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diff --git a/ucb/source/ucp/image/ucpimage.cxx b/ucb/source/ucp/image/ucpimage.cxx
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+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * 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/.
+ */
+
+#include <sal/config.h>
+
+#include <cassert>
+
+#include <com/sun/star/lang/XServiceInfo.hpp>
+#include <com/sun/star/ucb/IllegalIdentifierException.hpp>
+#include <com/sun/star/ucb/XContentProvider.hpp>
+#include <com/sun/star/uno/XComponentContext.hpp>
+#include <com/sun/star/uri/UriReferenceFactory.hpp>
+#include <comphelper/compbase.hxx>
+#include <cppuhelper/supportsservice.hxx>
+#include <rtl/uri.hxx>
+#include <rtl/ustrbuf.hxx>
+#include <vcl/ImageTree.hxx>
+#include <vcl/svapp.hxx>
+#include <ucbhelper/content.hxx>
+
+// A LO-private ("implementation detail") UCP used to access images from help
+// content, with theme fallback and localization support as provided by VCL's
+// ImageTree.
+//
+// The URL scheme is
+//
+// "vnd.libreoffice.image://"<theme><path>["?lang="<language-tag>]
+
+namespace {
+
+class Provider final:
+ public comphelper::WeakComponentImplHelper<
+ css::lang::XServiceInfo, css::ucb::XContentProvider>
+{
+public:
+ explicit Provider(
+ css::uno::Reference<css::uno::XComponentContext> const & context):
+ context_(context)
+ {}
+
+private:
+ OUString SAL_CALL getImplementationName() override
+ { return "com.sun.star.comp.ucb.ImageContentProvider"; }
+
+ sal_Bool SAL_CALL supportsService(OUString const & ServiceName) override
+ { return cppu::supportsService(this, ServiceName); }
+
+ css::uno::Sequence<OUString> SAL_CALL getSupportedServiceNames() override
+ {
+ return css::uno::Sequence<OUString>{
+ "com.sun.star.ucb.ImageContentProvider"};
+ }
+
+ css::uno::Reference<css::ucb::XContent> SAL_CALL queryContent(
+ css::uno::Reference<css::ucb::XContentIdentifier> const & Identifier)
+ override
+ {
+ css::uno::Reference<css::uno::XComponentContext> context;
+ {
+ std::unique_lock g(m_aMutex);
+ context = context_;
+ }
+ if (!context.is()) {
+ throw css::lang::DisposedException();
+ }
+ auto url(Identifier->getContentIdentifier());
+ auto uri(css::uri::UriReferenceFactory::create(context)->parse(url));
+ if (!(uri.is()
+ && uri->getScheme().equalsIgnoreAsciiCase(
+ "vnd.libreoffice.image")))
+ {
+ throw css::ucb::IllegalIdentifierException(url);
+ }
+ auto auth(
+ rtl::Uri::decode(
+ uri->getAuthority(), rtl_UriDecodeStrict,
+ RTL_TEXTENCODING_UTF8));
+ if (auth.isEmpty()) {
+ throw css::ucb::IllegalIdentifierException(url);
+ }
+ auto path(uri->getPath());
+ if (path.isEmpty()) {
+ throw css::ucb::IllegalIdentifierException(url);
+ }
+ OUStringBuffer buf;
+ assert(path[0] == '/');
+ for (sal_Int32 i = 1;;) {
+ auto j = path.indexOf('/', i);
+ if (j == -1) {
+ j = path.getLength();
+ }
+ auto seg(
+ rtl::Uri::decode(
+ path.copy(i, j - i), rtl_UriDecodeStrict,
+ RTL_TEXTENCODING_UTF8));
+ if (seg.isEmpty()) {
+ throw css::ucb::IllegalIdentifierException(url);
+ }
+ if (i != 1) {
+ buf.append('/');
+ }
+ buf.append(seg);
+ if (j == path.getLength()) {
+ break;
+ }
+ i = j + 1;
+ }
+ auto decPath(buf.makeStringAndClear());
+ OUString lang;
+ if (uri->hasQuery()) {
+ if (!uri->getQuery().startsWith("lang=", &lang)) {
+ throw css::ucb::IllegalIdentifierException(url);
+ }
+ lang = rtl::Uri::decode(
+ lang, rtl_UriDecodeStrict, RTL_TEXTENCODING_UTF8);
+ if (lang.isEmpty()) {
+ throw css::ucb::IllegalIdentifierException(url);
+ }
+ }
+ OUString newUrl;
+ {
+ SolarMutexGuard g;
+ newUrl = ImageTree::get().getImageUrl(decPath, auth, lang);
+ }
+ ucbhelper::Content content;
+ return
+ ucbhelper::Content::create(
+ newUrl, css::uno::Reference<css::ucb::XCommandEnvironment>(),
+ context, content)
+ ? content.get() : css::uno::Reference<css::ucb::XContent>();
+ }
+
+ sal_Int32 SAL_CALL compareContentIds(
+ css::uno::Reference<css::ucb::XContentIdentifier> const & Id1,
+ css::uno::Reference<css::ucb::XContentIdentifier> const & Id2) override
+ {
+ return Id1->getContentIdentifier().compareTo(
+ Id2->getContentIdentifier());
+ }
+
+ void disposing(std::unique_lock<std::mutex>&) override {
+ context_.clear();
+ }
+
+ css::uno::Reference<css::uno::XComponentContext> context_;
+};
+
+}
+
+extern "C" SAL_DLLPUBLIC_EXPORT css::uno::XInterface *
+com_sun_star_comp_ucb_ImageContentProvider_get_implementation(
+ css::uno::XComponentContext * context,
+ css::uno::Sequence<css::uno::Any> const &)
+{
+ return cppu::acquire(new Provider(context));
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */