lib/docx/content-types-reader.js
index fc95771..5364b87 100644
--- a/lib/docx/content-types-reader.js
+++ b/lib/docx/content-types-reader.js
@@ -44,7 +44,7 @@ function contentTypes(overrides, extensionDefaults) {
                 if (extensionDefaults.hasOwnProperty(extension)) {
                     return extensionDefaults[extension];
                 } else {
-                    var fallback = fallbackContentTypes[extension];
+                    var fallback = fallbackContentTypes[extension.toLowerCase()];
                     if (fallback) {
                         return "image/" + fallback;
                     } else {
diff --git a/tests/docx/content-types-reader.tests.js b/tests/docx/content-types-reader.tests.js
index 3390e43..a223d09 100644
--- a/tests/docx/content-types-reader.tests.js
+++ b/tests/docx/content-types-reader.tests.js
@@ -37,4 +37,11 @@ describe('readContentTypesFromXml', function() {
         assert.equal(contentTypes.findContentType("word/media/hat.tif"), "image/tiff");
         assert.equal(contentTypes.findContentType("word/media/hat.tiff"), "image/tiff");
     });
+    
+    test('fallback content types are case insensitive on extension', function() {
+        var contentTypes = readContentTypesFromXml({
+            root: new XmlElement("content-types:Types", {}, [])
+        });
+        assert.equal(contentTypes.findContentType("word/media/hat.PnG"), "image/png");
+    });
 });