1/* gzguts.h -- zlib internal header definitions for gz* operations
2 * Copyright (C) 2004-2024 Mark Adler
3 * For conditions of distribution and use, see copyright notice in zlib.h
4 */
5
6#ifdef _LARGEFILE64_SOURCE
7#  ifndef _LARGEFILE_SOURCE
8#    define _LARGEFILE_SOURCE 1
9#  endif
10#  undef _FILE_OFFSET_BITS
11#  undef _TIME_BITS
12#endif
13
14#ifdef HAVE_HIDDEN
15#  define ZLIB_INTERNAL __attribute__((visibility ("hidden")))
16#else
17#  define ZLIB_INTERNAL
18#endif
19
20#if defined(_WIN32)
21#  ifndef WIN32_LEAN_AND_MEAN
22#    define WIN32_LEAN_AND_MEAN
23#  endif
24#  ifndef _CRT_SECURE_NO_WARNINGS
25#    define _CRT_SECURE_NO_WARNINGS
26#  endif
27#  ifndef _CRT_NONSTDC_NO_DEPRECATE
28#    define _CRT_NONSTDC_NO_DEPRECATE
29#  endif
30#endif
31
32#include <stdio.h>
33#include "zlib.h"
34#ifdef STDC
35#  include <string.h>
36#  include <stdlib.h>
37#  include <limits.h>
38#endif
39
40#ifndef _POSIX_C_SOURCE
41#  define _POSIX_C_SOURCE 200112L
42#endif
43#include <fcntl.h>
44
45#ifdef _WIN32
46#  include <stddef.h>
47#endif
48
49#if defined(__TURBOC__) || defined(_MSC_VER) || defined(_WIN32)
50#  include <io.h>
51#  include <sys/stat.h>
52#endif
53
54#if defined(_WIN32) && !defined(WIDECHAR)
55#  define WIDECHAR
56#endif
57
58#ifdef NO_DEFLATE       /* for compatibility with old definition */
59#  define NO_GZCOMPRESS
60#endif
61
62#if defined(STDC99) || (defined(__TURBOC__) && __TURBOC__ >= 0x550)
63#  ifndef HAVE_VSNPRINTF
64#    define HAVE_VSNPRINTF
65#  endif
66#endif
67
68#if defined(__CYGWIN__)
69#  ifndef HAVE_VSNPRINTF
70#    define HAVE_VSNPRINTF
71#  endif
72#endif
73
74#if defined(MSDOS) && defined(__BORLANDC__) && (BORLANDC > 0x410)
75#  ifndef HAVE_VSNPRINTF
76#    define HAVE_VSNPRINTF
77#  endif
78#endif
79
80#ifndef HAVE_VSNPRINTF
81#  if !defined(NO_vsnprintf) && \
82      (defined(MSDOS) || defined(__TURBOC__) || defined(__SASC) || \
83       defined(VMS) || defined(__OS400) || defined(__MVS__))
84/* vsnprintf may exist on some MS-DOS compilers (DJGPP?),
85   but for now we just assume it doesn't. */
86#    define NO_vsnprintf
87#  endif
88#  ifdef WIN32
89/* In Win32, vsnprintf is available as the "non-ANSI" _vsnprintf. */
90#    if !defined(_MSC_VER) || ( defined(_MSC_VER) && _MSC_VER < 1500 )
91#      ifndef vsnprintf
92#        define vsnprintf _vsnprintf
93#      endif
94#    endif
95#  elif !defined(__STDC_VERSION__) || __STDC_VERSION__-0 < 199901L
96/* Otherwise if C89/90, assume no C99 snprintf() or vsnprintf() */
97#    ifndef NO_snprintf
98#      define NO_snprintf
99#    endif
100#    ifndef NO_vsnprintf
101#      define NO_vsnprintf
102#    endif
103#  endif
104#endif
105
106/* unlike snprintf (which is required in C99), _snprintf does not guarantee
107   null termination of the result -- however this is only used in gzlib.c where
108   the result is assured to fit in the space provided */
109#if defined(_MSC_VER) && _MSC_VER < 1900
110#  define snprintf _snprintf
111#endif
112
113#ifndef local
114#  define local static
115#endif
116/* since "static" is used to mean two completely different things in C, we
117   define "local" for the non-static meaning of "static", for readability
118   (compile with -Dlocal if your debugger can't find static symbols) */
119
120/* gz* functions always use library allocation functions */
121#ifndef STDC
122  extern voidp  malloc(uInt size);
123  extern void   free(voidpf ptr);
124#endif
125
126/* get errno and strerror definition */
127#if defined UNDER_CE
128#  include <windows.h>
129#  define zstrerror() gz_strwinerror((DWORD)GetLastError())
130#else
131#  ifndef NO_STRERROR
132#    include <errno.h>
133#    define zstrerror() strerror(errno)
134#  else
135#    define zstrerror() "stdio error (consult errno)"
136#  endif
