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/*
This file is part of libmicrohttpd
Copyright (C) 2019 Karlson2k (Evgeny Grin)
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library.
If not, see <http://www.gnu.org/licenses/>.
*/
/**
* @file microhttpd/mhd_bithelpers.h
* @brief macros for bits manipulations
* @author Karlson2k (Evgeny Grin)
*/
#ifndef MHD_BITHELPERS_H
#define MHD_BITHELPERS_H 1
#include "mhd_byteorder.h"
#include <stdint.h>
#if defined(_MSC_FULL_VER) && (!defined(__clang__) || (defined(__c2__) && defined(__OPTIMIZE__)))
/* Declarations for VC & Clang/C2 built-ins */
#include <intrin.h>
#endif /* _MSC_FULL_VER */
#ifndef __has_builtin
/* Avoid precompiler errors with non-clang */
# define __has_builtin(x) 0
#endif
#ifdef MHD_HAVE___BUILTIN_BSWAP32
#define _MHD_BYTES_SWAP32(value32) \
((uint32_t)__builtin_bswap32((uint32_t)value32))
#elif defined(_MSC_FULL_VER) && (!defined(__clang__) || (defined(__c2__) && defined(__OPTIMIZE__)))
/* Clang/C2 may not inline this function if optimizations are turned off. */
#ifndef __clang__
#pragma intrinsic(_byteswap_ulong)
#endif /* ! __clang__ */
#define _MHD_BYTES_SWAP32(value32) \
((uint32_t)_byteswap_ulong((uint32_t)value32))
#elif __has_builtin(__builtin_bswap32)
#define _MHD_BYTES_SWAP32(value32) \
((uint32_t)__builtin_bswap32((uint32_t)value32))
#else /* ! __has_builtin(__builtin_bswap32) */
#define _MHD_BYTES_SWAP32(value32) \
( (((uint32_t)(value32)) << 24) | \
((((uint32_t)(value32)) & ((uint32_t)0x0000FF00)) << 8) | \
((((uint32_t)(value32)) & ((uint32_t)0x00FF0000)) >> 8) | \
(((uint32_t)(value32)) >> 24) )
#endif /* ! __has_builtin(__builtin_bswap32) */
#ifdef MHD_HAVE___BUILTIN_BSWAP64
#define _MHD_BYTES_SWAP64(value64) \
((uint64_t)__builtin_bswap64((uint64_t)value64))
#elif defined(_MSC_FULL_VER) && (!defined(__clang__) || (defined(__c2__) && defined(__OPTIMIZE__)))
/* Clang/C2 may not inline this function if optimizations are turned off. */
#ifndef __clang__
#pragma intrinsic(_byteswap_uint64)
#endif /* ! __clang__ */
#define _MHD_BYTES_SWAP64(value64) \
((uint64_t)_byteswap_uint64((uint64_t)value64))
#elif __has_builtin(__builtin_bswap64)
#define _MHD_BYTES_SWAP64(value64) \
((uint64_t)__builtin_bswap64((uint64_t)value64))
#else /* ! __has_builtin(__builtin_bswap64) */
#define _MHD_BYTES_SWAP64(value64) \
( (((uint64_t)(value64)) << 56) | \
((((uint64_t)(value64)) & ((uint64_t)0x000000000000FF00)) << 40) | \
((((uint64_t)(value64)) & ((uint64_t)0x0000000000FF0000)) << 24) | \
((((uint64_t)(value64)) & ((uint64_t)0x00000000FF000000)) << 8) | \
((((uint64_t)(value64)) & ((uint64_t)0x000000FF00000000)) >> 8) | \
((((uint64_t)(value64)) & ((uint64_t)0x0000FF0000000000)) >> 24) | \
((((uint64_t)(value64)) & ((uint64_t)0x00FF000000000000)) >> 40) | \
(((uint64_t)(value64)) >> 56) )
#endif /* ! __has_builtin(__builtin_bswap64) */
/* _MHD_PUT_64BIT_LE (addr, value64)
* put native-endian 64-bit value64 to addr
* in little-endian mode.
