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/* Copyright 2014 MongoDB Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License, version 3,
* as published by the Free Software Foundation.
*
* This program 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* As a special exception, the copyright holders give permission to link the
* code of portions of this program with the OpenSSL library under certain
* conditions as described in each individual source file and distribute
* linked combinations including the program with the OpenSSL library. You
* must comply with the GNU Affero General Public License in all respects
* for all of the code used other than as permitted herein. If you modify
* file(s) with this exception, you may extend this exception to your
* version of the file(s), but you are not obligated to do so. If you do not
* wish to do so, delete this exception statement from your version. If you
* delete this exception statement from all source files in the program,
* then also delete it in the license file.
*/
#pragma once
#include <climits>
#include <cstring>
#include <boost/static_assert.hpp>
#include <boost/mpl/if.hpp>
#include <boost/type_traits/is_signed.hpp>
#include "mongo/platform/cstdint.h"
#pragma push_macro("MONGO_UINT16_SWAB")
#pragma push_macro("MONGO_UINT32_SWAB")
#pragma push_macro("MONGO_UINT64_SWAB")
#pragma push_macro("MONGO_LITTLE_ENDIAN")
#pragma push_macro("MONGO_BIG_ENDIAN")
#pragma push_macro("htobe16")
#pragma push_macro("htobe32")
#pragma push_macro("htobe64")
#pragma push_macro("htole16")
#pragma push_macro("htole32")
#pragma push_macro("htole64")
#pragma push_macro("be16toh")
#pragma push_macro("be32toh")
#pragma push_macro("be64toh")
#pragma push_macro("le16toh")
#pragma push_macro("le32toh")
#pragma push_macro("le64toh")
#undef MONGO_UINT16_SWAB
#undef MONGO_UINT32_SWAB
#undef MONGO_UINT64_SWAB
#undef MONGO_LITTLE_ENDIAN
#undef MONGO_BIG_ENDIAN
#undef htobe16
#undef htobe32
#undef htobe64
#undef htole16
#undef htole32
#undef htole64
#undef be16toh
#undef be32toh
#undef be64toh
#undef le16toh
#undef le32toh
#undef le64toh
#define MONGO_LITTLE_ENDIAN 1234
#define MONGO_BIG_ENDIAN 4321
#if defined(_MSC_VER) && (_MSC_VER >= 1300)
# include <cstdlib>
# define MONGO_UINT16_SWAB(v) _byteswap_ushort(v)
# define MONGO_UINT32_SWAB(v) _byteswap_ulong(v)
# define MONGO_UINT64_SWAB(v) _byteswap_uint64(v)
#elif defined(__clang__) && defined(__clang_major__) && defined(__clang_minor__) && \
(__clang_major__ >= 3) && (__clang_minor__ >= 1)
# if __has_builtin(__builtin_bswap16)
# define MONGO_UINT16_SWAB(v) __builtin_bswap16(v)
# endif
# if __has_builtin(__builtin_bswap32)
# define MONGO_UINT32_SWAB(v) __builtin_bswap32(v)
# endif
# if __has_builtin(__builtin_bswap64)
# define MONGO_UINT64_SWAB(v) __builtin_bswap64(v)
# endif
#elif defined(__GNUC__) && (__GNUC__ >= 4)
# if __GNUC__ >= 4 && defined (__GNUC_MINOR__) && __GNUC_MINOR__ >= 3
# define MONGO_UINT32_SWAB(v) __builtin_bswap32(v)
# define MONGO_UINT64_SWAB(v) __builtin_bswap64(v)
# endif
# if __GNUC__ >= 4 && defined (__GNUC_MINOR__) && __GNUC_MINOR__ >= 8
# define MONGO_UINT16_SWAB(v) __builtin_bswap16(v)
# endif
#elif defined(__sun)
# include <sys/byteorder.h>
# define MONGO_UINT16_SWAB(v) BSWAP_16(v)
# define MONGO_UINT32_SWAB(v) BSWAP_32(v)
# define MONGO_UINT64_SWAB(v) BSWAP_64(v)
#endif
#ifndef MONGO_UINT16_SWAB
# define MONGO_UINT16_SWAB(v) endian::bswap_slow16(v)
#endif
#ifndef MONGO_UINT32_SWAB
# define MONGO_UINT32_SWAB(v) endian::bswap_slow32(v)
#endif
#ifndef MONGO_UINT64_SWAB
# define MONGO_UINT64_SWAB(v) endian::bswap_slow64(v)
#endif
#if MONGO_BYTE_ORDER == MONGO_LITTLE_ENDIAN
# define htobe16(v) MONGO_UINT16_SWAB(v)
# define htobe32(v) MONGO_UINT32_SWAB(v)
# define htobe64(v) MONGO_UINT64_SWAB(v)
# define htole16(v) (v)
# define htole32(v) (v)
# define htole64(v) (v)
# define be16toh(v) MONGO_UINT16_SWAB(v)
# define be32toh(v) MONGO_UINT32_SWAB(v)
# define be64toh(v) MONGO_UINT64_SWAB(v)
# define le16toh(v) (v)
# define le32toh(v) (v)
# define le64toh(v) (v)
#elif MONGO_BYTE_ORDER == MONGO_BIG_ENDIAN
