Index: lucene/contrib/misc/src/test/org/apache/lucene/misc/TestShortFieldSimilarity.java
===================================================================
--- lucene/contrib/misc/src/test/org/apache/lucene/misc/TestShortFieldSimilarity.java	(revision 0)
+++ lucene/contrib/misc/src/test/org/apache/lucene/misc/TestShortFieldSimilarity.java	(revision 0)
@@ -0,0 +1,38 @@
+package org.apache.lucene.misc;
+
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import org.apache.lucene.index.FieldInvertState;
+import org.apache.lucene.search.Similarity;
+import org.apache.lucene.util.LuceneTestCase;
+
+public class TestShortFieldSimilarity extends LuceneTestCase {
+  /** test that we get unique length norm bytes */
+  public void test() throws Exception {
+    Similarity similarity = new ShortFieldSimilarity();
+    FieldInvertState state = new FieldInvertState();
+    state.setBoost(1.0f);
+    byte lastValue = 0;
+    for (int i = 1; i < 10; i++) {
+      state.setLength(i);
+      byte value = similarity.encodeNormValue(similarity.computeNorm("field", state));
+      assertTrue(value != lastValue);
+      lastValue = value;
+    }
+  }
+}

Property changes on: lucene\contrib\misc\src\test\org\apache\lucene\misc\TestShortFieldSimilarity.java
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Added: svn:eol-style
   + native

Index: lucene/contrib/misc/src/java/org/apache/lucene/misc/ShortFieldSimilarity.java
===================================================================
--- lucene/contrib/misc/src/java/org/apache/lucene/misc/ShortFieldSimilarity.java	(revision 0)
+++ lucene/contrib/misc/src/java/org/apache/lucene/misc/ShortFieldSimilarity.java	(revision 0)
@@ -0,0 +1,50 @@
+package org.apache.lucene.misc;
+
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import org.apache.lucene.search.DefaultSimilarity;
+import org.apache.lucene.util.SmallFloat;
+
+/**
+ * Similarity with more precise length normalization for shorter fields
+ * such as metadata.
+ * @see SmallFloat#floatToByte52(float)
+ * @see SmallFloat#byte52ToFloat(byte)
+ * 
+ * @lucene.experimental
+ */
+public class ShortFieldSimilarity extends DefaultSimilarity {
+
+  /** Cache of decoded bytes. */
+  private static final float[] NORM_TABLE = new float[256];
+  
+  static {
+    for (int i = 0; i < 256; i++)
+      NORM_TABLE[i] = SmallFloat.byte52ToFloat((byte)i);
+  }
+
+  @Override
+  public float decodeNormValue(byte b) {
+    return NORM_TABLE[b & 0xFF];  // & 0xFF maps negative bytes to positive above 127
+  }
+
+  @Override
+  public byte encodeNormValue(float f) {
+    return SmallFloat.floatToByte52(f);
+  }
+}

Property changes on: lucene\contrib\misc\src\java\org\apache\lucene\misc\ShortFieldSimilarity.java
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Added: svn:eol-style
   + native