make discs disposable and polish up discohawk extractor

BizHawk.Emulation/DiscSystem/Disc.cs

@@ -67,7 +67,7 @@ using System.Collections.Generic;
 
 namespace BizHawk.DiscSystem
 {
-	public partial class Disc
+	public partial class Disc : IDisposable
 	{
 		//TODO - separate these into Read_2352 and Read_2048 (optimizations can be made by ISector implementors depending on what is requested)
 		//(for example, avoiding the 2048 byte sector creating the ECC data and then immediately discarding it)
@@ -76,7 +76,7 @@ namespace BizHawk.DiscSystem
 			int Read(byte[] buffer, int offset);
 		}
 
-		public interface IBlob
+		public interface IBlob : IDisposable
 		{
 			int Read(long byte_pos, byte[] buffer, int offset, int count);
 			void Dispose();
@@ -311,6 +311,14 @@ namespace BizHawk.DiscSystem
 		public List<SectorEntry> Sectors = new List<SectorEntry>();
 		public DiscTOC TOC = new DiscTOC();
 
+		public void Dispose()
+		{
+			foreach (var blob in Blobs)
+			{
+				blob.Dispose();
+			}
+		}
+
 		void FromIsoPathInternal(string isoPath)
 		{
 			var session = new DiscTOC.Session();
@@ -453,6 +461,9 @@ namespace BizHawk.DiscSystem
 			return ret;
 		}
 
+		/// <summary>
+		/// THIS HASNT BEEN TESTED IN A LONG TIME. DOES IT WORK?
+		/// </summary>
 		public static Disc FromIsoPath(string isoPath)
 		{
 			var ret = new Disc();

DiscoHawk/AudioExtractor.cs

@@ -1,4 +1,5 @@
 using System;
+using System.Windows.Forms;
 using System.Collections.Generic;
 using System.Linq;
 using System.Text;
@@ -14,6 +15,7 @@ namespace BizHawk
 
         public static void Extract(Disc disc, string path, string filebase)
         {
+			bool confirmed = false;
             var tracks = disc.TOC.Sessions[0].Tracks;
             foreach (var track in tracks)
             {
@@ -25,12 +27,23 @@ namespace BizHawk
                 for (int sector = 0; sector < track.length_aba; sector++)
                     disc.ReadLBA_2352(startLba + sector, waveData, sector * 2352);
 
+				string mp3Path = string.Format("{0} - Track {1:D2}.mp3", Path.Combine(path, filebase), track.num);
+				if(File.Exists(mp3Path))
+				{
+					if (!confirmed)
+					{
+						var dr = MessageBox.Show("This file already exists. Do you want extraction to proceed overwriting files, or cancel the entire operation immediately?", "File already exists", MessageBoxButtons.OKCancel);
+						if (dr == DialogResult.Cancel) return;
+						confirmed = true;
+					}
+					File.Delete(mp3Path);
+				}
+
 				string tempfile = Path.GetTempFileName();
 
 				try
 				{
 					File.WriteAllBytes(tempfile, waveData);
-					string mp3Path = string.Format("{0} - Track {1:D2}.mp3", Path.Combine(path, filebase), track.num);
 					var ffmpeg = new FFMpeg();
 					ffmpeg.Run("-f", "s16le", "-ar", "44100", "-ac", "2", "-i", tempfile, "-f", "mp3", "-ab", "192k", mp3Path);
 				}

DiscoHawk/MainDiscoForm.cs

@@ -131,10 +131,12 @@ namespace BizHawk
 			if (files.Count == 0) return;
             foreach (var file in files)
             {
-                var disc = Disc.FromCuePath(file);
-                var path = Path.GetDirectoryName(file);
-                var filename = Path.GetFileNameWithoutExtension(file);
-                AudioExtractor.Extract(disc, path, filename);
+				using (var disc = Disc.FromCuePath(file))
+				{
+					var path = Path.GetDirectoryName(file);
+					var filename = Path.GetFileNameWithoutExtension(file);
+					AudioExtractor.Extract(disc, path, filename);
+				}
             }
         }
 	}