1/* gzguts.h -- zlib internal header definitions for gz* operations
2 * Copyright (C) 2004, 2005, 2010, 2011, 2012, 2013 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#include <fcntl.h>
29
30#ifdef _WIN32
31#  include <stddef.h>
32#endif
33
34#if defined(__TURBOC__) || defined(_MSC_VER) || defined(_WIN32)
35#  include <io.h>
36#endif
37
38#ifdef WINAPI_FAMILY
39#  define open _open
40#  define read _read
41#  define write _write
42#  define close _close
43#endif
44
45#ifdef NO_DEFLATE       /* for compatibility with old definition */
46#  define NO_GZCOMPRESS
47#endif
48
49#if defined(STDC99) || (defined(__TURBOC__) && __TURBOC__ >= 0x550)
50#  ifndef HAVE_VSNPRINTF
51#    define HAVE_VSNPRINTF
52#  endif
53#endif
54
55#if defined(__CYGWIN__)
56#  ifndef HAVE_VSNPRINTF
57#    define HAVE_VSNPRINTF
58#  endif
59#endif
60
61#if defined(MSDOS) && defined(__BORLANDC__) && (BORLANDC > 0x410)
62#  ifndef HAVE_VSNPRINTF
63#    define HAVE_VSNPRINTF
64#  endif
65#endif
66
67#ifndef HAVE_VSNPRINTF
68#  ifdef MSDOS
69/* vsnprintf may exist on some MS-DOS compilers (DJGPP?),
70   but for now we just assume it doesn't. */
71#    define NO_vsnprintf
72#  endif
73#  ifdef __TURBOC__
74#    define NO_vsnprintf
75#  endif
76#  ifdef WIN32
77/* In Win32, vsnprintf is available as the "non-ANSI" _vsnprintf. */
78#    if !defined(vsnprintf) && !defined(NO_vsnprintf)
79#      if !defined(_MSC_VER) || ( defined(_MSC_VER) && _MSC_VER < 1500 )
80#         define vsnprintf _vsnprintf
81#      endif
82#    endif
83#  endif
84#  ifdef __SASC
85#    define NO_vsnprintf
86#  endif
87#  ifdef VMS
88#    define NO_vsnprintf
89#  endif
90#  ifdef __OS400__
91#    define NO_vsnprintf
92#  endif
93#  ifdef __MVS__
94#    define NO_vsnprintf
95#  endif
96#endif
97
98/* unlike snprintf (which is required in C99, yet still not supported by
99   Microsoft more than a decade later!), _snprintf does not guarantee null
100   termination of the result -- however this is only used in gzlib.c where
101   the result is assured to fit in the space provided */
102#ifdef _MSC_VER
103#  define snprintf _snprintf
104#endif
105
106#ifndef local
107#  define local static
108#endif
109/* compile with -Dlocal if your debugger can't find static symbols */
110
111/* gz* functions always use library allocation functions */
112#ifndef STDC
113  extern voidp  malloc OF((uInt size));
114  extern void   free   OF((voidpf ptr));
115#endif
116
117/* get errno and strerror definition */
118#if defined UNDER_CE
119#  include <windows.h>
120#  define zstrerror() gz_strwinerror((DWORD)GetLastError())
121#else
122#  ifndef NO_STRERROR
123#    include <errno.h>
124#    define zstrerror() strerror(errno)
125#  else
126#    define zstrerror() "stdio error (consult errno)"
127#  endif
128#endif
129
130/* provide prototypes for these when building zlib without LFS */
131#if !defined(_LARGEFILE64_SOURCE) || _LFS64_LARGEFILE-0 == 0
132    ZEXTERN gzFile ZEXPORT gzopen64 OF((const char *, const char *));
133    ZEXTERN z_off64_t ZEXPORT gzseek64 OF((gzFile, z_off64_t, int));
134    ZEXTERN z_off64_t ZEXPORT gztell64 OF((gzFile));
135    ZEXTERN z_off64_t ZEXPORT gzoffset64 OF((gzFile));
136#endif
137
138/* default memLevel */
139#if MAX_MEM_LEVEL >= 8
140#  define DEF_MEM_LEVEL 8
141#else
142#  define DEF_MEM_LEVEL  MAX_MEM_LEVEL
143#endif
144
145/* default i/o buffer size -- double this for output when reading (this and
146   twice this must be able to fit in an unsigned type) */
147#define GZBUFSIZE 8192
148
149/* gzip modes, also provide a little integrity check on the passed structure */
150#define GZ_NONE 0
151#define GZ_READ 7247
152#define GZ_WRITE 31153
153#define GZ_APPEND 1     /* mode set to GZ_WRITE after the file is opened */
154
155/* values for gz_state how */
156#define LOOK 0      /* look for a gzip header */
157#define COPY 1      /* copy input directly */
158#define GZIP 2      /* decompress a gzip stream */
159
160/* internal gzip file state data structure */
161typedef struct {
162        /* exposed contents for gzgetc() macro */
163    struct gzFile_s x;      /* "x" for exposed */
164                            /* x.have: number of bytes available at x.next */
165                            /* x.next: next output data to deliver or write */
166                            /* x.pos: current position in uncompressed data */
167        /* used for both reading and writing */
168    int mode;               /* see gzip modes above */
169    int fd;                 /* file descriptor */
170    char *path;             /* path or fd for error messages */
171    unsigned size;          /* buffer size, zero if not allocated yet */
172    unsigned want;          /* requested buffer size, default is GZBUFSIZE */
173    unsigned char *in;      /* input buffer */
174    unsigned char *out;     /* output buffer (double-sized when reading) */
175    int direct;             /* 0 if processing gzip, 1 if transparent */
176        /* just for reading */
177    int how;                /* 0: get header, 1: copy, 2: decompress */
178    z_off64_t start;        /* where the gzip data started, for rewinding */
179    int eof;                /* true if end of input file reached */
180    int past;               /* true if read requested past end */
181        /* just for writing */
182    int level;              /* compression level */
183    int strategy;           /* compression strategy */
184        /* seek request */
185    z_off64_t skip;         /* amount to skip (already rewound if backwards) */
186    int seek;               /* true if seek request pending */
187        /* error information */
188    int err;                /* error code */
189    char *msg;              /* error message */
190        /* zlib inflate or deflate stream */
191    z_stream strm;          /* stream structure in-place (not a pointer) */
192} gz_state;
193typedef gz_state FAR *gz_statep;
194
195/* shared functions */
196void ZLIB_INTERNAL gz_error OF((gz_statep, int, const char *));
197#if defined UNDER_CE
198char ZLIB_INTERNAL *gz_strwinerror OF((DWORD error));
199#endif
200
201/* GT_OFF(x), where x is an unsigned value, is true if x > maximum z_off64_t
202   value -- needed when comparing unsigned to z_off64_t, which is signed
203   (possible z_off64_t types off_t, off64_t, and long are all signed) */
204#ifdef INT_MAX
205#  define GT_OFF(x) (sizeof(int) == sizeof(z_off64_t) && (x) > INT_MAX)
206#else
207unsigned ZLIB_INTERNAL gz_intmax OF((void));
208#  define GT_OFF(x) (sizeof(int) == sizeof(z_off64_t) && (x) > gz_intmax())
209#endif
210