Chris@4: /* gzguts.h -- zlib internal header definitions for gz* operations
Chris@4:  * Copyright (C) 2004, 2005, 2010, 2011, 2012 Mark Adler
Chris@4:  * For conditions of distribution and use, see copyright notice in zlib.h
Chris@4:  */
Chris@4: 
Chris@4: #ifdef _LARGEFILE64_SOURCE
Chris@4: #  ifndef _LARGEFILE_SOURCE
Chris@4: #    define _LARGEFILE_SOURCE 1
Chris@4: #  endif
Chris@4: #  ifdef _FILE_OFFSET_BITS
Chris@4: #    undef _FILE_OFFSET_BITS
Chris@4: #  endif
Chris@4: #endif
Chris@4: 
Chris@4: #ifdef HAVE_HIDDEN
Chris@4: #  define ZLIB_INTERNAL __attribute__((visibility ("hidden")))
Chris@4: #else
Chris@4: #  define ZLIB_INTERNAL
Chris@4: #endif
Chris@4: 
Chris@4: #include <stdio.h>
Chris@4: #include "zlib.h"
Chris@4: #ifdef STDC
Chris@4: #  include <string.h>
Chris@4: #  include <stdlib.h>
Chris@4: #  include <limits.h>
Chris@4: #endif
Chris@4: #include <fcntl.h>
Chris@4: 
Chris@4: #ifdef _WIN32
Chris@4: #  include <stddef.h>
Chris@4: #endif
Chris@4: 
Chris@4: #if defined(__TURBOC__) || defined(_MSC_VER) || defined(_WIN32)
Chris@4: #  include <io.h>
Chris@4: #endif
Chris@4: 
Chris@4: #ifdef NO_DEFLATE       /* for compatibility with old definition */
Chris@4: #  define NO_GZCOMPRESS
Chris@4: #endif
Chris@4: 
Chris@4: #if defined(STDC99) || (defined(__TURBOC__) && __TURBOC__ >= 0x550)
Chris@4: #  ifndef HAVE_VSNPRINTF
Chris@4: #    define HAVE_VSNPRINTF
Chris@4: #  endif
Chris@4: #endif
Chris@4: 
Chris@4: #if defined(__CYGWIN__)
Chris@4: #  ifndef HAVE_VSNPRINTF
Chris@4: #    define HAVE_VSNPRINTF
Chris@4: #  endif
Chris@4: #endif
Chris@4: 
Chris@4: #if defined(MSDOS) && defined(__BORLANDC__) && (BORLANDC > 0x410)
Chris@4: #  ifndef HAVE_VSNPRINTF
Chris@4: #    define HAVE_VSNPRINTF
Chris@4: #  endif
Chris@4: #endif
Chris@4: 
Chris@4: #ifndef HAVE_VSNPRINTF
Chris@4: #  ifdef MSDOS
Chris@4: /* vsnprintf may exist on some MS-DOS compilers (DJGPP?),
Chris@4:  but for now we just assume it doesn't. */
Chris@4: #    define NO_vsnprintf
Chris@4: #  endif
Chris@4: #  ifdef __TURBOC__
Chris@4: #    define NO_vsnprintf
Chris@4: #  endif
Chris@4: #  ifdef WIN32
Chris@4: /* In Win32, vsnprintf is available as the "non-ANSI" _vsnprintf. */
Chris@4: #    if !defined(vsnprintf) && !defined(NO_vsnprintf)
Chris@4: #      if !defined(_MSC_VER) || ( defined(_MSC_VER) && _MSC_VER < 1500 )
Chris@4: #         define vsnprintf _vsnprintf
Chris@4: #      endif
Chris@4: #    endif
Chris@4: #  endif
Chris@4: #  ifdef __SASC
Chris@4: #    define NO_vsnprintf
Chris@4: #  endif
Chris@4: #  ifdef VMS
Chris@4: #    define NO_vsnprintf
Chris@4: #  endif
Chris@4: #  ifdef __OS400__
Chris@4: #    define NO_vsnprintf
Chris@4: #  endif
Chris@4: #  ifdef __MVS__
Chris@4: #    define NO_vsnprintf
Chris@4: #  endif
Chris@4: #endif
Chris@4: 
Chris@4: #ifndef local
Chris@4: #  define local static
Chris@4: #endif
Chris@4: /* compile with -Dlocal if your debugger can't find static symbols */
Chris@4: 
Chris@4: /* gz* functions always use library allocation functions */
Chris@4: #ifndef STDC
Chris@4:   extern voidp  malloc OF((uInt size));
Chris@4:   extern void   free   OF((voidpf ptr));
Chris@4: #endif
Chris@4: 
Chris@4: /* get errno and strerror definition */
Chris@4: #if defined UNDER_CE
Chris@4: #  include <windows.h>
Chris@4: #  define zstrerror() gz_strwinerror((DWORD)GetLastError())
Chris@4: #else
Chris@4: #  ifndef NO_STRERROR
Chris@4: #    include <errno.h>
Chris@4: #    define zstrerror() strerror(errno)
Chris@4: #  else
Chris@4: #    define zstrerror() "stdio error (consult errno)"
Chris@4: #  endif
Chris@4: #endif
Chris@4: 
Chris@4: /* provide prototypes for these when building zlib without LFS */
Chris@4: #if !defined(_LARGEFILE64_SOURCE) || _LFS64_LARGEFILE-0 == 0
Chris@4:     ZEXTERN gzFile ZEXPORT gzopen64 OF((const char *, const char *));
Chris@4:     ZEXTERN z_off64_t ZEXPORT gzseek64 OF((gzFile, z_off64_t, int));
