// source file line data structure
typedef struct _IMAGEHLP_LINE
{
    DWORD SizeOfStruct;           // set to sizeof(IMAGEHLP_LINE)
    DWORD Key;                    // internal
    DWORD LineNumber;             // line number in file
    PCHAR FileName;               // full filename
    DWORD Address;                // first instruction of line
} IMAGEHLP_LINE, *PIMAGEHLP_LINE;

#ifndef SYMOPT_LOAD_LINES
#define SYMOPT_LOAD_LINES        0x00000010
#endif  // SYMOPT_LOAD_LINES

#ifndef SYMOPT_OMAP_FIND_NEAREST
#define SYMOPT_OMAP_FIND_NEAREST 0x00000020
#endif  // SYMOPT_OMAP_FIND_NEAREST

// Typedefs for the new source and line functions.
typedef
BOOL (__stdcall *PFNSYMGETLINEFROMADDR)
                              ( IN  HANDLE         hProcess         ,
                                IN  DWORD          dwAddr           ,
                                OUT PDWORD         pdwDisplacement  ,
                                OUT PIMAGEHLP_LINE Line              ) ;
typedef
BOOL (__stdcall *PFNSYMGETLINEFROMNAME)
                              ( IN     HANDLE         hProcess      ,
                                IN     LPSTR          ModuleName    ,
                                IN     LPSTR          FileName      ,
                                IN     DWORD          dwLineNumber  ,
                                OUT    PLONG          plDisplacement,
                                IN OUT PIMAGEHLP_LINE Line           ) ;
typedef
BOOL (__stdcall *PFNSYMGETLINENEXT) ( IN     HANDLE         hProcess ,
                                      IN OUT PIMAGEHLP_LINE Line      );
typedef
BOOL (__stdcall *PFNSYMGETLINEPREV) ( IN     HANDLE         hProcess ,
                                      IN OUT PIMAGEHLP_LINE Line      );
typedef
BOOL (__stdcall *PFNSYMMATCHFILENAME) ( IN  LPSTR   FileName      ,
                                        IN  LPSTR   Match         ,
                                        OUT LPSTR * FileNameStop  ,
                                        OUT LPSTR * MatchStop      ) ;

// The function pointers to the new symbol engine source and line
//  functions.
PFNSYMGETLINEFROMADDR   m_pfnSymGetLineFromAddr ;
PFNSYMGETLINEFROMNAME   m_pfnSymGetLineFromName ;
PFNSYMGETLINENEXT       m_pfnSymGetLineNext     ;
PFNSYMGETLINEPREV       m_pfnSymGetLinePrev     ;
PFNSYMMATCHFILENAME     m_pfnSymMatchFileName   ;

VOID SymbolEngineInit ( void )
{
        HINSTANCE hInstImageHlp = GetModuleHandleA ( "IMAGEHLP.DLL" ) ;

        m_pfnSymGetLineFromAddr =
            (PFNSYMGETLINEFROMADDR)GetProcAddress(hInstImageHlp ,
                                                  "SymGetLineFromAddr");
        if ( NULL == m_pfnSymGetLineFromAddr )
        {
            m_pfnSymGetLineFromName = NULL ;
            m_pfnSymGetLineNext     = NULL ;
            m_pfnSymGetLinePrev     = NULL ;
            m_pfnSymMatchFileName   = NULL ;
        }
        else
        {
            m_pfnSymGetLineFromName =
               (PFNSYMGETLINEFROMNAME)GetProcAddress(hInstImageHlp ,
                                                  "SymGetLineFromName");
            m_pfnSymGetLineNext     =
               (PFNSYMGETLINENEXT)GetProcAddress ( hInstImageHlp  ,
                                                   "SymGetLineNext" ) ;
            m_pfnSymGetLinePrev     =
               (PFNSYMGETLINEPREV)GetProcAddress ( hInstImageHlp  ,
                                                   "SymGetLinePrev"  ) ;
            m_pfnSymMatchFileName   =
               (PFNSYMMATCHFILENAME)GetProcAddress (hInstImageHlp ,
                                                    "SymMatchFileName");
        }
}

BOOL SymGetLineFromAddr ( IN HANDLE	m_hProcess,
							  IN  DWORD          dwAddr          ,
                              OUT PDWORD         pdwDisplacement ,
                              OUT PIMAGEHLP_LINE Line             )
{
        if ( NULL == m_pfnSymGetLineFromAddr )
        {
            return ( FALSE ) ;
        }
        // Just return whatever the main function returned.
        return ( m_pfnSymGetLineFromAddr( m_hProcess      ,
                            dwAddr          ,
                            pdwDisplacement ,
                            Line             ) ) ;
}

BOOL SymGetLineFromName ( IN HANDLE	m_hProcess,
							IN     LPSTR          ModuleName      ,
                              IN     LPSTR          FileName        ,
                              IN     DWORD          dwLineNumber    ,
                              OUT    PLONG          plDisplacement  ,
                              IN OUT PIMAGEHLP_LINE Line             )
{
        if ( NULL == m_pfnSymGetLineFromName )
        {
            return ( FALSE ) ;
        }
        return ( m_pfnSymGetLineFromName ( m_hProcess       ,
                                           ModuleName       ,
                                           FileName         ,
                                           dwLineNumber     ,
                                           plDisplacement   ,
                                           Line              ) ) ;
}

BOOL SymGetLineNext ( IN HANDLE	m_hProcess,IN OUT PIMAGEHLP_LINE Line )
{
        if ( NULL == m_pfnSymGetLineNext )
        {
            return ( FALSE ) ;
        }
        return ( m_pfnSymGetLineNext ( m_hProcess , Line ) ) ;
}

BOOL SymGetLinePrev ( IN HANDLE	m_hProcess,IN OUT PIMAGEHLP_LINE Line )
{
        if ( NULL == m_pfnSymGetLinePrev )
        {
            return ( FALSE ) ;
        }
        return ( m_pfnSymGetLinePrev ( m_hProcess , Line ) ) ;
}

// What is this?
BOOL SymMatchFileName ( IN  LPSTR   FileName        ,
                            IN  LPSTR   Match           ,
                            OUT LPSTR * FileNameStop    ,
                            OUT LPSTR * MatchStop        )
{
        if ( NULL == m_pfnSymMatchFileName )
        {
            return ( FALSE ) ;
        }
        return ( m_pfnSymMatchFileName ( FileName       ,
                                         Match          ,
                                         FileNameStop   ,
                                         MatchStop       ) ) ;
}