tdf#113696 Add mimetype to image element

Otherwise browsers don't recognize base64 encoded svg files.

Change-Id: I54d0b87c52a1ca9da1d820751ae32159b88ed28f

2 files changed, 106 insertions, 0 deletions

diff --git a/comphelper/Library_comphelper.mk b/comphelper/Library_comphelper.mk
index 4d4e7345298d..c267711126da 100644
--- a/comphelper/Library_comphelper.mk
+++ b/comphelper/Library_comphelper.mk
@@ -91,6 +91,7 @@ $(eval $(call gb_Library_add_exception_objects,comphelper,\
     comphelper/source/misc/evtmethodhelper \
     comphelper/source/misc/fileurl \
     comphelper/source/misc/getexpandeduri \
+    comphelper/source/misc/graphicmimetype \
     comphelper/source/misc/instancelocker \
     comphelper/source/misc/interaction \
     comphelper/source/misc/listenernotification \
diff --git a/comphelper/source/misc/graphicmimetype.cxx b/comphelper/source/misc/graphicmimetype.cxx
new file mode 100644
index 000000000000..bf88312304b1
--- /dev/null
+++ b/comphelper/source/misc/graphicmimetype.cxx
@@ -0,0 +1,105 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4; fill-column: 100 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you 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 .
+ */
+
+#include <comphelper/graphicmimetype.hxx>
+
+#include <com/sun/star/beans/XPropertySet.hpp>
+#include <com/sun/star/beans/PropertyValue.hpp>
+#include <com/sun/star/graphic/GraphicProvider.hpp>
+#include <com/sun/star/graphic/XGraphicProvider.hpp>
+#include <com/sun/star/io/XInputStream.hpp>
+#include <com/sun/star/graphic/XGraphic.hpp>
+#include <com/sun/star/uno/Reference.hxx>
+
+#include <comphelper/processfactory.hxx>
+
+using namespace css;
+using namespace css::beans;
+using namespace css::graphic;
+using namespace css::io;
+using namespace css::uno;
+
+namespace comphelper
+{
+OUString GraphicMimeTypeHelper::GetMimeTypeForExtension(const OString& rExt)
+{
+    struct XMLGraphicMimeTypeMapper
+    {
+        const char* pExt;
+        const char* pMimeType;
+    };
+
+    static const XMLGraphicMimeTypeMapper aMapper[]
+        = { { "gif", "image/gif" },   { "png", "image/png" },     { "jpg", "image/jpeg" },
+            { "tif", "image/tiff" },  { "svg", "image/svg+xml" }, { "pdf", "application/pdf" },
+            { "wmf", "image/x-wmf" }, { "eps", "image/x-eps" },   { "bmp", "image/bmp" },
+            { "pct", "image/x-pict" } };
+
+    OUString aMimeType;
+
+    long const nCount = SAL_N_ELEMENTS(aMapper);
+    for (long i = 0; (i < nCount) && aMimeType.isEmpty(); ++i)
+    {
+        if (rExt == aMapper[i].pExt)
+            aMimeType = OUString(aMapper[i].pMimeType, strlen(aMapper[i].pMimeType),
+                                 RTL_TEXTENCODING_ASCII_US);
+    }
+
+    return aMimeType;
+}
+
+OUString GraphicMimeTypeHelper::GetMimeTypeForXGraphic(Reference<XGraphic> xGraphic)
+{
+    OUString aSourceMimeType;
+    Reference<XPropertySet> const xGraphicPropertySet(xGraphic, UNO_QUERY);
+    if (xGraphicPropertySet.is() && // it's null if it's an external link
+        (xGraphicPropertySet->getPropertyValue("MimeType") >>= aSourceMimeType))
+    {
+        return aSourceMimeType;
+    }
+    return OUString("");
+}
+
+OUString GraphicMimeTypeHelper::GetMimeTypeForImageUrl(const OUString& rImageUrl)
+{
+    // Create the graphic to retrieve the mimetype from it
+    Reference<XGraphicProvider> xProvider
+        = css::graphic::GraphicProvider::create(comphelper::getProcessComponentContext());
+    Sequence<PropertyValue> aMediaProperties(1);
+    aMediaProperties[0].Name = "URL";
+    aMediaProperties[0].Value <<= rImageUrl;
+    Reference<XGraphic> xGraphic(xProvider->queryGraphic(aMediaProperties));
+
+    return GetMimeTypeForXGraphic(xGraphic);
+}
+
+OUString GraphicMimeTypeHelper::GetMimeTypeForImageStream(Reference<XInputStream> xInputStream)
+{
+    // Create the graphic to retrieve the mimetype from it
+    Reference<XGraphicProvider> xProvider
+        = css::graphic::GraphicProvider::create(comphelper::getProcessComponentContext());
+    Sequence<PropertyValue> aMediaProperties(1);
+    aMediaProperties[0].Name = "InputStream";
+    aMediaProperties[0].Value <<= xInputStream;
+    Reference<XGraphic> xGraphic(xProvider->queryGraphic(aMediaProperties));
+
+    return GetMimeTypeForXGraphic(xGraphic);
+}
+}
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */