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  • 压缩和解压方法

     public static class SlGZip
        {
            /// <summary>
            /// 压缩
            /// </summary>
            /// <param name="input">输入</param>
            /// <returns>结果</returns>
            public static string Compress(string input)
            {
                string result = string.Empty;
                if (!string.IsNullOrEmpty(input))
                {
                    byte[] source = Encoding.UTF8.GetBytes(input);
                    using (MemoryStream memoryStream = new MemoryStream())
                    {
                        using (GZipStream gzs = new GZipStream(memoryStream, CompressionMode.Compress, true))
                        {
                            gzs.Write(source, 0, source.Length);
                        }

                        memoryStream.Position = 0;

                        byte[] target = new byte[memoryStream.Length];
                        memoryStream.Read(target, 0, target.Length);

                        byte[] finalBuffer = new byte[target.Length + 4];
                        Buffer.BlockCopy(target, 0, finalBuffer, 4, target.Length);
                        Buffer.BlockCopy(BitConverter.GetBytes(source.Length), 0, finalBuffer, 0, 4);

                        result = System.Convert.ToBase64String(finalBuffer);
                    }
                }

                return result;
            }

            /// <summary>
            /// 解压
            /// </summary>
            /// <param name="input">输入</param>
            /// <returns>结果</returns>
            public static string Decompress(string input)
            {
                string result = string.Empty;
                if (!string.IsNullOrEmpty(input))
                {
                    byte[] source = System.Convert.FromBase64String(input);
                    using (MemoryStream memoryStream = new MemoryStream())
                    {
                        int length = BitConverter.ToInt32(source, 0);
                        memoryStream.Write(source, 4, source.Length - 4);
                        memoryStream.Position = 0;
                        byte[] decmpBytes = new byte[length];
                        using (GZipStream gzs = new GZipStream(memoryStream, CompressionMode.Decompress))
                        {
                            gzs.Read(decmpBytes, 0, length);
                        }

                        result = Encoding.UTF8.GetString(decmpBytes);
                    }
                }

                return result;
            }

            /// <summary>
            /// byte数组GZip压缩
            /// </summary>
            /// <param name="bytes"></param>
            /// <returns></returns>
            public static byte[] Compress(byte[] bytes)
            {
                using (MemoryStream ms = new MemoryStream())
                {
                    GZipStream Compress = new GZipStream(ms, CompressionMode.Compress);
                    Compress.Write(bytes, 0, bytes.Length);
                    Compress.Close();
                    return ms.ToArray();

                }
            }

            /// <summary>
            /// byte数组GZip解压缩
            /// </summary>
            /// <param name="bytes"></param>
            /// <returns></returns>
            public static byte[] Decompress(Byte[] bytes)
            {
                using (MemoryStream tempMs = new MemoryStream())
                {
                    using (MemoryStream ms = new MemoryStream(bytes))
                    {
                        GZipStream Decompress = new GZipStream(ms, CompressionMode.Decompress);
                        Decompress.CopyTo(tempMs);
                        Decompress.Close();
                        return tempMs.ToArray();
                    }
                }
            }
        }

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  • 原文地址:https://www.cnblogs.com/sk2016/p/6088249.html
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