/* zutil.h -- internal interface and configuration of the compression library
 * Copyright (C) 1995-1998 Jean-loup Gailly.
 * For conditions of distribution and use, see copyright notice in zlib.h
 */

/* WARNING: this file should *not* be used by applications. It is
   part of the implementation of the compression library and is
   subject to change. Applications should only use zlib.h.
 */

/* @(#) $Id$ */

#ifndef _Z_UTIL_H
#define _Z_UTIL_H

#include "zlib.h"

#ifdef STDC
#  include <stddef.h>
#  include <string.h>
#  include <stdlib.h>
#endif
#ifdef NO_ERRNO_H
	extern int errno;
#else
#   include <errno.h>
#endif

#ifndef local
#  define local static
#endif
/* compile with -Dlocal if your debugger can't find static symbols */

typedef unsigned char  uch;
typedef uch FAR uchf;
typedef unsigned short ush;
typedef ush FAR ushf;
typedef unsigned long  ulg;

extern const char *z_errmsg[10]; /* indexed by 2-zlib_error */
/* (size given to avoid silly warnings with Visual C++) */

#define ERR_MSG(err) z_errmsg[Z_NEED_DICT-(err)]

#define ERR_RETURN(strm,err) \
  return (strm->msg = (char*)ERR_MSG(err), (err))
/* To be used only when the state is known to be valid */

		/* common constants */

#ifndef DEF_WBITS
#  define DEF_WBITS MAX_WBITS
#endif
/* default windowBits for decompression. MAX_WBITS is for compression only */

#if MAX_MEM_LEVEL >= 8
#  define DEF_MEM_LEVEL 8
#else
#  define DEF_MEM_LEVEL  MAX_MEM_LEVEL
#endif
/* default memLevel */

#define STORED_BLOCK 0
#define STATIC_TREES 1
#define DYN_TREES	2
/* The three kinds of block type */

#define MIN_MATCH  3
#define MAX_MATCH  258
/* The minimum and maximum match lengths */

#define PRESET_DICT 0x20 /* preset dictionary flag in zlib header */

		/* target dependencies */

#ifdef MSDOS
#  define OS_CODE  0x00
#	include <malloc.h>
#endif

#ifdef OS2
#  define OS_CODE  0x06
#endif

#ifdef WIN32 /* Window 95 & Windows NT */
#  define OS_CODE  0x0b
#endif

#ifdef AMIGA
#  define OS_CODE  0x01
#endif

#if defined(ATARI) || defined(atarist)
#  define OS_CODE  0x05
#endif

#if defined(MACOS) || defined(TARGET_OS_MAC)
#  define OS_CODE  0x07
#endif

#ifdef __50SERIES /* Prime/PRIMOS */
#  define OS_CODE  0x0F
#endif

#ifdef TOPS20
#  define OS_CODE  0x0a
#endif

		/* Common defaults */

#ifndef OS_CODE
#  define OS_CODE  0x03  /* assume Unix */
#endif

#ifndef F_OPEN
#  define F_OPEN(name, mode) fopen((name), (mode))
#endif

		 /* functions */

#ifdef HAVE_STRERROR
   extern char *strerror OF((int));
#  define zstrerror(errnum) strerror(errnum)
#else
#  define zstrerror(errnum) ""
#endif

#if defined(pyr)
#  define NO_MEMCPY
#endif
#if defined(SMALL_MEDIUM) && !defined(_MSC_VER) && !defined(__SC__)
 /* Use our own functions for small and medium model with MSC <= 5.0.
  * You may have to use the same strategy for Borland C (untested).
  * The __SC__ check is for Symantec.
  */
#  define NO_MEMCPY
#endif
#if defined(STDC) && !defined(HAVE_MEMCPY) && !defined(NO_MEMCPY)
#  define HAVE_MEMCPY
#endif
#ifdef HAVE_MEMCPY
#  ifdef SMALL_MEDIUM /* MSDOS small or medium model */
#	define zmemcpy _fmemcpy
#	define zmemcmp _fmemcmp
#	define zmemzero(dest, len) _fmemset(dest, 0, len)
#  else
#	define zmemcpy memcpy
#	define zmemcmp memcmp
#	define zmemzero(dest, len) memset(dest, 0, len)
#  endif
#else
   extern void zmemcpy  OF((Bytef* dest, const Bytef* source, uInt len));
   extern int  zmemcmp  OF((const Bytef* s1, const Bytef* s2, uInt len));
   extern void zmemzero OF((Bytef* dest, uInt len));
#endif

/* Diagnostic functions */
#  define Assert(cond,msg)
#  define Trace(x)
#  define Tracev(x)
#  define Tracevv(x)
#  define Tracec(c,x)
#  define Tracecv(c,x)

typedef uLong (ZEXPORT *check_func) OF((uLong check, const Bytef *buf,
					   uInt len));
voidpf z_calloc OF((voidpf opaque, unsigned items, unsigned size));
void   z_free  OF((voidpf opaque, voidpf ptr));

#define ZALLOC(strm, items, size) \
		   (*((strm)->zalloc))((strm)->opaque, (items), (size))
#define ZFREE(strm, addr)  (*((strm)->zfree))((strm)->opaque, (voidpf)(addr))
#define TRY_FREE(s, p) {if (p) ZFREE(s, p);}

#endif /* _Z_UTIL_H */
