wahook.h

/*
  Ïåðåõâàò WinAPI.
*/
#pragma once

namespace WaHook
{
  /*
    Èíèöèàëèçàöèÿ.
  */
  void init(void);

  /*
    Äåèíèöèàëèçàöèÿ.
  */
  void uninit(void);

  /*
    Êýýëáåê äëÿ _hook().

    IN functionForHook  - óêàçàòåëü íà ôóíêöèþ, êîòîðàÿ áóäåò ïåðåõâà÷åíà.
    IN originalFunction - àäðåñ, ïî êîòîðîìó óæå çàïèñàíî ñòàðîå ñîäåðæèìîå ôóíêöèè, ýòîò àäðåñ
                          íåîáõîäèìî âûçûâàòü äëÿ âûçîâà îðèãèíàëüíîé ôóíêöèè ïîñëå óñòàíîâêè õóêà.
  */
  typedef void (*HOTPATCHCALLBACK)(const void *functionForHook, const void *originalFunction);
  
  /*
    Óñòàíîâêà õóêà.

    IN process             - ïðîöåññ, â êîòîðîì ïðîèñõîäèò ìîäèôèêàöèÿ.
    IN OUT functionForHook - óêàçàòåëü íà ôóíêöèþ, êîòîðàÿ áóäåò ïåðåõâà÷åíà.
    IN hookerFunction      - óêàçàòåëü íà íîâóþ ôóíêöèþ.
    OUT originalFunction   - àäðåñ, ïî êîòîðîìó áóäåò çàïèñàíî ñòàðîå ñîäåðæèìîå ôóíêöèè, ýòîò àäðåñ
                             íåîáõîäèìî âûçûâàòü äëÿ âûçîâà îðèãèíàëüíîé ôóíêöèè ïîñëå óñòàíîâêè
                             õóêà.
    IN hotPatchCallback    - ôóíêöèÿ, êîòîðàÿ âûçûâàåòñÿ íåìåäëåííî ïåðåä çàïèñüþ õóêà â
                             îðèãèíàëüíóþ ôóíêöèþ.
    
    Return                 - ðàçìåð äàííûõ ïîìåøåííûõ ïî àäðåñó originalFunction, èëè 0 â ñëó÷àè
                             îøèáêè.
  */
  DWORD _hook(HANDLE process, void *functionForHook, void *hookerFunction, void *originalFunction, HOTPATCHCALLBACK hotPatchCallback);

  /*
    Ñíÿòèå õóêà.

    IN process             - ïðîöåññ, â êîòîðîì ïðîèñõîäèò ìîäèôèêàöèÿ.
    IN OUT functionForHook - óêàçàòåëü íà ïåðåõâà÷åíóþ ôóíêöèþ.
    IN originalFunction    - àäðåñ ïî êîòîðîìó çàïèñàíû îðèãàíëüíûå îïêîäû.
    IN size                - ðàçìåð originalFunction.

    Return                 - true - â ñëó÷àè óñïåõà,
                             false - â ñëó÷àè îøèáêè.
  */
  bool _unhook(HANDLE process, void *hookedFunction, void *originalFunction, DWORD size);

  /*
    Ïðîâåðÿåò ÿâëÿåòñÿ ëè ôóíêöèÿ ïåðõâà÷åííîé, ñ÷èòûâàÿ ïåðâûå îïêîäû.

    IN process  - ïðîöåññ
    IN function - ôóíêöèÿ.

    Return      - true - ïåðåõâà÷åíà,
                  false - íå ïåðåõâà÷åíà.
  */
  bool _isHooked(HANDLE process, void *function);
  
  /*    Allocates a region of memory where you can make replacement parts intercepted functions.
    
    IN process - a process in which the modification.
    IN maxFunctions - approximate kolichetsvo features that will be intercepted.
    
    Return - address, or NULL in case of error.
  */
  void *_allocBuffer(HANDLE process, DWORD maxFunctions);
};