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/*
 * Copyright (C) 2011 the original author or authors.
 * See the notice.md file distributed with this work for additional
 * information regarding copyright ownership.
 *
 * 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 org.iq80.snappy;

import java.util.Arrays;

public final class Snappy
{
    private Snappy()
    {
    }

    public static int getUncompressedLength(byte[] compressed, int compressedOffset)
            throws CorruptionException
    {
//        System.out.println("getUncompressedLength:");
        return SnappyDecompressor.getUncompressedLength(compressed, compressedOffset);
    }

    public static byte[] uncompress(byte[] compressed, int compressedOffset, int compressedSize)
            throws CorruptionException
    {
//        System.out.println("uncompress 1:");
        return SnappyDecompressor.uncompress(compressed, compressedOffset, compressedSize);
    }

    public static int uncompress(byte[] compressed, int compressedOffset, int compressedSize, byte[] uncompressed, int uncompressedOffset)
            throws CorruptionException
    {
//        System.out.println("uncompress 2:");
        return SnappyDecompressor.uncompress(compressed, compressedOffset, compressedSize, uncompressed, uncompressedOffset);
    }

    public static int maxCompressedLength(int sourceLength)
    {
//        System.out.println("maxCompressedLength:");
        return SnappyCompressor.maxCompressedLength(sourceLength);
    }

    public static int compress(
            byte[] uncompressed,
            int uncompressedOffset,
            int uncompressedLength,
            byte[] compressed,
            int compressedOffset)
    {
//        System.out.println("compress 1:");
        return SnappyCompressor.compress(uncompressed,
                uncompressedOffset,
                uncompressedLength,
                compressed,
                compressedOffset);
    }


    public static byte[] compress( byte[] data) {
//        System.out.println("compress 2:");        
        byte[] compressedOut = new byte[maxCompressedLength(data.length)];
        int compressedSize = compress(data, 0, data.length, compressedOut, 0);
        byte[] trimmedBuffer = Arrays.copyOf(compressedOut, compressedSize);
        return trimmedBuffer;
    }

    static final int LITERAL = 0;
    static final int COPY_1_BYTE_OFFSET = 1;  // 3 bit length + 3 bits of offset in opcode
    static final int COPY_2_BYTE_OFFSET = 2;
    static final int COPY_4_BYTE_OFFSET = 3;
}