using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO;
using ICSharpCode.SharpZipLib;
using ICSharpCode.SharpZipLib.GZip;

/// <summary>
/// GZIP相关工具集
/// </summary>
public partial class Utils
{
    /// <summary>
    /// GZIP压缩
    /// </summary>
    /// <param name="content">压缩字符串</param>
    /// <returns>压缩后字符串</returns>
    public static string GZipEncode(string content)
    {
        return Bytes2Str(GZipEncode(Str2Bytes(content)));
    }

    /// <summary>
    /// GZIP压缩
    /// </summary>
    /// <param name="bytes">压缩字节流</param>
    /// <returns>压缩后的字节流</returns>
    public static byte[] GZipEncode(byte[] bytes)
    {
        MemoryStream ms = new MemoryStream();
        GZipOutputStream gz = new GZipOutputStream(ms);
        gz.Write(bytes, 0, bytes.Length);
        gz.Close();
        byte[] ret = ms.ToArray();
        ms.Close();
        return ret;
    }

    /// <summary>
    /// GZIP解压缩
    /// </summary>
    /// <param name="content">已压缩字符串</param>
    /// <returns>解压缩后字符串</returns>
    public static string GZipDecode(string content)
    {
        return Bytes2Str(GZipDecode(Str2Bytes(content)));
    }

    /// <summary>
    /// GZIP解压缩
    /// </summary>
    /// <param name="bytes">已压缩字节流</param>
    /// <returns>解压缩后字节流</returns>
    public static byte[] GZipDecode(byte[] bytes)
    {
        MemoryStream des = new MemoryStream();
        MemoryStream ms = new MemoryStream(bytes);
        GZipInputStream gz = new GZipInputStream(ms);
        int count = 0;
        int offset = 0;
        byte[] buf = new byte[1024 * 1024];
        do
        {
            count = gz.Read(buf, 0, buf.Length);
            des.Write(buf, 0, count);
            offset += count;
        } while (count > 0);
        gz.Close();
        byte[] ret = des.ToArray();
        ms.Close();
        return ret;
    }
}