1/* gzguts.h contains minimal changes required to be compiled with zlibWrapper:
2 * - #include "zlib.h" was changed to #include "zstd_zlibwrapper.h"
3 * - gz_statep was converted to union to work with -Wstrict-aliasing=1      */
4
5/* gzguts.h -- zlib internal header definitions for gz* operations
6 * Copyright (C) 2004, 2005, 2010, 2011, 2012, 2013, 2016 Mark Adler
7 * For conditions of distribution and use, see http://www.zlib.net/zlib_license.html
8 */
9
10#ifdef _LARGEFILE64_SOURCE
11#  ifndef _LARGEFILE_SOURCE
12#    define _LARGEFILE_SOURCE 1
13#  endif
14#  ifdef _FILE_OFFSET_BITS
15#    undef _FILE_OFFSET_BITS
16#  endif
17#endif
18
19#ifdef HAVE_HIDDEN
20#  define ZLIB_INTERNAL __attribute__((visibility ("hidden")))
21#else
22#  define ZLIB_INTERNAL
23#endif
24
25#include <stdio.h>
26#include "zstd_zlibwrapper.h"
27#include "gzcompatibility.h"
28#ifdef STDC
29#  include <string.h>
30#  include <stdlib.h>
31#  include <limits.h>
32#endif
33
34#ifndef _POSIX_SOURCE
35#  define _POSIX_SOURCE
36#endif
37#include <fcntl.h>
38
39#ifdef _WIN32
40#  include <stddef.h>
41#endif
42
43#if defined(__TURBOC__) || defined(_MSC_VER) || defined(_WIN32)
44#  include <io.h>
45#endif
46
47#if defined(_WIN32) || defined(__CYGWIN__)
48#  define WIDECHAR
49#endif
50
51#ifdef WINAPI_FAMILY
52#  define open _open
53#  define read _read
54#  define write _write
55#  define close _close
56#endif
57
58#ifdef NO_DEFLATE       /* for compatibility with old definition */
59#  define NO_GZCOMPRESS
60#endif
61
62#if defined(STDC99) || (defined(__TURBOC__) && __TURBOC__ >= 0x550)
63#  ifndef HAVE_VSNPRINTF
64#    define HAVE_VSNPRINTF
65#  endif
66#endif
67
68#if defined(__CYGWIN__)
69#  ifndef HAVE_VSNPRINTF
70#    define HAVE_VSNPRINTF
71#  endif
72#endif
73
74#if defined(MSDOS) && defined(__BORLANDC__) && (BORLANDC > 0x410)
75#  ifndef HAVE_VSNPRINTF
76#    define HAVE_VSNPRINTF
77#  endif
78#endif
79
80#ifndef HAVE_VSNPRINTF
81#  ifdef MSDOS
82/* vsnprintf may exist on some MS-DOS compilers (DJGPP?),
83   but for now we just assume it doesn't. */
84#    define NO_vsnprintf
85#  endif
86#  ifdef __TURBOC__
87#    define NO_vsnprintf
88#  endif
89#  ifdef WIN32
90/* In Win32, vsnprintf is available as the "non-ANSI" _vsnprintf. */
91#    if !defined(vsnprintf) && !defined(NO_vsnprintf)
92#      if !defined(_MSC_VER) || ( defined(_MSC_VER) && _MSC_VER < 1500 )
93#         define vsnprintf _vsnprintf
94#      endif
95#    endif
96#  endif
97#  ifdef __SASC
98#    define NO_vsnprintf
99#  endif
100#  ifdef VMS
101#    define NO_vsnprintf
102#  endif
103#  ifdef __OS400__
104#    define NO_vsnprintf
105#  endif
106#  ifdef __MVS__
107#    define NO_vsnprintf
108#  endif
109#endif
110
111/* unlike snprintf (which is required in C99), _snprintf does not guarantee
112   null termination of the result -- however this is only used in gzlib.c where
113   the result is assured to fit in the space provided */
114#if defined(_MSC_VER) && _MSC_VER < 1900
115#  define snprintf _snprintf
116#endif
117
118#ifndef local
119#  define local static
120#endif
121/* since "static" is used to mean two completely different things in C, we
122   define "local" for the non-static meaning of "static", for readability
123   (compile with -Dlocal if your debugger can't find static symbols) */
124
125/* gz* functions always use library allocation functions */
126#ifndef STDC
127  extern voidp  malloc OF((uInt size));
128  extern void   free   OF((voidpf ptr));
129#endif
130
131/* get errno and strerror definition */
132#if defined UNDER_CE
133#  include <windows.h>
134#  define zstrerror() gz_strwinerror((DWORD)GetLastError())
135#else
136#  ifndef NO_STRERROR
137#    include <errno.h>
138#    define zstrerror() strerror(errno)
139#  else
140#    define zstrerror() "stdio error (consult errno)"
141#  endif
142#endif
143
