1 /*

     2  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

     3  *

     4  * This code is free software; you can redistribute it and/or modify it

     5  * under the terms of the GNU General Public License version 2 only, as

     6  * published by the Free Software Foundation.  Oracle designates this

     7  * particular file as subject to the "Classpath" exception as provided

     8  * by Oracle in the LICENSE file that accompanied this code.

     9  *

    10  * This code is distributed in the hope that it will be useful, but WITHOUT

    11  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    12  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    13  * version 2 for more details (a copy is included in the LICENSE file that

    14  * accompanied this code).

    15  *

    16  * You should have received a copy of the GNU General Public License version

    17  * 2 along with this work; if not, write to the Free Software Foundation,

    18  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    19  *

    20  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

    21  * or visit www.oracle.com if you need additional information or have any

    22  * questions.

    23  */

    24 

    25 /* gzguts.h -- zlib internal header definitions for gz* operations

    26  * Copyright (C) 2004, 2005, 2010, 2011, 2012, 2013 Mark Adler

    27  * For conditions of distribution and use, see copyright notice in zlib.h

    28  */

    29 

    30 #ifdef _LARGEFILE64_SOURCE

    31 #  ifndef _LARGEFILE_SOURCE

    32 #    define _LARGEFILE_SOURCE 1

    33 #  endif

    34 #  ifdef _FILE_OFFSET_BITS

    35 #    undef _FILE_OFFSET_BITS

    36 #  endif

    37 #endif

    38 

    39 #ifdef HAVE_HIDDEN

    40 #  define ZLIB_INTERNAL __attribute__((visibility ("hidden")))

    41 #else

    42 #  define ZLIB_INTERNAL

    43 #endif

    44 

    45 #include <stdio.h>

    46 #include "zlib.h"

    47 #ifdef STDC

    48 #  include <string.h>

    49 #  include <stdlib.h>

    50 #  include <limits.h>

    51 #endif

    52 #include <fcntl.h>

    53 

    54 #ifdef _WIN32

    55 #  include <stddef.h>

    56 #endif

    57 

    58 #if defined(__TURBOC__) || defined(_MSC_VER) || defined(_WIN32)

    59 #  include <io.h>

    60 #endif

    61 

    62 #ifdef WINAPI_FAMILY

    63 #  define open _open

    64 #  define read _read

    65 #  define write _write

    66 #  define close _close

    67 #endif

    68 

    69 #ifdef NO_DEFLATE       /* for compatibility with old definition */

    70 #  define NO_GZCOMPRESS

    71 #endif

    72 

    73 #if defined(STDC99) || (defined(__TURBOC__) && __TURBOC__ >= 0x550)

    74 #  ifndef HAVE_VSNPRINTF

    75 #    define HAVE_VSNPRINTF

    76 #  endif

    77 #endif

    78 

    79 #if defined(__CYGWIN__)

    80 #  ifndef HAVE_VSNPRINTF

    81 #    define HAVE_VSNPRINTF

    82 #  endif

    83 #endif

    84 

    85 #if defined(MSDOS) && defined(__BORLANDC__) && (BORLANDC > 0x410)

    86 #  ifndef HAVE_VSNPRINTF

    87 #    define HAVE_VSNPRINTF

    88 #  endif

    89 #endif

    90 

    91 #ifndef HAVE_VSNPRINTF

    92 #  ifdef MSDOS

    93 /* vsnprintf may exist on some MS-DOS compilers (DJGPP?),

    94    but for now we just assume it doesn't. */

    95 #    define NO_vsnprintf

    96 #  endif

    97 #  ifdef __TURBOC__

    98 #    define NO_vsnprintf

    99 #  endif

   100 #  ifdef WIN32

   101 /* In Win32, vsnprintf is available as the "non-ANSI" _vsnprintf. */

   102 #    if !defined(vsnprintf) && !defined(NO_vsnprintf)

   103 #      if !defined(_MSC_VER) || ( defined(_MSC_VER) && _MSC_VER < 1500 )

   104 #         define vsnprintf _vsnprintf

   105 #      endif

   106 #    endif

   107 #  endif

   108 #  ifdef __SASC

   109 #    define NO_vsnprintf

   110 #  endif

   111 #  ifdef VMS

   112 #    define NO_vsnprintf

   113 #  endif

   114 #  ifdef __OS400__

   115 #    define NO_vsnprintf

   116 #  endif

   117 #  ifdef __MVS__

   118 #    define NO_vsnprintf

   119 #  endif

   120 #endif

   121 

   122 /* unlike snprintf (which is required in C99, yet still not supported by

   123    Microsoft more than a decade later!), _snprintf does not guarantee null

   124    termination of the result -- however this is only used in gzlib.c where

   125    the result is assured to fit in the space provided */

   126 #ifdef _MSC_VER

   127 #  define snprintf _snprintf

   128 #endif

   129 

   130 #ifndef local

   131 #  define local static

   132 #endif

   133 /* compile with -Dlocal if your debugger can't find static symbols */

   134 

   135 /* gz* functions always use library allocation functions */

   136 #ifndef STDC

   137   extern voidp  malloc OF((uInt size));

