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

   Version 1.01e, February 12th, 2005

   Copyright (C) 1998-2005 Gilles Vollant
*/

#ifndef _ZLIBIOAPI_H
#define _ZLIBIOAPI_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, const char *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, const void *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