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#ifndef GZGUTS_H_
#define GZGUTS_H_
/* gzguts.h -- zlib internal header definitions for gz* operations
* Copyright (C) 2004-2024 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
# undef _FILE_OFFSET_BITS
# undef _TIME_BITS
#endif
#if defined(HAVE_VISIBILITY_INTERNAL)
# define Z_INTERNAL __attribute__((visibility ("internal")))
#elif defined(HAVE_VISIBILITY_HIDDEN)
# define Z_INTERNAL __attribute__((visibility ("hidden")))
#else
# define Z_INTERNAL
#endif
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <limits.h>
#include <fcntl.h>
#if defined(ZLIB_COMPAT)
# include "zlib.h"
#else
# include "zlib-ng.h"
#endif
#ifdef _WIN32
# include <stddef.h>
#endif
#if defined(_WIN32)
# include <io.h>
# define WIDECHAR
#endif
#ifdef WINAPI_FAMILY
# define open _open
# define read _read
# define write _write
# define close _close
#endif
/* In Win32, vsnprintf is available as the "non-ANSI" _vsnprintf. */
#if !defined(STDC99) && !defined(__CYGWIN__) && !defined(__MINGW__) && defined(_WIN32)
# if !defined(vsnprintf)
# if !defined(_MSC_VER) || ( defined(_MSC_VER) && _MSC_VER < 1500 )
# define vsnprintf _vsnprintf
# endif
# 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
/* get errno and strerror definition */
#ifndef NO_STRERROR
# include <errno.h>
# define zstrerror() strerror(errno)
#else
# define zstrerror() "stdio error (consult errno)"
#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) */
#ifndef GZBUFSIZE
# define GZBUFSIZE 131072
#endif
/* 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 */
int reset; /* true if a reset is pending after a Z_FINISH */
/* 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 */
PREFIX3(stream) strm; /* stream structure in-place (not a pointer) */
} gz_state;
typedef gz_state *gz_statep;
/* shared functions */
void Z_INTERNAL gz_error(gz_state *, int, const char *);
#ifdef ZLIB_COMPAT
unsigned Z_INTERNAL gz_intmax(void);
#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) */
#define GT_OFF(x) (sizeof(int) == sizeof(z_off64_t) && (x) > INT_MAX)
#endif /* GZGUTS_H_ */
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