using System;
using System.Text;
using System.Runtime.InteropServices;

namespace MyClasses
{

	public class HexEdit
	{

		public const int ANSI_CHARSET = 0;
		public const int ANSI_FIXED_FONT = 11;
		public const int OEM_CHARSET = 255;
		public const int OEM_FIXED_FONT = 10;
		public const int OUT_CHARACTER_PRECIS = 2;
		public const int OUT_DEFAULT_PRECIS = 0;
		public const int OUT_DEVICE_PRECIS = 5;
		//public const int OUT_OF_DISK = UINT(-20);
		//public const int OUT_OF_MEMORY = UINT(-6);
		public const int OUT_OUTLINE_PRECIS = 8;
		public const int OUT_PS_ONLY_PRECIS = 10;
		public const int OUT_RASTER_PRECIS = 6;
		public const int OUT_SCREEN_OUTLINE_PRECIS = 9;
		public const int OUT_STRING_PRECIS = 1;
		public const int OUT_STROKE_PRECIS = 3;
		public const int OUT_TT_ONLY_PRECIS = 7;
		public const int OUT_TT_PRECIS = 4;
		public const int CLIP_CHARACTER_PRECIS = 1;
		public const int CLIP_DEFAULT_PRECIS = 0;
		public const int CLIP_EMBEDDED = 128;
		public const int CLIP_LH_ANGLES = 16;
		public const int CLIP_MASK = 0xF;
		public const int CLIP_NOT = 0x0;
		public const int CLIP_STROKE_PRECIS = 2;
		public const int CLIP_SUS = 0x20;
		public const int CLIP_TO_PATH = 4097;
		public const int CLIP_TT_ALWAYS = 32;
		public const int DEFAULT_PRECIS = 0;
		public const int DEFAULT_QUALITY = 0;
		public const int FIXED_PITCH = 1;
		public const int FF_DECORATIVE = 80;
		public const int FF_DONTCARE = 0;
		public const int FF_MODERN = 48;
		public const int FF_ROMAN = 16;
		public const int FF_SCRIPT = 64;
		public const int FF_SWISS = 32;
		public const int LOGPIXELSX = 88;
		public const int LOGPIXELSY = 90;
		public const int WM_SETFONT = 0x30;
		public const int WM_GETFONT = 0x31;



		[DllImport("user32.dll")] public static extern int
			ReleaseDC(
				int hWnd,	// handle of window 
				int hDC 	// handle of device context  
					 );

		[DllImport("gdi32.dll")] public static extern int
			DeleteObject(
				int hObject 	// handle to graphic object  
						);

		[DllImport("user32.dll")] public static extern int
			GetDC(
				int hWnd 	// handle of window  
				);

		[DllImport("gdi32.dll")] public static extern int
			GetDeviceCaps(
				int hdc,	// device-context handle 
				int nIndex 	// index of capability to query  
						);	
 

		[DllImport("gdi32.dll")] public static extern int
			CreateFont(
				int nHeight,	// logical height of font 
				int nWidth,	// logical average character width 
				int nEscapement,	// angle of escapement 
				int nOrientation,	// base-line orientation angle 
				int fnWeight,	// font weight 
				uint fdwItalic,	// italic attribute flag 
				uint fdwUnderline,	// underline attribute flag 
				uint fdwStrikeOut,	// strikeout attribute flag 
				uint fdwCharSet,	// character set identifier 
				uint fdwOutputPrecision,	// output precision 
				uint fdwClipPrecision,	// clipping precision 
				uint fdwQuality,	// output quality 
				uint fdwPitchAndFamily,	// pitch and family 
				int lpszFace 	// pointer to typeface name string 
			);

		[DllImport("kernel32.dll")] public static extern int
			MulDiv(
				int nNumber,	// 32-bit signed multiplicand  
				int nNumerator,	// 32-bit signed multiplier 
				int nDenominator 	// 32-bit signed divisor 
					);

		[DllImport("user32.dll")] public static extern int
			SendMessage(
				int hWnd,	// handle of destination window
				uint Msg,	// message to send
				int wParam,	// first message parameter
				int lParam 	// second message parameter
						);


		public HexEdit()
		{

		}



		private int MakeFont( int PacketDataHandle )		{
			int iFontSize = 10;
			int hFont = 0;
			int CurrentFont = 0;
			int hdc = GetDC( PacketDataHandle );

			int nHeight = -MulDiv( iFontSize, GetDeviceCaps(hdc, LOGPIXELSY), 72);
			ReleaseDC( PacketDataHandle , hdc );
			int cset;
			cset = ANSI_CHARSET;
			CurrentFont = SendMessage( PacketDataHandle , WM_GETFONT , 0 , 0 );
			hFont = CreateFont( nHeight,0,0,0,0,0,0,0,(uint)cset,OUT_DEFAULT_PRECIS,
				CLIP_DEFAULT_PRECIS,DEFAULT_QUALITY,FIXED_PITCH | FF_DONTCARE,0);

			SendMessage( PacketDataHandle , WM_SETFONT , hFont , 0x00010000 );
			if( CurrentFont > 0 )
				DeleteObject( CurrentFont );

			return 1;
		}
		private string PadZeros( int inInt )
		{
			StringBuilder TextField = new StringBuilder();

			string hex = Convert.ToString( inInt , 16 );

			if( hex.Length < 8 )
			{
				int ix = 8-hex.Length;
				for( int i = 0; i < ix; ++i )
				{
					TextField.Append( "0" );
				}
			}
			TextField.Append( hex );
			return TextField.ToString().ToUpper();
		}


		private string ConvertByteToHexString( byte inByte )
		{
			StringBuilder TextField = new StringBuilder();

			string hex = Convert.ToString( inByte , 16 );

			if( hex.Length == 1 )
				TextField.Append( "0" );

			TextField.Append( hex );

			return TextField.ToString().ToLower();
		}

		public string GetHexString( byte [] Data, int PacketDataHandle )
		{
			StringBuilder HexField = new StringBuilder();
			StringBuilder TextField = new StringBuilder();

			int newrow = 0;
			int global = 0;
			string hex = " ";
			string numb = " ";
			string Tmp = "";

			MakeFont( PacketDataHandle );

			for (int i = 0; i < Data.Length; ++i )
			{
				if( newrow == 0 )
				{
					numb = PadZeros( global );
					HexField.Append( " " + numb + " " );
					global += 16;
				}

				hex = ConvertByteToHexString( Data[i] );
				HexField.Append( " " + hex );	// 3 characters

				int g = Data[i];
				if( g > 31 && g < 127 )
				{
					TextField.Append( (char) Data[i] );
				}
				else
				{
					TextField.Append( "." );
				}

				++newrow;

				if( newrow >= 16 )
				{
					HexField.Append( "   " + TextField.ToString() + "\n" );
					TextField = new StringBuilder();	// clear
					newrow = 0;						// reset
				}
			}

			// get last row, if any
			byte b = 0;
			string s = "";
			if( newrow > 0 && newrow < 16 )
			{
				for( int i = 0; i < ( 16 - newrow ); ++i )
				{
					s = ConvertByteToHexString( b );
					HexField.Append( " " + s );
				}
				HexField.Append( "   " + TextField );
			}
			HexField.Append( "\n\n" );
			
			Tmp = HexField.ToString();

			return Tmp;
		}

	}
}