// MyCom.h

#ifndef ZIP7_INC_MY_COM_H
#define ZIP7_INC_MY_COM_H

#include "MyWindows.h"
#include "MyTypes.h"

template <class T>
class CMyComPtr
{
  T* _p;
public:
  CMyComPtr(): _p(NULL) {}
  CMyComPtr(T* p) throw() { if ((_p = p) != NULL) p->AddRef(); }
  CMyComPtr(const CMyComPtr<T>& lp) throw() { if ((_p = lp._p) != NULL) _p->AddRef(); }
  ~CMyComPtr() { if (_p) _p->Release(); }
  void Release() { if (_p) { _p->Release(); _p = NULL; } }
  operator T*() const {  return (T*)_p;  }
  // T& operator*() const {  return *_p; }
  T** operator&() { return &_p; }
  T* operator->() const { return _p; }
  T* operator=(T* p)
  {
    if (p)
      p->AddRef();
    if (_p)
      _p->Release();
    _p = p;
    return p;
  }
  T* operator=(const CMyComPtr<T>& lp) { return (*this = lp._p); }
  bool operator!() const { return (_p == NULL); }
  // bool operator==(T* pT) const {  return _p == pT; }
  void Attach(T* p2)
  {
    Release();
    _p = p2;
  }
  T* Detach()
  {
    T* pt = _p;
    _p = NULL;
    return pt;
  }
  #ifdef _WIN32
  HRESULT CoCreateInstance(REFCLSID rclsid, REFIID iid, LPUNKNOWN pUnkOuter = NULL, DWORD dwClsContext = CLSCTX_ALL)
  {
    return ::CoCreateInstance(rclsid, pUnkOuter, dwClsContext, iid, (void**)&_p);
  }
  #endif
  /*
  HRESULT CoCreateInstance(LPCOLESTR szProgID, LPUNKNOWN pUnkOuter = NULL, DWORD dwClsContext = CLSCTX_ALL)
  {
    CLSID clsid;
    HRESULT hr = CLSIDFromProgID(szProgID, &clsid);
    ATLASSERT(_p == NULL);
    if (SUCCEEDED(hr))
      hr = ::CoCreateInstance(clsid, pUnkOuter, dwClsContext, __uuidof(T), (void**)&_p);
    return hr;
  }
  */
  template <class Q>
  HRESULT QueryInterface(REFGUID iid, Q** pp) const throw()
  {
    // if (*pp) throw 20220216; // for debug
    return _p->QueryInterface(iid, (void**)pp);
  }
};

#define Z7_DECL_CMyComPtr_QI_FROM(i, v, unk) \
  CMyComPtr<i> v; (unk)->QueryInterface(IID_ ## i, (void **)&v);


//////////////////////////////////////////////////////////

inline HRESULT StringToBstr(LPCOLESTR src, BSTR *bstr)
{
  *bstr = ::SysAllocString(src);
  return (*bstr) ? S_OK : E_OUTOFMEMORY;
}

class CMyComBSTR
{
  BSTR m_str;
  Z7_CLASS_NO_COPY(CMyComBSTR)
public:
  CMyComBSTR(): m_str(NULL) {}
  ~CMyComBSTR() { ::SysFreeString(m_str); }
  BSTR* operator&() { return &m_str; }
  operator LPCOLESTR() const { return m_str; }
  // operator bool() const { return m_str != NULL; }
  // bool operator!() const { return m_str == NULL; }

  void Wipe_and_Free()
  {
    if (m_str)
    {
      memset(m_str, 0, ::SysStringLen(m_str) * sizeof(*m_str));
      Empty();
    }
  }

private:
  // operator BSTR() const { return m_str; }

  CMyComBSTR(LPCOLESTR src) { m_str = ::SysAllocString(src); }
  // CMyComBSTR(int nSize) { m_str = ::SysAllocStringLen(NULL, nSize); }
  // CMyComBSTR(int nSize, LPCOLESTR sz) { m_str = ::SysAllocStringLen(sz, nSize);  }
  // CMyComBSTR(const CMyComBSTR& src) { m_str = src.MyCopy(); }
  
