--- /dev/null
+package net.jpountz.lz4;
+
+/*
+ * 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.checkNotReadOnly;
+import static net.jpountz.util.ByteBufferUtils.checkRange;
+import static net.jpountz.util.SafeUtils.checkRange;
+
+import java.nio.ByteBuffer;
+
+/**
+ * Fast {@link LZ4FastCompressor}s implemented with JNI bindings to the original C
+ * implementation of LZ4.
+ */
+final class LZ4JNICompressor extends LZ4Compressor {
+
+ public static final LZ4Compressor INSTANCE = new LZ4JNICompressor();
+ private static LZ4Compressor SAFE_INSTANCE;
+
+ @Override
+ public int compress(byte[] src, int srcOff, int srcLen, byte[] dest, int destOff, int maxDestLen) {
+ checkRange(src, srcOff, srcLen);
+ checkRange(dest, destOff, maxDestLen);
+ final int result = LZ4JNI.LZ4_compress_limitedOutput(src, null, srcOff, srcLen, dest, null, destOff, maxDestLen);
+ if (result <= 0) {
+ throw new LZ4Exception("maxDestLen is too small");
+ }
+ return result;
+ }
+
+ @Override
+ public int compress(ByteBuffer src, int srcOff, int srcLen, ByteBuffer dest, int destOff, int maxDestLen) {
+ checkNotReadOnly(dest);
+ checkRange(src, srcOff, srcLen);
+ checkRange(dest, destOff, maxDestLen);
+
+ if ((src.hasArray() || src.isDirect()) && (dest.hasArray() || dest.isDirect())) {
+ byte[] srcArr = null, destArr = null;
+ ByteBuffer srcBuf = null, destBuf = null;
+ if (src.hasArray()) {
+ srcArr = src.array();
+ srcOff += src.arrayOffset();
+ } else {
+ assert src.isDirect();
+ srcBuf = src;
+ }
+ if (dest.hasArray()) {
+ destArr = dest.array();
+ destOff += dest.arrayOffset();
+ } else {
+ assert dest.isDirect();
+ destBuf = dest;
+ }
+
+ final int result = LZ4JNI.LZ4_compress_limitedOutput(srcArr, srcBuf, srcOff, srcLen, destArr, destBuf, destOff, maxDestLen);
+ if (result <= 0) {
+ throw new LZ4Exception("maxDestLen is too small");
+ }
+ return result;
+ } else {
+ LZ4Compressor safeInstance = SAFE_INSTANCE;
+ if (safeInstance == null) {
+ safeInstance = SAFE_INSTANCE = LZ4Factory.safeInstance().fastCompressor();
+ }
+ return safeInstance.compress(src, srcOff, srcLen, dest, destOff, maxDestLen);
+ }
+ }
+}