*/
#if _MHD_BYTE_ORDER == _MHD_LITTLE_ENDIAN
#define _MHD_PUT_64BIT_LE(addr, value64) \
((*(uint64_t*)(addr)) = (uint64_t)(value64))
#elif _MHD_BYTE_ORDER == _MHD_BIG_ENDIAN
#define _MHD_PUT_64BIT_LE(addr, value64) \
((*(uint64_t*)(addr)) = _MHD_BYTES_SWAP64(value64))
#else /* _MHD_BYTE_ORDER != _MHD_BIG_ENDIAN */
/* Endianess was not detected or non-standard like PDP-endian */
#define _MHD_PUT_64BIT_LE(addr, value64) do { \
((uint8_t*)(addr))[0] = (uint8_t)((uint64_t)(value64)); \
((uint8_t*)(addr))[1] = (uint8_t)(((uint64_t)(value64)) >> 8); \
((uint8_t*)(addr))[2] = (uint8_t)(((uint64_t)(value64)) >> 16); \
((uint8_t*)(addr))[3] = (uint8_t)(((uint64_t)(value64)) >> 24); \
((uint8_t*)(addr))[4] = (uint8_t)(((uint64_t)(value64)) >> 32); \
((uint8_t*)(addr))[5] = (uint8_t)(((uint64_t)(value64)) >> 40); \
((uint8_t*)(addr))[6] = (uint8_t)(((uint64_t)(value64)) >> 48); \
((uint8_t*)(addr))[7] = (uint8_t)(((uint64_t)(value64)) >> 56); \
} while (0)
#endif /* _MHD_BYTE_ORDER != _MHD_BIG_ENDIAN */
/* _MHD_PUT_32BIT_LE (addr, value32)
* put native-endian 32-bit value32 to addr
* in little-endian mode.
*/
#if _MHD_BYTE_ORDER == _MHD_LITTLE_ENDIAN
#define _MHD_PUT_32BIT_LE(addr,value32) \
((*(uint32_t*)(addr)) = (uint32_t)(value32))
#elif _MHD_BYTE_ORDER == _MHD_BIG_ENDIAN
#define _MHD_PUT_32BIT_LE(addr, value32) \
((*(uint32_t*)(addr)) = _MHD_BYTES_SWAP32(value32))
#else /* _MHD_BYTE_ORDER != _MHD_BIG_ENDIAN */
/* Endianess was not detected or non-standard like PDP-endian */
#define _MHD_PUT_32BIT_LE(addr, value32) do { \
((uint8_t*)(addr))[0] = (uint8_t)((uint32_t)(value32)); \
((uint8_t*)(addr))[1] = (uint8_t)(((uint32_t)(value32)) >> 8); \
((uint8_t*)(addr))[2] = (uint8_t)(((uint32_t)(value32)) >> 16); \
((uint8_t*)(addr))[3] = (uint8_t)(((uint32_t)(value32)) >> 24); \
} while (0)
#endif /* _MHD_BYTE_ORDER != _MHD_BIG_ENDIAN */
/* _MHD_GET_32BIT_LE (addr)
* get little-endian 32-bit value storied at addr
* and return it in native-endian mode.
*/
#if _MHD_BYTE_ORDER == _MHD_LITTLE_ENDIAN
#define _MHD_GET_32BIT_LE(addr) \
(*(const uint32_t*)(addr))
#elif _MHD_BYTE_ORDER == _MHD_BIG_ENDIAN
#define _MHD_GET_32BIT_LE(addr) \
_MHD_BYTES_SWAP32(*(const uint32_t*)(addr))
#else /* _MHD_BYTE_ORDER != _MHD_BIG_ENDIAN */
/* Endianess was not detected or non-standard like PDP-endian */
#define _MHD_GET_32BIT_LE(addr) \
( ( (uint32_t)(((const uint8_t*)addr)[0])) | \
(((uint32_t)(((const uint8_t*)addr)[1])) << 8) | \
(((uint32_t)(((const uint8_t*)addr)[2])) << 16) | \
(((uint32_t)(((const uint8_t*)addr)[3])) << 24) )
#endif /* _MHD_BYTE_ORDER != _MHD_BIG_ENDIAN */
/* _MHD_PUT_64BIT_BE (addr, value64)
* put native-endian 64-bit value64 to addr
* in big-endian mode.