  /*
  CMyComBSTR(REFGUID src)
  {
    LPOLESTR szGuid;
    StringFromCLSID(src, &szGuid);
    m_str = ::SysAllocString(szGuid);
    CoTaskMemFree(szGuid);
  }
  */
  
  /*
  CMyComBSTR& operator=(const CMyComBSTR& src)
  {
    if (m_str != src.m_str)
    {
      if (m_str)
        ::SysFreeString(m_str);
      m_str = src.MyCopy();
    }
    return *this;
  }
  */
  
  CMyComBSTR& operator=(LPCOLESTR src)
  {
    ::SysFreeString(m_str);
    m_str = ::SysAllocString(src);
    return *this;
  }
  
  unsigned Len() const { return ::SysStringLen(m_str); }

  BSTR MyCopy() const
  {
    // We don't support Byte BSTRs here
    return ::SysAllocStringLen(m_str, ::SysStringLen(m_str));
    /*
    UINT byteLen = ::SysStringByteLen(m_str);
    BSTR res = ::SysAllocStringByteLen(NULL, byteLen);
    if (res && byteLen != 0 && m_str)
      memcpy(res, m_str, byteLen);
    return res;
    */
  }
  
  /*
  void Attach(BSTR src) { m_str = src; }
  BSTR Detach()
  {
    BSTR s = m_str;
    m_str = NULL;
    return s;
  }
  */

  void Empty()
  {
    ::SysFreeString(m_str);
    m_str = NULL;
  }
};


class CMyComBSTR_Wipe: public CMyComBSTR
{
  Z7_CLASS_NO_COPY(CMyComBSTR_Wipe)
public:
  CMyComBSTR_Wipe(): CMyComBSTR() {}
  ~CMyComBSTR_Wipe() { Wipe_and_Free(); }
};



/*
  If CMyUnknownImp doesn't use virtual destructor, the code size is smaller.
  But if some class_1 derived from CMyUnknownImp
    uses Z7_COM_ADDREF_RELEASE and IUnknown::Release()
    and some another class_2 is derived from class_1,
    then class_1 must use virtual destructor:
      virtual ~class_1();
    In that case, class_1::Release() calls correct destructor of class_2.
  We can use virtual ~CMyUnknownImp() to disable warning
    "class has virtual functions, but destructor is not virtual".
  Also we can use virtual ~IUnknown() {} in MyWindows.h
*/

class CMyUnknownImp
{
  Z7_CLASS_NO_COPY(CMyUnknownImp)
protected:
  ULONG _m_RefCount;
  CMyUnknownImp(): _m_RefCount(0) {}

  #ifdef _WIN32
  #if defined(__GNUC__) || defined(__clang__)
  // virtual ~CMyUnknownImp() {} // to disable GCC/CLANG warnings
  #endif
  #endif
};



#define Z7_COM_QI_BEGIN \
  private: STDMETHOD(QueryInterface) (REFGUID iid, void **outObject) throw() Z7_override Z7_final \
    { *outObject = NULL;

#define Z7_COM_QI_ENTRY(i) \
  else if (iid == IID_ ## i) \
    { i *ti = this;  *outObject = ti; }
//   { *outObject = (void *)(i *)this; }

#define Z7_COM_QI_ENTRY_UNKNOWN_0 \
  if (iid == IID_IUnknown) \
    { IUnknown *tu = this;  *outObject = tu; }

#define Z7_COM_QI_ENTRY_UNKNOWN(i) \
  if (iid == IID_IUnknown) \
    { i *ti = this;  IUnknown *tu = ti;  *outObject = tu; }
//    { *outObject = (void *)(IUnknown *)(i *)this; }

