zbuild.h - third_party/github.com/zlib-ng/zlib-ng - Git at Google

 #ifndef _ZBUILD_H
 #define _ZBUILD_H

 #define _POSIX_SOURCE 1  /* fileno */
 #ifndef _POSIX_C_SOURCE
 #  define _POSIX_C_SOURCE 200809L /* snprintf, posix_memalign, strdup */
 #endif
 #ifndef _ISOC11_SOURCE
 #  define _ISOC11_SOURCE 1 /* aligned_alloc */
 #endif
 #ifdef __OpenBSD__
 #  define _BSD_SOURCE 1
 #endif

 #include <stddef.h>
 #include <string.h>
 #include <stdlib.h>
 #include <stdint.h>
 #include <stdio.h>

 #include "zarch.h"

 /* Determine compiler version of C Standard */
 #ifdef __STDC_VERSION__
 #  if __STDC_VERSION__ >= 199901L
 #    ifndef STDC99
 #      define STDC99
 #    endif
 #  endif
 #  if __STDC_VERSION__ >= 201112L
 #    ifndef STDC11
 #      define STDC11
 #    endif
 #  endif
 #endif

 #ifndef Z_HAS_ATTRIBUTE
 #  if defined(__has_attribute)
 #    define Z_HAS_ATTRIBUTE(a) __has_attribute(a)
 #  else
 #    define Z_HAS_ATTRIBUTE(a) 0
 #  endif
 #endif

 #ifndef Z_FALLTHROUGH
 #  if Z_HAS_ATTRIBUTE(__fallthrough__) || (defined(__GNUC__) && (__GNUC__ >= 7))
 #    define Z_FALLTHROUGH __attribute__((__fallthrough__))
 #  else
 #    define Z_FALLTHROUGH do {} while(0) /* fallthrough */
 #  endif
 #endif

 /* Hint to compiler that a block of code is unreachable, typically in a switch default condition */
 #ifndef Z_UNREACHABLE
 #  if defined(__STDC_VERSION__) && __STDC_VERSION__ >= 202311L
 #    if !defined(unreachable) && defined(_MSC_VER)
 #      define Z_UNREACHABLE() __assume(0)
 #    else
 #      define Z_UNREACHABLE() unreachable()           // C23 approach
 #    endif
 #  elif (defined(__GNUC__) && (__GNUC__ >= 5)) || defined(__clang__)
 #    define Z_UNREACHABLE() __builtin_unreachable()
 #  else
 #    define Z_UNREACHABLE()
 #  endif
 #endif

 #ifndef Z_TARGET
 #  if Z_HAS_ATTRIBUTE(__target__)
 #    define Z_TARGET(x) __attribute__((__target__(x)))
 #  else
 #    define Z_TARGET(x)
 #  endif
 #endif

 /* This has to be first include that defines any types */
 #if defined(_MSC_VER)
 #  if defined(_WIN64)
     typedef __int64 ssize_t;
 #  else
     typedef long ssize_t;
 #  endif

 #  if defined(_WIN64)
     #define SSIZE_MAX _I64_MAX
 #  else
     #define SSIZE_MAX LONG_MAX
 #  endif
 #endif

 /* A forced inline decorator */
 #if defined(_MSC_VER)
 #  define Z_FORCEINLINE __forceinline
 #elif defined(__GNUC__)
 #  define Z_FORCEINLINE inline __attribute__((always_inline))
 #else
     /* It won't actually force inlining but it will suggest it */
 #  define Z_FORCEINLINE inline
 #endif

 /* MS Visual Studio does not allow inline in C, only C++.
    But it provides __inline instead, so use that. */
 #if defined(_MSC_VER) && !defined(inline) && !defined(__cplusplus)
 #  define inline __inline
 #endif

 #if defined(ZLIB_COMPAT)
 #  define PREFIX(x) x
 #  define PREFIX2(x) ZLIB_ ## x
 #  define PREFIX3(x) z_ ## x
 #  define PREFIX4(x) x ## 64
 #  define zVersion zlibVersion
 #else
 #  define PREFIX(x) zng_ ## x
 #  define PREFIX2(x) ZLIBNG_ ## x
 #  define PREFIX3(x) zng_ ## x
 #  define PREFIX4(x) zng_ ## x
 #  define zVersion zlibng_version
 #  define z_size_t size_t
 #endif

