/*

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

 *

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

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

 * published by the Free Software Foundation.  Oracle designates this

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

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

 *

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

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

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

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

 * accompanied this code).

 *

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

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

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

 *

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

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

 * questions.

 */

/* 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 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

#ifdef HAVE_HIDDEN

#  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

#ifndef _POSIX_SOURCE

#  define _POSIX_SOURCE

#endif

#include <fcntl.h>

#ifdef _WIN32

#  include <stddef.h>

#endif

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

#  include <io.h>

#endif

#if defined(_WIN32) || defined(__CYGWIN__)

#  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 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