sax/source/fastparser/fastparser.cxx |   10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

New commits:
commit bd394492c165d27c96a44495d9ca694a242acb8f
Author: Noel Grandin <noel.gran...@collabora.co.uk>
Date:   Wed Jul 11 09:58:30 2018 +0200

    tdf#79878 perf loading docx file, improve threading heuristic
    
    this gives another 2% perf
    
    Change-Id: Ia2983339f3f11daef37c48044904c8037a7a0bf6
    Reviewed-on: https://gerrit.libreoffice.org/57265
    Reviewed-by: Noel Grandin <noel.gran...@collabora.co.uk>
    Tested-by: Noel Grandin <noel.gran...@collabora.co.uk>

diff --git a/sax/source/fastparser/fastparser.cxx 
b/sax/source/fastparser/fastparser.cxx
index 72e42c1d0247..83b36d122f42 100644
--- a/sax/source/fastparser/fastparser.cxx
+++ b/sax/source/fastparser/fastparser.cxx
@@ -22,6 +22,7 @@
 #include <xml2utf.hxx>
 
 #include <com/sun/star/io/IOException.hpp>
+#include <com/sun/star/io/XSeekable.hpp>
 #include <com/sun/star/lang/DisposedException.hpp>
 #include <com/sun/star/lang/IllegalArgumentException.hpp>
 #include <com/sun/star/uno/XComponentContext.hpp>
@@ -780,8 +781,13 @@ void FastSaxParserImpl::parseStream(const InputSource& 
rStructSource)
         rEntity.mxDocumentHandler->startDocument();
     }
 
-    rEntity.mbEnableThreads = rEntity.maStructSource.aInputStream->available() 
> 10000
-        && !getenv("SAX_DISABLE_THREADS");
+    if (!getenv("SAX_DISABLE_THREADS"))
+    {
+        Reference<css::io::XSeekable> 
xSeekable(rEntity.maStructSource.aInputStream, UNO_QUERY);
+        // available() is not __really__ relevant here, but leave it in as a 
heuristic for non-seekable streams
+        rEntity.mbEnableThreads = (xSeekable.is() && xSeekable->getLength() > 
10000)
+                || (rEntity.maStructSource.aInputStream->available() > 10000);
+    }
 
     if (rEntity.mbEnableThreads)
     {
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