SoftEtherVPN/src/BuildUtil/CoreUtil/Compress.cs

// CoreUtil


using System;
using System.Threading;
using System.Data;
using System.Data.Sql;
using System.Data.SqlClient;
using System.Data.SqlTypes;
using System.Text;
using System.Configuration;
using System.Collections;
using System.Collections.Generic;
using System.Security.Cryptography;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.IO;
using System.Drawing;
using System.Drawing.Imaging;
using System.Drawing.Drawing2D;
using System.Web.Mail;
using CoreUtil.Internal;

namespace CoreUtil
{
	public static class ZLib
	{
		public static byte[] Compress(byte[] src)
		{
			return Compress(src, zlibConst.Z_DEFAULT_COMPRESSION);
		}
		public static byte[] Compress(byte[] src, int level)
		{
			return Compress(src, level, false);
		}
		public static byte[] Compress(byte[] src, int level, bool noHeader)
		{
			int dstSize = src.Length * 2 + 100;
			byte[] dst = new byte[dstSize];

			compress2(ref dst, src, level, noHeader);

			return dst;
		}

		public static byte[] Uncompress(byte[] src, int originalSize)
		{
			byte[] dst = new byte[originalSize];

			uncompress(ref dst, src);

			return dst;
		}

		static void compress2(ref byte[] dest, byte[] src, int level, bool noHeader)
		{
			ZStream stream = new ZStream();

			stream.next_in = src;
			stream.avail_in = src.Length;

			stream.next_out = dest;
			stream.avail_out = dest.Length;

			if (noHeader == false)
			{
				stream.deflateInit(level);
			}
			else
			{
				stream.deflateInit(level, -15);
			}

			stream.deflate(zlibConst.Z_FINISH);

			Array.Resize<byte>(ref dest, (int)stream.total_out);
		}

		static void uncompress(ref byte[] dest, byte[] src)
		{
			ZStream stream = new ZStream();

			stream.next_in = src;
			stream.avail_in = src.Length;

			stream.next_out = dest;
			stream.avail_out = dest.Length;

			stream.inflateInit();

			int err = stream.inflate(zlibConst.Z_FINISH);
			if (err != zlibConst.Z_STREAM_END)
			{
				stream.inflateEnd();
				throw new ApplicationException();
			}

			Array.Resize<byte>(ref dest, (int)stream.total_out);

			err = stream.inflateEnd();
			if (err != zlibConst.Z_OK)
			{
				throw new ApplicationException();
			}
		}
	}
}