 /* In zlib-compat some functions and types use unsigned long, but zlib-ng use size_t */
 #if defined(ZLIB_COMPAT)
 #  define z_uintmax_t unsigned long
 #else
 #  define z_uintmax_t size_t
 #endif

 /* In zlib-compat headers some function return values and parameter types use int or unsigned, but zlib-ng headers use
    int32_t and uint32_t, which will cause type mismatch when compiling zlib-ng if int32_t is long and uint32_t is
    unsigned long */
 #if defined(ZLIB_COMPAT)
 #  define z_int32_t int
 #  define z_uint32_t unsigned int
 #else
 #  define z_int32_t int32_t
 #  define z_uint32_t uint32_t
 #endif

 /* Minimum of a and b. */
 #define MIN(a, b) ((a) > (b) ? (b) : (a))
 /* Maximum of a and b. */
 #define MAX(a, b) ((a) < (b) ? (b) : (a))
 /* Absolute value of a. */
 #define ABS(a) ((a) < 0 ? -(a) : (a))
 /* Ignore unused variable warning */
 #define Z_UNUSED(var) (void)(var)

 /* Force the compiler to treat variable as modified. Empty asm statement with a "+r" constraint prevents
    the compiler from reordering or eliminating loads into the variable. This can help keep critical latency
    chains in the hot path from being shortened or optimized away. */
 #if (defined(__GNUC__) || defined(__clang__)) && \
         (defined(ARCH_X86) || (defined(ARCH_ARM) && defined(ARCH_64BIT)))
 #  define Z_TOUCH(var) __asm__ ("" : "+r"(var))
 #else
 #  define Z_TOUCH(var) (void)(var)
 #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

 /* Symbol versioning helpers, allowing multiple versions of a function to exist.
  * Functions using this must also be added to zlib-ng.map for each version.
  * Double @@ means this is the default for newly compiled applications to link against.
  * Single @ means this is kept for backwards compatibility.
  * This is only used for Zlib-ng native API, and only on platforms supporting this.
  */
 #if defined(HAVE_SYMVER)
 #  define ZSYMVER(func,alias,ver) __asm__(".symver " func ", " alias "@ZLIB_NG_" ver);
 #  define ZSYMVER_DEF(func,alias,ver) __asm__(".symver " func ", " alias "@@ZLIB_NG_" ver);
 #else
 #  define ZSYMVER(func,alias,ver)
 #  define ZSYMVER_DEF(func,alias,ver)
 #endif

 #ifndef __cplusplus
 #  define Z_REGISTER register
 #else
 #  define Z_REGISTER
 #endif

 #if defined(_MSC_VER)
 #  define Z_RESTRICT __restrict
 #elif defined(__STDC_VERSION__) && __STDC_VERSION__ >= 199901L
 #  define Z_RESTRICT restrict
 #else
 #  define Z_RESTRICT __restrict__
 #endif

 /* Reverse the bytes in a value. Use compiler intrinsics when
    possible to take advantage of hardware implementations. */
 #if defined(_MSC_VER) && (_MSC_VER >= 1300)
 #  include <stdlib.h>
 #  pragma intrinsic(_byteswap_ulong)
 #  define ZSWAP16(q) _byteswap_ushort(q)
 #  define ZSWAP32(q) _byteswap_ulong(q)
 #  define ZSWAP64(q) _byteswap_uint64(q)

 #elif defined(__clang__) || (defined(__GNUC__) && \
         (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 8)))
 #  define ZSWAP16(q) __builtin_bswap16(q)
 #  define ZSWAP32(q) __builtin_bswap32(q)
 #  define ZSWAP64(q) __builtin_bswap64(q)

 #elif defined(__GNUC__) && (__GNUC__ >= 2) && defined(__linux__)
 #  include <byteswap.h>
 #  define ZSWAP16(q) bswap_16(q)
 #  define ZSWAP32(q) bswap_32(q)
 #  define ZSWAP64(q) bswap_64(q)

