1/* gzguts.h -- zlib internal header definitions for gz* operations
2 * Copyright (C) 2004, 2005, 2010, 2011, 2012, 2013, 2016 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 <string.h>
25#  include <stdlib.h>
26#  include <limits.h>
27#endif
28
29#ifndef _POSIX_SOURCE
30#  define _POSIX_SOURCE
31#endif
32#include <fcntl.h>
33
34#ifdef _WIN32
35#  include <stddef.h>
36#endif
37
38#if defined(__TURBOC__) || defined(_MSC_VER) || defined(_WIN32)
39#  include <io.h>
40#endif
41
42#if defined(_WIN32) || defined(__CYGWIN__)
43#  define WIDECHAR
44#endif
45
46#ifdef WINAPI_FAMILY
47#  define open _open
48#  define read _read
49#  define write _write
50#  define close _close
51#endif
52
53#ifdef NO_DEFLATE       /* for compatibility with old definition */
54#  define NO_GZCOMPRESS
55#endif
56
57#if defined(STDC99) || (defined(__TURBOC__) && __TURBOC__ >= 0x550)
58#  ifndef HAVE_VSNPRINTF
59#    define HAVE_VSNPRINTF
60#  endif
61#endif
62
63#if defined(__CYGWIN__)
64#  ifndef HAVE_VSNPRINTF
65#    define HAVE_VSNPRINTF
66#  endif
67#endif
68
69#if defined(MSDOS) && defined(__BORLANDC__) && (BORLANDC > 0x410)
70#  ifndef HAVE_VSNPRINTF
71#    define HAVE_VSNPRINTF
72#  endif
73#endif
74
75#ifndef HAVE_VSNPRINTF
76#  ifdef MSDOS
77/* vsnprintf may exist on some MS-DOS compilers (DJGPP?),
78   but for now we just assume it doesn't. */
79#    define NO_vsnprintf
80#  endif
81#  ifdef __TURBOC__
82#    define NO_vsnprintf
83#  endif
84#  ifdef WIN32
85/* In Win32, vsnprintf is available as the "non-ANSI" _vsnprintf. */
86#    if !defined(vsnprintf) && !defined(NO_vsnprintf)
87#      if !defined(_MSC_VER) || ( defined(_MSC_VER) && _MSC_VER < 1500 )
88#         define vsnprintf _vsnprintf
89#      endif
90#    endif
91#  endif
92#  ifdef __SASC
93#    define NO_vsnprintf
94#  endif
95#  ifdef VMS
96#    define NO_vsnprintf
97#  endif
98#  ifdef __OS400__
99#    define NO_vsnprintf
100#  endif
101#  ifdef __MVS__
102#    define NO_vsnprintf
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 OF((uInt size));
123  extern void   free   OF((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 OF((const char *, const char *));
142    ZEXTERN z_off64_t ZEXPORT gzseek64 OF((gzFile, z_off64_t, int));
143    ZEXTERN z_off64_t ZEXPORT gztell64 OF((gzFile));
144    ZEXTERN z_off64_t ZEXPORT gzoffset64 OF((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        /* 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 OF((gz_statep, int, const char *));
206#if defined UNDER_CE
207char ZLIB_INTERNAL *gz_strwinerror OF((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 OF((void));
217#  define GT_OFF(x) (sizeof(int) == sizeof(z_off64_t) && (x) > gz_intmax())
218#endif
219