[Headerer] Modularize Headerer and port some core features to the DLL

SabreTools.Helper/Tools/RomTools.cs

@@ -3,6 +3,7 @@ using System;
 using System.Collections.Generic;
 using System.IO;
 using System.Security.Cryptography;
+using System.Text.RegularExpressions;
 
 namespace SabreTools.Helper
 {
@@ -72,6 +73,64 @@ namespace SabreTools.Helper
 			return rom;
 		}
 
+		/// <summary>
+		/// Get the header type for the input file
+		/// </summary>
+		/// <param name="input">Input file to parse for header</param>
+		/// <param name="hs">Passed back size of the header</param>
+		/// <param name="logger">Logger object for file and console output</param>
+		/// <returns>The detected HeaderType</returns>
+		public static HeaderType GetFileHeaderType(string input, out int hs, Logger logger)
+		{
+			// Open the file in read mode
+			BinaryReader br = new BinaryReader(File.OpenRead(input));
+
+			// Extract the first 1024 bytes of the file
+			byte[] hbin = br.ReadBytes(1024);
+			string header = BitConverter.ToString(hbin).Replace("-", string.Empty);
+			br.Dispose();
+
+			// Determine the type of the file from the header, if possible
+			HeaderType type = HeaderType.None;
+
+			// Loop over the header types and see if there's a match
+			hs = -1;
+			foreach (HeaderType test in Enum.GetValues(typeof(HeaderType)))
+			{
+				Dictionary<string, int> tempDict = new Dictionary<string, int>();
+
+				// Try populating the dictionary from the master list
+				try
+				{
+					tempDict = Remapping.HeaderMaps[test.ToString()];
+				}
+				catch
+				{
+					logger.Warning("The mapping for '" + test.ToString() + "' cannot be found!");
+					continue;
+				}
+
+				// Loop over the dictionary and see if there are matches
+				foreach (KeyValuePair<string, int> entry in tempDict)
+				{
+					if (Regex.IsMatch(header, entry.Key))
+					{
+						type = test;
+						hs = entry.Value;
+						break;
+					}
+				}
+
+				// If we found something, break out
+				if (type != HeaderType.None)
+				{
+					break;
+				}
+			}
+
+			return type;
+		}
+
 		/// <summary>
 		/// Merge an arbitrary set of ROMs based on the supplied information
 		/// </summary>