 #elif defined(__FreeBSD__) || defined(__NetBSD__) || defined(__DragonFly__)
 #  include <sys/endian.h>
 #  define ZSWAP16(q) bswap16(q)
 #  define ZSWAP32(q) bswap32(q)
 #  define ZSWAP64(q) bswap64(q)
 #elif defined(__OpenBSD__)
 #  include <sys/endian.h>
 #  define ZSWAP16(q) swap16(q)
 #  define ZSWAP32(q) swap32(q)
 #  define ZSWAP64(q) swap64(q)
 #elif defined(__INTEL_COMPILER)
 /* ICC does not provide a two byte swap. */
 #  define ZSWAP16(q) ((((q) & 0xff) << 8) | (((q) & 0xff00) >> 8))
 #  define ZSWAP32(q) _bswap(q)
 #  define ZSWAP64(q) _bswap64(q)

 #else
 #  define ZSWAP16(q) ((((q) & 0xff) << 8) | (((q) & 0xff00) >> 8))
 #  define ZSWAP32(q) ((((q) >> 24) & 0xff) + (((q) >> 8) & 0xff00) + \
                      (((q) & 0xff00) << 8) + (((q) & 0xff) << 24))
 #  define ZSWAP64(q)                           \
          (((q & 0xFF00000000000000u) >> 56u) | \
           ((q & 0x00FF000000000000u) >> 40u) | \
           ((q & 0x0000FF0000000000u) >> 24u) | \
           ((q & 0x000000FF00000000u) >> 8u)  | \
           ((q & 0x00000000FF000000u) << 8u)  | \
           ((q & 0x0000000000FF0000u) << 24u) | \
           ((q & 0x000000000000FF00u) << 40u) | \
           ((q & 0x00000000000000FFu) << 56u))
 #endif

 /* Only enable likely/unlikely if the compiler is known to support it */
 #if (defined(__GNUC__) && (__GNUC__ >= 3)) || defined(__INTEL_COMPILER) || defined(__clang__)
 #  define LIKELY_NULL(x)        __builtin_expect((x) != 0, 0)
 #  define LIKELY(x)             __builtin_expect(!!(x), 1)
 #  define UNLIKELY(x)           __builtin_expect(!!(x), 0)
 #else
 #  define LIKELY_NULL(x)        x
 #  define LIKELY(x)             x
 #  define UNLIKELY(x)           x
 #endif /* (un)likely */

 #if defined(HAVE_ATTRIBUTE_ALIGNED)
 #  define ALIGNED_(x) __attribute__ ((aligned(x)))
 #elif defined(_MSC_VER)
 #  define ALIGNED_(x) __declspec(align(x))
 #else
 /* TODO: Define ALIGNED_ for your compiler */
 #  define ALIGNED_(x)
 #endif

 #ifdef HAVE_BUILTIN_ASSUME_ALIGNED
 #  define HINT_ALIGNED(p,n) __builtin_assume_aligned((void *)(p),(n))
 #else
 #  define HINT_ALIGNED(p,n) (p)
 #endif
 #define HINT_ALIGNED_16(p) HINT_ALIGNED((p),16)
 #define HINT_ALIGNED_64(p) HINT_ALIGNED((p),64)
 #define HINT_ALIGNED_4096(p) HINT_ALIGNED((p),4096)

 /* Number of bytes needed to align ptr to the next alignment boundary */
 #define ALIGN_DIFF(ptr, align) \
     (((uintptr_t)(align) - ((uintptr_t)(ptr) & ((align) - 1))) & ((align) - 1))

 /* Round up value to the nearest multiple of align (align must be power of 2) */
 #define ALIGN_UP(value, align) \
     (((value) + ((align) - 1)) & ~((align) - 1))

 /* Round down value to the nearest multiple of align (align must be power of 2) */
 #define ALIGN_DOWN(value, align) \
     ((value) & ~((align) - 1))

 /* PADSZ returns needed bytes to pad bpos to pad size
  * PAD_NN calculates pad size and adds it to bpos, returning the result.
  * All take an integer or a pointer as bpos input.
  */
 #define PADSZ(bpos, pad) (((pad) - ((uintptr_t)(bpos) % (pad))) % (pad))
 #define PAD_16(bpos) ((bpos) + PADSZ((bpos),16))
 #define PAD_64(bpos) ((bpos) + PADSZ((bpos),64))
 #define PAD_4096(bpos) ((bpos) + PADSZ((bpos),4096))

