Migrated source code from Simantics SVN

[simantics/platform.git] / bundles / org.simantics.lz4 / src / net / jpountz / xxhash / XXHash64JNI.java

diff --git a/bundles/org.simantics.lz4/src/net/jpountz/xxhash/XXHash64JNI.java b/bundles/org.simantics.lz4/src/net/jpountz/xxhash/XXHash64JNI.java
new file mode 100644 (file)
index 0000000..d952e1e
--- /dev/null
+++ b/bundles/org.simantics.lz4/src/net/jpountz/xxhash/XXHash64JNI.java
@@ -0,0 +1,49 @@
+package net.jpountz.xxhash;
+
+/*
+ * 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.
+ */
+
+import static net.jpountz.util.ByteBufferUtils.checkRange;
+import static net.jpountz.util.SafeUtils.checkRange;
+
+import java.nio.ByteBuffer;
+
+final class XXHash64JNI extends XXHash64 {
+
+  public static final XXHash64 INSTANCE = new XXHash64JNI();
+  private static XXHash64 SAFE_INSTANCE;
+
+  @Override
+  public long hash(byte[] buf, int off, int len, long seed) {
+    checkRange(buf, off, len);
+    return XXHashJNI.XXH64(buf, off, len, seed);
+  }
+
+  @Override
+  public long hash(ByteBuffer buf, int off, int len, long seed) {
+    if (buf.isDirect()) {
+      checkRange(buf, off, len);
+      return XXHashJNI.XXH64BB(buf, off, len, seed);
+    } else if (buf.hasArray()) {
+      return hash(buf.array(), off + buf.arrayOffset(), len, seed);
+    } else {
+      XXHash64 safeInstance = SAFE_INSTANCE;
+      if (safeInstance == null) {
+        safeInstance = SAFE_INSTANCE = XXHashFactory.safeInstance().hash64();
+      }
+      return safeInstance.hash(buf, off, len, seed);
+    }
+  }
+
+}