Related rhbz#1259746: Buffer file content read from GIO UCP

...for one, this avoids sending seek requests down the GIO/GVFS stack, which can
silently fail with corrupt data read from certain broken servers for current
versions of the GIO/GVFS stack; for another, it should considerably speed up
loading documents via the GIO UCP, as LO's document type detection is notorious
for issuing lots of seek and (small-chunk and/or re-) read operations on a file.

(This issue has become more relevant after
51e0d789c344547956764c3b5f0ef5a304f4e0aa "rhbz#1134285: Access dav, davs URLs
via GVFS," where the old route via the WebDAV UCP was apparently not affected by
those broken servers, so happened to start affecting opening certain remote
files in LO via Nautilus.)

Change-Id: I91f91128b2d1a16f976eafeacf216a91747f4df1
(cherry picked from commit 93a0696e74e96e5a5ca821f33cb791b87e876f49)
Reviewed-on: https://gerrit.libreoffice.org/18612
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>

3 files changed, 13 insertions, 35 deletions

diff --git a/ucb/source/ucp/gio/gio_content.cxx b/ucb/source/ucp/gio/gio_content.cxx
index 96c7c4b96f2f..6a432f802ee5 100644
--- a/ucb/source/ucp/gio/gio_content.cxx
+++ b/ucb/source/ucp/gio/gio_content.cxx
@@ -59,6 +59,7 @@
 #include <com/sun/star/ucb/XContentCreator.hpp>
 
 #include <comphelper/processfactory.hxx>
+#include <comphelper/seekableinput.hxx>
 #include <cppuhelper/exc_hlp.hxx>
 #include <ucbhelper/contentidentifier.hxx>
 #include <ucbhelper/propertyvalueset.hxx>
@@ -846,9 +847,9 @@ bool Content::feedSink( uno::Reference< uno::XInterface > xSink,
     if (!pStream)
        convertToException(pError, static_cast< cppu::OWeakObject * >(this));
 
-    uno::Reference< io::XInputStream > xIn = new ::gio::InputStream(pStream);
-    if ( !xIn.is() )
-        return false;
+    uno::Reference< io::XInputStream > xIn(
+        new comphelper::OSeekableInputWrapper(
+            new ::gio::InputStream(pStream), m_xContext));
 
     if ( xOut.is() )
         copyData( xIn, xOut );
diff --git a/ucb/source/ucp/gio/gio_inputstream.cxx b/ucb/source/ucp/gio/gio_inputstream.cxx
index 6d11bc325043..e2c19e195b27 100644
--- a/ucb/source/ucp/gio/gio_inputstream.cxx
+++ b/ucb/source/ucp/gio/gio_inputstream.cxx
@@ -29,7 +29,7 @@ using namespace com::sun::star;
 namespace gio
 {
 
-InputStream::InputStream(GFileInputStream *pStream) : Seekable(G_SEEKABLE(pStream)), mpStream(pStream)
+InputStream::InputStream(GFileInputStream *pStream): mpStream(pStream)
 {
     if (!mpStream)
         throw io::NotConnectedException();
@@ -57,16 +57,11 @@ void SAL_CALL InputStream::skipBytes( sal_Int32 nBytesToSkip )
     throw( io::NotConnectedException, io::BufferSizeExceededException,
       io::IOException, uno::RuntimeException, std::exception )
 {
-    if (!mpStream)
-        throw io::NotConnectedException();
-
-    if (!g_seekable_can_seek(G_SEEKABLE(mpStream)))
-        throw io::IOException("Seek unsupported",
-            static_cast< cppu::OWeakObject * >(this));
-
-    GError *pError=NULL;
-    if (!g_seekable_seek(G_SEEKABLE(mpStream), nBytesToSkip, G_SEEK_CUR, NULL, &pError))
-        convertToIOException(pError, static_cast< cppu::OWeakObject * >(this));
+    // Conservatively call readBytes and discard the read data, but given this
+    // InputStream will always be wrapped in comphelper::OSeekableInputWrapper,
+    // this function will never be called anyway:
+    css::uno::Sequence<sal_Int8> data;
+    readBytes(data, nBytesToSkip);
 }
 
 sal_Int32 SAL_CALL InputStream::readBytes( uno::Sequence< sal_Int8 >& aData, sal_Int32 nBytesToRead )
@@ -100,14 +95,6 @@ sal_Int32 SAL_CALL InputStream::readSomeBytes( uno::Sequence< sal_Int8 >& aData,
     return readBytes(aData, nMaxBytesToRead);
 }
 
-uno::Any InputStream::queryInterface( const uno::Type &type ) throw( uno::RuntimeException, std::exception )
-{
-    uno::Any aRet = ::cppu::queryInterface ( type,
-        static_cast< XInputStream * >( this ) );
-
-    return aRet.hasValue() ? aRet : Seekable::queryInterface( type );
-}
-
 }
 
 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/ucb/source/ucp/gio/gio_inputstream.hxx b/ucb/source/ucp/gio/gio_inputstream.hxx
index bb821f2e004e..24dea0137de5 100644
--- a/ucb/source/ucp/gio/gio_inputstream.hxx
+++ b/ucb/source/ucp/gio/gio_inputstream.hxx
@@ -22,20 +22,16 @@
 
 #include <sal/types.h>
 #include <rtl/ustring.hxx>
-#include <cppuhelper/weak.hxx>
+#include <cppuhelper/implbase.hxx>
 
 #include <com/sun/star/io/XInputStream.hpp>
-#include <com/sun/star/io/XTruncate.hpp>
-#include <com/sun/star/io/XSeekable.hpp>
 
-#include "gio_seekable.hxx"
+#include <gio/gio.h>
 
 namespace gio
 {
 
-class InputStream :
-    public ::com::sun::star::io::XInputStream,
-    public Seekable
+class InputStream: public cppu::WeakImplHelper<css::io::XInputStream>
 {
 private:
     GFileInputStream *mpStream;
@@ -44,12 +40,6 @@ public:
     InputStream ( GFileInputStream *pStream );
     virtual ~InputStream();
 
-    // XInterface
-    virtual com::sun::star::uno::Any SAL_CALL queryInterface(const ::com::sun::star::uno::Type & type )
-            throw( ::com::sun::star::uno::RuntimeException, std::exception ) SAL_OVERRIDE;
-    virtual void SAL_CALL acquire() throw () SAL_OVERRIDE { OWeakObject::acquire(); }
-    virtual void SAL_CALL release() throw() SAL_OVERRIDE { OWeakObject::release(); }
-
     // XInputStream
     virtual sal_Int32 SAL_CALL readBytes( ::com::sun::star::uno::Sequence< sal_Int8 > & aData,
         sal_Int32 nBytesToRead )