--- a/src/org/tmatesoft/hg/internal/DataAccessProvider.java	Thu Oct 18 18:36:13 2012 +0200
+++ b/src/org/tmatesoft/hg/internal/DataAccessProvider.java	Thu Oct 18 19:51:07 2012 +0200
@@ -55,18 +55,23 @@
 	public DataAccessProvider(SessionContext ctx) {
 		context = ctx;
 		PropertyMarshal pm = new PropertyMarshal(ctx);
-		mapioMagicBoundary = pm.getInt(CFG_PROPERTY_MAPIO_LIMIT, DEFAULT_MAPIO_LIMIT);
+		mapioMagicBoundary = mapioBoundaryValue(pm.getInt(CFG_PROPERTY_MAPIO_LIMIT, DEFAULT_MAPIO_LIMIT));
 		bufferSize = pm.getInt(CFG_PROPERTY_FILE_BUFFER_SIZE, DEFAULT_FILE_BUFFER);
 		mapioBufSize = pm.getInt(CFG_PROPERTY_MAPIO_BUFFER_SIZE, DEFAULT_MAPIO_BUFFER);
 	}
 	
 	public DataAccessProvider(SessionContext ctx, int mapioBoundary, int regularBufferSize, int mapioBufferSize) {
 		context = ctx;
-		mapioMagicBoundary = mapioBoundary == 0 ? Integer.MAX_VALUE : mapioBoundary;
+		mapioMagicBoundary = mapioBoundaryValue(mapioBoundary);
 		bufferSize = regularBufferSize;
 		mapioBufSize = mapioBufferSize;
 	}
 
+	// ensure contract of CFG_PROPERTY_MAPIO_LIMIT, for mapioBoundary == 0 use MAX_VALUE so that no file is memmap-ed
+	private static int mapioBoundaryValue(int mapioBoundary) {
+		return mapioBoundary == 0 ? Integer.MAX_VALUE : mapioBoundary;
+	}
+
 	public DataAccess create(File f) {
 		if (!f.exists()) {
 			return new DataAccess();