Add deheader to git

This code is based on the deheader experimental code in the web version. It is very rough but it works for now.
2025-12-16 19:14:27 +00:00 · 2016-03-28 01:01:56 -07:00
parent 35d892017c
commit d730b58dd6
5 changed files with 221 additions and 0 deletions
--- a/Deheader/Program.cs
+++ b/Deheader/Program.cs
@@ -0,0 +1,113 @@
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Text.RegularExpressions;
+
+namespace Deheader
+{
+	class Program
+	{
+		private static string help = @"Deheader.exe type filename|dirname
+
+Type can be one of the following:
+	a7800, fds, lynx, nes, snes";
+
+		static void Main(string[] args)
+		{
+			// Type mapped to header size (in decimal bytes)
+			Dictionary<string, int> types = new Dictionary<string, int>();
+			types.Add("a7800", 128);
+			types.Add("fds", 16);
+			types.Add("lynx", 64);
+			types.Add("nes", 16);
+			types.Add("snes", 512);
+
+			if (args.Length != 2 || !types.ContainsKey(args[0]))
+			{
+				Console.WriteLine(help);
+				return;
+			}
+
+			// Get type of file and the filename (or foldername) itself
+			string type = args[0];
+			string file = args[1];
+			int hs = types[type];
+
+			// If it's a single file, just check it
+			if (File.Exists(file))
+			{
+				DetectRemoveHeader(type, file, hs);
+			}
+			// If it's a directory, recursively check all
+			else if (Directory.Exists(file))
+			{
+				foreach (string sub in Directory.GetFiles(file))
+				{
+					if (sub != ".." && sub != ".")
+					{
+						DetectRemoveHeader(type, sub, hs);
+					}
+				}
+			}
+			// Else, show that help text
+			else
+			{
+				Console.WriteLine(help);
+			}
+		}
+
+		private static void DetectRemoveHeader(string type, string file, int hs)
+		{
+			// Open the file in read mode
+			BinaryReader br = new BinaryReader(File.OpenRead(file));
+
+			// Extract the header from the file
+			byte[] hbin = br.ReadBytes(hs);
+			string header = BitConverter.ToString(hbin).Replace("-", string.Empty);
+
+			Console.WriteLine("Possible header: " + header);
+
+			// Deal with each possible type
+			bool hasHeader = false;
+			switch (type)
+			{
+				case "a7800":
+					bool a7800a = Regex.IsMatch(header, "^.415441524937383030");
+					bool a7800b = Regex.IsMatch(header, "^.{64}41435455414C20434152542044415441205354415254532048455245");
+					hasHeader = a7800a || a7800b;
+					break;
+				case "fds":
+					hasHeader = Regex.IsMatch(header, "^4644531A0[1-4]0000000000000000000000");
+					break;
+				case "lynx":
+					bool lynxa = Regex.IsMatch(header, "^4C594E58");
+					bool lynxb = Regex.IsMatch(header, "^425339");
+					hasHeader = lynxa || lynxb;
+					break;
+				case "nes":
+					hasHeader = Regex.IsMatch(header, "^4E45531A");
+					break;
+				case "snes":
+					bool fig = Regex.IsMatch(header, "^.{16}0000000000000000");
+					bool smc = Regex.IsMatch(header, "^.{16}AABB040000000000");
+					bool ufo = Regex.IsMatch(header, "^.{16}535550455255464F");
+					hasHeader = fig || smc || ufo;
+					break;
+			}
+
+			Console.WriteLine("File has header: " + hasHeader);
+
+			if (hasHeader)
+			{
+				Console.WriteLine("Creating unheadered file: " + file + ".new");
+				BinaryWriter bw = new BinaryWriter(File.OpenWrite(file + ".new"));
+				FileInfo fi = new FileInfo(file);
+				bw.Write(br.ReadBytes((int)fi.Length - hs));
+				bw.Close();
+				Console.WriteLine("Unheadered file created!");
+			}
+
+			br.Close();
+		}
+	}
+}