144/* provide prototypes for these when building zlib without LFS */
145#if !defined(_LARGEFILE64_SOURCE) || _LFS64_LARGEFILE-0 == 0
146    ZEXTERN gzFile ZEXPORT gzopen64 OF((const char *, const char *));
147    ZEXTERN z_off64_t ZEXPORT gzseek64 OF((gzFile, z_off64_t, int));
148    ZEXTERN z_off64_t ZEXPORT gztell64 OF((gzFile));
149    ZEXTERN z_off64_t ZEXPORT gzoffset64 OF((gzFile));
150#endif
151
152/* default memLevel */
153#if MAX_MEM_LEVEL >= 8
154#  define DEF_MEM_LEVEL 8
155#else
156#  define DEF_MEM_LEVEL  MAX_MEM_LEVEL
157#endif
158
159/* default i/o buffer size -- double this for output when reading (this and
160   twice this must be able to fit in an unsigned type) */
161#define GZBUFSIZE 8192
162
163/* gzip modes, also provide a little integrity check on the passed structure */
164#define GZ_NONE 0
165#define GZ_READ 7247
166#define GZ_WRITE 31153
167#define GZ_APPEND 1     /* mode set to GZ_WRITE after the file is opened */
168
169/* values for gz_state how */
170#define LOOK 0      /* look for a gzip header */
171#define COPY 1      /* copy input directly */
172#define GZIP 2      /* decompress a gzip stream */
173
174/* internal gzip file state data structure */
175typedef struct {
176        /* exposed contents for gzgetc() macro */
177    struct gzFile_s x;      /* "x" for exposed */
178                            /* x.have: number of bytes available at x.next */
179                            /* x.next: next output data to deliver or write */
180                            /* x.pos: current position in uncompressed data */
181        /* used for both reading and writing */
182    int mode;               /* see gzip modes above */
183    int fd;                 /* file descriptor */
184    char *path;             /* path or fd for error messages */
185    unsigned size;          /* buffer size, zero if not allocated yet */
186    unsigned want;          /* requested buffer size, default is GZBUFSIZE */
187    unsigned char *in;      /* input buffer (double-sized when writing) */
188    unsigned char *out;     /* output buffer (double-sized when reading) */
189    int direct;             /* 0 if processing gzip, 1 if transparent */
190        /* just for reading */
191    int how;                /* 0: get header, 1: copy, 2: decompress */
192    z_off64_t start;        /* where the gzip data started, for rewinding */
193    int eof;                /* true if end of input file reached */
194    int past;               /* true if read requested past end */
195        /* just for writing */
196    int level;              /* compression level */
197    int strategy;           /* compression strategy */
198        /* seek request */
199    z_off64_t skip;         /* amount to skip (already rewound if backwards) */
200    int seek;               /* true if seek request pending */
201        /* error information */
202    int err;                /* error code */
203    char *msg;              /* error message */
204        /* zlib inflate or deflate stream */
205    z_stream strm;          /* stream structure in-place (not a pointer) */
206} gz_state;
207
208typedef union {
209    gz_state FAR *state;
210    gzFile file;
211} gz_statep;
212
213/* shared functions */
214void ZLIB_INTERNAL gz_error OF((gz_statep, int, const char *));
215#if defined UNDER_CE
216char ZLIB_INTERNAL *gz_strwinerror OF((DWORD error));
217#endif
218
219/* GT_OFF(x), where x is an unsigned value, is true if x > maximum z_off64_t
220   value -- needed when comparing unsigned to z_off64_t, which is signed
221   (possible z_off64_t types off_t, off64_t, and long are all signed) */
222#ifdef INT_MAX
223#  define GT_OFF(x) (sizeof(int) == sizeof(z_off64_t) && (x) > INT_MAX)
224#else
225unsigned ZLIB_INTERNAL gz_intmax OF((void));
226#  define GT_OFF(x) (sizeof(int) == sizeof(z_off64_t) && (x) > gz_intmax())
227#endif
228