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 <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 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
133