 /* Diagnostic functions */
 #ifdef ZLIB_DEBUG
    extern int Z_INTERNAL z_verbose;
    extern void Z_INTERNAL z_error(const char *m);
 #  define Assert(cond, msg) {int _cond = (cond); if (!(_cond)) z_error(msg);}
 #  define Trace(x) {if (z_verbose >= 0) fprintf x;}
 #  define Tracev(x) {if (z_verbose > 0) fprintf x;}
 #  define Tracevv(x) {if (z_verbose > 1) fprintf x;}
 #  define Tracec(c, x) {if (z_verbose > 0 && (c)) fprintf x;}
 #  define Tracecv(c, x) {if (z_verbose > 1 && (c)) fprintf x;}
 #else
 #  define Assert(cond, msg)
 #  define Trace(x)
 #  define Tracev(x)
 #  define Tracevv(x)
 #  define Tracec(c, x)
 #  define Tracecv(c, x)
 #endif

 /* OPTIMAL_CMP values determine the comparison width:
  * 64: Best for 64-bit architectures with unaligned access
  * 32: Best for 32-bit architectures with unaligned access
  * 16: Safe default for unknown architectures
  * 8:  Safe fallback for architectures without unaligned access
  * Note: The unaligned access mentioned is cpu-support, this allows compiler or
  *       separate unaligned intrinsics to utilize safe unaligned access, without
  *       utilizing unaligned C pointers that are known to have undefined behavior.
  */
 #if !defined(OPTIMAL_CMP)
 #  ifdef ARCH_64BIT
 #    ifdef ARCH_ARM
 #      if defined(__ARM_FEATURE_UNALIGNED) || defined(_WIN32)
 #        define OPTIMAL_CMP 64
 #      else
 #        define OPTIMAL_CMP 8
 #      endif
 #    else
 #      define OPTIMAL_CMP 64
 #    endif
 #  elif defined(ARCH_32BIT)
 #    ifdef ARCH_ARM
 #      if defined(__ARM_FEATURE_UNALIGNED) || defined(_WIN32)
 #        define OPTIMAL_CMP 32
 #      else
 #        define OPTIMAL_CMP 8
 #      endif
 #    else
 #      define OPTIMAL_CMP 32
 #    endif
 #  endif
 #endif
 #if !defined(OPTIMAL_CMP)
 #  define OPTIMAL_CMP 16
 #endif

 #endif
	#ifndef _ZBUILD_H
	#define _ZBUILD_H

	#define _POSIX_SOURCE 1 /* fileno */
	#ifndef _POSIX_C_SOURCE
	# define _POSIX_C_SOURCE 200809L /* snprintf, posix_memalign, strdup */
	#endif
	#ifndef _ISOC11_SOURCE
	# define _ISOC11_SOURCE 1 /* aligned_alloc */
	#endif
	#ifdef __OpenBSD__
	# define _BSD_SOURCE 1
	#endif

	#include <stddef.h>
	#include <string.h>
	#include <stdlib.h>
	#include <stdint.h>
	#include <stdio.h>

	#include "zarch.h"

	/* Determine compiler version of C Standard */
	#ifdef __STDC_VERSION__
	# if __STDC_VERSION__ >= 199901L
	# ifndef STDC99
	# define STDC99
	# endif
	# endif
	# if __STDC_VERSION__ >= 201112L
	# ifndef STDC11
	# define STDC11
	# endif
	# endif
	#endif

	#ifndef Z_HAS_ATTRIBUTE
	# if defined(__has_attribute)
	# define Z_HAS_ATTRIBUTE(a) __has_attribute(a)
	# else
	# define Z_HAS_ATTRIBUTE(a) 0
	# endif
	#endif

	#ifndef Z_FALLTHROUGH
	# if Z_HAS_ATTRIBUTE(__fallthrough__) \|\| (defined(__GNUC__) && (__GNUC__ >= 7))
	# define Z_FALLTHROUGH __attribute__((__fallthrough__))
	# else
	# define Z_FALLTHROUGH do {} while(0) /* fallthrough */
	# endif
	#endif

