c# – GZipStream压缩问题(Lost Byte)

发布时间：2020-12-15 03:47:48 所属栏目：百科来源：网络整理

导读：我有一个奇怪的问题,GZip Serializer. 尝试用数据序列化对象. 以下代码给出结果(在调试中的POINT1)：ms.Length = 100028和uncompressedStream.Length = 100027 POINT1之后有异常“解析结束之前遇到的结束”,我觉得这是丢失字节的结果. 我正在使用.net 4.0. /

我有一个奇怪的问题,GZip Serializer.

尝试用数据序列化对象.

以下代码给出结果(在调试中的POINT1)：ms.Length = 100028和uncompressedStream.Length = 100027

POINT1之后有异常“解析结束之前遇到的结束”,我觉得这是丢失字节的结果.

我正在使用.net 4.0.

//generating data
        int length = 100000;
        byte[] data = new byte[length];
        for (int i = 0; i < length; i++)
        {
            data[i] = System.Convert.ToByte(i % 100 + i % 50);
        }


        //serialization into memory stream
        IFormatter formatter = new BinaryFormatter();
        var ms = new MemoryStream();
        formatter.Serialize(ms,data);
        ms.Seek(0,SeekOrigin.Begin);

        //GZip zip
        MemoryStream compressedStream = new MemoryStream();
        var Compress = new GZipStream(compressedStream,CompressionMode.Compress);
        ms.CopyTo(Compress);  
        compressedStream.Seek(0,SeekOrigin.Begin);

        //GZip Unzip
        MemoryStream uncompressedStream = new MemoryStream();
        var Decompress = new GZipStream(compressedStream,CompressionMode.Decompress);
        Decompress.CopyTo(uncompressedStream);
        uncompressedStream.Seek(0,SeekOrigin.Begin);

        //deserialization from memory stream
        //POINT1
        var oo = formatter.Deserialize(uncompressedStream);
        var o = (byte[])oo;

        //checking
        Assert.AreEqual(data.Length,o.Length);
        for (int i = 0; i < data.Length; i++)
            Assert.AreEqual(data[i],o[i]);

解决方法

压缩流在关闭之前不会冲洗(并且不能正常冲洗).您需要关闭GZipStream.告诉它不要关闭底层流(一个构造函数的参数)会使这更容易.

//generating data
        int length = 100000;
        byte[] data = new byte[length];
        for (int i = 0; i < length; i++)
        {
            data[i] = System.Convert.ToByte(i % 100 + i % 50);
        }

        byte[] o;
        //serialization into memory stream
        IFormatter formatter = new BinaryFormatter();
        using (var ms = new MemoryStream())
        {
            formatter.Serialize(ms,data);
            ms.Seek(0,SeekOrigin.Begin);

            //GZip zip
            using(MemoryStream compressedStream = new MemoryStream())
            {
                using (var Compress = new GZipStream(compressedStream,CompressionMode.Compress,true))
                {
                    ms.CopyTo(Compress);
                }
                compressedStream.Seek(0,SeekOrigin.Begin);
                //GZip Unzip
                using (MemoryStream uncompressedStream = new MemoryStream())
                {
                    using (var Decompress = new GZipStream(compressedStream,CompressionMode.Decompress,true))
                    {
                        Decompress.CopyTo(uncompressedStream);
                    }
                    uncompressedStream.Seek(0,SeekOrigin.Begin);
                    var oo = formatter.Deserialize(uncompressedStream);
                    o = (byte[])oo;
                }
            }
            //deserialization from memory stream
            //POINT1

        }
        //checking
        Debug.Assert(data.Length == o.Length);
        for (int i = 0; i < data.Length; i++)
            Debug.Assert(data[i] == o[i]);

（编辑：李大同）

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