using System;
using System.Collections.Generic;
using System.Collections;

namespace AmicEditor
{

	public class Magic
	{
		
		public List <byte[]> ImageSignatures=new List<byte[]>();
		public List <byte[]> ImageMaskSignatures=new List<byte[]>();
		
		public List <byte[]> AudioSignatures=new List<byte[]>();
		public List <byte[]> AudioMaskSignatures=new List<byte[]>();
		
		
		public Magic ()
		{
			
			// Llista completa a http://www.astro.keele.ac.uk/oldusers/rno/Computing/File_magic.html
			
			// Images PNG
			byte[] magicPNGBytes={137,80,78,71,13,10,26,10};
			byte[] magicPNGMask={255,255,255,255,255,255,255,255};
			ImageSignatures.Add(magicPNGBytes);
			ImageMaskSignatures.Add(magicPNGMask);

			// Images BMP
			byte[] magicBMPBytes={66,77,0,0,0,0,0,0};
			byte[] magicBMPMask={255,255,0,0,0,0,0,0};
			ImageSignatures.Add(magicBMPBytes);
			ImageMaskSignatures.Add(magicBMPMask);

			// Images GIF
			byte[] magicGIFBytes={71,73,70,56,0,0,0,0};
			byte[] magicGIFMask={255,255,255,255,0,0,0,0};
			ImageSignatures.Add(magicGIFBytes);
			ImageMaskSignatures.Add(magicGIFMask);
			
			// Images JPEG
			byte[] magicJPGBytes={255,216,255,224,0,0,0,0};
			byte[] magicJPGMask={255,255,255,255,0,0,0,0};
			ImageSignatures.Add(magicJPGBytes);
			ImageMaskSignatures.Add(magicJPGMask);
			
			// Images TIFF (Intel)
			byte[] magicTIFBytes={73,73,42,0,0,0,0,0};
			byte[] magicTIFMask={255,255,255,255,0,0,0,0};
			ImageSignatures.Add(magicTIFBytes);
			ImageMaskSignatures.Add(magicTIFMask);
		
			// Images TGA
			byte[] magicTGABytes={84,82,85,69,86,73,83,73};
			byte[] magicTGAMask={255,255,255,255,255,255,255,255};
			ImageSignatures.Add(magicTGABytes);
			ImageMaskSignatures.Add(magicTGAMask);
		
			
			
			// Arxius d'audio
			// Arxius MP3
			byte[] magicMP3Bytes={73,68,51,0,0,0,0,0};
			byte[] magicMP3Mask={255,255,255,0,0,0,0,0};
			AudioSignatures.Add(magicMP3Bytes);
			AudioMaskSignatures.Add(magicMP3Mask);
			
			byte[] magicMP3MonoBytes={255,250,144,192,1,207,0,0};
			byte[] magicMP3MonoMask={255,255,255,255,255,255,0,0};
			AudioSignatures.Add(magicMP3MonoBytes);
			AudioMaskSignatures.Add(magicMP3MonoMask);
										
			byte[] magicMP3StereoBytes={255,251,144,108,0,0,0,0};
			byte[] magicMP3StereoMask={255,255,255,255,0,0,0,0};
			AudioSignatures.Add(magicMP3StereoBytes);
			AudioMaskSignatures.Add(magicMP3StereoMask);
			
			
			
			
			// Arxius OGG
			byte[] magicOGGBytes={79,103,103,83,0,2,0,0};
			byte[] magicOGGMask={255,255,255,255,255,255,255,255};
			AudioSignatures.Add(magicOGGBytes);
			AudioMaskSignatures.Add(magicOGGMask);
			
			// Arxius WAV
			byte[] magicWAVBytes={87,65,86,69,102,109,116,32};
			byte[] magicWAVMask={255,255,255,255,255,255,255,255};
			AudioSignatures.Add(magicWAVBytes);
			AudioMaskSignatures.Add(magicWAVMask);
			
			byte[] magicWAV2Bytes={82,73,70,70,168,173,3,0};
			byte[] magicWAV2Mask={255,255,255,255,255,255,255,255};
			AudioSignatures.Add(magicWAV2Bytes);
			AudioMaskSignatures.Add(magicWAV2Mask);
						
