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zutil.h
1 /* zutil.h -- internal interface and configuration of the compression library
2  * Copyright (C) 1995-2005 Jean-loup Gailly.
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 #define ZLIB_INTERNAL
17 #include "zlib.h"
18 
19 #ifdef STDC
20 # ifndef _WIN32_WCE
21 # include <stddef.h>
22 # endif
23 # include <string.h>
24 # include <stdlib.h>
25 #endif
26 #ifdef NO_ERRNO_H
27 # ifdef _WIN32_WCE
28  /* The Microsoft C Run-Time Library for Windows CE doesn't have
29  * errno. We define it as a global variable to simplify porting.
30  * Its value is always 0 and should not be used. We rename it to
31  * avoid conflict with other libraries that use the same workaround.
32  */
33 # define errno z_errno
34 # endif
35  extern int errno;
36 #else
37 # ifndef _WIN32_WCE
38 # include <errno.h>
39 # endif
40 #endif
41 
42 #ifndef local
43 # define local static
44 #endif
45 /* compile with -Dlocal if your debugger can't find static symbols */
46 
47 typedef unsigned char uch;
48 typedef uch FAR uchf;
49 typedef unsigned short ush;
50 typedef ush FAR ushf;
51 typedef unsigned long ulg;
52 
53 extern const char * const z_errmsg[10]; /* indexed by 2-zlib_error */
54 /* (size given to avoid silly warnings with Visual C++) */
55 
56 #define ERR_MSG(err) z_errmsg[Z_NEED_DICT-(err)]
57 
58 #define ERR_RETURN(strm,err) \
59  return (strm->msg = (char*)ERR_MSG(err), (err))
60 /* To be used only when the state is known to be valid */
61 
62  /* common constants */
63 
64 #ifndef DEF_WBITS
65 # define DEF_WBITS MAX_WBITS
66 #endif
67 /* default windowBits for decompression. MAX_WBITS is for compression only */
68 
69 #if MAX_MEM_LEVEL >= 8
70 # define DEF_MEM_LEVEL 8
71 #else
72 # define DEF_MEM_LEVEL MAX_MEM_LEVEL
73 #endif
74 /* default memLevel */
75 
76 #define STORED_BLOCK 0
77 #define STATIC_TREES 1
78 #define DYN_TREES 2
79 /* The three kinds of block type */
80 
81 #define MIN_MATCH 3
82 #define MAX_MATCH 258
83 /* The minimum and maximum match lengths */
84 
85 #define PRESET_DICT 0x20 /* preset dictionary flag in zlib header */
86 
87  /* target dependencies */
88 
89 #if defined(MSDOS) || (defined(WINDOWS) && !defined(WIN32))
90 # define OS_CODE 0x00
91 # if defined(__TURBOC__) || defined(__BORLANDC__)
92 # if(__STDC__ == 1) && (defined(__LARGE__) || defined(__COMPACT__))
93  /* Allow compilation with ANSI keywords only enabled */
94  void _Cdecl farfree( void *block );
95  void *_Cdecl farmalloc( unsigned long nbytes );
96 # else
97 # include <alloc.h>
98 # endif
99 # else /* MSC or DJGPP */
100 # include <malloc.h>
101 # endif
102 #endif
103 
104 #ifdef AMIGA
105 # define OS_CODE 0x01
106 #endif
107 
108 #if defined(VAXC) || defined(VMS)
109 # define OS_CODE 0x02
110 # define F_OPEN(name, mode) \
111  fopen((name), (mode), "mbc=60", "ctx=stm", "rfm=fix", "mrs=512")
112 #endif
113 
114 #if defined(ATARI) || defined(atarist)
115 # define OS_CODE 0x05
116 #endif
117 
118 #ifdef OS2
119 # define OS_CODE 0x06
120 # ifdef M_I86
121  #include <malloc.h>
122 # endif
123 #endif
124 
125 #if defined(MACOS) || defined(TARGET_OS_MAC)
126 # define OS_CODE 0x07
127 # if defined(__MWERKS__) && __dest_os != __be_os && __dest_os != __win32_os
128 # include <unix.h> /* for fdopen */
129 # else
130 # ifndef fdopen
131 # define fdopen(fd,mode) NULL /* No fdopen() */
132 # endif
133 # endif
134 #endif
135 
136 #ifdef TOPS20
137 # define OS_CODE 0x0a
138 #endif
139 
140 #ifdef WIN32
141 # ifndef __CYGWIN__ /* Cygwin is Unix, not Win32 */
142 # define OS_CODE 0x0b
143 # endif
144 #endif
145 
146 #ifdef __50SERIES /* Prime/PRIMOS */
147 # define OS_CODE 0x0f
