1 files changed, 4 insertions, 0 deletions

diff --git a/src/deflate.cpp b/src/deflate.cpp
index 2d925a7..704d172 100644
--- a/src/deflate.cpp
+++ b/src/deflate.cpp
@@ -123,6 +123,8 @@ void Bu::Deflate::zError( int code )
 Bu::size Bu::Deflate::read( void *pData, Bu::size nBytes )
 {
         TRACE( pData, nBytes );
+        if( nBytes  <= 0 )
+                return 0;
         if( !pState->state )
         {
                 bReading = true;
@@ -191,6 +193,8 @@ Bu::size Bu::Deflate::read( void *pData, Bu::size nBytes )
 Bu::size Bu::Deflate::write( const void *pData, Bu::size nBytes )
 {
         TRACE( pData, nBytes );
+        if( nBytes  <= 0 )
+                return 0;
         if( !pState->state )
         {
                 bReading = false;