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IgHook.h

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#ifndef IG_HOOK_IG_HOOK_H
# define IG_HOOK_IG_HOOK_H

//<<<<<< INCLUDES                                                       >>>>>>
//<<<<<< PUBLIC DEFINES                                                 >>>>>>
//<<<<<< PUBLIC CONSTANTS                                               >>>>>>
//<<<<<< PUBLIC TYPES                                                   >>>>>>
//<<<<<< PUBLIC VARIABLES                                               >>>>>>
//<<<<<< PUBLIC FUNCTIONS                                               >>>>>>
//<<<<<< CLASS DECLARATIONS                                             >>>>>>

class IgHook
{
public:
    enum Status
    {
        Success = 0,
        ErrBadOptions,
        ErrLibraryNotFound,
        ErrSymbolNotFoundInLibrary,
        ErrSymbolNotFoundInSelf,
        ErrPrologueNotRecognised,
        ErrPrologueTooLarge,
        ErrMemoryProtection,
        ErrAllocateTrampoline,
        ErrOther
    };

    struct Data
    {
        int             options;
        const char      *function;
        const char      *version;
        const char      *library;
        void            *replacement;
        void            *chain;
        void            *original;
        void            *trampoline;
    };

    template <typename Func>
    struct SafeData
    {
        int             options;
        const char      *function;
        const char      *version;
        const char      *library;
        Func            *replacement;
        Func            *chain;
        Func            *original;
        void            *trampoline;
    };

    template <typename Func>
    union TypedData
    {
        SafeData<Func>  typed;
        Data            raw;
    };

    static Status       hook (Data &data);
    static Status       hook (const char *function,
                              const char *version,
                              const char *library,
                              void *replacement,
                              int options = 0,
                              void **chain = 0,
                              void **original = 0,
                              void **trampoline = 0);
};

//<<<<<< INLINE PUBLIC FUNCTIONS                                        >>>>>>
//<<<<<< INLINE MEMBER FUNCTIONS                                        >>>>>>

inline IgHook::Status
IgHook::hook (Data &data)
{
    return hook (data.function, data.version, data.library, data.replacement,
                 data.options, &data.chain, &data.original, &data.trampoline);
}

#endif // IG_HOOK_IG_HOOK_H

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