148 #endif
149 
150 #if defined(_BEOS_) || defined(RISCOS)
151 # define fdopen(fd,mode) NULL /* No fdopen() */
152 #endif
153 
154 #if (defined(_MSC_VER) && (_MSC_VER > 600))
155 # if defined(_WIN32_WCE)
156 # define fdopen(fd,mode) NULL /* No fdopen() */
157 # ifndef _PTRDIFF_T_DEFINED
158  typedef int ptrdiff_t;
159 # define _PTRDIFF_T_DEFINED
160 # endif
161 # else
162 # define fdopen(fd,type) _fdopen(fd,type)
163 # endif
164 #endif
165 
166  /* common defaults */
167 
168 #ifndef OS_CODE
169 # define OS_CODE 0x03 /* assume Unix */
170 #endif
171 
172 #ifndef F_OPEN
173 # define F_OPEN(name, mode) fopen((name), (mode))
174 #endif
175 
176  /* functions */
177 
178 #if defined(STDC99) || (defined(__TURBOC__) && __TURBOC__ >= 0x550)
179 # ifndef HAVE_VSNPRINTF
180 # define HAVE_VSNPRINTF
181 # endif
182 #endif
183 #if defined(__CYGWIN__)
184 # ifndef HAVE_VSNPRINTF
185 # define HAVE_VSNPRINTF
186 # endif
187 #endif
188 #ifndef HAVE_VSNPRINTF
189 # ifdef MSDOS
190  /* vsnprintf may exist on some MS-DOS compilers (DJGPP?),
191  but for now we just assume it doesn't. */
192 # define NO_vsnprintf
193 # endif
194 # ifdef __TURBOC__
195 # define NO_vsnprintf
196 # endif
197 # if defined(WIN32) && (!defined(_MSC_VER) || _MSC_VER < 1500)
198  /* In Win32, vsnprintf is available as the "non-ANSI" _vsnprintf. */
199 # if !defined(vsnprintf) && !defined(NO_vsnprintf)
200 # define vsnprintf _vsnprintf
201 # endif
202 # endif
203 # ifdef __SASC
204 # define NO_vsnprintf
205 # endif
206 #endif
207 #ifdef VMS
208 # define NO_vsnprintf
209 #endif
210 
211 #if defined(pyr)
212 # define NO_MEMCPY
213 #endif
214 #if defined(SMALL_MEDIUM) && !defined(_MSC_VER) && !defined(__SC__)
215  /* Use our own functions for small and medium model with MSC <= 5.0.
216  * You may have to use the same strategy for Borland C (untested).
217  * The __SC__ check is for Symantec.
218  */
219 # define NO_MEMCPY
220 #endif
221 #if defined(STDC) && !defined(HAVE_MEMCPY) && !defined(NO_MEMCPY)
222 # define HAVE_MEMCPY
223 #endif
224 #ifdef HAVE_MEMCPY
225 # ifdef SMALL_MEDIUM /* MSDOS small or medium model */
226 # define zmemcpy _fmemcpy
227 # define zmemcmp _fmemcmp
228 # define zmemzero(dest, len) _fmemset(dest, 0, len)
229 # else
230 # define zmemcpy memcpy
231 # define zmemcmp memcmp
232 # define zmemzero(dest, len) memset(dest, 0, len)
233 # endif
234 #else
235  extern void zmemcpy OF((Bytef* dest, const Bytef* source, uInt len));
236  extern int zmemcmp OF((const Bytef* s1, const Bytef* s2, uInt len));
237  extern void zmemzero OF((Bytef* dest, uInt len));
238 #endif
239 
240 /* Diagnostic functions */
241 #ifdef DEBUG
242 # include <stdio.h>
243  extern int z_verbose;
244  extern void z_error OF((char *m));
245 # define Assert(cond,msg) {if(!(cond)) z_error(msg);}
246 # define Trace(x) {if (z_verbose>=0) fprintf x ;}
247 # define Tracev(x) {if (z_verbose>0) fprintf x ;}
248 # define Tracevv(x) {if (z_verbose>1) fprintf x ;}
249 # define Tracec(c,x) {if (z_verbose>0 && (c)) fprintf x ;}
250 # define Tracecv(c,x) {if (z_verbose>1 && (c)) fprintf x ;}
251 #else
252 # define Assert(cond,msg)
253 # define Trace(x)
254 # define Tracev(x)
255 # define Tracevv(x)
256 # define Tracec(c,x)
257 # define Tracecv(c,x)
258 #endif
259 
260 
261 voidpf zcalloc OF((voidpf opaque, unsigned items, unsigned size));
262 void zcfree OF((voidpf opaque, voidpf ptr));
263 
264 #define ZALLOC(strm, items, size) \
265  (*((strm)->zalloc))((strm)->opaque, (items), (size))
266 #define ZFREE(strm, addr) (*((strm)->zfree))((strm)->opaque, (voidpf)(addr))
267 #define TRY_FREE(s, p) {if (p) ZFREE(s, p);}
268 
269 #endif /* ZUTIL_H */