[压缩]C#下使用SevenZipSharp压缩解压文本

using SevenZip;
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace SLibrary
{
public  class SevenZipUtil
{
/// <summary>
/// 压缩字符串
/// </summary>
/// <param name="input">源字符串</param>
/// <returns>压缩后字节数组</returns>
public static byte[] Compress(string input)
{
byte[] compressed = null;
SevenZipCompressor compressor = new SevenZipCompressor();
compressor.CompressionMethod = CompressionMethod.Ppmd;
compressor.CompressionLevel = CompressionLevel.High;
using (MemoryStream msin = GetUTF8MemorySteam(input))
{
using (MemoryStream msout = new MemoryStream())
{
compressor.CompressStream(msin, msout);

msout.Position = 0;
compressed = new byte[msout.Length];
msout.Read(compressed, 0, compressed.Length);
/*
Console.WriteLine("compressed: ");
foreach (byte b in compressed)
{
Console.Write(b);
Console.Write(" ");
}
Console.WriteLine();
*/
}
}
return compressed;
}

/// <summary>
/// 获取输入字符串的UTF8编码
/// </summary>
/// <param name="input">源字符串</param>
/// <returns>内存数据流</returns>
private static MemoryStream GetUTF8MemorySteam(string input)
{
MemoryStream ms = new MemoryStream();
byte[] bytes = Encoding.UTF8.GetBytes(input);
ms.Write(bytes, 0, bytes.Length);
return ms;
}

/// <summary>
/// 解压字节数组
/// </summary>
/// <param name="input">源字节数组</param>
/// <returns>解压后字符串</returns>
public static string Decompress(byte[] input)
{
/*
Console.WriteLine("input:");
foreach (byte b in input)
{
Console.Write(b);
Console.Write(" ");
}
Console.WriteLine();
*/
byte[] uncompressedbuffer = null;
using (MemoryStream msin = new MemoryStream())
{
msin.Write(input, 0, input.Length);
uncompressedbuffer = new byte[input.Length];
msin.Position = 0;
using (SevenZipExtractor extractor = new SevenZipExtractor(msin))
{
using (MemoryStream msout = new MemoryStream())
{
extractor.ExtractFile(0, msout);
msout.Position = 0;
uncompressedbuffer = new byte[msout.Length];
msout.Read(uncompressedbuffer, 0, uncompressedbuffer.Length);
}
}
}
return Encoding.UTF8.GetString(uncompressedbuffer);
}

}
}