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 */
161 typedef 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;
193 typedef gz_state FAR *gz_statep;
194 
195 /* shared functions */
196 void ZLIB_INTERNAL gz_error OF((gz_statep, int, const char *));
197 #if defined UNDER_CE
198 char 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
207 unsigned ZLIB_INTERNAL gz_intmax OF((void));
208 #  define GT_OFF(x) (sizeof(int) == sizeof(z_off64_t) && (x) > gz_intmax())
209 #endif
210