	/* Hint to compiler that a block of code is unreachable, typically in a switch default condition */
	#ifndef Z_UNREACHABLE
	# if defined(__STDC_VERSION__) && __STDC_VERSION__ >= 202311L
	# if !defined(unreachable) && defined(_MSC_VER)
	# define Z_UNREACHABLE() __assume(0)
	# else
	# define Z_UNREACHABLE() unreachable() // C23 approach
	# endif
	# elif (defined(__GNUC__) && (__GNUC__ >= 5)) \|\| defined(__clang__)
	# define Z_UNREACHABLE() __builtin_unreachable()
	# else
	# define Z_UNREACHABLE()
	# endif
	#endif

	#ifndef Z_TARGET
	# if Z_HAS_ATTRIBUTE(__target__)
	# define Z_TARGET(x) __attribute__((__target__(x)))
	# else
	# define Z_TARGET(x)
	# endif
	#endif

	/* This has to be first include that defines any types */
	#if defined(_MSC_VER)
	# if defined(_WIN64)
	typedef __int64 ssize_t;
	# else
	typedef long ssize_t;
	# endif

	# if defined(_WIN64)
	#define SSIZE_MAX _I64_MAX
	# else
	#define SSIZE_MAX LONG_MAX
	# endif
	#endif

	/* A forced inline decorator */
	#if defined(_MSC_VER)
	# define Z_FORCEINLINE __forceinline
	#elif defined(__GNUC__)
	# define Z_FORCEINLINE inline __attribute__((always_inline))
	#else
	/* It won't actually force inlining but it will suggest it */
	# define Z_FORCEINLINE inline
	#endif

	/* MS Visual Studio does not allow inline in C, only C++.
	But it provides __inline instead, so use that. */
	#if defined(_MSC_VER) && !defined(inline) && !defined(__cplusplus)
	# define inline __inline
	#endif

	#if defined(ZLIB_COMPAT)
	# define PREFIX(x) x
	# define PREFIX2(x) ZLIB_ ## x
	# define PREFIX3(x) z_ ## x
	# define PREFIX4(x) x ## 64
	# define zVersion zlibVersion
	#else
	# define PREFIX(x) zng_ ## x
	# define PREFIX2(x) ZLIBNG_ ## x
	# define PREFIX3(x) zng_ ## x
	# define PREFIX4(x) zng_ ## x
	# define zVersion zlibng_version
	# define z_size_t size_t
	#endif

	/* In zlib-compat some functions and types use unsigned long, but zlib-ng use size_t */
	#if defined(ZLIB_COMPAT)
	# define z_uintmax_t unsigned long
	#else
	# define z_uintmax_t size_t
	#endif

	/* In zlib-compat headers some function return values and parameter types use int or unsigned, but zlib-ng headers use
	int32_t and uint32_t, which will cause type mismatch when compiling zlib-ng if int32_t is long and uint32_t is
	unsigned long */
	#if defined(ZLIB_COMPAT)
	# define z_int32_t int
	# define z_uint32_t unsigned int
	#else
	# define z_int32_t int32_t
	# define z_uint32_t uint32_t
	#endif

	/* Minimum of a and b. */
	#define MIN(a, b) ((a) > (b) ? (b) : (a))
	/* Maximum of a and b. */
	#define MAX(a, b) ((a) < (b) ? (b) : (a))
	/* Absolute value of a. */
	#define ABS(a) ((a) < 0 ? -(a) : (a))
	/* Ignore unused variable warning */
	#define Z_UNUSED(var) (void)(var)

	/* Force the compiler to treat variable as modified. Empty asm statement with a "+r" constraint prevents
	the compiler from reordering or eliminating loads into the variable. This can help keep critical latency
	chains in the hot path from being shortened or optimized away. */
	#if (defined(__GNUC__) \|\| defined(__clang__)) && \
	(defined(ARCH_X86) \|\| (defined(ARCH_ARM) && defined(ARCH_64BIT)))
	# define Z_TOUCH(var) __asm__ ("" : "+r"(var))
	#else
	# define Z_TOUCH(var) (void)(var)
	#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

	/* Symbol versioning helpers, allowing multiple versions of a function to exist.
	* Functions using this must also be added to zlib-ng.map for each version.
	* Double @@ means this is the default for newly compiled applications to link against.
	* Single @ means this is kept for backwards compatibility.
	* This is only used for Zlib-ng native API, and only on platforms supporting this.
	*/
	#if defined(HAVE_SYMVER)
	# define ZSYMVER(func,alias,ver) __asm__(".symver " func ", " alias "@ZLIB_NG_" ver);
	# define ZSYMVER_DEF(func,alias,ver) __asm__(".symver " func ", " alias "@@ZLIB_NG_" ver);
	#else
	# define ZSYMVER(func,alias,ver)
	# define ZSYMVER_DEF(func,alias,ver)
	#endif

