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