internal static extern bool CreateProcess(string applicationPath,
string commandLineArgs,
ref SecurityAttributes processSecurityAttributes,
ref SecurityAttributes threadSecurityAttributes,
bool inheritHandle,
ProcessCreationFlags creationFlags,
IntPtr environment,
string currentDirectory,
ref StartupInfo startupInfo,
out ProcessInformation processInformation);
internal static extern bool CreateProcess(string applicationPath, string commandLineArgs, ref SecurityAttributes processSecurityAttributes, ref SecurityAttributes threadSecurityAttributes, bool inheritHandle, ProcessCreationFlags creationFlags, IntPtr environment, string currentDirectory, ref StartupInfo startupInfo, out ProcessInformation processInformation);
void PatchClient(ProcessInformation process, ClientVersion version, out ClientLoadResult result)
{
var patchMultipleInstances = UserSettingsManager.Instance.Settings.AllowMultipleInstances;
var patchIntroVideo = UserSettingsManager.Instance.Settings.SkipIntroVideo;
var patchNoWalls = UserSettingsManager.Instance.Settings.NoWalls;
// Patch Process
ProcessMemoryAccessor accessor = null;
Stream patchStream = null;
BinaryReader reader = null;
BinaryWriter writer = null;
try
{
accessor = new ProcessMemoryAccessor(process.ProcessId, ProcessAccess.ReadWrite);
patchStream = accessor.GetStream();
reader = new BinaryReader(patchStream);
writer = new BinaryWriter(patchStream);
if (patchMultipleInstances && version.MultipleInstanceAddress > 0)
{
patchStream.Position = version.MultipleInstanceAddress;
writer.Write((byte)0x31); // XOR
writer.Write((byte)0xC0); // EAX, EAX
writer.Write((byte)0x90); // NOP
writer.Write((byte)0x90); // NOP
writer.Write((byte)0x90); // NOP
writer.Write((byte)0x90); // NOP
}
if (patchIntroVideo && version.IntroVideoAddress > 0)
{
patchStream.Position = version.IntroVideoAddress;
writer.Write((byte)0x83); // CMP
writer.Write((byte)0xFA); // EDX
writer.Write((byte)0x00); // 0
writer.Write((byte)0x90); // NOP
writer.Write((byte)0x90); // NOP
writer.Write((byte)0x90); // NOP
}
if (patchNoWalls && version.NoWallAddress > 0)
{
patchStream.Position = version.NoWallAddress;
writer.Write((byte)0xEB); // JMP SHORT
writer.Write((byte)0x17); // +0x17
writer.Write((byte)0x90); // NOP
}
result = ClientLoadResult.Success;
}
catch
{
result = ClientLoadResult.PatchingFailed;
}
finally
{
reader?.Dispose();
writer?.Dispose();
accessor?.Dispose();
patchStream?.Dispose();
// Resume and close handles.
NativeMethods.ResumeThread(process.ThreadHandle);
NativeMethods.CloseHandle(process.ThreadHandle);
NativeMethods.CloseHandle(process.ProcessHandle);
}
}