137#endif
138
139/* provide prototypes for these when building zlib without LFS */
140#if !defined(_LARGEFILE64_SOURCE) || _LFS64_LARGEFILE-0 == 0
141    ZEXTERN gzFile ZEXPORT gzopen64(const char *, const char *);
142    ZEXTERN z_off64_t ZEXPORT gzseek64(gzFile, z_off64_t, int);
143    ZEXTERN z_off64_t ZEXPORT gztell64(gzFile);
144    ZEXTERN z_off64_t ZEXPORT gzoffset64(gzFile);
145#endif
146
147/* default memLevel */
148#if MAX_MEM_LEVEL >= 8
149#  define DEF_MEM_LEVEL 8
150#else
151#  define DEF_MEM_LEVEL  MAX_MEM_LEVEL
152#endif
153
154/* default i/o buffer size -- double this for output when reading (this and
155   twice this must be able to fit in an unsigned type) */
156#define GZBUFSIZE 8192
157
158/* gzip modes, also provide a little integrity check on the passed structure */
159#define GZ_NONE 0
160#define GZ_READ 7247
161#define GZ_WRITE 31153
162#define GZ_APPEND 1     /* mode set to GZ_WRITE after the file is opened */
163
164/* values for gz_state how */
165#define LOOK 0      /* look for a gzip header */
166#define COPY 1      /* copy input directly */
167#define GZIP 2      /* decompress a gzip stream */
168
169/* internal gzip file state data structure */
170typedef struct {
171        /* exposed contents for gzgetc() macro */
172    struct gzFile_s x;      /* "x" for exposed */
173                            /* x.have: number of bytes available at x.next */
174                            /* x.next: next output data to deliver or write */
175                            /* x.pos: current position in uncompressed data */
176        /* used for both reading and writing */
177    int mode;               /* see gzip modes above */
178    int fd;                 /* file descriptor */
179    char *path;             /* path or fd for error messages */
180    unsigned size;          /* buffer size, zero if not allocated yet */
181    unsigned want;          /* requested buffer size, default is GZBUFSIZE */
182    unsigned char *in;      /* input buffer (double-sized when writing) */
183    unsigned char *out;     /* output buffer (double-sized when reading) */
184    int direct;             /* 0 if processing gzip, 1 if transparent */
185        /* just for reading */
186    int how;                /* 0: get header, 1: copy, 2: decompress */
187    z_off64_t start;        /* where the gzip data started, for rewinding */
188    int eof;                /* true if end of input file reached */
189    int past;               /* true if read requested past end */
190        /* just for writing */
191    int level;              /* compression level */
192    int strategy;           /* compression strategy */
193    int reset;              /* true if a reset is pending after a Z_FINISH */
194        /* seek request */
195    z_off64_t skip;         /* amount to skip (already rewound if backwards) */
196    int seek;               /* true if seek request pending */
197        /* error information */
198    int err;                /* error code */
199    char *msg;              /* error message */
200        /* zlib inflate or deflate stream */
201    z_stream strm;          /* stream structure in-place (not a pointer) */
202} gz_state;
203typedef gz_state FAR *gz_statep;
204
205/* shared functions */
206void ZLIB_INTERNAL gz_error(gz_statep, int, const char *);
207#if defined UNDER_CE
208char ZLIB_INTERNAL *gz_strwinerror(DWORD error);
209#endif
210
211/* GT_OFF(x), where x is an unsigned value, is true if x > maximum z_off64_t
212   value -- needed when comparing unsigned to z_off64_t, which is signed
213   (possible z_off64_t types off_t, off64_t, and long are all signed) */
214unsigned ZLIB_INTERNAL gz_intmax(void);
215#define GT_OFF(x) (sizeof(int) == sizeof(z_off64_t) && (x) > gz_intmax())
216