summaryrefslogtreecommitdiffstats
path: root/cpukit/zlib/gzguts.h
blob: 0e7ed4330a5028fdfe32b7208f33f323876761b1 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
/* gzguts.h -- zlib internal header definitions for gz* operations
 * Copyright (C) 2004, 2005, 2010 Mark Adler
 * For conditions of distribution and use, see copyright notice in zlib.h
 */

#ifdef _LARGEFILE64_SOURCE
#  ifndef _LARGEFILE_SOURCE
#    define _LARGEFILE_SOURCE
#  endif
#  ifdef _FILE_OFFSET_BITS
#    undef _FILE_OFFSET_BITS
#  endif
#endif

#define ZLIB_INTERNAL

#include <stdio.h>
#include "zlib.h"
#ifdef STDC
#  include <string.h>
#  include <stdlib.h>
#  include <limits.h>
#endif
#include <fcntl.h>

#ifdef NO_DEFLATE       /* for compatibility with old definition */
#  define NO_GZCOMPRESS
#endif

#ifdef _MSC_VER
#  include <io.h>
#  define vsnprintf _vsnprintf
#endif

#ifndef local
#  define local static
#endif
/* compile with -Dlocal if your debugger can't find static symbols */

/* gz* functions always use library allocation functions */
#ifndef STDC
  extern voidp  malloc OF((uInt size));
  extern void   free   OF((voidpf ptr));
#endif

/* get errno and strerror definition */
#if defined UNDER_CE && defined NO_ERRNO_H
#  include <windows.h>
#  define zstrerror() gz_strwinerror((DWORD)GetLastError())
#else
#  ifdef STDC
#    include <errno.h>
#    define zstrerror() strerror(errno)
#  else
#    define zstrerror() "stdio error (consult errno)"
#  endif
#endif

/* MVS fdopen() */
#ifdef __MVS__
  #pragma map (fdopen , "\174\174FDOPEN")
   FILE *fdopen(int, const char *);
#endif

#ifdef _LARGEFILE64_SOURCE
#  define z_off64_t off64_t
#else
#  define z_off64_t z_off_t
#endif

/* default i/o buffer size -- double this for output when reading */
#define GZBUFSIZE 8192

/* gzip modes, also provide a little integrity check on the passed structure */
#define GZ_NONE 0
#define GZ_READ 7247
#define GZ_WRITE 31153
#define GZ_APPEND 1     /* mode set to GZ_WRITE after the file is opened */

/* values for gz_state how */
#define LOOK 0      /* look for a gzip header */
#define COPY 1      /* copy input directly */
#define GZIP 2      /* decompress a gzip stream */

/* internal gzip file state data structure */
typedef struct {
        /* used for both reading and writing */
    int mode;               /* see gzip modes above */
    int fd;                 /* file descriptor */
    char *path;             /* path or fd for error messages */
    z_off64_t pos;          /* current position in uncompressed data */
    unsigned size;          /* buffer size, zero if not allocated yet */
    unsigned want;          /* requested buffer size, default is GZBUFSIZE */
    unsigned char *in;      /* input buffer */
    unsigned char *out;     /* output buffer (double-sized when reading) */
    unsigned char *next;    /* next output data to deliver or write */
        /* just for reading */
    unsigned have;          /* amount of output data unused at next */
    int eof;                /* true if end of input file reached */
    z_off64_t start;        /* where the gzip data started, for rewinding */
    z_off64_t raw;          /* where the raw data started, for seeking */
    int how;                /* 0: get header, 1: copy, 2: decompress */
    int direct;             /* true if last read direct, false if gzip */
        /* just for writing */
    int level;              /* compression level */
    int strategy;           /* compression strategy */
        /* seek request */
    z_off64_t skip;         /* amount to skip (already rewound if backwards) */
    int seek;               /* true if seek request pending */
        /* error information */
    int err;                /* error code */
    char *msg;              /* error message */
        /* zlib inflate or deflate stream */
    z_stream strm;          /* stream structure in-place (not a pointer) */
} gz_state;
typedef gz_state FAR *gz_statep;

/* shared functions */
ZEXTERN void ZEXPORT gz_error OF((gz_statep, int, const char *));
#if defined UNDER_CE && defined NO_ERRNO_H
ZEXTERN char ZEXPORT *gz_strwinerror OF((DWORD error));
#endif

/* GT_OFF(x), where x is an unsigned value, is true if x > maximum z_off64_t
   value -- needed when comparing unsigned to z_off64_t, which is signed
   (possible z_off64_t types off_t, off64_t, and long are all signed) */
#ifdef INT_MAX
#  define GT_OFF(x) (sizeof(int) == sizeof(z_off64_t) && (x) > INT_MAX)
#else
ZEXTERN unsigned ZEXPORT gz_intmax OF((void));
#  define GT_OFF(x) (sizeof(int) == sizeof(z_off64_t) && (x) > gz_intmax())
#endif