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Do encrypted DS rom detection better

This commit is contained in:
CasualPokePlayer 2024-10-18 20:41:13 -07:00
parent 2ddfc5f172
commit c954e8c189
1 changed files with 7 additions and 5 deletions
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12
src/BizHawk.Emulation.Cores/Consoles/Nintendo/NDS/MelonDS.cs
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@ -1,3 +1,4 @@
using System.Buffers.Binary;
using System.Collections.Generic;
using System.IO;
using System.IO.Compression;
@ -192,12 +193,13 @@ namespace BizHawk.Emulation.Cores.Consoles.Nintendo.NDS
if (!_activeSyncSettings.UseRealBIOS)
{
// check if the user is using an encrypted rom
// if they are, they need to be using real bios files
Span<byte> decryptedBytePattern = stackalloc byte[] { 0xFF, 0xDE, 0xFF, 0xE7, 0xFF, 0xDE, 0xFF, 0xE7 };
if (!roms[0].AsSpan(0x4000, 8).SequenceEqual(decryptedBytePattern))
var arm9RomOffset = BinaryPrimitives.ReadInt32LittleEndian(roms[0].AsSpan(0x20, 4));
if (arm9RomOffset is >= 0x4000 and < 0x8000)
{
_activeSyncSettings.UseRealBIOS = true;
// check if the user is using an encrypted rom
// if they are, they need to be using real bios files
var secureAreaId = BinaryPrimitives.ReadUInt64LittleEndian(roms[0].AsSpan(arm9RomOffset, 8));
_activeSyncSettings.UseRealBIOS = secureAreaId != 0xE7FFDEFF_E7FFDEFF;
}
}