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