1/* gzguts.h -- zlib internal header definitions for gz* operations
2 * Copyright (C) 2004-2019 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#include <stdio.h>
21#include "zlib.h"
22#ifdef STDC
23# include <string.h>
24# include <stdlib.h>
25# include <limits.h>
26#endif
27
28#ifndef _POSIX_SOURCE
29# define _POSIX_SOURCE
30#endif
31#include <fcntl.h>
32
33#ifdef _WIN32
34# include <stddef.h>
35#endif
36
37#if defined(__TURBOC__) || defined(_MSC_VER) || defined(_WIN32)
38# include <io.h>
39#endif
40
41#if defined(_WIN32)
42# define WIDECHAR
43#endif
44
45#ifdef WINAPI_FAMILY
46# define open _open
47# define read _read
48# define write _write
49# define close _close
50#endif
51
52#ifdef NO_DEFLATE /* for compatibility with old definition */
53# define NO_GZCOMPRESS
54#endif
55
56#if defined(STDC99) || (defined(__TURBOC__) && __TURBOC__ >= 0x550)
57# ifndef HAVE_VSNPRINTF
58# define HAVE_VSNPRINTF
59# endif
60#endif
61
62#if defined(__CYGWIN__)
63# ifndef HAVE_VSNPRINTF
64# define HAVE_VSNPRINTF
65# endif
66#endif
67
68#if defined(MSDOS) && defined(__BORLANDC__) && (BORLANDC > 0x410)
69# ifndef HAVE_VSNPRINTF
70# define HAVE_VSNPRINTF
71# endif
72#endif
73
74#ifndef HAVE_VSNPRINTF
75# ifdef MSDOS
76/* vsnprintf may exist on some MS-DOS compilers (DJGPP?),
77 but for now we just assume it doesn't. */
78# define NO_vsnprintf
79# endif
80# ifdef __TURBOC__
81# define NO_vsnprintf
82# endif
83# ifdef WIN32
84/* In Win32, vsnprintf is available as the "non-ANSI" _vsnprintf. */
85# if !defined(vsnprintf) && !defined(NO_vsnprintf)
86# if !defined(_MSC_VER) || ( defined(_MSC_VER) && _MSC_VER < 1500 )
87# define vsnprintf _vsnprintf
88# endif
89# endif
90# endif
91# ifdef __SASC
92# define NO_vsnprintf
93# endif
94# ifdef VMS
95# define NO_vsnprintf
96# endif
97# ifdef __OS400__
98# define NO_vsnprintf
99# endif
100# ifdef __MVS__
101# define NO_vsnprintf
102# endif
103#endif
104
105/* unlike snprintf (which is required in C99), _snprintf does not guarantee
106 null termination of the result -- however this is only used in gzlib.c where
107 the result is assured to fit in the space provided */
108#if defined(_MSC_VER) && _MSC_VER < 1900
109# define snprintf _snprintf
110#endif
111
112#ifndef local
113# define local static
114#endif
115/* since "static" is used to mean two completely different things in C, we
116 define "local" for the non-static meaning of "static", for readability
117 (compile with -Dlocal if your debugger can't find static symbols) */
118
119/* gz* functions always use library allocation functions */
120#ifndef STDC
121 extern voidp malloc(uInt size);
122 extern void free(voidpf ptr);
123#endif
124
125/* get errno and strerror definition */
126#if defined UNDER_CE
127# include <windows.h>
128# define zstrerror() gz_strwinerror((DWORD)GetLastError())
129#else
130# ifndef NO_STRERROR
131# include <errno.h>
132# define zstrerror() strerror(errno)
133# else
134# define zstrerror() "stdio error (consult errno)"
135# endif
136#endif
137
138/* provide prototypes for these when building zlib without LFS */
139#if !defined(_LARGEFILE64_SOURCE) || _LFS64_LARGEFILE-0 == 0
140 ZEXTERN gzFile ZEXPORT gzopen64(const char *, const char *);
141 ZEXTERN z_off64_t ZEXPORT gzseek64(gzFile, z_off64_t, int);
142 ZEXTERN z_off64_t ZEXPORT gztell64(gzFile);
143 ZEXTERN z_off64_t ZEXPORT gzoffset64(gzFile);
144#endif
145
146/* default memLevel */
147#if MAX_MEM_LEVEL >= 8
148# define DEF_MEM_LEVEL 8
149#else
150# define DEF_MEM_LEVEL MAX_MEM_LEVEL
151#endif
152
153/* default i/o buffer size -- double this for output when reading (this and
154 twice this must be able to fit in an unsigned type) */
155#define GZBUFSIZE 8192
156
157/* gzip modes, also provide a little integrity check on the passed structure */
158#define GZ_NONE 0
159#define GZ_READ 7247
160#define GZ_WRITE 31153
161#define GZ_APPEND 1 /* mode set to GZ_WRITE after the file is opened */
162
163/* values for gz_state how */
164#define LOOK 0 /* look for a gzip header */
165#define COPY 1 /* copy input directly */
166#define GZIP 2 /* decompress a gzip stream */
167
168/* internal gzip file state data structure */
169typedef struct {
170 /* exposed contents for gzgetc() macro */
171 struct gzFile_s x; /* "x" for exposed */
172 /* x.have: number of bytes available at x.next */
173 /* x.next: next output data to deliver or write */
174 /* x.pos: current position in uncompressed data */
175 /* used for both reading and writing */
176 int mode; /* see gzip modes above */
177 int fd; /* file descriptor */
178 char *path; /* path or fd for error messages */
179 unsigned size; /* buffer size, zero if not allocated yet */
180 unsigned want; /* requested buffer size, default is GZBUFSIZE */
181 unsigned char *in; /* input buffer (double-sized when writing) */
182 unsigned char *out; /* output buffer (double-sized when reading) */
183 int direct; /* 0 if processing gzip, 1 if transparent */
184 /* just for reading */
185 int how; /* 0: get header, 1: copy, 2: decompress */
186 z_off64_t start; /* where the gzip data started, for rewinding */
187 int eof; /* true if end of input file reached */
188 int past; /* true if read requested past end */
189 /* just for writing */
190 int level; /* compression level */
191 int strategy; /* compression strategy */
192 int reset; /* true if a reset is pending after a Z_FINISH */
193 /* seek request */
194 z_off64_t skip; /* amount to skip (already rewound if backwards) */
195 int seek; /* true if seek request pending */
196 /* error information */
197 int err; /* error code */
198 char *msg; /* error message */
199 /* zlib inflate or deflate stream */
200 z_stream strm; /* stream structure in-place (not a pointer) */
201} gz_state;
202typedef gz_state FAR *gz_statep;
203
204/* shared functions */
205void ZLIB_INTERNAL gz_error(gz_statep, int, const char *);
206#if defined UNDER_CE
207char ZLIB_INTERNAL *gz_strwinerror(DWORD error);
208#endif
209
210/* GT_OFF(x), where x is an unsigned value, is true if x > maximum z_off64_t
211 value -- needed when comparing unsigned to z_off64_t, which is signed
212 (possible z_off64_t types off_t, off64_t, and long are all signed) */
213#ifdef INT_MAX
214# define GT_OFF(x) (sizeof(int) == sizeof(z_off64_t) && (x) > INT_MAX)
215#else
216unsigned ZLIB_INTERNAL gz_intmax(void);
217# define GT_OFF(x) (sizeof(int) == sizeof(z_off64_t) && (x) > gz_intmax())
218#endif
219