72 lines
2.5 KiB
C#
72 lines
2.5 KiB
C#
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using Mesen.GUI.Config;
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using Mesen.GUI.Forms;
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using System;
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using System.Collections.Generic;
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using System.IO;
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using System.Linq;
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using System.Security.Cryptography;
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using System.Text;
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using System.Threading.Tasks;
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using System.Windows.Forms;
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namespace Mesen.GUI
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{
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public static class BiosHelper
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{
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private static string GetFileHash(string filename, out byte[] fileData)
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{
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using(SHA256 sha256Hash = SHA256.Create()) {
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// ComputeHash - returns byte array
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byte[] data = File.ReadAllBytes(filename);
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if(data[0] == 'N' && data[1] == 'E' && data[2] == 'S' && data[3] == '\x1a') {
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//Ignore iNES header if one exists at the start of the file
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byte[] dataWithoutHeader = new byte[data.Length - 16];
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Array.Copy(data, 16, dataWithoutHeader, 0, dataWithoutHeader.Length);
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data = dataWithoutHeader;
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}
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fileData = data;
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byte[] bytes = sha256Hash.ComputeHash(data);
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// Convert byte array to a string
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StringBuilder builder = new StringBuilder();
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for(int i = 0; i < bytes.Length; i++) {
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builder.Append(bytes[i].ToString("X2"));
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}
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return builder.ToString();
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}
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}
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private static List<string> GetExpectedHashes(RomFormat format)
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{
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switch(format) {
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case RomFormat.Fds: return new List<string> { "99C18490ED9002D9C6D999B9D8D15BE5C051BDFA7CC7E73318053C9A994B0178", "A0A9D57CBACE21BF9C85C2B85E86656317F0768D7772ACC90C7411AB1DBFF2BF" };
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case RomFormat.StudyBox: return new List<string> { "365F84C86F7F7C3AAA2042D78494D41448E998EC5A89AC1B5FECB452951D514C" };
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}
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throw new Exception("Unexpected format type");
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}
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public static bool RequestBiosFile(string fileName, int fileSize, RomFormat format)
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{
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if(MesenMsgBox.Show("BiosNotFound", MessageBoxButtons.OKCancel, MessageBoxIcon.Question, fileName, fileSize.ToString()) == DialogResult.OK) {
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using(OpenFileDialog ofd = new OpenFileDialog()) {
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ofd.SetFilter(ResourceHelper.GetMessage("FilterAll"));
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if(ofd.ShowDialog(Application.OpenForms[0]) == DialogResult.OK) {
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byte[] fileData;
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string hash = GetFileHash(ofd.FileName, out fileData);
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if(!GetExpectedHashes(format).Contains(hash)) {
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if(MesenMsgBox.Show("BiosMismatch", MessageBoxButtons.OKCancel, MessageBoxIcon.Warning, GetExpectedHashes(format)[0], hash) != DialogResult.OK) {
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//Files don't match and user cancelled the action
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return false;
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}
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}
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File.WriteAllBytes(Path.Combine(ConfigManager.HomeFolder, fileName), fileData);
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return true;
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}
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}
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}
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return false;
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}
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}
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}
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