	#ifndef __cplusplus
	# define Z_REGISTER register
	#else
	# define Z_REGISTER
	#endif

	#if defined(_MSC_VER)
	# define Z_RESTRICT __restrict
	#elif defined(__STDC_VERSION__) && __STDC_VERSION__ >= 199901L
	# define Z_RESTRICT restrict
	#else
	# define Z_RESTRICT __restrict__
	#endif

	/* Reverse the bytes in a value. Use compiler intrinsics when
	possible to take advantage of hardware implementations. */
	#if defined(_MSC_VER) && (_MSC_VER >= 1300)
	# include <stdlib.h>
	# pragma intrinsic(_byteswap_ulong)
	# define ZSWAP16(q) _byteswap_ushort(q)
	# define ZSWAP32(q) _byteswap_ulong(q)
	# define ZSWAP64(q) _byteswap_uint64(q)

	#elif defined(__clang__) \|\| (defined(__GNUC__) && \
	(__GNUC__ > 4 \|\| (__GNUC__ == 4 && __GNUC_MINOR__ >= 8)))
	# define ZSWAP16(q) __builtin_bswap16(q)
	# define ZSWAP32(q) __builtin_bswap32(q)
	# define ZSWAP64(q) __builtin_bswap64(q)

	#elif defined(__GNUC__) && (__GNUC__ >= 2) && defined(__linux__)
	# include <byteswap.h>
	# define ZSWAP16(q) bswap_16(q)
	# define ZSWAP32(q) bswap_32(q)
	# define ZSWAP64(q) bswap_64(q)

	#elif defined(__FreeBSD__) \|\| defined(__NetBSD__) \|\| defined(__DragonFly__)
	# include <sys/endian.h>
	# define ZSWAP16(q) bswap16(q)
	# define ZSWAP32(q) bswap32(q)
	# define ZSWAP64(q) bswap64(q)
	#elif defined(__OpenBSD__)
	# include <sys/endian.h>
	# define ZSWAP16(q) swap16(q)
	# define ZSWAP32(q) swap32(q)
	# define ZSWAP64(q) swap64(q)
	#elif defined(__INTEL_COMPILER)
	/* ICC does not provide a two byte swap. */
	# define ZSWAP16(q) ((((q) & 0xff) << 8) \| (((q) & 0xff00) >> 8))
	# define ZSWAP32(q) _bswap(q)
	# define ZSWAP64(q) _bswap64(q)

	#else
	# define ZSWAP16(q) ((((q) & 0xff) << 8) \| (((q) & 0xff00) >> 8))
	# define ZSWAP32(q) ((((q) >> 24) & 0xff) + (((q) >> 8) & 0xff00) + \
	(((q) & 0xff00) << 8) + (((q) & 0xff) << 24))
	# define ZSWAP64(q) \
	(((q & 0xFF00000000000000u) >> 56u) \| \
	((q & 0x00FF000000000000u) >> 40u) \| \
	((q & 0x0000FF0000000000u) >> 24u) \| \
	((q & 0x000000FF00000000u) >> 8u) \| \
	((q & 0x00000000FF000000u) << 8u) \| \
	((q & 0x0000000000FF0000u) << 24u) \| \
	((q & 0x000000000000FF00u) << 40u) \| \
	((q & 0x00000000000000FFu) << 56u))
	#endif

	/* Only enable likely/unlikely if the compiler is known to support it */
	#if (defined(__GNUC__) && (__GNUC__ >= 3)) \|\| defined(__INTEL_COMPILER) \|\| defined(__clang__)
	# define LIKELY_NULL(x) __builtin_expect((x) != 0, 0)
	# define LIKELY(x) __builtin_expect(!!(x), 1)
	# define UNLIKELY(x) __builtin_expect(!!(x), 0)
	#else
	# define LIKELY_NULL(x) x
	# define LIKELY(x) x
	# define UNLIKELY(x) x
	#endif /* (un)likely */

