/* libUIOHook: Cross-platform keyboard and mouse hooking from userland.
 * Copyright (C) 2006-2022 Alexander Barker.  All Rights Reserved.
 * https://github.com/kwhat/libuiohook/
 *
 * libUIOHook is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published
 * by the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * libUIOHook is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

/***********************************************************************
 * The following code is based on code provided by Marc-André Moreau
 * to work around a failure to support dead keys in the ToUnicode() API.
 * According to the author some parts were taken directly from
 * Microsoft's kbd.h header file that is shipped with the Windows Driver
 * Development Kit.
 *
 * The original code was substantially modified to provide the following:
 *   1) More dynamic code structure.
 *   2) Support for compilers that do not implement _ptr64 (GCC / LLVM).
 *   3) Support for Wow64 at runtime via 32-bit binary.
 *   4) Support for contextual language switching.
 *
 * I have contacted Marc-André Moreau who has granted permission for
 * his original source code to be used under the Public Domain.  Although
 * the libUIOHook library as a whole is currently covered under the LGPLv3,
 * please feel free to use and learn from the source code contained in the
 * following functions under the terms of the Public Domain.
 *
 * For further reading and the original code, please visit:
 *   http://legacy.docdroppers.org/wiki/index.php?title=Writing_Keyloggers
 *   http://www.techmantras.com/content/writing-keyloggers-full-length-tutorial
 *
 ***********************************************************************/

#ifndef _included_input_helper
#define _included_input_helper

#include <limits.h>
#include <windows.h>

#ifndef LPFN_ISWOW64PROCESS
typedef BOOL (WINAPI *LPFN_ISWOW64PROCESS) (HANDLE, PBOOL);
#endif

typedef void* (CALLBACK *KbdLayerDescriptor) (VOID);

#define CAPLOK          0x01
#define WCH_NONE        0xF000
#define WCH_DEAD        0xF001

#ifndef WM_MOUSEHWHEEL
#define WM_MOUSEHWHEEL  0x020E
#endif

typedef struct _VK_TO_WCHARS {
    BYTE VirtualKey;
    BYTE Attributes;
    WCHAR wch[];
} VK_TO_WCHARS, *PVK_TO_WCHARS;

typedef struct _LIGATURE {
    BYTE VirtualKey;
    WORD ModificationNumber;
    WCHAR wch[];
} LIGATURE, *PLIGATURE;

typedef struct _VK_TO_BIT {
    BYTE Vk;
    BYTE ModBits;
} VK_TO_BIT, *PVK_TO_BIT;

typedef struct _MODIFIERS {
    PVK_TO_BIT pVkToBit;                // __ptr64
    WORD wMaxModBits;
    BYTE ModNumber[];
} MODIFIERS, *PMODIFIERS;

typedef struct _VSC_VK {
    BYTE Vsc;
    USHORT Vk;
} VSC_VK, *PVSC_VK;

typedef struct _VK_TO_WCHAR_TABLE {
    PVK_TO_WCHARS pVkToWchars;          // __ptr64
    BYTE nModifications;
    BYTE cbSize;
} VK_TO_WCHAR_TABLE, *PVK_TO_WCHAR_TABLE;

typedef struct _DEADKEY {
    DWORD dwBoth;
    WCHAR wchComposed;
    USHORT uFlags;
} DEADKEY, *PDEADKEY;

typedef struct _VSC_LPWSTR {
    BYTE vsc;
    WCHAR *pwsz;                        // __ptr64
} VSC_LPWSTR, *PVSC_LPWSTR;

typedef struct tagKbdLayer {
    PMODIFIERS pCharModifiers;          // __ptr64
    PVK_TO_WCHAR_TABLE pVkToWcharTable; // __ptr64
    PDEADKEY pDeadKey;                  // __ptr64
    PVSC_LPWSTR pKeyNames;              // __ptr64
    PVSC_LPWSTR pKeyNamesExt;           // __ptr64
    WCHAR **pKeyNamesDead;              // __ptr64
    USHORT *pusVSCtoVK;                 // __ptr64
    BYTE bMaxVSCtoVK;
    PVSC_VK pVSCtoVK_E0;                // __ptr64
    PVSC_VK pVSCtoVK_E1;                // __ptr64
    DWORD fLocaleFlags;
    BYTE nLgMax;
    BYTE cbLgEntry;
    PLIGATURE pLigature;                // __ptr64
    DWORD dwType;
    DWORD dwSubType;
} KBDTABLES, *PKBDTABLES;               // __ptr64


extern SIZE_T keycode_to_unicode(DWORD keycode, PWCHAR buffer, SIZE_T size);

//extern DWORD unicode_to_keycode(wchar_t unicode);

extern unsigned short keycode_to_scancode(DWORD vk_code, DWORD flags);

extern DWORD scancode_to_keycode(unsigned short scancode);

// Initialize the locale list and wow64 pointer size.
extern int load_input_helper();

// Cleanup the initialized locales.
extern int unload_input_helper();

#endif