如何在java中用zstd算法压缩和解压字节数组

Question

我正在尝试使用 ZSTD 算法来压缩和解压缩字节数组。 我阅读了 ZSTD 文档，该文档将提供有关实现的更多详细信息，但我仍然无法实现足够的方法来压缩和解压缩字节数组。 如果有人能向我解释我必须做什么，将不胜感激。

public static byte[] compressZstd(byte[] input) throws IOException {
        var compressor = new ZstdCompressor();
        byte[] compressedBuffer = new byte[1024];
        compressor.compress(input, 0, input.length, compressedBuffer, 0, 1024);
        return compressedBuffer;
    }

public static byte[] decompressZstd(byte[] input) throws IOException {
        var decompressor = new ZstdDecompressor();
        byte[] decompressedBuffer = new byte[1024];
        decompressor.decompress(input, 0, input.length, decompressedBuffer, 0, 1024);
        return decompressedBuffer;

    }

Answer 1

你应该确定缓冲区的大小，还要确定缓冲区的索引值。

public static byte[] compressZstd(byte[] input) throws IOException {
        var compressor = new ZstdCompressor();
        int maxCompressLength = compressor.maxCompressedLength(input.length);
        byte[] compressedBuffer = new byte[maxCompressLength];
        int compressedSize = compressor.compress(input, 0, input.length, compressedBuffer, 0, compressedBuffer.length);
        return Arrays.copyOfRange(compressedBuffer, 0, compressedSize);
    }

    public static byte[] decompressZstd(byte[] compressed) throws IOException {
        var decompressor = new ZstdDecompressor();
        byte[] decompressedBuffer = new byte[Integer.MAX_VALUE];
        int decompressedSize = decompressor
                .decompress(compressed, 0, compressed.length, decompressedBuffer, 0, decompressedBuffer.length);
        return Arrays.copyOfRange(decompressedBuffer, 0, decompressedSize);

    }