# define htobe16(v) (v)
# define htobe32(v) (v)
# define htobe64(v) (v)
# define htole16(v) MONGO_UINT16_SWAB(v)
# define htole32(v) MONGO_UINT32_SWAB(v)
# define htole64(v) MONGO_UINT64_SWAB(v)
# define be16toh(v) (v)
# define be32toh(v) (v)
# define be64toh(v) (v)
# define le16toh(v) MONGO_UINT16_SWAB(v)
# define le32toh(v) MONGO_UINT32_SWAB(v)
# define le64toh(v) MONGO_UINT64_SWAB(v)
#else
# error "The endianness of target architecture is unknown. " \
"Please define MONGO_BYTE_ORDER"
#endif
namespace mongo {
namespace endian {
static inline uint16_t bswap_slow16(uint16_t v) {
return ((v & 0x00FF) << 8) |
((v & 0xFF00) >> 8);
}
static inline uint32_t bswap_slow32(uint32_t v) {
return ((v & 0x000000FFUL) << 24) |
((v & 0x0000FF00UL) << 8) |
((v & 0x00FF0000UL) >> 8) |
((v & 0xFF000000UL) >> 24);
}
static inline uint64_t bswap_slow64(uint64_t v) {
return ((v & 0x00000000000000FFULL) << 56) |
((v & 0x000000000000FF00ULL) << 40) |
((v & 0x0000000000FF0000ULL) << 24) |
((v & 0x00000000FF000000ULL) << 8) |
((v & 0x000000FF00000000ULL) >> 8) |
((v & 0x0000FF0000000000ULL) >> 24) |
((v & 0x00FF000000000000ULL) >> 40) |
((v & 0xFF00000000000000ULL) >> 56);
}
template<typename T>
struct ByteOrderConverter;
template<>
struct ByteOrderConverter<uint8_t> {
typedef uint8_t T;
inline static T nativeToBig(T t) {
return t;
}
inline static T bigToNative(T t) {
return t;
}
inline static T nativeToLittle(T t) {
return t;
}
inline static T littleToNative(T t) {
return t;
}
};
template<>
struct ByteOrderConverter<uint16_t> {
typedef uint16_t T;
inline static T nativeToBig(T t) {
return htobe16(t);
}
inline static T bigToNative(T t) {
return be16toh(t);
}
inline static T nativeToLittle(T t) {
return htole16(t);
}
inline static T littleToNative(T t) {
return le16toh(t);
}
};
template<>
struct ByteOrderConverter<uint32_t> {
typedef uint32_t T;
inline static T nativeToBig(T t) {
return htobe32(t);
}
inline static T bigToNative(T t) {
return be32toh(t);
}
inline static T nativeToLittle(T t) {
return htole32(t);
}
inline static T littleToNative(T t) {
return le32toh(t);
}
};
template<>
struct ByteOrderConverter<uint64_t> {
typedef uint64_t T;
inline static T nativeToBig(T t) {
return htobe64(t);
}
inline static T bigToNative(T t) {
return be64toh(t);
}
inline static T nativeToLittle(T t) {
return htole64(t);
}
inline static T littleToNative(T t) {
return le64toh(t);
}
};
template<>
struct ByteOrderConverter<int8_t> {
typedef int8_t T;
inline static T nativeToBig(T t) {
return t;
}
inline static T bigToNative(T t) {
return t;
}
inline static T nativeToLittle(T t) {
return t;
}
inline static T littleToNative(T t) {
return t;
}
};
template<>
struct ByteOrderConverter<int16_t> {
typedef int16_t T;
inline static T nativeToBig(T t) {
return htobe16(static_cast<uint16_t>(t));
}
inline static T bigToNative(T t) {
return be16toh(static_cast<uint16_t>(t));
}
inline static T nativeToLittle(T t) {
return htole16(static_cast<uint16_t>(t));
}
inline static T littleToNative(T t) {
return le16toh(static_cast<uint16_t>(t));
}
};
template<>
struct ByteOrderConverter<int32_t> {
typedef int32_t T;
inline static T nativeToBig(T t) {
return htobe32(static_cast<uint32_t>(t));
}
inline static T bigToNative(T t) {
return be32toh(static_cast<uint32_t>(t));
}
inline static T nativeToLittle(T t) {
return htole32(static_cast<uint32_t>(t));
}
inline static T littleToNative(T t) {
return le32toh(static_cast<uint32_t>(t));
}
};
template<>
struct ByteOrderConverter<int64_t> {
typedef int64_t T;
inline static T nativeToBig(T t) {
return htobe64(static_cast<uint64_t>(t));
}
inline static T bigToNative(T t) {
return be64toh(static_cast<uint64_t>(t));
}
inline static T nativeToLittle(T t) {
