using System;

using System.IO;

using System.IO.Compression;

using System.Xml;



namespace MoreTerra.Utilities

{

	class CompressedXml

	{

		// This is only for static functions.

		private CompressedXml()

		{

		}



		public static void LoadXml(Stream inStream, out XmlDocument xmlDoc, Boolean keepOpen = false)

		{

			Int32 compressedSize, uncompressedSize;



			xmlDoc = null;



			if (inStream == null)

				return;



			if ((inStream.ReadByte() != (Int32)'M') || (inStream.ReadByte() != (Int32)'T') ||

				(inStream.ReadByte() != (Int32)'Z'))

				return;



			uncompressedSize = inStream.ReadByte();

			uncompressedSize += (inStream.ReadByte() * 0x100);

			uncompressedSize += (inStream.ReadByte() * 0x10000);

			uncompressedSize += (inStream.ReadByte() * 0x1000000);



			compressedSize = inStream.ReadByte();

			compressedSize += (inStream.ReadByte() * 0x100);

			compressedSize += (inStream.ReadByte() * 0x10000);

			compressedSize += (inStream.ReadByte() * 0x1000000);



			if (inStream.Length != (compressedSize + 11))

				return;



			DeflateStream ds = new DeflateStream(inStream, CompressionMode.Decompress, keepOpen);



			xmlDoc = new XmlDocument();

			xmlDoc.Load(ds);

		}



		public static void SaveToMTZ(String inFile, String outFile)

		{

			FileStream ifs = new FileStream(inFile, FileMode.Open, FileAccess.Read);

			FileStream ofs = new FileStream(outFile, FileMode.Create, FileAccess.Write);



			Byte[] buffer = new Byte[11];



			Int64 uncompressedSize = ifs.Length;



			buffer[0] = (Byte)'M';

			buffer[1] = (Byte)'T';

			buffer[2] = (Byte)'Z';



			buffer[3] = (Byte)(uncompressedSize & 0xFF);

			buffer[4] = (Byte)((uncompressedSize & 0xFF00) >> 8);

			buffer[5] = (Byte)((uncompressedSize & 0xFF0000) >> 16);

			buffer[6] = (Byte)((uncompressedSize & 0xFF000000) >> 24);



			buffer[7] = 0;

			buffer[8] = 0;

			buffer[9] = 0;

			buffer[10] = 0;



			ofs.Write(buffer, 0, 11);



			DeflateStream ds = new DeflateStream(ofs, CompressionMode.Compress, true);

			ifs.CopyTo(ds);

			ds.Flush();

			ds.Close();

			ifs.Close();



			ofs.Seek(7, SeekOrigin.Begin);



			Int64 compressedSize = (ofs.Length - 11);

			buffer[3] = (Byte)(compressedSize & 0xFF);

			buffer[4] = (Byte)((compressedSize & 0xFF00) >> 8);

			buffer[5] = (Byte)((compressedSize & 0xFF0000) >> 16);

			buffer[6] = (Byte)((compressedSize & 0xFF000000) >> 24);



			ofs.Write(buffer, 3, 4);

			ofs.Close();

		}

	}

}