#define Z7_COM_QI_BEGIN2(i) \
  Z7_COM_QI_BEGIN \
  Z7_COM_QI_ENTRY_UNKNOWN(i) \
  Z7_COM_QI_ENTRY(i)

#define Z7_COM_QI_END \
  else return E_NOINTERFACE; \
  ++_m_RefCount; /* AddRef(); */ return S_OK; }

#define Z7_COM_ADDREF_RELEASE \
  private: \
  STDMETHOD_(ULONG, AddRef)() throw() Z7_override Z7_final \
    { return ++_m_RefCount; } \
  STDMETHOD_(ULONG, Release)() throw() Z7_override Z7_final \
    { if (--_m_RefCount != 0) return _m_RefCount;  delete this;  return 0; } \

#define Z7_COM_UNKNOWN_IMP_SPEC(i) \
  Z7_COM_QI_BEGIN \
  i \
  Z7_COM_QI_END \
  Z7_COM_ADDREF_RELEASE


#define Z7_COM_UNKNOWN_IMP_0 \
  Z7_COM_QI_BEGIN \
  Z7_COM_QI_ENTRY_UNKNOWN_0 \
  Z7_COM_QI_END \
  Z7_COM_ADDREF_RELEASE

#define Z7_COM_UNKNOWN_IMP_1(i) \
  Z7_COM_UNKNOWN_IMP_SPEC( \
  Z7_COM_QI_ENTRY_UNKNOWN(i) \
  Z7_COM_QI_ENTRY(i) \
  )

#define Z7_COM_UNKNOWN_IMP_2(i1, i2) \
  Z7_COM_UNKNOWN_IMP_SPEC( \
  Z7_COM_QI_ENTRY_UNKNOWN(i1) \
  Z7_COM_QI_ENTRY(i1) \
  Z7_COM_QI_ENTRY(i2) \
  )

#define Z7_COM_UNKNOWN_IMP_3(i1, i2, i3) \
  Z7_COM_UNKNOWN_IMP_SPEC( \
  Z7_COM_QI_ENTRY_UNKNOWN(i1) \
  Z7_COM_QI_ENTRY(i1) \
  Z7_COM_QI_ENTRY(i2) \
  Z7_COM_QI_ENTRY(i3) \
  )

#define Z7_COM_UNKNOWN_IMP_4(i1, i2, i3, i4) \
  Z7_COM_UNKNOWN_IMP_SPEC( \
  Z7_COM_QI_ENTRY_UNKNOWN(i1) \
  Z7_COM_QI_ENTRY(i1) \
  Z7_COM_QI_ENTRY(i2) \
  Z7_COM_QI_ENTRY(i3) \
  Z7_COM_QI_ENTRY(i4) \
  )

#define Z7_COM_UNKNOWN_IMP_5(i1, i2, i3, i4, i5) \
  Z7_COM_UNKNOWN_IMP_SPEC( \
  Z7_COM_QI_ENTRY_UNKNOWN(i1) \
  Z7_COM_QI_ENTRY(i1) \
  Z7_COM_QI_ENTRY(i2) \
  Z7_COM_QI_ENTRY(i3) \
  Z7_COM_QI_ENTRY(i4) \
  Z7_COM_QI_ENTRY(i5) \
  )

#define Z7_COM_UNKNOWN_IMP_6(i1, i2, i3, i4, i5, i6) \
  Z7_COM_UNKNOWN_IMP_SPEC( \
  Z7_COM_QI_ENTRY_UNKNOWN(i1) \
  Z7_COM_QI_ENTRY(i1) \
  Z7_COM_QI_ENTRY(i2) \
  Z7_COM_QI_ENTRY(i3) \
  Z7_COM_QI_ENTRY(i4) \
  Z7_COM_QI_ENTRY(i5) \
  Z7_COM_QI_ENTRY(i6) \
  )

