content: /*
   * 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.
   */
  package io.airlift.compress.v3.zstd;
  
  import io.airlift.compress.v3.MalformedInputException;
  
  import java.lang.foreign.MemorySegment;
  
  import static io.airlift.compress.v3.zstd.UnsafeUtil.getAddress;
  import static io.airlift.compress.v3.zstd.UnsafeUtil.getBase;
  import static java.lang.Math.addExact;
  import static java.lang.String.format;
  import static java.lang.ref.Reference.reachabilityFence;
  import static java.util.Objects.requireNonNull;
  import static sun.misc.Unsafe.ARRAY_BYTE_BASE_OFFSET;
  
  public class ZstdJavaDecompressor
          implements ZstdDecompressor
  {
      private final ZstdFrameDecompressor decompressor = new ZstdFrameDecompressor();
  
      @Override
      public int decompress(byte[] input, int inputOffset, int inputLength, byte[] output, int outputOffset, int maxOutputLength)
              throws MalformedInputException
      {
          verifyRange(input, inputOffset, inputLength);
          verifyRange(output, outputOffset, maxOutputLength);
  
          long inputAddress = ARRAY_BYTE_BASE_OFFSET + inputOffset;
          long inputLimit = inputAddress + inputLength;
          long outputAddress = ARRAY_BYTE_BASE_OFFSET + outputOffset;
          long outputLimit = outputAddress + maxOutputLength;
  
          return decompressor.decompress(input, inputAddress, inputLimit, output, outputAddress, outputLimit);
      }
  
      @Override
      public int decompress(MemorySegment input, MemorySegment output)
              throws MalformedInputException
      {
          try {
              byte[] inputBase = getBase(input);
              long inputAddress = getAddress(input);
              long inputLimit = addExact(inputAddress, input.byteSize());
  
              byte[] outputBase = getBase(output);
              long outputAddress = getAddress(output);
              long outputLimit = addExact(outputAddress, output.byteSize());
  
              return decompressor.decompress(
                      inputBase,
                      inputAddress,
                      inputLimit,
                      outputBase,
                      outputAddress,
                      outputLimit);
          }
          finally {
              reachabilityFence(input);
              reachabilityFence(output);
          }
      }
  
      @Override
      public long getDecompressedSize(byte[] input, int offset, int length)
      {
          int baseAddress = ARRAY_BYTE_BASE_OFFSET + offset;
          return ZstdFrameDecompressor.getDecompressedSize(input, baseAddress, baseAddress + length);
      }
  
      private static void verifyRange(byte[] data, int offset, int length)
      {
          requireNonNull(data, "data is null");
          if (offset < 0 || length < 0 || offset + length > data.length) {
              throw new IllegalArgumentException(format("Invalid offset or length (%s, %s) in array of length %s", offset, length, data.length));
          }
      }
  }
  