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#  ifdef _FILE_OFFSET_BITS
11#    undef _FILE_OFFSET_BITS
12#  endif
13#endif
14
15#ifdef HAVE_HIDDEN
16#  define ZLIB_INTERNAL __attribute__((visibility ("hidden")))
17#else
18#  define ZLIB_INTERNAL
19#endif
20
21#include <stdio.h>
22#include "zlib.h"
23#ifdef STDC
24#  include <unistd.h>
25#  include <string.h>
26#  include <stdlib.h>
27#  include <limits.h>
28#endif
29
30#ifndef _POSIX_SOURCE
31#  define _POSIX_SOURCE
32#endif
33#include <fcntl.h>
34
35#ifdef _WIN32
36#  include <stddef.h>
37#endif
38
39#if defined(__TURBOC__) || defined(_MSC_VER) || defined(_WIN32)
40#  include <io.h>
41#endif
42
43#if defined(_WIN32)
44#  define WIDECHAR
45#endif
46
47#ifdef WINAPI_FAMILY
48#  define open _open
49#  define read _read
50#  define write _write
51#  define close _close
52#endif
53
54#ifdef NO_DEFLATE       /* for compatibility with old definition */
55#  define NO_GZCOMPRESS
56#endif
57
58#if defined(STDC99) || (defined(__TURBOC__) && __TURBOC__ >= 0x550)
59#  ifndef HAVE_VSNPRINTF
60#    define HAVE_VSNPRINTF
61#  endif
62#endif
63
64#if defined(__CYGWIN__)
65#  ifndef HAVE_VSNPRINTF
66#    define HAVE_VSNPRINTF
67#  endif
68#endif
69
70#if defined(MSDOS) && defined(__BORLANDC__) && (BORLANDC > 0x410)
71#  ifndef HAVE_VSNPRINTF
72#    define HAVE_VSNPRINTF
73#  endif
74#endif
75
76#ifndef HAVE_VSNPRINTF
77#  ifdef MSDOS
78/* vsnprintf may exist on some MS-DOS compilers (DJGPP?),
79   but for now we just assume it doesn't. */
80#    define NO_vsnprintf
81#  endif
82#  ifdef __TURBOC__
83#    define NO_vsnprintf
84#  endif
85#  ifdef WIN32
86/* In Win32, vsnprintf is available as the "non-ANSI" _vsnprintf. */
87#    if !defined(vsnprintf) && !defined(NO_vsnprintf)
88#      if !defined(_MSC_VER) || ( defined(_MSC_VER) && _MSC_VER < 1500 )
89#         define vsnprintf _vsnprintf
90#      endif
91#    endif
92#  endif
93#  ifdef __SASC
94#    define NO_vsnprintf
95#  endif
96#  ifdef VMS
97#    define NO_vsnprintf
98#  endif
99#  ifdef __OS400__
100#    define NO_vsnprintf
101#  endif
102#  ifdef __MVS__
103#    define NO_vsnprintf
104#  endif
105#endif
106
107/* unlike snprintf (which is required in C99), _snprintf does not guarantee
108   null termination of the result -- however this is only used in gzlib.c where
109   the result is assured to fit in the space provided */
110#if defined(_MSC_VER) && _MSC_VER < 1900
111#  define snprintf _snprintf
112#endif
113
114#ifndef local
115#  define local static
116#endif
117/* since "static" is used to mean two completely different things in C, we
118   define "local" for the non-static meaning of "static", for readability
119   (compile with -Dlocal if your debugger can't find static symbols) */
120
121/* gz* functions always use library allocation functions */
122#ifndef STDC
123  extern voidp  malloc OF((uInt size));
124  extern void   free   OF((voidpf ptr));
125#endif
126
127/* get errno and strerror definition */
128#if defined UNDER_CE
129#  include <windows.h>
130#  define zstrerror() gz_strwinerror((DWORD)GetLastError())
131#else
132#  ifndef NO_STRERROR
133#    include <errno.h>
134#    define zstrerror() strerror(errno)
135#  else
136#    define zstrerror() "stdio error (consult errno)"
137#  endif
138#endif
139
140/* provide prototypes for these when building zlib without LFS */
141#if !defined(_LARGEFILE64_SOURCE) || _LFS64_LARGEFILE-0 == 0
142    ZEXTERN gzFile ZEXPORT gzopen64 OF((const char *, const char *));
143    ZEXTERN z_off64_t ZEXPORT gzseek64 OF((gzFile, z_off64_t, int));
144    ZEXTERN z_off64_t ZEXPORT gztell64 OF((gzFile));