*/
#if _MHD_BYTE_ORDER == _MHD_BIG_ENDIAN
#define _MHD_PUT_64BIT_BE(addr, value64) \
((*(uint64_t*)(addr)) = (uint64_t)(value64))
#elif _MHD_BYTE_ORDER == _MHD_LITTLE_ENDIAN
#define _MHD_PUT_64BIT_BE(addr, value64) \
((*(uint64_t*)(addr)) = _MHD_BYTES_SWAP64(value64))
#else /* _MHD_BYTE_ORDER != _MHD_LITTLE_ENDIAN */
/* Endianess was not detected or non-standard like PDP-endian */
#define _MHD_PUT_64BIT_BE(addr, value64) do { \
((uint8_t*)(addr))[7] = (uint8_t)((uint64_t)(value64)); \
((uint8_t*)(addr))[6] = (uint8_t)(((uint64_t)(value64)) >> 8); \
((uint8_t*)(addr))[5] = (uint8_t)(((uint64_t)(value64)) >> 16); \
((uint8_t*)(addr))[4] = (uint8_t)(((uint64_t)(value64)) >> 24); \
((uint8_t*)(addr))[3] = (uint8_t)(((uint64_t)(value64)) >> 32); \
((uint8_t*)(addr))[2] = (uint8_t)(((uint64_t)(value64)) >> 40); \
((uint8_t*)(addr))[1] = (uint8_t)(((uint64_t)(value64)) >> 48); \
((uint8_t*)(addr))[0] = (uint8_t)(((uint64_t)(value64)) >> 56); \
} while (0)
#endif /* _MHD_BYTE_ORDER != _MHD_LITTLE_ENDIAN */
/* _MHD_PUT_32BIT_BE (addr, value32)
* put native-endian 32-bit value32 to addr
* in big-endian mode.
*/
#if _MHD_BYTE_ORDER == _MHD_BIG_ENDIAN
#define _MHD_PUT_32BIT_BE(addr, value32) \
((*(uint32_t*)(addr)) = (uint32_t)(value32))
#elif _MHD_BYTE_ORDER == _MHD_LITTLE_ENDIAN
#define _MHD_PUT_32BIT_BE(addr, value32) \
((*(uint32_t*)(addr)) = _MHD_BYTES_SWAP32(value32))
#else /* _MHD_BYTE_ORDER != _MHD_LITTLE_ENDIAN */
/* Endianess was not detected or non-standard like PDP-endian */
#define _MHD_PUT_32BIT_BE(addr, value32) do { \
((uint8_t*)(addr))[3] = (uint8_t)((uint32_t)(value32)); \
((uint8_t*)(addr))[2] = (uint8_t)(((uint32_t)(value32)) >> 8); \
((uint8_t*)(addr))[1] = (uint8_t)(((uint32_t)(value32)) >> 16); \
((uint8_t*)(addr))[0] = (uint8_t)(((uint32_t)(value32)) >> 24); \
} while (0)
#endif /* _MHD_BYTE_ORDER != _MHD_LITTLE_ENDIAN */
/* _MHD_GET_32BIT_BE (addr)
* get big-endian 32-bit value storied at addr
* and return it in native-endian mode.
*/
#if _MHD_BYTE_ORDER == _MHD_BIG_ENDIAN
#define _MHD_GET_32BIT_BE(addr) \
(*(const uint32_t*)(addr))
#elif _MHD_BYTE_ORDER == _MHD_LITTLE_ENDIAN
#define _MHD_GET_32BIT_BE(addr) \
_MHD_BYTES_SWAP32(*(const uint32_t*)(addr))
#else /* _MHD_BYTE_ORDER != _MHD_LITTLE_ENDIAN */
/* Endianess was not detected or non-standard like PDP-endian */
#define _MHD_GET_32BIT_BE(addr) \
( (((uint32_t)(((const uint8_t*)addr)[0])) << 24) | \
(((uint32_t)(((const uint8_t*)addr)[1])) << 16) | \
(((uint32_t)(((const uint8_t*)addr)[2])) << 8) | \
((uint32_t) (((const uint8_t*)addr)[3])) )
#endif /* _MHD_BYTE_ORDER != _MHD_LITTLE_ENDIAN */
/**
* Rotate right 32-bit value by number of bits.
* bits parameter must be more than zero and must be less than 32.
*/
#if defined(_MSC_FULL_VER) && (!defined(__clang__) || (defined(__c2__) && defined(__OPTIMIZE__)))
/* Clang/C2 do not inline this function if optimizations are turned off. */
#ifndef __clang__
#pragma intrinsic(_rotr)
#endif /* ! __clang__ */
#define _MHD_ROTR32(value32, bits) \
((uint32_t)_rotr((uint32_t)(value32),(bits)))
#else /* ! _MSC_FULL_VER */
/* Defined in form which modern compiler could optimize. */
#define _MHD_ROTR32(value32, bits) \
(((uint32_t)(value32)) >> (bits) | ((uint32_t)(value32)) << (32 - bits))
#endif /* ! _MSC_FULL_VER */
#endif /* ! MHD_BITHELPERS_H */
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