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#else
33#  include <unistd.h>
34#endif
35
36#if defined(__TURBOC__) || defined(_MSC_VER) || defined(_WIN32)
37#  include <io.h>
38#endif
39
40#ifdef WINAPI_FAMILY
41#  define open _open
42#  define read _read
43#  define write _write
44#  define close _close
45#endif
46
47#ifdef NO_DEFLATE       /* for compatibility with old definition */
48#  define NO_GZCOMPRESS
49#endif
50
51#if defined(STDC99) || (defined(__TURBOC__) && __TURBOC__ >= 0x550)
52#  ifndef HAVE_VSNPRINTF
53#    define HAVE_VSNPRINTF
54#  endif
55#endif
56
57#if defined(__CYGWIN__)
58#  ifndef HAVE_VSNPRINTF
59#    define HAVE_VSNPRINTF
60#  endif
61#endif
62
63#if defined(MSDOS) && defined(__BORLANDC__) && (BORLANDC > 0x410)
64#  ifndef HAVE_VSNPRINTF
65#    define HAVE_VSNPRINTF
66#  endif
67#endif
68
69#ifndef HAVE_VSNPRINTF
70#  ifdef MSDOS
71/* vsnprintf may exist on some MS-DOS compilers (DJGPP?),
72   but for now we just assume it doesn't. */
73#    define NO_vsnprintf
74#  endif
75#  ifdef __TURBOC__
76#    define NO_vsnprintf
77#  endif
78#  ifdef WIN32
79/* In Win32, vsnprintf is available as the "non-ANSI" _vsnprintf. */
80#    if !defined(vsnprintf) && !defined(NO_vsnprintf)
81#      if !defined(_MSC_VER) || ( defined(_MSC_VER) && _MSC_VER < 1500 )
82#         define vsnprintf _vsnprintf
83#      endif
84#    endif
85#  endif
86#  ifdef __SASC
87#    define NO_vsnprintf
88#  endif
89#  ifdef VMS
90#    define NO_vsnprintf
91#  endif
92#  ifdef __OS400__
93#    define NO_vsnprintf
94#  endif
95#  ifdef __MVS__
96#    define NO_vsnprintf
97#  endif
98#endif
99
100/* unlike snprintf (which is required in C99, yet still not supported by
101   Microsoft more than a decade later!), _snprintf does not guarantee null
102   termination of the result -- however this is only used in gzlib.c where
103   the result is assured to fit in the space provided */
104#ifdef _MSC_VER
105#  define snprintf _snprintf
106#endif
107
108#ifndef local
109#  define local static
110#endif
111/* compile with -Dlocal if your debugger can't find static symbols */
112
113/* gz* functions always use library allocation functions */
114#ifndef STDC
115  extern voidp  malloc OF((uInt size));
116  extern void   free   OF((voidpf ptr));
117#endif
118
119#if defined(_FX_MANAGED_CODE_) && defined(__cplusplus)
120extern "C" {
121#endif
122
123extern void* FXMEM_DefaultAlloc(size_t, int);
124extern void FXMEM_DefaultFree(void*, int);
125
126#if defined(_FX_MANAGED_CODE_) && defined(__cplusplus)
127}
128#endif
129
130#define malloc(size) FXMEM_DefaultAlloc(size, 0)
131#define free(ptr) FXMEM_DefaultFree(ptr, 0)
132
133/* get errno and strerror definition */
134#if defined UNDER_CE
135#  include <windows.h>
136#  define zstrerror() gz_strwinerror((DWORD)GetLastError())
137#else
138#  ifndef NO_STRERROR
139#    include <errno.h>
140#    define zstrerror() strerror(errno)
141#  else
142#    define zstrerror() "stdio error (consult errno)"
143#  endif
144#endif
145
146/* provide prototypes for these when building zlib without LFS */
147#if !defined(_LARGEFILE64_SOURCE) || _LFS64_LARGEFILE-0 == 0
148    ZEXTERN gzFile ZEXPORT gzopen64 OF((const char *, const char *));
149    ZEXTERN z_off64_t ZEXPORT gzseek64 OF((gzFile, z_off64_t, int));
150    ZEXTERN z_off64_t ZEXPORT gztell64 OF((gzFile));
151    ZEXTERN z_off64_t ZEXPORT gzoffset64 OF((gzFile));
152#endif
153
154/* default memLevel */
155#if MAX_MEM_LEVEL >= 8
156#  define DEF_MEM_LEVEL 8
157#else
158#  define DEF_MEM_LEVEL  MAX_MEM_LEVEL
159#endif
160
161/* default i/o buffer size -- double this for output when reading (this and
162   twice this must be able to fit in an unsigned type) */
163#define GZBUFSIZE 8192
164
165/* gzip modes, also provide a little integrity check on the passed structure */
166#define GZ_NONE 0
167#define GZ_READ 7247
168#define GZ_WRITE 31153
169#define GZ_APPEND 1     /* mode set to GZ_WRITE after the file is opened */
170
171/* values for gz_state how */
172#define LOOK 0      /* look for a gzip header */
173#define COPY 1      /* copy input directly */
174#define GZIP 2      /* decompress a gzip stream */
175
176/* internal gzip file state data structure */
177typedef struct {
178        /* exposed contents for gzgetc() macro */
179    struct gzFile_s x;      /* "x" for exposed */
180                            /* x.have: number of bytes available at x.next */
181                            /* x.next: next output data to deliver or write */
182                            /* x.pos: current position in uncompressed data */
183        /* used for both reading and writing */
184    int mode;               /* see gzip modes above */
185    int fd;                 /* file descriptor */
186    char *path;             /* path or fd for error messages */
187    unsigned size;          /* buffer size, zero if not allocated yet */
188    unsigned want;          /* requested buffer size, default is GZBUFSIZE */
189    unsigned char *in;      /* input buffer */
190    unsigned char *out;     /* output buffer (double-sized when reading) */
191    int direct;             /* 0 if processing gzip, 1 if transparent */
192        /* just for reading */
193    int how;                /* 0: get header, 1: copy, 2: decompress */
194    z_off64_t start;        /* where the gzip data started, for rewinding */
195    int eof;                /* true if end of input file reached */
196    int past;               /* true if read requested past end */
197        /* just for writing */
198    int level;              /* compression level */
199    int strategy;           /* compression strategy */
200        /* seek request */
201    z_off64_t skip;         /* amount to skip (already rewound if backwards) */
202    int seek;               /* true if seek request pending */
203        /* error information */
204    int err;                /* error code */
205    char *msg;              /* error message */
206        /* zlib inflate or deflate stream */
207    z_stream strm;          /* stream structure in-place (not a pointer) */
208} gz_state;
209typedef gz_state FAR *gz_statep;
210
211/* shared functions */
212void ZLIB_INTERNAL gz_error OF((gz_statep, int, const char *));
213#if defined UNDER_CE
214char ZLIB_INTERNAL *gz_strwinerror OF((DWORD error));
215#endif
216
217/* GT_OFF(x), where x is an unsigned value, is true if x > maximum z_off64_t
218   value -- needed when comparing unsigned to z_off64_t, which is signed
219   (possible z_off64_t types off_t, off64_t, and long are all signed) */
220#ifdef INT_MAX
221#  define GT_OFF(x) (sizeof(int) == sizeof(z_off64_t) && (x) > INT_MAX)
222#else
223unsigned ZLIB_INTERNAL gz_intmax OF((void));
224#  define GT_OFF(x) (sizeof(int) == sizeof(z_off64_t) && (x) > gz_intmax())
225#endif
226