145    ZEXTERN z_off64_t ZEXPORT gzoffset64 OF((gzFile));
146#endif
147
148/* default memLevel */
149#if MAX_MEM_LEVEL >= 8
150#  define DEF_MEM_LEVEL 8
151#else
152#  define DEF_MEM_LEVEL  MAX_MEM_LEVEL
153#endif
154
155/* default i/o buffer size -- double this for output when reading (this and
156   twice this must be able to fit in an unsigned type) */
157#define GZBUFSIZE 8192
158
159/* gzip modes, also provide a little integrity check on the passed structure */
160#define GZ_NONE 0
161#define GZ_READ 7247
162#define GZ_WRITE 31153
163#define GZ_APPEND 1     /* mode set to GZ_WRITE after the file is opened */
164
165/* values for gz_state how */
166#define LOOK 0      /* look for a gzip header */
167#define COPY 1      /* copy input directly */
168#define GZIP 2      /* decompress a gzip stream */
169
170/* internal gzip file state data structure */
171typedef struct {
172        /* exposed contents for gzgetc() macro */
173    struct gzFile_s x;      /* "x" for exposed */
174                            /* x.have: number of bytes available at x.next */
175                            /* x.next: next output data to deliver or write */
176                            /* x.pos: current position in uncompressed data */
177        /* used for both reading and writing */
178    int mode;               /* see gzip modes above */
179    int fd;                 /* file descriptor */
180    char *path;             /* path or fd for error messages */
181    unsigned size;          /* buffer size, zero if not allocated yet */
182    unsigned want;          /* requested buffer size, default is GZBUFSIZE */
183    unsigned char *in;      /* input buffer (double-sized when writing) */
184    unsigned char *out;     /* output buffer (double-sized when reading) */
185    int direct;             /* 0 if processing gzip, 1 if transparent */
186        /* just for reading */
187    int how;                /* 0: get header, 1: copy, 2: decompress */
188    z_off64_t start;        /* where the gzip data started, for rewinding */
189    int eof;                /* true if end of input file reached */
190    int past;               /* true if read requested past end */
191        /* just for writing */
192    int level;              /* compression level */
193    int strategy;           /* compression strategy */
194    int reset;              /* true if a reset is pending after a Z_FINISH */
195        /* seek request */
196    z_off64_t skip;         /* amount to skip (already rewound if backwards) */
197    int seek;               /* true if seek request pending */
198        /* error information */
199    int err;                /* error code */
200    char *msg;              /* error message */
201        /* zlib inflate or deflate stream */
202    z_stream strm;          /* stream structure in-place (not a pointer) */
203} gz_state;
204typedef gz_state FAR *gz_statep;
205
206/* shared functions */
207void ZLIB_INTERNAL gz_error OF((gz_statep, int, const char *));
208#if defined UNDER_CE
209char ZLIB_INTERNAL *gz_strwinerror OF((DWORD error));
210#endif
211
212/* GT_OFF(x), where x is an unsigned value, is true if x > maximum z_off64_t
213   value -- needed when comparing unsigned to z_off64_t, which is signed
214   (possible z_off64_t types off_t, off64_t, and long are all signed) */
215#ifdef INT_MAX
216#  define GT_OFF(x) (sizeof(int) == sizeof(z_off64_t) && (x) > INT_MAX)
217#else
218unsigned ZLIB_INTERNAL gz_intmax OF((void));
219#  define GT_OFF(x) (sizeof(int) == sizeof(z_off64_t) && (x) > gz_intmax())
220#endif
221