/* ioapi.h -- IO base function header for compress/uncompress .zip
   files using zlib + zip or unzip API

   Version 1.01, May 8th, 2004

   Copyright (C) 1998-2004 Gilles Vollant
*/

#ifndef IOAPI_H
#define IOAPI_H


#define ZLIB_FILEFUNC_SEEK_CUR (1)
#define ZLIB_FILEFUNC_SEEK_END (2)
#define ZLIB_FILEFUNC_SEEK_SET (0)

#define ZLIB_FILEFUNC_MODE_READ      (1)
#define ZLIB_FILEFUNC_MODE_WRITE     (2)
#define ZLIB_FILEFUNC_MODE_READWRITEFILTER (3)

#define ZLIB_FILEFUNC_MODE_EXISTING (4)
#define ZLIB_FILEFUNC_MODE_CREATE   (8)


#ifndef ZCALLBACK

#if (defined(WIN32) || defined (WINDOWS) ||                                   \
   defined (_WINDOWS)) && defined(CALLBACK) &&                                \
   defined (USEWINDOWS_CALLBACK)
#define ZCALLBACK CALLBACK
#else
#define ZCALLBACK
#endif
#endif

#ifdef __cplusplus
extern "C" {
#endif

typedef
	voidpf (ZCALLBACK * open_file_func)
	OF((voidpf opaque, char const * filename, int mode));
typedef
	uLong  (ZCALLBACK * read_file_func)
	OF((voidpf opaque, voidpf stream, void * buf, uLong size));
typedef
	uLong  (ZCALLBACK * write_file_func)
	OF((voidpf opaque, voidpf stream, void const * buf, uLong size));
typedef
	long   (ZCALLBACK * tell_file_func)
	OF((voidpf opaque, voidpf stream));
typedef
	long   (ZCALLBACK * seek_file_func)
	OF((voidpf opaque, voidpf stream, uLong offset, int origin));
typedef
	int    (ZCALLBACK * close_file_func)
	OF((voidpf opaque, voidpf stream));
typedef
	int    (ZCALLBACK * testerror_file_func)
	OF((voidpf opaque, voidpf stream));

typedef struct zlib_filefunc_def_s
{
	open_file_func      zopen_file;
	read_file_func      zread_file;
	write_file_func     zwrite_file;
	tell_file_func      ztell_file;
	seek_file_func      zseek_file;
	close_file_func     zclose_file;
	testerror_file_func zerror_file;
	voidpf              opaque;
} zlib_filefunc_def;



void fill_fopen_filefunc OF((zlib_filefunc_def * pzlib_filefunc_def));

#define ZREAD(filefunc, filestream, buf, size) \
   ((*((filefunc).zread_file))((filefunc).opaque, filestream, buf, size))
#define ZWRITE(filefunc, filestream, buf, size) \
   ((*((filefunc).zwrite_file))((filefunc).opaque, filestream, buf, size))
#define ZTELL(filefunc, filestream)                                           \
   ((*((filefunc).ztell_file)) ((filefunc).opaque, filestream))
#define ZSEEK(filefunc, filestream, pos, mode) \
   ((*((filefunc).zseek_file))((filefunc).opaque, filestream, pos, mode))
#define ZCLOSE(filefunc, filestream) \
   ((*((filefunc).zclose_file))((filefunc).opaque, filestream))
#define ZERROR(filefunc, filestream) \
   ((*((filefunc).zerror_file))((filefunc).opaque, filestream))


#ifdef __cplusplus
}
#endif

#endif
