xref: /third_party/node/deps/zlib/zutil.h (revision 1cb0ef41) 
1/* zutil.h -- internal interface and configuration of the compression library
2 * Copyright (C) 1995-2022 Jean-loup Gailly, Mark Adler
3 * For conditions of distribution and use, see copyright notice in zlib.h
4 */
5
6/* WARNING: this file should *not* be used by applications. It is
7   part of the implementation of the compression library and is
8   subject to change. Applications should only use zlib.h.
9 */
10
11/* @(#) $Id$ */
12
13#ifndef ZUTIL_H
14#define ZUTIL_H
15
16#ifdef HAVE_HIDDEN
17#  define ZLIB_INTERNAL __attribute__((visibility ("hidden")))
18#else
19#  define ZLIB_INTERNAL
20#endif
21
22#include "zlib.h"
23
24#if defined(STDC) && !defined(Z_SOLO)
25#  if !(defined(_WIN32_WCE) && defined(_MSC_VER))
26#    include <stddef.h>
27#  endif
28#  include <string.h>
29#  include <stdlib.h>
30#endif
31#ifdef NO_ERRNO_H
32#   ifdef _WIN32_WCE
33      /* The Microsoft C Run-Time Library for Windows CE doesn't have
34       * errno.  We define it as a global variable to simplify porting.
35       * Its value is always 0 and should not be used.  We rename it to
36       * avoid conflict with other libraries that use the same workaround.
37       */
38#     define errno z_errno
39#   endif
40    extern int errno;
41#else
42#  ifndef _WIN32_WCE
43#    include <errno.h>
44#  endif
45#endif
46
47#ifndef local
48#  define local static
49#endif
50/* since "static" is used to mean two completely different things in C, we
51   define "local" for the non-static meaning of "static", for readability
52   (compile with -Dlocal if your debugger can't find static symbols) */
53
54typedef unsigned char  uch;
55typedef uch FAR uchf;
56typedef unsigned short ush;
57typedef ush FAR ushf;
58typedef unsigned long  ulg;
59
60#if !defined(Z_U8) && !defined(Z_SOLO) && defined(STDC)
61#  include <limits.h>
62#  if (ULONG_MAX == 0xffffffffffffffff)
63#    define Z_U8 unsigned long
64#  elif (ULLONG_MAX == 0xffffffffffffffff)
65#    define Z_U8 unsigned long long
66#  elif (UINT_MAX == 0xffffffffffffffff)
67#    define Z_U8 unsigned
68#  endif
69#endif
70
71extern z_const char * const z_errmsg[10]; /* indexed by 2-zlib_error */
72/* (size given to avoid silly warnings with Visual C++) */
73
74#define ERR_MSG(err) z_errmsg[Z_NEED_DICT-(err)]
75
76#define ERR_RETURN(strm,err) \
77  return (strm->msg = ERR_MSG(err), (err))
78/* To be used only when the state is known to be valid */
79
80        /* common constants */
81
82#ifndef DEF_WBITS
83#  define DEF_WBITS MAX_WBITS
84#endif
85/* default windowBits for decompression. MAX_WBITS is for compression only */
86
87#if MAX_MEM_LEVEL >= 8
88#  define DEF_MEM_LEVEL 8
89#else
90#  define DEF_MEM_LEVEL  MAX_MEM_LEVEL
91#endif
92/* default memLevel */
93
94#define STORED_BLOCK 0
95#define STATIC_TREES 1
96#define DYN_TREES    2
97/* The three kinds of block type */
98
99#define MIN_MATCH  3
100#define MAX_MATCH  258
101/* The minimum and maximum match lengths */
102
103#define PRESET_DICT 0x20 /* preset dictionary flag in zlib header */
104
105        /* target dependencies */
106
107#if defined(MSDOS) || (defined(WINDOWS) && !defined(WIN32))
108#  define OS_CODE  0x00
109#  ifndef Z_SOLO
110#    if defined(__TURBOC__) || defined(__BORLANDC__)
111#      if (__STDC__ == 1) && (defined(__LARGE__) || defined(__COMPACT__))
112         /* Allow compilation with ANSI keywords only enabled */
113         void _Cdecl farfree( void *block );
114         void *_Cdecl farmalloc( unsigned long nbytes );
115#      else
116#        include <alloc.h>
117#      endif
118#    else /* MSC or DJGPP */
119#      include <malloc.h>
120#    endif
121#  endif
122#endif
123
124#ifdef AMIGA
125#  define OS_CODE  1
126#endif
127
128#if defined(VAXC) || defined(VMS)
129#  define OS_CODE  2
130#  define F_OPEN(name, mode) \
131     fopen((name), (mode), "mbc=60", "ctx=stm", "rfm=fix", "mrs=512")
132#endif
133
134#ifdef __370__
135#  if __TARGET_LIB__ < 0x20000000
136#    define OS_CODE 4
137#  elif __TARGET_LIB__ < 0x40000000
138#    define OS_CODE 11
139#  else
140#    define OS_CODE 8
141#  endif
142#endif
143
144#if defined(ATARI) || defined(atarist)
145#  define OS_CODE  5
146#endif
147
148#ifdef OS2
149#  define OS_CODE  6
150#  if defined(M_I86) && !defined(Z_SOLO)
151#    include <malloc.h>