Chris@4:     ZEXTERN z_off64_t ZEXPORT gztell64 OF((gzFile));
Chris@4:     ZEXTERN z_off64_t ZEXPORT gzoffset64 OF((gzFile));
Chris@4: #endif
Chris@4: 
Chris@4: /* default memLevel */
Chris@4: #if MAX_MEM_LEVEL >= 8
Chris@4: #  define DEF_MEM_LEVEL 8
Chris@4: #else
Chris@4: #  define DEF_MEM_LEVEL  MAX_MEM_LEVEL
Chris@4: #endif
Chris@4: 
Chris@4: /* default i/o buffer size -- double this for output when reading */
Chris@4: #define GZBUFSIZE 8192
Chris@4: 
Chris@4: /* gzip modes, also provide a little integrity check on the passed structure */
Chris@4: #define GZ_NONE 0
Chris@4: #define GZ_READ 7247
Chris@4: #define GZ_WRITE 31153
Chris@4: #define GZ_APPEND 1     /* mode set to GZ_WRITE after the file is opened */
Chris@4: 
Chris@4: /* values for gz_state how */
Chris@4: #define LOOK 0      /* look for a gzip header */
Chris@4: #define COPY 1      /* copy input directly */
Chris@4: #define GZIP 2      /* decompress a gzip stream */
Chris@4: 
Chris@4: /* internal gzip file state data structure */
Chris@4: typedef struct {
Chris@4:         /* exposed contents for gzgetc() macro */
Chris@4:     struct gzFile_s x;      /* "x" for exposed */
Chris@4:                             /* x.have: number of bytes available at x.next */
Chris@4:                             /* x.next: next output data to deliver or write */
Chris@4:                             /* x.pos: current position in uncompressed data */
Chris@4:         /* used for both reading and writing */
Chris@4:     int mode;               /* see gzip modes above */
Chris@4:     int fd;                 /* file descriptor */
Chris@4:     char *path;             /* path or fd for error messages */
Chris@4:     unsigned size;          /* buffer size, zero if not allocated yet */
Chris@4:     unsigned want;          /* requested buffer size, default is GZBUFSIZE */
Chris@4:     unsigned char *in;      /* input buffer */
Chris@4:     unsigned char *out;     /* output buffer (double-sized when reading) */
Chris@4:     int direct;             /* 0 if processing gzip, 1 if transparent */
Chris@4:         /* just for reading */
Chris@4:     int how;                /* 0: get header, 1: copy, 2: decompress */
Chris@4:     z_off64_t start;        /* where the gzip data started, for rewinding */
Chris@4:     int eof;                /* true if end of input file reached */
Chris@4:     int past;               /* true if read requested past end */
Chris@4:         /* just for writing */
Chris@4:     int level;              /* compression level */
Chris@4:     int strategy;           /* compression strategy */
Chris@4:         /* seek request */
Chris@4:     z_off64_t skip;         /* amount to skip (already rewound if backwards) */
Chris@4:     int seek;               /* true if seek request pending */
Chris@4:         /* error information */
Chris@4:     int err;                /* error code */
Chris@4:     char *msg;              /* error message */
Chris@4:         /* zlib inflate or deflate stream */
Chris@4:     z_stream strm;          /* stream structure in-place (not a pointer) */
Chris@4: } gz_state;
Chris@4: typedef gz_state FAR *gz_statep;
Chris@4: 
Chris@4: /* shared functions */
Chris@4: void ZLIB_INTERNAL gz_error OF((gz_statep, int, const char *));
Chris@4: #if defined UNDER_CE
Chris@4: char ZLIB_INTERNAL *gz_strwinerror OF((DWORD error));
Chris@4: #endif
Chris@4: 
Chris@4: /* GT_OFF(x), where x is an unsigned value, is true if x > maximum z_off64_t
Chris@4:    value -- needed when comparing unsigned to z_off64_t, which is signed
Chris@4:    (possible z_off64_t types off_t, off64_t, and long are all signed) */
Chris@4: #ifdef INT_MAX
Chris@4: #  define GT_OFF(x) (sizeof(int) == sizeof(z_off64_t) && (x) > INT_MAX)
Chris@4: #else
Chris@4: unsigned ZLIB_INTERNAL gz_intmax OF((void));
Chris@4: #  define GT_OFF(x) (sizeof(int) == sizeof(z_off64_t) && (x) > gz_intmax())
Chris@4: #endif