Migrated source code from Simantics SVN

[simantics/platform.git] / bundles / org.simantics.lz4 / src / net / jpountz / xxhash / XXHash64.java

diff --git a/bundles/org.simantics.lz4/src/net/jpountz/xxhash/XXHash64.java b/bundles/org.simantics.lz4/src/net/jpountz/xxhash/XXHash64.java
new file mode 100644 (file)
index 0000000..3ab73dd
--- /dev/null
+++ b/bundles/org.simantics.lz4/src/net/jpountz/xxhash/XXHash64.java
@@ -0,0 +1,55 @@
+package net.jpountz.xxhash;
+
+import java.nio.ByteBuffer;
+
+/*
+ * Licensed 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.
+ */
+
+/**
+ * A 64-bits hash.
+ * <p>
+ * Instances of this class are thread-safe.
+ */
+public abstract class XXHash64 {
+
+  /**
+   * Compute the 64-bits hash of <code>buf[off:off+len]</code> using seed
+   * <code>seed</code>.
+   */
+  public abstract long hash(byte[] buf, int off, int len, long seed);
+
+  /**
+   * Compute the hash of the given slice of the {@link ByteBuffer}.
+   * {@link ByteBuffer#position() position} and {@link ByteBuffer#limit() limit}
+   * are not modified. 
+   */
+  public abstract long hash(ByteBuffer buf, int off, int len, long seed);
+
+  /**
+   * Compute the hash of the given {@link ByteBuffer}. The
+   * {@link ByteBuffer#position() position} is moved in order to reflect bytes
+   * which have been read.
+   */
+  public final long hash(ByteBuffer buf, long seed) {
+    final long hash = hash(buf, buf.position(), buf.remaining(), seed);
+    buf.position(buf.limit());
+    return hash;
+  }
+
+  @Override
+  public String toString() {
+    return getClass().getSimpleName();
+  }
+
+}