Annotation of embedaddon/sudo/zlib/gzguts.h, revision 1.1.1.1
1.1 misho 1: /* gzguts.h -- zlib internal header definitions for gz* operations
2: * Copyright (C) 2004, 2005, 2010 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: #if ((__GNUC__-0) * 10 + __GNUC_MINOR__-0 >= 33) && !defined(NO_VIZ)
16: # define ZLIB_INTERNAL __attribute__((visibility ("hidden")))
17: #else
18: # define ZLIB_INTERNAL
19: #endif
20:
21: #include "zlib.h"
22: #include <stdio.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 NO_DEFLATE /* for compatibility with old definition */
31: # define NO_GZCOMPRESS
32: #endif
33:
34: #ifdef _MSC_VER
35: # include <io.h>
36: # define vsnprintf _vsnprintf
37: #endif
38:
39: #ifndef local
40: # define local static
41: #endif
42: /* compile with -Dlocal if your debugger can't find static symbols */
43:
44: /* gz* functions always use library allocation functions */
45: #ifndef STDC
46: extern voidp malloc OF((uInt size));
47: extern void free OF((voidpf ptr));
48: #endif
49:
50: /* get errno and strerror definition */
51: #if defined UNDER_CE
52: # include <windows.h>
53: # define zstrerror() gz_strwinerror((DWORD)GetLastError())
54: #else
55: # ifdef STDC
56: # include <errno.h>
57: # define zstrerror() strerror(errno)
58: # else
59: # define zstrerror() "stdio error (consult errno)"
60: # endif
61: #endif
62:
63: /* provide prototypes for these when building zlib without LFS */
64: #if !defined(_LARGEFILE64_SOURCE) || _LFS64_LARGEFILE-0 == 0
65: ZEXTERN gzFile ZEXPORT gzopen64 OF((const char *, const char *));
66: ZEXTERN z_off64_t ZEXPORT gzseek64 OF((gzFile, z_off64_t, int));
67: ZEXTERN z_off64_t ZEXPORT gztell64 OF((gzFile));
68: ZEXTERN z_off64_t ZEXPORT gzoffset64 OF((gzFile));
69: #endif
70:
71: /* default i/o buffer size -- double this for output when reading */
72: #define GZBUFSIZE 8192
73:
74: /* gzip modes, also provide a little integrity check on the passed structure */
75: #define GZ_NONE 0
76: #define GZ_READ 7247
77: #define GZ_WRITE 31153
78: #define GZ_APPEND 1 /* mode set to GZ_WRITE after the file is opened */
79:
80: /* values for gz_state how */
81: #define LOOK 0 /* look for a gzip header */
82: #define COPY 1 /* copy input directly */
83: #define GZIP 2 /* decompress a gzip stream */
84:
85: /* internal gzip file state data structure */
86: typedef struct {
87: /* used for both reading and writing */
88: int mode; /* see gzip modes above */
89: int fd; /* file descriptor */
90: char *path; /* path or fd for error messages */
91: z_off64_t pos; /* current position in uncompressed data */
92: unsigned size; /* buffer size, zero if not allocated yet */
93: unsigned want; /* requested buffer size, default is GZBUFSIZE */
94: unsigned char *in; /* input buffer */
95: unsigned char *out; /* output buffer (double-sized when reading) */
96: unsigned char *next; /* next output data to deliver or write */
97: /* just for reading */
98: unsigned have; /* amount of output data unused at next */
99: int eof; /* true if end of input file reached */
100: z_off64_t start; /* where the gzip data started, for rewinding */
101: z_off64_t raw; /* where the raw data started, for seeking */
102: int how; /* 0: get header, 1: copy, 2: decompress */
103: int direct; /* true if last read direct, false if gzip */
104: /* just for writing */
105: int level; /* compression level */
106: int strategy; /* compression strategy */
107: /* seek request */
108: z_off64_t skip; /* amount to skip (already rewound if backwards) */
109: int seek; /* true if seek request pending */
110: /* error information */
111: int err; /* error code */
112: char *msg; /* error message */
113: /* zlib inflate or deflate stream */
114: z_stream strm; /* stream structure in-place (not a pointer) */
115: } gz_state;
116: typedef gz_state FAR *gz_statep;
117:
118: /* shared functions */
119: void ZLIB_INTERNAL gz_error OF((gz_statep, int, const char *));
120: #if defined UNDER_CE
121: char ZLIB_INTERNAL *gz_strwinerror OF((DWORD error));
122: #endif
123:
124: /* GT_OFF(x), where x is an unsigned value, is true if x > maximum z_off64_t
125: value -- needed when comparing unsigned to z_off64_t, which is signed
126: (possible z_off64_t types off_t, off64_t, and long are all signed) */
127: #ifdef INT_MAX
128: # define GT_OFF(x) (sizeof(int) == sizeof(z_off64_t) && (x) > INT_MAX)
129: #else
130: unsigned ZLIB_INTERNAL gz_intmax OF((void));
131: # define GT_OFF(x) (sizeof(int) == sizeof(z_off64_t) && (x) > gz_intmax())
132: #endif
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