console-markdown/dllmain.cpp at master · Y-Less/console-markdown · GitHub

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#define WIN32_LEAN_AND_MEAN             // Exclude rarely-used stuff from Windows headers
// Windows Header Files
#include <windows.h>

#include "console-colour.h"
#include "subhook/subhook.h"

#define CONSOLECOLOUR_API __declspec(dllexport)

static int
	OutputC(void* data, wchar_t c, struct console_colour_stream_s* const stream)
{
	return WriteConsoleW(data, &c, 1, NULL, NULL) ? 1 : 0;
}

static int
	OutputA(void* data, char const* c, int len, struct console_colour_stream_s* const stream)
{
	DWORD
		ret = 0;
	WriteConsoleA(data, c, len, &ret, NULL);
	return ret;
}

static int
	OutputW(void* data, wchar_t const* c, int len, struct console_colour_stream_s* const stream)
{
	DWORD
		ret = 0;
	WriteConsoleW(data, c, len, &ret, NULL);
	return ret;
}

static void
	OutputColour(void* data, unsigned short colour, struct console_colour_stream_s* const stream)
{
	SetConsoleTextAttribute(data, colour);
}

static struct console_colour_call_s
	gConsoleStreamCall = {
		&OutputC,
		&OutputA,
		&OutputW,
		&OutputColour,
	};

static struct console_colour_stream_s
	gStream = {
		&gConsoleStreamCall,
		&gConsoleStreamState,
	};

extern "C"
{
	BOOL WINAPI
		Hook_WriteConsoleA(
			_In_ HANDLE hConsoleOutput,
			_In_reads_(nNumberOfCharsToWrite) CONST VOID* lpBuffer,
			_In_ DWORD nNumberOfCharsToWrite,
			_Out_opt_ LPDWORD lpNumberOfCharsWritten,
			_Reserved_ LPVOID lpReserved
		)
	{
		if (nNumberOfCharsToWrite == 0)
		{
			if (lpNumberOfCharsWritten)
			{
				*lpNumberOfCharsWritten = 0;
			}
			return TRUE;
		}
		gStream.Call->Data = hConsoleOutput;
		int
			num = WriteColouredA((char const*)lpBuffer, nNumberOfCharsToWrite, &gStream);
		if (lpNumberOfCharsWritten)
		{
			*lpNumberOfCharsWritten = nNumberOfCharsToWrite;
		}
		return TRUE;
	}

	BOOL WINAPI
		Hook_WriteConsoleW(
			_In_ HANDLE hConsoleOutput,
			_In_reads_(nNumberOfCharsToWrite) CONST VOID* lpBuffer,
			_In_ DWORD nNumberOfCharsToWrite,
			_Out_opt_ LPDWORD lpNumberOfCharsWritten,
			_Reserved_ LPVOID lpReserved
		)
	{
		if (nNumberOfCharsToWrite == 0)
		{
			if (lpNumberOfCharsWritten)
			{
				*lpNumberOfCharsWritten = 0;
			}
			return TRUE;
		}
		gStream.Call->Data = hConsoleOutput;
		int
			num = WriteColouredW((wchar_t const*)lpBuffer, nNumberOfCharsToWrite, &gStream);
		if (lpNumberOfCharsWritten)
		{
			*lpNumberOfCharsWritten = nNumberOfCharsToWrite;
		}
		return TRUE;
	}

	subhook_t
		WriteConsoleA_ = 0,
		WriteConsoleW_ = 0;

	void
		RemoveStreamHooks()
	{
		subhook_remove(WriteConsoleA_);
		subhook_remove(WriteConsoleW_);
	}

	void
		ReaddStreamHooks()
	{
		subhook_install(WriteConsoleW_);
		subhook_install(WriteConsoleA_);
	}

	CONSOLECOLOUR_API void
		InstallConsoleColour(void)
	{
		CONSOLE_SCREEN_BUFFER_INFO
			info;
		HANDLE
			handle = GetStdHandle(STD_OUTPUT_HANDLE);

		GetConsoleScreenBufferInfo(handle, &info);
		gStream.State->CurrentStyle = gStream.State->DefaultStyle = info.wAttributes;

		if (!WriteConsoleA_)
		{
			WriteConsoleA_ = subhook_new((void*)&WriteConsoleA, (void*)&Hook_WriteConsoleA, SUBHOOK_64BIT_OFFSET);
		}
		if (WriteConsoleA_)
		{
			subhook_install(WriteConsoleA_);
		}
		if (!WriteConsoleW_)
		{
			WriteConsoleW_ = subhook_new((void*)&WriteConsoleW, (void*)&Hook_WriteConsoleW, SUBHOOK_64BIT_OFFSET);
		}
		if (WriteConsoleW_)
		{
			subhook_install(WriteConsoleW_);
		}
	}

	CONSOLECOLOUR_API void
		UninstallConsoleColour(void)
	{
		HANDLE
			handle = GetStdHandle(STD_OUTPUT_HANDLE);
		SetConsoleTextAttribute(handle, gStream.State->DefaultStyle);
		if (WriteConsoleA_)
		{
			subhook_remove(WriteConsoleA_);
			subhook_free(WriteConsoleA_);
			WriteConsoleA_ = 0;
		}
		if (WriteConsoleW_)
		{
			subhook_remove(WriteConsoleW_);
			subhook_free(WriteConsoleW_);
			WriteConsoleW_ = 0;
		}
	}
}

BOOL APIENTRY
	DllMain(HMODULE hModule, DWORD  ul_reason_for_call, LPVOID lpReserved)
{
    return TRUE;
}