	#if defined(HAVE_ATTRIBUTE_ALIGNED)
	# define ALIGNED_(x) __attribute__ ((aligned(x)))
	#elif defined(_MSC_VER)
	# define ALIGNED_(x) __declspec(align(x))
	#else
	/* TODO: Define ALIGNED_ for your compiler */
	# define ALIGNED_(x)
	#endif

	#ifdef HAVE_BUILTIN_ASSUME_ALIGNED
	# define HINT_ALIGNED(p,n) __builtin_assume_aligned((void *)(p),(n))
	#else
	# define HINT_ALIGNED(p,n) (p)
	#endif
	#define HINT_ALIGNED_16(p) HINT_ALIGNED((p),16)
	#define HINT_ALIGNED_64(p) HINT_ALIGNED((p),64)
	#define HINT_ALIGNED_4096(p) HINT_ALIGNED((p),4096)

	/* Number of bytes needed to align ptr to the next alignment boundary */
	#define ALIGN_DIFF(ptr, align) \
	(((uintptr_t)(align) - ((uintptr_t)(ptr) & ((align) - 1))) & ((align) - 1))

	/* Round up value to the nearest multiple of align (align must be power of 2) */
	#define ALIGN_UP(value, align) \
	(((value) + ((align) - 1)) & ~((align) - 1))

	/* Round down value to the nearest multiple of align (align must be power of 2) */
	#define ALIGN_DOWN(value, align) \
	((value) & ~((align) - 1))

	/* PADSZ returns needed bytes to pad bpos to pad size
	* PAD_NN calculates pad size and adds it to bpos, returning the result.
	* All take an integer or a pointer as bpos input.
	*/
	#define PADSZ(bpos, pad) (((pad) - ((uintptr_t)(bpos) % (pad))) % (pad))
	#define PAD_16(bpos) ((bpos) + PADSZ((bpos),16))
	#define PAD_64(bpos) ((bpos) + PADSZ((bpos),64))
	#define PAD_4096(bpos) ((bpos) + PADSZ((bpos),4096))

	/* Diagnostic functions */
	#ifdef ZLIB_DEBUG
	extern int Z_INTERNAL z_verbose;
	extern void Z_INTERNAL z_error(const char *m);
	# define Assert(cond, msg) {int _cond = (cond); if (!(_cond)) z_error(msg);}
	# define Trace(x) {if (z_verbose >= 0) fprintf x;}
	# define Tracev(x) {if (z_verbose > 0) fprintf x;}
	# define Tracevv(x) {if (z_verbose > 1) fprintf x;}
	# define Tracec(c, x) {if (z_verbose > 0 && (c)) fprintf x;}
	# define Tracecv(c, x) {if (z_verbose > 1 && (c)) fprintf x;}
	#else
	# define Assert(cond, msg)
	# define Trace(x)
	# define Tracev(x)
	# define Tracevv(x)
	# define Tracec(c, x)
	# define Tracecv(c, x)
	#endif

	/* OPTIMAL_CMP values determine the comparison width:
	* 64: Best for 64-bit architectures with unaligned access
	* 32: Best for 32-bit architectures with unaligned access
	* 16: Safe default for unknown architectures
	* 8: Safe fallback for architectures without unaligned access
	* Note: The unaligned access mentioned is cpu-support, this allows compiler or
	* separate unaligned intrinsics to utilize safe unaligned access, without
	* utilizing unaligned C pointers that are known to have undefined behavior.
	*/
	#if !defined(OPTIMAL_CMP)
	# ifdef ARCH_64BIT
	# ifdef ARCH_ARM
	# if defined(__ARM_FEATURE_UNALIGNED) \|\| defined(_WIN32)
	# define OPTIMAL_CMP 64
	# else
	# define OPTIMAL_CMP 8
	# endif
	# else
	# define OPTIMAL_CMP 64
	# endif
	# elif defined(ARCH_32BIT)
	# ifdef ARCH_ARM
	# if defined(__ARM_FEATURE_UNALIGNED) \|\| defined(_WIN32)
	# define OPTIMAL_CMP 32
	# else
	# define OPTIMAL_CMP 8
	# endif
	# else
	# define OPTIMAL_CMP 32
	# endif
	# endif
	#endif
	#if !defined(OPTIMAL_CMP)
	# define OPTIMAL_CMP 16
	#endif

	#endif