SSL_CTX *ctx;	/* SSL Context */
    BIO *bio;		/* Struct for SSL processing */
    BIO *p_bio;		/* Parent BIO (that is layered on Tcl_Channel) */

    char *err;
} State;

/*
 * The following definitions have to be usable for 8.2.0-8.3.1 and 8.3.2+.
 * The differences between these versions:
 *
 * 8.0-8.1:	There is no support for these in TLS 1.4 (get 1.3).  This
 *		was the version with the original patch.
 *
 * 8.2.0-	Changed semantics for Tcl_StackChannel (Tcl_ReplaceChannel).
 * 8.3.1:	Check at runtime to switch the behaviour. The patch is part
 *		of the core from now on.
 *
 * 8.3.2+:	Stacked channels rewritten for better behaviour in some
 *		situations (closing). Some new API's, semantic changes.
 *
 * The following magic was adapted from Trf 2.1 (Kupries).
 */

#define TLS_CHANNEL_VERSION_1	0x1
#define TLS_CHANNEL_VERSION_2	0x2
extern int channelTypeVersion;

#ifdef USE_TCL_STUBS
#ifndef Tcl_StackChannel
/*
 * The core we are compiling against is not patched, so supply the
 * necesssary definitions here by ourselves. The form chosen for
 * the procedure macros (reservedXXX) will notify us if the core
 * does not have these reserved locations anymore.
 *
 * !! Synchronize the procedure indices in their definitions with
 *    the patch to tcl.decls, as they have to be the same.
 */

/* 281 */
typedef Tcl_Channel (tls_StackChannel) _ANSI_ARGS_((Tcl_Interp* interp,
						    Tcl_ChannelType* typePtr,
						    ClientData instanceData,
						    int mask,
						    Tcl_Channel prevChan));
/* 282 */
typedef void (tls_UnstackChannel) _ANSI_ARGS_((Tcl_Interp* interp,
					       Tcl_Channel chan));

#define Tcl_StackChannel     ((tls_StackChannel*) tclStubsPtr->reserved281)
#define Tcl_UnstackChannel ((tls_UnstackChannel*) tclStubsPtr->reserved282)

#endif /* Tcl_StackChannel */

#ifndef Tcl_GetStackedChannel
/*
 * Separate definition, available in 8.2, but not 8.1 and before !
 */

/* 283 */
typedef Tcl_Channel (tls_GetStackedChannel) _ANSI_ARGS_((Tcl_Channel chan));

#define Tcl_GetStackedChannel ((tls_GetStackedChannel*) tclStubsPtr->reserved283)

#endif /* Tcl_GetStackedChannel */


#ifndef TCL_CHANNEL_VERSION_2
/*
 * Core is older than 8.3.2.  Supply the missing definitions for
 * the new API's in 8.3.2.
 */
#define EMULATE_CHANNEL_VERSION_2

typedef struct TlsChannelTypeVersion_* TlsChannelTypeVersion;
#define TCL_CHANNEL_VERSION_2	((TlsChannelTypeVersion) 0x2)

typedef int (TlsDriverHandlerProc) _ANSI_ARGS_((ClientData instanceData,
					int interestMask));
/* 394 */
typedef int (tls_ReadRaw)  _ANSI_ARGS_((Tcl_Channel chan, char *dst,
					int bytesToRead));
/* 395 */
typedef int (tls_WriteRaw) _ANSI_ARGS_((Tcl_Channel chan, char *src,
					int srcLen));
/* 397 */
typedef int (tls_GetTopChannel) _ANSI_ARGS_((Tcl_Channel chan));

/*
 * Generating code for accessing these parts of the stub table when
 * compiling against a core older than 8.3.2 is a hassle because even
 * the 'reservedXXX' fields of the structure are not defined yet. So
 * we have to write up some macros hiding some very hackish pointer
 * arithmetics to get at these fields. We assume that pointer to
 * functions are always of the same size.
 */

#define STUB_BASE   ((char*)(&(tclStubsPtr->tcl_UtfNcasecmp))) /* field 370 */
#define procPtrSize (sizeof (Tcl_DriverBlockModeProc *))
#define IDX(n)      (((n)-370) * procPtrSize)
#define SLOT(n)     (STUB_BASE + IDX(n))

#define Tcl_ReadRaw		(*((tls_ReadRaw**)	(SLOT(394))))
#define Tcl_WriteRaw		(*((tls_WriteRaw**)	(SLOT(395))))
#define Tcl_GetTopChannel	(*((tls_GetTopChannel**)(SLOT(396))))

/*
 * Required, easy emulation.
 */
#define Tcl_ChannelGetOptionProc(chanDriver) ((chanDriver)->getOptionProc)

#endif /* TCL_CHANNEL_VERSION_2 */

#endif /* USE_TCL_STUBS */

/*
 * Forward declarations
 */

Tcl_ChannelType *Tls_ChannelType _ANSI_ARGS_((void));
Tcl_Channel	Tls_GetParent _ANSI_ARGS_((State *statePtr));

Tcl_Obj*		Tls_NewX509Obj _ANSI_ARGS_ (( Tcl_Interp *interp, X509 *cert));
void		Tls_Error _ANSI_ARGS_ ((State *statePtr, char *msg));
void		Tls_Free _ANSI_ARGS_ ((char *blockPtr));
void		Tls_Clean _ANSI_ARGS_ ((State *statePtr));
int		Tls_WaitForConnect _ANSI_ARGS_(( State *statePtr,
							int *errorCodePtr));

BIO *		BIO_new_tcl _ANSI_ARGS_((State* statePtr, int flags));

#endif /* _TLSINT_H */