FreeBSD/Linux Kernel Cross Reference
sys/contrib/zstd/zlibWrapper/gzguts.h

     /* gzguts.h contains minimal changes required to be compiled with zlibWrapper:
      * - #include "zlib.h" was changed to #include "zstd_zlibwrapper.h"
      * - gz_statep was converted to union to work with -Wstrict-aliasing=1      */
     
     /* gzguts.h -- zlib internal header definitions for gz* operations
      * Copyright (C) 2004, 2005, 2010, 2011, 2012, 2013, 2016 Mark Adler
      * For conditions of distribution and use, see http://www.zlib.net/zlib_license.html
      */
     
    #ifdef _LARGEFILE64_SOURCE
    #  ifndef _LARGEFILE_SOURCE
    #    define _LARGEFILE_SOURCE 1
    #  endif
    #  ifdef _FILE_OFFSET_BITS
    #    undef _FILE_OFFSET_BITS
    #  endif
    #endif
    
    #ifdef HAVE_HIDDEN
    #  define ZLIB_INTERNAL __attribute__((visibility ("hidden")))
    #else
    #  define ZLIB_INTERNAL
    #endif
    
    #include <stdio.h>
    #include "zstd_zlibwrapper.h"
    #include "gzcompatibility.h"
    #ifdef STDC
    #  include <string.h>
    #  include <stdlib.h>
    #  include <limits.h>
    #endif
    
    #ifndef _POSIX_SOURCE
    #  define _POSIX_SOURCE
    #endif
    #include <fcntl.h>
    
    #ifdef _WIN32
    #  include <stddef.h>
    #else
    #  include <unistd.h>
    #endif
    
    #if defined(__TURBOC__) || defined(_MSC_VER) || defined(_WIN32)
    #  include <io.h>
    #endif
    
    #if defined(_WIN32)
    #  define WIDECHAR
    #endif
    
    #ifdef WINAPI_FAMILY
    #  define open _open
    #  define read _read
    #  define write _write
    #  define close _close
    #endif
    
    #ifdef NO_DEFLATE       /* for compatibility with old definition */
    #  define NO_GZCOMPRESS
    #endif
    
    #if defined(STDC99) || (defined(__TURBOC__) && __TURBOC__ >= 0x550)
    #  ifndef HAVE_VSNPRINTF
    #    define HAVE_VSNPRINTF
    #  endif
    #endif
    
    #if defined(__CYGWIN__)
    #  ifndef HAVE_VSNPRINTF
    #    define HAVE_VSNPRINTF
    #  endif
    #endif
    
    #if defined(MSDOS) && defined(__BORLANDC__) && (BORLANDC > 0x410)
    #  ifndef HAVE_VSNPRINTF
    #    define HAVE_VSNPRINTF
    #  endif
    #endif
    
    #ifndef HAVE_VSNPRINTF
    #  ifdef MSDOS
    /* vsnprintf may exist on some MS-DOS compilers (DJGPP?),
       but for now we just assume it doesn't. */
    #    define NO_vsnprintf
    #  endif
    #  ifdef __TURBOC__
    #    define NO_vsnprintf
    #  endif
    #  ifdef WIN32
    /* In Win32, vsnprintf is available as the "non-ANSI" _vsnprintf. */
    #    if !defined(vsnprintf) && !defined(NO_vsnprintf)
    #      if !defined(_MSC_VER) || ( defined(_MSC_VER) && _MSC_VER < 1500 )
    #         define vsnprintf _vsnprintf
    #      endif
    #    endif
    #  endif
    #  ifdef __SASC
   #    define NO_vsnprintf
   #  endif
   #  ifdef VMS
   #    define NO_vsnprintf
   #  endif
   #  ifdef __OS400__
   #    define NO_vsnprintf
   #  endif
   #  ifdef __MVS__
   #    define NO_vsnprintf
   #  endif
   #endif
   
   /* unlike snprintf (which is required in C99), _snprintf does not guarantee
      null termination of the result -- however this is only used in gzlib.c where
      the result is assured to fit in the space provided */
   #if defined(_MSC_VER) && _MSC_VER < 1900
   #  define snprintf _snprintf
   #endif
   
   #ifndef local
   #  define local static
   #endif
   /* since "static" is used to mean two completely different things in C, we
      define "local" for the non-static meaning of "static", for readability
      (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
   #  include <windows.h>
   #  define zstrerror() gz_strwinerror((DWORD)GetLastError())
   #else
   #  ifndef NO_STRERROR
   #    include <errno.h>
   #    define zstrerror() strerror(errno)
   #  else
   #    define zstrerror() "stdio error (consult errno)"
   #  endif
   #endif
   
   /* provide prototypes for these when building zlib without LFS */
   #if !defined(_LARGEFILE64_SOURCE) || _LFS64_LARGEFILE-0 == 0
       ZEXTERN gzFile ZEXPORT gzopen64 OF((const char *, const char *));
       ZEXTERN z_off64_t ZEXPORT gzseek64 OF((gzFile, z_off64_t, int));
       ZEXTERN z_off64_t ZEXPORT gztell64 OF((gzFile));
       ZEXTERN z_off64_t ZEXPORT gzoffset64 OF((gzFile));
   #endif
   
   /* default memLevel */
   #if MAX_MEM_LEVEL >= 8
   #  define DEF_MEM_LEVEL 8
   #else
   #  define DEF_MEM_LEVEL  MAX_MEM_LEVEL
   #endif
   
   /* default i/o buffer size -- double this for output when reading (this and
      twice this must be able to fit in an unsigned type) */
   #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 {
           /* exposed contents for gzgetc() macro */
       struct gzFile_s x;      /* "x" for exposed */
                               /* x.have: number of bytes available at x.next */
                               /* x.next: next output data to deliver or write */
                               /* x.pos: current position in uncompressed data */
           /* used for both reading and writing */
       int mode;               /* see gzip modes above */
       int fd;                 /* file descriptor */
       char *path;             /* path or fd for error messages */
       unsigned size;          /* buffer size, zero if not allocated yet */
       unsigned want;          /* requested buffer size, default is GZBUFSIZE */
       unsigned char *in;      /* input buffer (double-sized when writing) */
       unsigned char *out;     /* output buffer (double-sized when reading) */
       int direct;             /* 0 if processing gzip, 1 if transparent */
           /* just for reading */
       int how;                /* 0: get header, 1: copy, 2: decompress */
       z_off64_t start;        /* where the gzip data started, for rewinding */
       int eof;                /* true if end of input file reached */
       int past;               /* true if read requested past end */
           /* 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 union {
       gz_state FAR *state;
       gzFile file;
   } gz_statep;
   
   /* shared functions */
   void ZLIB_INTERNAL gz_error OF((gz_statep, int, const char *));
   #if defined UNDER_CE
   char ZLIB_INTERNAL *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
   unsigned ZLIB_INTERNAL gz_intmax OF((void));
   #  define GT_OFF(x) (sizeof(int) == sizeof(z_off64_t) && (x) > gz_intmax())
   #endif

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