/* 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

#  if defined(__TURBOC__) || defined(__BORLANDC__)

#    if(__STDC__ == 1) && (defined(__LARGE__) || defined(__COMPACT__))

       /* Allow compilation with ANSI keywords only enabled */

       void _Cdecl farfree( void *block );

       void *_Cdecl farmalloc( unsigned long nbytes );

#    else

#     include <alloc.h>

#    endif

#  else /* MSC or DJGPP */

#    include <malloc.h>

#  endif

#endif

#ifdef OS2

#  define OS_CODE  0x06

#endif

#ifdef WIN32 /* Window 95 & Windows NT */

#  define OS_CODE  0x0b

#endif

#if defined(VAXC) || defined(VMS)

#  define OS_CODE  0x02

#  define F_OPEN(name, mode) \

     fopen((name), (mode), "mbc=60", "ctx=stm", "rfm=fix", "mrs=512")

#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

#  if defined(__MWERKS__) && __dest_os != __be_os && __dest_os != __win32_os

#    include <unix.h> /* for fdopen */

#  else

#    ifndef fdopen

#      define fdopen(fd,mode) NULL /* No fdopen() */

#    endif

#  endif

#endif

#ifdef __50SERIES /* Prime/PRIMOS */

#  define OS_CODE  0x0F

#endif

#ifdef TOPS20

#  define OS_CODE  0x0a

#endif

#if defined(_BEOS_) || defined(RISCOS)

#  define fdopen(fd,mode) NULL /* No fdopen() */

#endif

#if (defined(_MSC_VER) && (_MSC_VER > 600))

#  define fdopen(fd,type)  _fdopen(fd,type)

#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 */

#ifdef DEBUG

#  include <stdio.h>

   extern int z_verbose;

   extern void z_error    OF((char *m));

#  define Assert(cond,msg) {if(!(cond)) z_error(msg);}

#  define Trace(x) {if (z_verbose>=0) fprintf x ;}

#  define Tracev(x) {if (z_verbose>0) fprintf x ;}

#  define Tracevv(x) {if (z_verbose>1) fprintf x ;}

#  define Tracec(c,x) {if (z_verbose>0 && (c)) fprintf x ;}

#  define Tracecv(c,x) {if (z_verbose>1 && (c)) fprintf x ;}

#else

#  define Assert(cond,msg)

#  define Trace(x)

#  define Tracev(x)

#  define Tracevv(x)

#  define Tracec(c,x)

#  define Tracecv(c,x)

#endif

typedef uLong (ZEXPORT *check_func) OF((uLong check, const Bytef *buf,

				       uInt len));

voidpf zcalloc OF((voidpf opaque, unsigned items, unsigned size));

void   zcfree  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 */