#define Z7_COM_UNKNOWN_IMP_7(i1, i2, i3, i4, i5, i6, i7) \
  Z7_COM_UNKNOWN_IMP_SPEC( \
  Z7_COM_QI_ENTRY_UNKNOWN(i1) \
  Z7_COM_QI_ENTRY(i1) \
  Z7_COM_QI_ENTRY(i2) \
  Z7_COM_QI_ENTRY(i3) \
  Z7_COM_QI_ENTRY(i4) \
  Z7_COM_QI_ENTRY(i5) \
  Z7_COM_QI_ENTRY(i6) \
  Z7_COM_QI_ENTRY(i7) \
  )


#define Z7_IFACES_IMP_UNK_1(i1) \
  Z7_COM_UNKNOWN_IMP_1(i1) \
  Z7_IFACE_COM7_IMP(i1) \

#define Z7_IFACES_IMP_UNK_2(i1, i2) \
  Z7_COM_UNKNOWN_IMP_2(i1, i2) \
  Z7_IFACE_COM7_IMP(i1) \
  Z7_IFACE_COM7_IMP(i2) \

#define Z7_IFACES_IMP_UNK_3(i1, i2, i3) \
  Z7_COM_UNKNOWN_IMP_3(i1, i2, i3) \
  Z7_IFACE_COM7_IMP(i1) \
  Z7_IFACE_COM7_IMP(i2) \
  Z7_IFACE_COM7_IMP(i3) \

#define Z7_IFACES_IMP_UNK_4(i1, i2, i3, i4) \
  Z7_COM_UNKNOWN_IMP_4(i1, i2, i3, i4) \
  Z7_IFACE_COM7_IMP(i1) \
  Z7_IFACE_COM7_IMP(i2) \
  Z7_IFACE_COM7_IMP(i3) \
  Z7_IFACE_COM7_IMP(i4) \

#define Z7_IFACES_IMP_UNK_5(i1, i2, i3, i4, i5) \
  Z7_COM_UNKNOWN_IMP_5(i1, i2, i3, i4, i5) \
  Z7_IFACE_COM7_IMP(i1) \
  Z7_IFACE_COM7_IMP(i2) \
  Z7_IFACE_COM7_IMP(i3) \
  Z7_IFACE_COM7_IMP(i4) \
  Z7_IFACE_COM7_IMP(i5) \

#define Z7_IFACES_IMP_UNK_6(i1, i2, i3, i4, i5, i6) \
  Z7_COM_UNKNOWN_IMP_6(i1, i2, i3, i4, i5, i6) \
  Z7_IFACE_COM7_IMP(i1) \
  Z7_IFACE_COM7_IMP(i2) \
  Z7_IFACE_COM7_IMP(i3) \
  Z7_IFACE_COM7_IMP(i4) \
  Z7_IFACE_COM7_IMP(i5) \
  Z7_IFACE_COM7_IMP(i6) \


#define Z7_CLASS_IMP_COM_0(c) \
  Z7_class_final(c) : \
  public IUnknown, \
  public CMyUnknownImp { \
  Z7_COM_UNKNOWN_IMP_0 \
  private:

#define Z7_CLASS_IMP_COM_1(c, i1) \
  Z7_class_final(c) : \
  public i1, \
  public CMyUnknownImp { \
  Z7_IFACES_IMP_UNK_1(i1) \
  private:

#define Z7_CLASS_IMP_COM_2(c, i1, i2) \
  Z7_class_final(c) : \
  public i1, \
  public i2, \
  public CMyUnknownImp { \
  Z7_IFACES_IMP_UNK_2(i1, i2) \
  private:

#define Z7_CLASS_IMP_COM_3(c, i1, i2, i3) \
  Z7_class_final(c) : \
  public i1, \
  public i2, \
  public i3, \
  public CMyUnknownImp { \
  Z7_IFACES_IMP_UNK_3(i1, i2, i3) \
  private:

