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#ifndef ZUTIL_H_
#define ZUTIL_H_
/* zutil.h -- internal interface and configuration of the compression library
* Copyright (C) 1995-2016 Jean-loup Gailly, Mark Adler
* For conditions of distribution and use, see copyright notice in zlib.h
*/
/* WARNING: this file should *not* be used by applications. It is
part of the implementation of the compression library and is
subject to change. Applications should only use zlib.h.
*/
#include "zbuild.h"
#ifdef ZLIB_COMPAT
# include "zlib.h"
#else
# include "zlib-ng.h"
#endif
typedef unsigned char uch; /* Included for compatibility with external code only */
typedef uint16_t ush; /* Included for compatibility with external code only */
typedef unsigned long ulg;
extern z_const char * const PREFIX(z_errmsg)[10]; /* indexed by 2-zlib_error */
/* (size given to avoid silly warnings with Visual C++) */
#define ERR_MSG(err) PREFIX(z_errmsg)[Z_NEED_DICT-(err)]
#define ERR_RETURN(strm, err) return (strm->msg = ERR_MSG(err), (err))
/* To be used only when the state is known to be valid */
/* common constants */
#ifndef DEF_WBITS
# define DEF_WBITS MAX_WBITS
#endif
/* default windowBits for decompression. MAX_WBITS is for compression only */
#if MAX_MEM_LEVEL >= 8
# define DEF_MEM_LEVEL 8
#else
# define DEF_MEM_LEVEL MAX_MEM_LEVEL
#endif
/* default memLevel */
#define STORED_BLOCK 0
#define STATIC_TREES 1
#define DYN_TREES 2
/* The three kinds of block type */
#define STD_MIN_MATCH 3
#define STD_MAX_MATCH 258
/* The minimum and maximum match lengths mandated by the deflate standard */
#define WANT_MIN_MATCH 4
/* The minimum wanted match length, affects deflate_quick, deflate_fast, deflate_medium and deflate_slow */
#define PRESET_DICT 0x20 /* preset dictionary flag in zlib header */
#define ADLER32_INITIAL_VALUE 1 /* initial adler-32 hash value */
#define CRC32_INITIAL_VALUE 0 /* initial crc-32 hash value */
#define ZLIB_WRAPLEN 6 /* zlib format overhead */
#define GZIP_WRAPLEN 18 /* gzip format overhead */
#define DEFLATE_HEADER_BITS 3
#define DEFLATE_EOBS_BITS 15
#define DEFLATE_PAD_BITS 6
#define DEFLATE_BLOCK_OVERHEAD ((DEFLATE_HEADER_BITS + DEFLATE_EOBS_BITS + DEFLATE_PAD_BITS) >> 3)
/* deflate block overhead: 3 bits for block start + 15 bits for block end + padding to nearest byte */
#define DEFLATE_QUICK_LIT_MAX_BITS 9
#define DEFLATE_QUICK_OVERHEAD(x) ((x * (DEFLATE_QUICK_LIT_MAX_BITS - 8) + 7) >> 3)
/* deflate_quick worst-case overhead: 9 bits per literal, round up to next byte (+7) */
/* target dependencies */
#ifdef AMIGA
# define OS_CODE 1
#endif
#ifdef __370__
# if __TARGET_LIB__ < 0x20000000
# define OS_CODE 4
# elif __TARGET_LIB__ < 0x40000000
# define OS_CODE 11
# else
# define OS_CODE 8
# endif
#endif
#if defined(ATARI) || defined(atarist)
# define OS_CODE 5
#endif
#ifdef OS2
# define OS_CODE 6
#endif
#if defined(MACOS) || defined(TARGET_OS_MAC)
# define OS_CODE 7
#endif
#ifdef __acorn
# define OS_CODE 13
#endif
#if defined(_WIN32) && !defined(__CYGWIN__)
# define OS_CODE 10
#endif
#ifdef __APPLE__
# define OS_CODE 19
#endif
/* common defaults */
#ifndef OS_CODE
# define OS_CODE 3 /* assume Unix */
#endif
/* memory allocation functions */
void Z_INTERNAL *zng_calloc(void *opaque, unsigned items, unsigned size);
void Z_INTERNAL zng_cfree(void *opaque, void *ptr);
typedef void *zng_calloc_func(void *opaque, unsigned items, unsigned size);
typedef void zng_cfree_func(void *opaque, void *ptr);
void Z_INTERNAL *zng_alloc_aligned(zng_calloc_func zalloc, void *opaque, unsigned items, unsigned size, unsigned align);
void Z_INTERNAL zng_free_aligned(zng_cfree_func zfree, void *opaque, void *ptr);
#define ZALLOC(strm, items, size) zng_alloc_aligned((strm)->zalloc, (strm)->opaque, (items), (size), 64)
#define ZFREE(strm, addr) zng_free_aligned((strm)->zfree, (strm)->opaque, (void *)(addr))
#define TRY_FREE(s, p) {if (p) ZFREE(s, p);}
#endif /* ZUTIL_H_ */
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