fastparser: don't allocate uno::Sequences when we don't need to.

Change-Id: Ic2fff8cabbc077b6fc9dabffd2c6fcf555152b11

2 files changed, 26 insertions, 5 deletions

diff --git a/sax/source/fastparser/fastparser.cxx b/sax/source/fastparser/fastparser.cxx
index 34779968fd4b..6b793db1793e 100644
--- a/sax/source/fastparser/fastparser.cxx
+++ b/sax/source/fastparser/fastparser.cxx
@@ -201,6 +201,7 @@ Entity::~Entity()
 FastSaxParser::FastSaxParser()
 {
     mxDocumentLocator.set( new FastLocatorImpl( this ) );
+    maUtf8Buffer.realloc( mnUtf8BufferSize );
 }
 
 // --------------------------------------------------------------------
@@ -259,19 +260,36 @@ void FastSaxParser::DefineNamespace( const OString& rPrefix, const sal_Char* pNa
 
 sal_Int32 FastSaxParser::GetToken( const OString& rToken )
 {
-    Sequence< sal_Int8 > aSeq( (sal_Int8*)rToken.getStr(), rToken.getLength() );
-
-    return getEntity().mxTokenHandler->getTokenFromUTF8( aSeq );
+    return GetToken( rToken.getStr(), rToken.getLength() );
 }
 
 sal_Int32 FastSaxParser::GetToken( const sal_Char* pToken, sal_Int32 nLen /* = 0 */ )
 {
+    sal_Int32 nRet;
+
     if( !nLen )
         nLen = strlen( pToken );
 
-    Sequence< sal_Int8 > aSeq( (sal_Int8*)pToken, nLen );
+    if ( nLen < mnUtf8BufferSize )
+    {
+        // Get intimiate with the underlying sequence cf. sal/types.h
+        sal_Sequence *pSeq = maUtf8Buffer.get();
+
+        sal_Int32 nPreRefCount = pSeq->nRefCount;
+
+        pSeq->nElements = nLen;
+        memcpy( pSeq->elements, pToken, nLen );
+        nRet = getEntity().mxTokenHandler->getTokenFromUTF8( maUtf8Buffer );
 
-    return getEntity().mxTokenHandler->getTokenFromUTF8( aSeq );
+        (void)nPreRefCount; // for non-debug mode.
+        assert( pSeq->nRefCount == nPreRefCount ); // callee must not take ref.
+    }
+    else
+    {
+        Sequence< sal_Int8 > aSeq( (sal_Int8*)pToken, nLen ); // heap allocate & free
+        nRet = getEntity().mxTokenHandler->getTokenFromUTF8( aSeq );
+    }
+    return nRet;
 }
 
 // --------------------------------------------------------------------
diff --git a/sax/source/fastparser/fastparser.hxx b/sax/source/fastparser/fastparser.hxx
index dab438f81422..e75ee0f0a596 100644
--- a/sax/source/fastparser/fastparser.hxx
+++ b/sax/source/fastparser/fastparser.hxx
@@ -154,6 +154,9 @@ private:
 
     ParserData maData;                      /// Cached parser configuration for next call of parseStream().
     ::std::stack< Entity > maEntities;      /// Entity stack for each call of parseStream().
+
+    static const int mnUtf8BufferSize = 128;
+    ::css::uno::Sequence< sal_Int8 > maUtf8Buffer; /// avoid constantly re-allocating this
 };
 
 }