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 /* 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 1

 #  endif

 #  ifdef _FILE_OFFSET_BITS

 #    undef _FILE_OFFSET_BITS

 #  endif

 #endif

 #if ((__GNUC__-0) * 10 + __GNUC_MINOR__-0 >= 33) && !defined(NO_VIZ)

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

 #else

 #  define ZLIB_INTERNAL

 #endif

 #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

 #  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

 /* 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 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 */

 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