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#else
42#  include <unistd.h>
43#endif
44
45#if defined(__TURBOC__) || defined(_MSC_VER) || defined(_WIN32)
46#  include <io.h>
47#endif
48
49#if defined(_WIN32)
50#  define WIDECHAR
51#endif
52
53#ifdef WINAPI_FAMILY
54#  define open _open
55#  define read _read
56#  define write _write
57#  define close _close
58#endif
59
60#ifdef NO_DEFLATE       /* for compatibility with old definition */
61#  define NO_GZCOMPRESS
62#endif
63
64#if defined(STDC99) || (defined(__TURBOC__) && __TURBOC__ >= 0x550)
65#  ifndef HAVE_VSNPRINTF
66#    define HAVE_VSNPRINTF
67#  endif
68#endif
69
70#if defined(__CYGWIN__)
71#  ifndef HAVE_VSNPRINTF
72#    define HAVE_VSNPRINTF
73#  endif
74#endif
75
76#if defined(MSDOS) && defined(__BORLANDC__) && (BORLANDC > 0x410)
77#  ifndef HAVE_VSNPRINTF
78#    define HAVE_VSNPRINTF
79#  endif
80#endif
81
82#ifndef HAVE_VSNPRINTF
83#  ifdef MSDOS
84/* vsnprintf may exist on some MS-DOS compilers (DJGPP?),
85   but for now we just assume it doesn't. */
86#    define NO_vsnprintf
87#  endif
88#  ifdef __TURBOC__
89#    define NO_vsnprintf
90#  endif
91#  ifdef WIN32
92/* In Win32, vsnprintf is available as the "non-ANSI" _vsnprintf. */
93#    if !defined(vsnprintf) && !defined(NO_vsnprintf)
94#      if !defined(_MSC_VER) || ( defined(_MSC_VER) && _MSC_VER < 1500 )
95#         define vsnprintf _vsnprintf
96#      endif
97#    endif
98#  endif
99#  ifdef __SASC
100#    define NO_vsnprintf
101#  endif
102#  ifdef VMS
103#    define NO_vsnprintf
104#  endif
105#  ifdef __OS400__
106#    define NO_vsnprintf
107#  endif
108#  ifdef __MVS__
109#    define NO_vsnprintf
110#  endif
111#endif
112
113/* unlike snprintf (which is required in C99), _snprintf does not guarantee
114   null termination of the result -- however this is only used in gzlib.c where
115   the result is assured to fit in the space provided */
116#if defined(_MSC_VER) && _MSC_VER < 1900
117#  define snprintf _snprintf
118#endif
119
120#ifndef local
121#  define local static
122#endif
123/* since "static" is used to mean two completely different things in C, we
124   define "local" for the non-static meaning of "static", for readability
125   (compile with -Dlocal if your debugger can't find static symbols) */
126
127/* gz* functions always use library allocation functions */
128#ifndef STDC
129  extern voidp  malloc OF((uInt size));
130  extern void   free   OF((voidpf ptr));
131#endif
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 (double-sized when writing) */
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;
209
210typedef union {
211    gz_state FAR *state;
212    gzFile file;
213} gz_statep;
214
215/* shared functions */
216void ZLIB_INTERNAL gz_error OF((gz_statep, int, const char *));
217#if defined UNDER_CE
218char ZLIB_INTERNAL *gz_strwinerror OF((DWORD error));
219#endif
220
221/* GT_OFF(x), where x is an unsigned value, is true if x > maximum z_off64_t
222   value -- needed when comparing unsigned to z_off64_t, which is signed
223   (possible z_off64_t types off_t, off64_t, and long are all signed) */
224#ifdef INT_MAX
225#  define GT_OFF(x) (sizeof(int) == sizeof(z_off64_t) && (x) > INT_MAX)
226#else
227unsigned ZLIB_INTERNAL gz_intmax OF((void));
228#  define GT_OFF(x) (sizeof(int) == sizeof(z_off64_t) && (x) > gz_intmax())
229#endif
230