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System.h

// The following ifdef block is the standard way of creating macros which make exporting 
// from a DLL simpler. All files within this DLL are compiled with the SYSTEM_EXPORTS
// symbol defined on the command line. this symbol should not be defined on any project
// that uses this DLL. This way any other project whose source files include this file see 
// SYSTEM_API functions as being imported from a DLL, whereas this DLL sees symbols
// defined with this macro as being exported.
#pragma once

#ifdef SYSTEM_EXPORTS
#define SYSTEM_API __declspec(dllexport)
#else
#define SYSTEM_API __declspec(dllimport)
#endif

#define NEW_STACK_SIZE     256*256

// Proc types:
#define PT_NOTHING      0
#define PT_PROC         1
#define PT_STRUCT       2
#define PT_VTABLEPROC   3

// Proc results:
#define PR_OK           0
#define PR_ERROR        -1
#define PR_CALLBACK     1

// Real world argument types
#define     PAT_VOID          0
#define PAT_INT             1
#define     PAT_LONG          2
#define PAT_STRING          3
#define PAT_WSTRING         4
#define PAT_GUID      5
#define PAT_CALLBACK    6

// Input/Output Source/Destination
#define     IOT_NONE    0
#define     IOT_STACK   -1
#define     IOT_REG           1
#define IOT_INLINE  (__INST_LAST+1) // should replace pointer to inline input
// #define INLINE_INPUT -> any other value, will contain pointer to input string

// Options
#define POPT_CDECL      0x1    // (Option & 0x1) == 0x1 -> cdecl, otherwise stdcall
#define POPT_PERMANENT  0x2    // Permanent proc, will not be destroyed after calling
#define POPT_ALWRETURN  0x4    // Always return
#define POPT_NEVERREDEF 0x8    // Never redefine
#define POPT_GENSTACK   0x10   // Use general stack (non temporary for callback)
#define POPT_ERROR      0x20   // Call GetLastError after proc and push it to stack
#define POPT_UNLOAD     0x40   // unload dll after call
#define POPT_CLONE      0x80   // This is clone callback

// Our single proc parameter
typedef struct
{
      int Type;
      int Option; // -1 -> Pointer, 1-... -> Special+1

    // if you'll change ProcParameter or SystemProc structure - update this value
#define  SYSTEM_ZERO_PARAM_VALUE_OFFSET 0x820

      int Value;  // it can hold any 4 byte value 
    int _value; // value buffer for structures > 4 bytes (I hope 8 bytes will be enough)
    int Size; // Value real size (should be either 1 or 2 (the number of pushes))
    int Input;
      int Output;
    HGLOBAL allocatedBlock; // block allocated for passing string, wstring or guid param
} ProcParameter;

// Our single proc (Since the user will free proc with GlobalFree, 
// I've declared all variables as statics)
typedef struct tag_SystemProc SystemProc;
typedef struct tag_SystemProc
{
      int ProcType;
    int ProcResult;
    char DllName[1024];
    char ProcName[1024];
      HANDLE Dll;
      HANDLE Proc;
    int Options;
      int ParamCount;
    // if you'll change ProcParameter or SystemProc structure - update SYSTEM_ZERO_PARAM_VALUE_OFFSET value
      ProcParameter Params[100];    // I hope nobody will use more than 100 params

    // Callback specific
    int CallbackIndex;
    int ArgsSize;
    // Clone of current element (used for multi-level callbacks)
    SystemProc *Clone;
} SystemProc;

extern const int ParamSizeByType[];   // Size of every parameter type (*4 bytes)

extern HANDLE CreateCallback(SystemProc *cbproc);
extern SystemProc *PrepareProc(BOOL NeedForCall);
extern void ParamAllocate(SystemProc *proc);
extern void ParamsDeAllocate(SystemProc *proc);
extern void ParamsIn(SystemProc *proc);
extern void ParamsOut(SystemProc *proc);
extern SystemProc *CallProc(SystemProc *proc);
extern SystemProc *CallBack(SystemProc *proc);
extern SystemProc *RealCallBack();
extern void CallStruct(SystemProc *proc);

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