return htole64(static_cast<uint64_t>(t));
}
inline static T littleToNative(T t) {
return le64toh(static_cast<uint64_t>(t));
}
};
template<>
struct ByteOrderConverter<float> {
typedef float T;
inline static T nativeToBig(T t) {
BOOST_STATIC_ASSERT(sizeof(T) == sizeof(uint32_t));
uint32_t temp;
std::memcpy(&temp, &t, sizeof(t));
temp = htobe32(temp);
std::memcpy(&t, &temp, sizeof(t));
return t;
}
inline static T bigToNative(T t) {
uint32_t temp;
std::memcpy(&temp, &t, sizeof(t));
temp = be32toh(temp);
std::memcpy(&t, &temp, sizeof(t));
return t;
}
inline static T nativeToLittle(T t) {
uint32_t temp;
std::memcpy(&temp, &t, sizeof(t));
temp = htole32(temp);
std::memcpy(&t, &temp, sizeof(t));
return t;
}
inline static T littleToNative(T t) {
uint32_t temp;
std::memcpy(&temp, &t, sizeof(t));
temp = le32toh(temp);
std::memcpy(&t, &temp, sizeof(t));
return t;
}
};
template<>
struct ByteOrderConverter<double> {
typedef double T;
inline static T nativeToBig(T t) {
BOOST_STATIC_ASSERT(sizeof(T) == sizeof(uint64_t));
uint64_t temp;
std::memcpy(&temp, &t, sizeof(t));
temp = htobe64(temp);
std::memcpy(&t, &temp, sizeof(t));
return t;
}
inline static T bigToNative(T t) {
uint64_t temp;
std::memcpy(&temp, &t, sizeof(t));
temp = be64toh(temp);
std::memcpy(&t, &temp, sizeof(t));
return t;
}
inline static T nativeToLittle(T t) {
uint64_t temp;
std::memcpy(&temp, &t, sizeof(t));
temp = htole64(temp);
std::memcpy(&t, &temp, sizeof(t));
return t;
}
inline static T littleToNative(T t) {
uint64_t temp;
std::memcpy(&temp, &t, sizeof(t));
temp = le64toh(temp);
std::memcpy(&t, &temp, sizeof(t));
return t;
}
};
// Use a typemape to normalize non-fixed-width integral types to the associated fixed width
// types.
template<typename T>
struct IntegralTypeMap {
typedef T type;
};
template<>
struct IntegralTypeMap<signed char> {
BOOST_STATIC_ASSERT(CHAR_BIT == 8);
typedef int8_t type;
};
template<>
struct IntegralTypeMap<unsigned char> {
BOOST_STATIC_ASSERT(CHAR_BIT == 8);
typedef uint8_t type;
};
template<>
struct IntegralTypeMap<char> {
BOOST_STATIC_ASSERT(CHAR_BIT == 8);
typedef boost::mpl::if_c<
boost::is_signed<char>::value,
int8_t,
uint8_t>::type type;
};
template<>
struct IntegralTypeMap<long long> {
BOOST_STATIC_ASSERT(sizeof(long long) == sizeof(int64_t));
typedef int64_t type;
};
template<>
struct IntegralTypeMap<unsigned long long> {
BOOST_STATIC_ASSERT(sizeof(unsigned long long) == sizeof(uint64_t));
typedef uint64_t type;
};
template<typename T>
inline T nativeToBig(T t) {
return ByteOrderConverter<typename IntegralTypeMap<T>::type>::nativeToBig(t);
}
template<typename T>
inline T bigToNative(T t) {
return ByteOrderConverter<typename IntegralTypeMap<T>::type>::bigToNative(t);
}
template<typename T>
inline T nativeToLittle(T t) {
return ByteOrderConverter<typename IntegralTypeMap<T>::type>::nativeToLittle(t);
}
template<typename T>
inline T littleToNative(T t) {
return ByteOrderConverter<typename IntegralTypeMap<T>::type>::littleToNative(t);
}
} // namespace endian
} // namespace mongo
#undef MONGO_UINT16_SWAB
#undef MONGO_UINT32_SWAB
#undef MONGO_UINT64_SWAB
#undef MONGO_LITTLE_ENDIAN
#undef MONGO_BIG_ENDIAN
#undef htobe16
#undef htobe32
#undef htobe64
#undef htole16
#undef htole32
#undef htole64
#undef be16toh
#undef be32toh
#undef be64toh
#undef le16toh
#undef le32toh
#undef le64toh
#pragma pop_macro("MONGO_UINT16_SWAB")
#pragma pop_macro("MONGO_UINT32_SWAB")
#pragma pop_macro("MONGO_UINT64_SWAB")
#pragma pop_macro("MONGO_LITTLE_ENDIAN")
#pragma pop_macro("MONGO_BIG_ENDIAN")
#pragma pop_macro("htobe16")
#pragma pop_macro("htobe32")
#pragma pop_macro("htobe64")
#pragma pop_macro("htole16")
#pragma pop_macro("htole32")
#pragma pop_macro("htole64")
#pragma pop_macro("be16toh")
#pragma pop_macro("be32toh")
#pragma pop_macro("be64toh")
#pragma pop_macro("le16toh")
#pragma pop_macro("le32toh")
#pragma pop_macro("le64toh")
|
