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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 | |
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5 | /* gzguts.h -- zlib internal header definitions for gz* operations |
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6 | * Copyright (C) 2004, 2005, 2010, 2011, 2012, 2013, 2016 Mark Adler |
7 | * For conditions of distribution and use, see https://www.zlib.net/zlib_license.html |
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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> |
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26 | #include "zstd_zlibwrapper.h" |
27 | #include "gzcompatibility.h" |
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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> |
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41 | #else |
42 | # include <unistd.h> |
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43 | #endif |
44 | |
45 | #if defined(__TURBOC__) || defined(_MSC_VER) || defined(_WIN32) |
46 | # include <io.h> |
47 | #endif |
48 | |
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49 | #if defined(_WIN32) |
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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 |
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129 | extern voidp malloc _Z_OF((uInt size)); |
130 | extern void free _Z_OF((voidpf ptr)); |
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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 |
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148 | ZEXTERN gzFile ZEXPORT gzopen64 _Z_OF((const char *, const char *)); |
149 | ZEXTERN z_off64_t ZEXPORT gzseek64 _Z_OF((gzFile, z_off64_t, int)); |
150 | ZEXTERN z_off64_t ZEXPORT gztell64 _Z_OF((gzFile)); |
151 | ZEXTERN z_off64_t ZEXPORT gzoffset64 _Z_OF((gzFile)); |
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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 */ |
177 | typedef 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; |
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209 | |
210 | typedef union { |
211 | gz_state FAR *state; |
212 | gzFile file; |
213 | } gz_statep; |
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214 | |
215 | /* shared functions */ |
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216 | void ZLIB_INTERNAL gz_error _Z_OF((gz_statep, int, const char *)); |
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217 | #if defined UNDER_CE |
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218 | char ZLIB_INTERNAL *gz_strwinerror _Z_OF((DWORD error)); |
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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 |
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227 | unsigned ZLIB_INTERNAL gz_intmax _Z_OF((void)); |
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228 | # define GT_OFF(x) (sizeof(int) == sizeof(z_off64_t) && (x) > gz_intmax()) |
229 | #endif |