/**
 * Copyright 2016 Yahoo Inc.
 *
 * 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.
 */

#include "CompressionCodecLZ4.h"

#include "lz4/lz4.h"
#include <cassert>

namespace pulsar {

SharedBuffer CompressionCodecLZ4::encode(const SharedBuffer& raw) {
    // Get the max size of the compressed data and allocate a buffer to hold it
    int maxCompressedSize = LZ4_compressBound(raw.readableBytes());
    SharedBuffer compressed = SharedBuffer::allocate(maxCompressedSize);

    int compressedSize = LZ4_compress_default(raw.data(), compressed.mutableData(),
                                              raw.readableBytes(), maxCompressedSize);
    assert(compressedSize > 0);
    compressed.bytesWritten(compressedSize);

    return compressed;
}

bool CompressionCodecLZ4::decode(const SharedBuffer& encoded, uint32_t uncompressedSize,
                                 SharedBuffer& decoded) {
    SharedBuffer decompressed = SharedBuffer::allocate(uncompressedSize);

    int result = LZ4_decompress_fast(encoded.data(), decompressed.mutableData(), uncompressedSize);
    if (result > 0) {
        decompressed.bytesWritten(uncompressedSize);
        decoded = decompressed;
        return true;
    } else {
        // Decompression failed
        return false;
    }
}

}