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 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 #if ((__GNUC__-0) * 10 + __GNUC_MINOR__-0 >= 33) && !defined(NO_VIZ)
  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 NO_DEFLATE       /* for compatibility with old definition */
  55 #  define NO_GZCOMPRESS
  56 #endif
  57 
  58 #ifdef _MSC_VER
  59 #  include <io.h>
  60 #  define vsnprintf _vsnprintf
  61 #endif
  62 
  63 #ifndef local
  64 #  define local static
  65 #endif
  66 /* compile with -Dlocal if your debugger can't find static symbols */
  67 
  68 /* gz* functions always use library allocation functions */
  69 #ifndef STDC
  70   extern voidp  malloc OF((uInt size));
  71   extern void   free   OF((voidpf ptr));
  72 #endif
  73 
  74 /* get errno and strerror definition */
  75 #if defined UNDER_CE
  76 #  include <windows.h>
  77 #  define zstrerror() gz_strwinerror((DWORD)GetLastError())
  78 #else
  79 #  ifdef STDC
  80 #    include <errno.h>
  81 #    define zstrerror() strerror(errno)
  82 #  else
  83 #    define zstrerror() "stdio error (consult errno)"
  84 #  endif
  85 #endif
  86 
  87 /* provide prototypes for these when building zlib without LFS */
  88 #if !defined(_LARGEFILE64_SOURCE) || _LFS64_LARGEFILE-0 == 0
  89     ZEXTERN gzFile ZEXPORT gzopen64 OF((const char *, const char *));
  90     ZEXTERN z_off64_t ZEXPORT gzseek64 OF((gzFile, z_off64_t, int));
  91     ZEXTERN z_off64_t ZEXPORT gztell64 OF((gzFile));
  92     ZEXTERN z_off64_t ZEXPORT gzoffset64 OF((gzFile));
  93 #endif
  94 
  95 /* default i/o buffer size -- double this for output when reading */
  96 #define GZBUFSIZE 8192
  97 
  98 /* gzip modes, also provide a little integrity check on the passed structure */
  99 #define GZ_NONE 0
 100 #define GZ_READ 7247
 101 #define GZ_WRITE 31153
 102 #define GZ_APPEND 1     /* mode set to GZ_WRITE after the file is opened */
 103 
 104 /* values for gz_state how */
 105 #define LOOK 0      /* look for a gzip header */
 106 #define COPY 1      /* copy input directly */
 107 #define GZIP 2      /* decompress a gzip stream */
 108 
 109 /* internal gzip file state data structure */
 110 typedef struct {
 111         /* used for both reading and writing */
 112     int mode;               /* see gzip modes above */
 113     int fd;                 /* file descriptor */
 114     char *path;             /* path or fd for error messages */
 115     z_off64_t pos;          /* current position in uncompressed data */
 116     unsigned size;          /* buffer size, zero if not allocated yet */
 117     unsigned want;          /* requested buffer size, default is GZBUFSIZE */
 118     unsigned char *in;      /* input buffer */
 119     unsigned char *out;     /* output buffer (double-sized when reading) */
 120     unsigned char *next;    /* next output data to deliver or write */
 121         /* just for reading */
 122     unsigned have;          /* amount of output data unused at next */
 123     int eof;                /* true if end of input file reached */
 124     z_off64_t start;        /* where the gzip data started, for rewinding */
 125     z_off64_t raw;          /* where the raw data started, for seeking */
 126     int how;                /* 0: get header, 1: copy, 2: decompress */
 127     int direct;             /* true if last read direct, false if gzip */
 128         /* just for writing */
 129     int level;              /* compression level */
 130     int strategy;           /* compression strategy */
 131         /* seek request */
 132     z_off64_t skip;         /* amount to skip (already rewound if backwards) */
 133     int seek;               /* true if seek request pending */
 134         /* error information */
 135     int err;                /* error code */
 136     char *msg;              /* error message */
 137         /* zlib inflate or deflate stream */
 138     z_stream strm;          /* stream structure in-place (not a pointer) */
 139 } gz_state;
 140 typedef gz_state FAR *gz_statep;
 141 
 142 /* shared functions */
 143 void ZLIB_INTERNAL gz_error OF((gz_statep, int, const char *));
 144 #if defined UNDER_CE
 145 char ZLIB_INTERNAL *gz_strwinerror OF((DWORD error));
 146 #endif
 147 
 148 /* GT_OFF(x), where x is an unsigned value, is true if x > maximum z_off64_t
 149    value -- needed when comparing unsigned to z_off64_t, which is signed
 150    (possible z_off64_t types off_t, off64_t, and long are all signed) */
 151 #ifdef INT_MAX
 152 #  define GT_OFF(x) (sizeof(int) == sizeof(z_off64_t) && (x) > INT_MAX)
 153 #else
 154 unsigned ZLIB_INTERNAL gz_intmax OF((void));
 155 #  define GT_OFF(x) (sizeof(int) == sizeof(z_off64_t) && (x) > gz_intmax())
 156 #endif