using System;
using System.Collections.Generic;
using System.Text;
using System.Runtime.Serialization.Formatters.Binary;
using System.Runtime.Serialization;
using System.IO;
using System.IO.Compression;

namespace EAS.Security
{
#if SOA_NO
    static class Compressor
#else
    /// <summary>
    /// 数据压缩。
    /// </summary>
    public static class Compressor
#endif
    {
        /// <summary>
        /// 压缩数据。
        /// </summary>
        /// <param name="buffer">待压缩的数据。</param>
        /// <returns>完成压缩的数据。</returns>
        public static byte[] Compress(byte[] buffer)
        {
            MemoryStream ms = new MemoryStream();
            using (DeflateStream zipStream = new DeflateStream(ms, CompressionMode.Compress, true))
            {
                zipStream.Write(buffer, 0, buffer.Length);
                zipStream.Flush();
            }
            //zipStream.Close();
            return ms.ToArray();
        }

        /// <summary>
        /// 压缩数据。
        /// </summary>
        /// <param name="buffer">待压缩的数据。</param>
        /// <returns>完成压缩的数据。</returns>
        public static byte[] Decompress(byte[] buffer)
        {
            using (MemoryStream input = new MemoryStream())
            {
                input.Write(buffer, 0, buffer.Length);
                input.Position = 0;
                using (DeflateStream def = new DeflateStream(input, CompressionMode.Decompress))
                {
                    using (MemoryStream output = new MemoryStream())
                    {
                        byte[] buff = new byte[64];
                        int read = -1;
                        read = def.Read(buff, 0, buff.Length);
                        while (read > 0)
                        {
                            output.Write(buff, 0, read);
                            read = def.Read(buff, 0, buff.Length);
                        }
                        return output.ToArray();
                    }
                }
            }
        }
    }
}