/* zutil.h -- internal interface and configuration of the compression library
* Copyright (C) 1995-2026 Jean-loup Gailly, Mark Adler
* 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 ZUTIL_H
#define ZUTIL_H
#ifdef HAVE_HIDDEN
# define ZLIB_INTERNAL __attribute__((visibility (
"hidden")))
#else
# define ZLIB_INTERNAL
#endif
#include "zlib.h"
#if defined(STDC) && !
defined(Z_SOLO)
# if !(
defined(_WIN32_WCE) &&
defined(_MSC_VER))
# include <stddef.h>
# endif
# include <string.h>
# include <stdlib.h>
#endif
#ifndef local
# define local
static
#endif
/* since "static" is used to mean two completely different things in C, we
define "local" for the non-static meaning of "static", for readability
(compile with -Dlocal if your debugger can't find static symbols) */
extern const char deflate_copyright[];
extern const char inflate_copyright[];
extern const char inflate9_copyright[];
typedef unsigned char uch;
typedef uch FAR uchf;
typedef unsigned short ush;
typedef ush FAR ushf;
typedef unsigned long ulg;
#if !
defined(Z_U8) && !
defined(Z_SOLO) &&
defined(STDC)
# include <limits.h>
# if (ULONG_MAX ==
0xffffffffffffffff)
# define Z_U8
unsigned long
# elif (ULLONG_MAX ==
0xffffffffffffffff)
# define Z_U8
unsigned long long
# elif (ULONG_LONG_MAX ==
0xffffffffffffffff)
# define Z_U8
unsigned long long
# elif (UINT_MAX ==
0xffffffffffffffff)
# define Z_U8
unsigned
# endif
#endif
extern z_const
char *
const z_errmsg[
10];
/* indexed by 2-zlib_error */
/* (size given to avoid silly warnings with Visual C++) */
#define ERR_MSG(err) z_errmsg[(err) < -
6 || (err) >
2 ?
9 :
2 - (err)]
#define ERR_RETURN(strm,err) \
return (strm->msg = ERR_MSG(err), (err))
/* To be used only when the state is known to be valid */
/* common constants */
#if MAX_WBITS <
9 || MAX_WBITS >
15
# error MAX_WBITS must be in
9..
15
#endif
#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 */
#if defined(MSDOS) || (
defined(WINDOWS) && !
defined(WIN32))
# define OS_CODE
0x00
# ifndef Z_SOLO
# 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
#endif
#ifdef AMIGA
# define OS_CODE
1
#endif
#if defined(VAXC) ||
defined(VMS)
# define OS_CODE
2
# define F_OPEN(name, mode) \
fopen((name), (mode),
"mbc=60",
"ctx=stm",
"rfm=fix",
"mrs=512")
#endif
#ifdef __
370__
# if __TARGET_LIB__ <
0x20000000
# define OS_CODE
4
# elif __TARGET_LIB__ <
0x40000000
# define OS_CODE
11
# else
# define OS_CODE
8
# endif
#endif
#if defined(ATARI) ||
defined(atarist)
# define OS_CODE
5
#endif
#ifdef OS2
# define OS_CODE
6
# if defined(M_I86) && !
defined(Z_SOLO)
# include <malloc.h>
# endif
#endif
#if defined(MACOS)
# define OS_CODE
7
#endif
#if defined(__acorn) ||
defined(__riscos)
# define OS_CODE
13
#endif
#if defined(WIN32) && !
defined(__CYGWIN__)
# define OS_CODE
10
#endif
#ifdef _BEOS_
# define OS_CODE
16
#endif
#ifdef __TOS_OS400__
# define OS_CODE
18
#endif
#ifdef __APPLE__
# define OS_CODE
19
#endif
#if defined(__BORLANDC__) && !
defined(MSDOS)
#pragma warn -
8004
#pragma warn -
8008
#pragma warn -
8066
#endif
/* provide prototypes for these when building zlib without LFS */
#ifndef Z_LARGE64
ZEXTERN uLong ZEXPORT adler32_combine64(uLong, uLong, z_off64_t);
ZEXTERN uLong ZEXPORT crc32_combine64(uLong, uLong, z_off64_t);
ZEXTERN uLong ZEXPORT crc32_combine_gen64(z_off64_t);
#endif
/* common defaults */
#ifndef OS_CODE
# define OS_CODE
3 /* assume Unix */
#endif
#ifndef F_OPEN
# define F_OPEN(name, mode) fopen((name), (mode))
#endif
/* functions */
#if defined(pyr) ||
defined(Z_SOLO)
# 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
void ZLIB_INTERNAL zmemcpy(
void FAR *,
const void FAR *, z_size_t);
int ZLIB_INTERNAL zmemcmp(
const void FAR *,
const void FAR *, z_size_t);
void ZLIB_INTERNAL zmemzero(
void FAR *, z_size_t);
#endif
/* Diagnostic functions */
#ifdef ZLIB_DEBUG
# include <stdio.h>
extern int ZLIB_INTERNAL z_verbose;
extern void ZLIB_INTERNAL z_error(
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
#ifndef Z_SOLO
voidpf ZLIB_INTERNAL zcalloc(voidpf opaque,
unsigned items,
unsigned size);
void ZLIB_INTERNAL zcfree(voidpf opaque, voidpf ptr);
#endif
#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);}
/* Reverse the bytes in a 32-bit value */
#define ZSWAP32(q) ((((q) >>
24) &
0xff) + (((q) >>
8) &
0xff00) + \
(((q) &
0xff00) <<
8) + (((q) &
0xff) <<
24))
#ifdef Z_ONCE
/*
Create a local z_once() function depending on the availability of atomics.
*/
/* Check for the availability of atomics. */
#if defined(__STDC__) && __STDC_VERSION__ >=
201112L && \
!
defined(__STDC_NO_ATOMICS__)
#include <stdatomic.h>
typedef struct {
atomic_flag begun;
atomic_int done;
} z_once_t;
#define Z_ONCE_INIT {ATOMIC_FLAG_INIT,
0}
/*
Run the provided init() function exactly once, even if multiple threads
invoke once() at the same time. The state must be a once_t initialized with
Z_ONCE_INIT.
*/
local
void z_once(z_once_t *state,
void (*init)(
void)) {
if (!atomic_load(&state->done)) {
if (atomic_flag_test_and_set(&state->begun))
while (!atomic_load(&state->done))
;
else {
init();
atomic_store(&state->done,
1);
}
}
}
#else /* no atomics */
#warning zlib
not thread-safe
typedef struct z_once_s {
volatile int begun;
volatile int done;
} z_once_t;
#define Z_ONCE_INIT {
0,
0}
/* Test and set. Alas, not atomic, but tries to limit the period of
vulnerability. */
local
int test_and_set(
int volatile *flag) {
int was;
was = *flag;
*flag =
1;
return was;
}
/* Run the provided init() function once. This is not thread-safe. */
local
void z_once(z_once_t *state,
void (*init)(
void)) {
if (!state->done) {
if (test_and_set(&state->begun))
while (!state->done)
;
else {
init();
state->done =
1;
}
}
}
#endif /* ?atomics */
#endif /* Z_ONCE */
#endif /* ZUTIL_H */