			
		}
		
		
		public bool Contains(List <byte[]> Signatures, List <byte[]> Masks, byte[] magic){
			if (magic.Length<8) return false;
			
			//bool trobat=false;
			bool coincideix_el_byte;
			
			for(int i=0;i<Signatures.Count;i++){
				Console.WriteLine("Anem pel tipus d'arxiu: "+i);
				coincideix_el_byte=true;
				for(int j=0;j<8&&coincideix_el_byte;j++){
					Console.WriteLine("Compare "+Signatures[i][j]+" amb "+magic[j]);
					if(Masks[i][j]==255&&Signatures[i][j]!=magic[j]) {coincideix_el_byte=false;}// no coincideix, passem al següent
				}
				
				if (coincideix_el_byte) return true; // Tornem cert si han acabat coincidint tots els bytes
			}
			
			return false;
			
		}
		
		public bool isImageFile(string Filename){
			
			byte[] magic={0,0,0,0,0,0,0,0};
			if (!System.IO.File.Exists(Filename)) 
			{
				Console.WriteLine("Magic Error: File "+Filename+" does nos exists!");
				return false;
			} // Si no existeix tornem fals
		
			
			System.IO.FileStream f;
			// Capturem els 8 primers bytes
			try{
				f=System.IO.File.OpenRead(Filename);
			} catch (Exception ex){
				Console.WriteLine("Exception Reading File "+ex);
				return false;

			}
			
			int i=0;
			if(f.Length>8)
				i=f.Read(magic,0,8);
			
			
			if (i>=8)
			for(i=0;i<8;i++)
				Console.Write(magic[i]+" ");
			Console.WriteLine("");
						
			
			// I els comprovem amb les diferents signatures...
			if (Contains(ImageSignatures,ImageMaskSignatures, magic))  return true;
			else return false;
			
							
			/*Console.WriteLine("Magic: "+i);
			if (i>=8)
			for(i=0;i<8;i++)
				Console.Write(magic[i]+" ");
			Console.WriteLine("");
			
			magic=ImageSignatures[0];
			i=0;
			Console.WriteLine("MagicLIST: "+ImageSignatures);
			
			for(i=0;i<8;i++)
				Console.Write(magic[i]+" ");
			Console.WriteLine("");
			
			*/
			
			//return true;
		}
		
		
		public bool isAudioFile(string Filename){

			byte[] magic={0,0,0,0,0,0,0,0};
			if (!System.IO.File.Exists(Filename)) 
			{
				Console.WriteLine("Magic Error: File "+Filename+" does nos exists!");
				return false;
			} // Si no existeix tornem fals
		
			// Capturem els 8 primers bytes
			System.IO.FileStream f;
			try{
				f=System.IO.File.OpenRead(Filename);
			} catch (Exception ex){
				Console.WriteLine("Exception Reading File "+ex);
				return false;

			}
			
			int i=0;
			if(f.Length>8)
				i=f.Read(magic,0,8);
			
			
			if (i>=8)
			for(i=0;i<8;i++)
				Console.Write(magic[i]+" ");
			Console.WriteLine("");
			
			
			// I els comprovem amb les diferents signatures...
			if (Contains(AudioSignatures,AudioMaskSignatures, magic))  return true;
			else return false;
			
							
			/*Console.WriteLine("Magic: "+i);
			if (i>=8)
			for(i=0;i<8;i++)
				Console.Write(magic[i]+" ");
			Console.WriteLine("");
			
			magic=ImageSignatures[0];
			i=0;
			Console.WriteLine("MagicLIST: "+ImageSignatures);
			
			for(i=0;i<8;i++)
				Console.Write(magic[i]+" ");
			Console.WriteLine("");
			
			
			
			return true;*/
		}
		
		
		
		
		
	}
}