Add a '& 0xFF' on converting bytes to integers as bytes are signed Fixes

 #4

src/main/java/org/purejava/MapEntries.java

@@ -15,7 +15,7 @@
  */
 public class MapEntries {
 
-    private Logger log = LoggerFactory.getLogger(MapEntries.class);
+    private final Logger log = LoggerFactory.getLogger(MapEntries.class);
     private Map<String, String> map = new HashMap<>();
     private final byte[] EMPTY_ENTRY = new byte[]{-1, -1, -1, -1};
     private final byte[] EMPTY_VALUE = new byte[]{0, 0, 0, 0};
@@ -154,7 +154,7 @@ public boolean setByteField(byte[] s) {
         try (var b = new ByteArrayInputStream(s);
              var x = new DataInputStream(b)) {
 
-            var mapSize = x.readInt();
+            var mapSize = x.readInt() & 0xFF;
 
             for (var i = 0; i < mapSize; i++) {
                 // check if the mext part is a number or an EMPTY_ENTRY
@@ -200,7 +200,7 @@ public boolean setByteField(byte[] s) {
     }
 
     private int fourBytesToInt(byte[] b) {
-        return ((b[0] << 24) + (b[1] << 16) + (b[2] << 8) + (b[3] << 0));
+        return ((b[0] << 24) + (b[1] << 16) + (b[2] << 8) + (b[3] << 0)) & 0xFF;
     }
 
     @Override

src/test/java/org/purejava/KDEWalletTest2.java

@@ -6,6 +6,8 @@
 import org.slf4j.LoggerFactory;
 
 import java.util.List;
+import java.util.stream.Collectors;
+import java.util.stream.Stream;
 
 import static org.junit.jupiter.api.Assertions.*;
 
@@ -93,6 +95,15 @@ void testWriteEntry() {
         result = (int) response[0];
         assertEquals(result, 0);
         if (result == 0) log.info("Map with with key '{}' successfully updated in folder '{}'.", key2, folder);
+        var longString = Stream.iterate("A", s -> s).limit(64).collect(Collectors.joining());
+        me.storeEntry("E", longString);
+        response = kwallet.send("writeEntry", "issayis", handle, folder, key2, me.getByteField(), 3, appid);
+        result = (int) response[0];
+        assertEquals(result, 0);
+        response = kwallet.send("readMap", "isss", handle, folder, key2, appid);
+        me.setByteField((byte[]) response[0]);
+        assertTrue(me.hasValue("E", longString));
+        log.info("Successfully stored and retrieved value '{}' with a length gt 63.", me.getValue("E"));
         var newName = "newName";
         response = kwallet.send("renameEntry", "issss", handle, folder, key1, newName, appid);
         var renaming = (int) response[0];