   138   extern void   free   OF((voidpf ptr));

   139 #endif

   140 

   141 /* get errno and strerror definition */

   142 #if defined UNDER_CE

   143 #  include <windows.h>

   144 #  define zstrerror() gz_strwinerror((DWORD)GetLastError())

   145 #else

   146 #  ifndef NO_STRERROR

   147 #    include <errno.h>

   148 #    define zstrerror() strerror(errno)

   149 #  else

   150 #    define zstrerror() "stdio error (consult errno)"

   151 #  endif

   152 #endif

   153 

   154 /* provide prototypes for these when building zlib without LFS */

   155 #if !defined(_LARGEFILE64_SOURCE) || _LFS64_LARGEFILE-0 == 0

   156     ZEXTERN gzFile ZEXPORT gzopen64 OF((const char *, const char *));

   157     ZEXTERN z_off64_t ZEXPORT gzseek64 OF((gzFile, z_off64_t, int));

   158     ZEXTERN z_off64_t ZEXPORT gztell64 OF((gzFile));

   159     ZEXTERN z_off64_t ZEXPORT gzoffset64 OF((gzFile));

   160 #endif

   161 

   162 /* default memLevel */

   163 #if MAX_MEM_LEVEL >= 8

   164 #  define DEF_MEM_LEVEL 8

   165 #else

   166 #  define DEF_MEM_LEVEL  MAX_MEM_LEVEL

   167 #endif

   168 

   169 /* default i/o buffer size -- double this for output when reading (this and

   170    twice this must be able to fit in an unsigned type) */

   171 #define GZBUFSIZE 8192

   172 

   173 /* gzip modes, also provide a little integrity check on the passed structure */

   174 #define GZ_NONE 0

   175 #define GZ_READ 7247

   176 #define GZ_WRITE 31153

   177 #define GZ_APPEND 1     /* mode set to GZ_WRITE after the file is opened */

   178 

   179 /* values for gz_state how */

   180 #define LOOK 0      /* look for a gzip header */

   181 #define COPY 1      /* copy input directly */

   182 #define GZIP 2      /* decompress a gzip stream */

   183 

   184 /* internal gzip file state data structure */

   185 typedef struct {

   186         /* exposed contents for gzgetc() macro */

   187     struct gzFile_s x;      /* "x" for exposed */

   188                             /* x.have: number of bytes available at x.next */

   189                             /* x.next: next output data to deliver or write */

   190                             /* x.pos: current position in uncompressed data */

   191         /* used for both reading and writing */

   192     int mode;               /* see gzip modes above */

   193     int fd;                 /* file descriptor */

   194     char *path;             /* path or fd for error messages */

   195     unsigned size;          /* buffer size, zero if not allocated yet */

   196     unsigned want;          /* requested buffer size, default is GZBUFSIZE */

   197     unsigned char *in;      /* input buffer */

   198     unsigned char *out;     /* output buffer (double-sized when reading) */

   199     int direct;             /* 0 if processing gzip, 1 if transparent */

   200         /* just for reading */

   201     int how;                /* 0: get header, 1: copy, 2: decompress */

   202     z_off64_t start;        /* where the gzip data started, for rewinding */

   203     int eof;                /* true if end of input file reached */

   204     int past;               /* true if read requested past end */

   205         /* just for writing */

   206     int level;              /* compression level */

   207     int strategy;           /* compression strategy */

   208         /* seek request */

   209     z_off64_t skip;         /* amount to skip (already rewound if backwards) */

   210     int seek;               /* true if seek request pending */

   211         /* error information */

   212     int err;                /* error code */

   213     char *msg;              /* error message */

   214         /* zlib inflate or deflate stream */

   215     z_stream strm;          /* stream structure in-place (not a pointer) */

   216 } gz_state;

   217 typedef gz_state FAR *gz_statep;

   218 

   219 /* shared functions */

   220 void ZLIB_INTERNAL gz_error OF((gz_statep, int, const char *));

   221 #if defined UNDER_CE

   222 char ZLIB_INTERNAL *gz_strwinerror OF((DWORD error));

   223 #endif

   224 

   225 /* GT_OFF(x), where x is an unsigned value, is true if x > maximum z_off64_t

   226    value -- needed when comparing unsigned to z_off64_t, which is signed

   227    (possible z_off64_t types off_t, off64_t, and long are all signed) */

   228 #ifdef INT_MAX

   229 #  define GT_OFF(x) (sizeof(int) == sizeof(z_off64_t) && (x) > INT_MAX)

   230 #else

   231 unsigned ZLIB_INTERNAL gz_intmax OF((void));

   232 #  define GT_OFF(x) (sizeof(int) == sizeof(z_off64_t) && (x) > gz_intmax())

   233 #endif