/*
 * Interface to the "zlib" compression library
 *
 *
 * Copyright (C) 2004, 2005 by Pascal Scheffers <pascal@scheffers.net>
 * Copyright (C) 2005 Unitas Software B.V.
 *
 * Created on 17 December 2004
 *
 * See the file "license.terms" for information on usage and redistribution
 * of this file, and for a DISCLAIMER OF ALL WARRANTIES.
 *
 * 
 */

#ifndef TCL_ZLIB_H
#define TCL_ZLIB_H

#include <tcl.h>

#ifdef BUILD_zlib
#undef TCL_STORAGE_CLASS
#define TCL_STORAGE_CLASS DLLEXPORT
#endif /* BUILD_zlib */

typedef struct ZlibHandleStruct *ZlibHandle;

EXTERN CONST char *     Zlib_InitStubs _ANSI_ARGS_((Tcl_Interp *interp,
                            CONST char *version, int exact));

EXTERN       int        Zlib_Init _ANSI_ARGS_((Tcl_Interp *interp)) ;




#ifndef USE_TCL_STUBS

/*
 * When not using stubs, make it a macro.
 */

#define Zlib_InitStubs(interp, version, exact) \
    Tcl_PkgRequire(interp, "zlib", version, exact)

#endif /* USE_TCL_STUBS */

/*
 * Windows needs to know which symbols to export.  Unix does not.
 * BUILD_zlib should be undefined for Unix.
 */


#include "zlibDecls.h"

#ifdef UNUSED

int Zlib_Deflate _ANSI_ARGS_((Tcl_Interp *interp, int format,
				    Tcl_Obj *data, int level));

int Zlib_Inflate _ANSI_ARGS_((Tcl_Interp *interp, int format,
			      Tcl_Obj *data, int buffersize));

unsigned int 
Zlib_CRC32 _ANSI_ARGS_((unsigned int crc, const char *buf, unsigned int len));

unsigned int 
Zlib_Adler32 _ANSI_ARGS_((unsigned int adler, const char *buf, unsigned int len));

int Zlib_StreamInit _ANSI_ARGS_((Tcl_Interp *interp, int mode,
                                int format, int level, int *zshandle));
Tcl_Obj * Zlib_StreamGetCommandName _ANSI_ARGS_((int zshandle)); 

int Zlib_StreamEof _ANSI_ARGS_((int zshandle)); 

int Zlib_StreamAdler32 _ANSI_ARGS_((int zshandle)); 

int Zlib_StreamPut _ANSI_ARGS_((int zshandle, Tcl_Obj *data, int flush)); 

int Zlib_StreamGet _ANSI_ARGS_((int zshandle, Tcl_Obj *data, int count)); 

int Zlib_StreamClose _ANSI_ARGS_((int zshandle)); 

#endif
/* 
 * Constants used for specifying the compressed format:
 * Together with the next set of constants passed in a single argument
 * to Zlib_StackChannel()!
 */
#define ZLIB_FORMAT_RAW  1
#define ZLIB_FORMAT_ZLIB 2
#define ZLIB_FORMAT_GZIP 4
#define ZLIB_FORMAT_AUTO 8
/*
 * Constants used for stacking/virtual channels
 * To be combined with the ZLIB_FORMAT_ flags 
 */
#define ZLIB_PASSTHROUGH 0 
#define ZLIB_DEFLATE    16
#define ZLIB_INFLATE    32

/* compression levels */
#define ZLIB_NO_COMPRESSION         0
#define ZLIB_BEST_SPEED             1
#define ZLIB_BEST_COMPRESSION       9
#define ZLIB_DEFAULT_COMPRESSION  (-1)

/* Flush parameters */
  
#define ZLIB_NO_FLUSH  0
#define ZLIB_FLUSH     2
#define ZLIB_FULLFLUSH 3
#define ZLIB_FINALIZE  4


#endif /* TCL_ZLIB_H */