#define Z7_CLASS_IMP_COM_4(c, i1, i2, i3, i4) \
  Z7_class_final(c) : \
  public i1, \
  public i2, \
  public i3, \
  public i4, \
  public CMyUnknownImp { \
  Z7_IFACES_IMP_UNK_4(i1, i2, i3, i4) \
  private:

#define Z7_CLASS_IMP_COM_5(c, i1, i2, i3, i4, i5) \
  Z7_class_final(c) : \
  public i1, \
  public i2, \
  public i3, \
  public i4, \
  public i5, \
  public CMyUnknownImp { \
  Z7_IFACES_IMP_UNK_5(i1, i2, i3, i4, i5) \
  private:

#define Z7_CLASS_IMP_COM_6(c, i1, i2, i3, i4, i5, i6) \
  Z7_class_final(c) : \
  public i1, \
  public i2, \
  public i3, \
  public i4, \
  public i5, \
  public i6, \
  public CMyUnknownImp { \
  Z7_IFACES_IMP_UNK_6(i1, i2, i3, i4, i5, i6) \
  private:


/*
#define Z7_CLASS_IMP_NOQIB_0(c) \
  Z7_class_final(c) : \
  public IUnknown, \
  public CMyUnknownImp { \
  Z7_COM_UNKNOWN_IMP_0 \
  private:
*/

#define Z7_CLASS_IMP_NOQIB_1(c, i1) \
  Z7_class_final(c) : \
  public i1, \
  public CMyUnknownImp { \
  Z7_COM_UNKNOWN_IMP_0 \
  Z7_IFACE_COM7_IMP(i1) \
  private:

#define Z7_CLASS_IMP_NOQIB_2(c, i1, i2) \
  Z7_class_final(c) : \
  public i1, \
  public i2, \
  public CMyUnknownImp { \
  Z7_COM_UNKNOWN_IMP_1(i2) \
  Z7_IFACE_COM7_IMP(i1) \
  Z7_IFACE_COM7_IMP(i2) \
  private:

#define Z7_CLASS_IMP_NOQIB_3(c, i1, i2, i3) \
  Z7_class_final(c) : \
  public i1, \
  public i2, \
  public i3, \
  public CMyUnknownImp { \
  Z7_COM_UNKNOWN_IMP_2(i2, i3) \
  Z7_IFACE_COM7_IMP(i1) \
  Z7_IFACE_COM7_IMP(i2) \
  Z7_IFACE_COM7_IMP(i3) \
  private:

#define Z7_CLASS_IMP_NOQIB_4(c, i1, i2, i3, i4) \
  Z7_class_final(c) : \
  public i1, \
  public i2, \
  public i3, \
  public i4, \
  public CMyUnknownImp { \
  Z7_COM_UNKNOWN_IMP_3(i2, i3, i4) \
  Z7_IFACE_COM7_IMP(i1) \
  Z7_IFACE_COM7_IMP(i2) \
  Z7_IFACE_COM7_IMP(i3) \
  Z7_IFACE_COM7_IMP(i4) \

/*
#define Z7_CLASS_IMP_NOQIB_5(c, i1, i2, i3, i4, i5) \
  Z7_class_final(c) : \
  public i1, \
  public i2, \
  public i3, \
  public i4, \
  public i5, \
  public CMyUnknownImp { \
  Z7_COM_UNKNOWN_IMP_4(i2, i3, i4, i5) \
  Z7_IFACE_COM7_IMP(i1) \
  Z7_IFACE_COM7_IMP(i2) \
  Z7_IFACE_COM7_IMP(i3) \
  Z7_IFACE_COM7_IMP(i4) \
  Z7_IFACE_COM7_IMP(i5) \
*/


#define Z7_CLASS_IMP_IInStream(c) \
  class c Z7_final : \
  public IInStream, \
  public CMyUnknownImp { \
  Z7_IFACES_IMP_UNK_2(ISequentialInStream, IInStream) \


#define k_My_HRESULT_WritingWasCut 0x20000010

#endif