152#  endif
153#endif
154
155#if defined(MACOS) || defined(TARGET_OS_MAC)
156#  define OS_CODE  7
157#  ifndef Z_SOLO
158#    if defined(__MWERKS__) && __dest_os != __be_os && __dest_os != __win32_os
159#      include <unix.h> /* for fdopen */
160#    else
161#      ifndef fdopen
162#        define fdopen(fd,mode) NULL /* No fdopen() */
163#      endif
164#    endif
165#  endif
166#endif
167
168#ifdef __acorn
169#  define OS_CODE 13
170#endif
171
172#if defined(WIN32) && !defined(__CYGWIN__)
173#  define OS_CODE  10
174#endif
175
176#ifdef _BEOS_
177#  define OS_CODE  16
178#endif
179
180#ifdef __TOS_OS400__
181#  define OS_CODE 18
182#endif
183
184#ifdef __APPLE__
185#  define OS_CODE 19
186#endif
187
188#if defined(_BEOS_) || defined(RISCOS)
189#  define fdopen(fd,mode) NULL /* No fdopen() */
190#endif
191
192#if (defined(_MSC_VER) && (_MSC_VER > 600)) && !defined __INTERIX
193#  if defined(_WIN32_WCE)
194#    define fdopen(fd,mode) NULL /* No fdopen() */
195#  else
196#    define fdopen(fd,type)  _fdopen(fd,type)
197#  endif
198#endif
199
200#if defined(__BORLANDC__) && !defined(MSDOS)
201  #pragma warn -8004
202  #pragma warn -8008
203  #pragma warn -8066
204#endif
205
206/* provide prototypes for these when building zlib without LFS */
207#if !defined(_WIN32) && \
208    (!defined(_LARGEFILE64_SOURCE) || _LFS64_LARGEFILE-0 == 0)
209    ZEXTERN uLong ZEXPORT adler32_combine64(uLong, uLong, z_off_t);
210    ZEXTERN uLong ZEXPORT crc32_combine64(uLong, uLong, z_off_t);
211    ZEXTERN uLong ZEXPORT crc32_combine_gen64(z_off_t);
212#endif
213
214        /* common defaults */
215
216#ifndef OS_CODE
217#  define OS_CODE  3     /* assume Unix */
218#endif
219
220#ifndef F_OPEN
221#  define F_OPEN(name, mode) fopen((name), (mode))
222#endif
223
224         /* functions */
225
226#if defined(pyr) || defined(Z_SOLO)
227#  define NO_MEMCPY
228#endif
229#if defined(SMALL_MEDIUM) && !defined(_MSC_VER) && !defined(__SC__)
230 /* Use our own functions for small and medium model with MSC <= 5.0.
231  * You may have to use the same strategy for Borland C (untested).
232  * The __SC__ check is for Symantec.
233  */
234#  define NO_MEMCPY
235#endif
236#if defined(STDC) && !defined(HAVE_MEMCPY) && !defined(NO_MEMCPY)
237#  define HAVE_MEMCPY
238#endif
239#ifdef HAVE_MEMCPY
240#  ifdef SMALL_MEDIUM /* MSDOS small or medium model */
241#    define zmemcpy _fmemcpy
242#    define zmemcmp _fmemcmp
243#    define zmemzero(dest, len) _fmemset(dest, 0, len)
244#  else
245#    define zmemcpy memcpy
246#    define zmemcmp memcmp
247#    define zmemzero(dest, len) memset(dest, 0, len)
248#  endif
249#else
250   void ZLIB_INTERNAL zmemcpy(Bytef* dest, const Bytef* source, uInt len);
251   int ZLIB_INTERNAL zmemcmp(const Bytef* s1, const Bytef* s2, uInt len);
252   void ZLIB_INTERNAL zmemzero(Bytef* dest, uInt len);
253#endif
254
255/* Diagnostic functions */
256#ifdef ZLIB_DEBUG
257#  include <stdio.h>
258   extern int ZLIB_INTERNAL z_verbose;
259   extern void ZLIB_INTERNAL z_error(char *m);
260#  define Assert(cond,msg) {if(!(cond)) z_error(msg);}
261#  define Trace(x) {if (z_verbose>=0) fprintf x ;}
262#  define Tracev(x) {if (z_verbose>0) fprintf x ;}
263#  define Tracevv(x) {if (z_verbose>1) fprintf x ;}
264#  define Tracec(c,x) {if (z_verbose>0 && (c)) fprintf x ;}
265#  define Tracecv(c,x) {if (z_verbose>1 && (c)) fprintf x ;}
266#else
267#  define Assert(cond,msg)
268#  define Trace(x)
269#  define Tracev(x)
270#  define Tracevv(x)
271#  define Tracec(c,x)
272#  define Tracecv(c,x)
273#endif
274
275#ifndef Z_SOLO
276   voidpf ZLIB_INTERNAL zcalloc(voidpf opaque, unsigned items,
277                                unsigned size);
278   void ZLIB_INTERNAL zcfree(voidpf opaque, voidpf ptr);
279#endif
280
281#define ZALLOC(strm, items, size) \
282           (*((strm)->zalloc))((strm)->opaque, (items), (size))
283#define ZFREE(strm, addr)  (*((strm)->zfree))((strm)->opaque, (voidpf)(addr))
284#define TRY_FREE(s, p) {if (p) ZFREE(s, p);}
285
286/* Reverse the bytes in a 32-bit value */
287#define ZSWAP32(q) ((((q) >> 24) & 0xff) + (((q) >> 8) & 0xff00) + \
288                    (((q) & 0xff00) << 8) + (((q) & 0xff) << 24))
289
290#ifdef _MSC_VER
291#define zalign(x) __declspec(align(x))
292#else
293#define zalign(x) __attribute__((aligned((x))))
294#endif
295
296#endif /* ZUTIL_H */
297