/usr/local/lib64/python3.6/site-packages/pyarrow/include/arrow/util
Edit: /usr/local/lib64/python3.6/site-packages/pyarrow/include/arrow/util/endian.h (8071B)
// Licensed to the Apache Software Foundation (ASF) under one
// or more contributor license agreements. See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership. The ASF licenses this file
// to you under the Apache License, Version 2.0 (the
// "License"); you may not use this file except in compliance
// with the License. You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied. See the License for the
// specific language governing permissions and limitations
// under the License.
#pragma once
#ifdef _WIN32
#define ARROW_LITTLE_ENDIAN 1
#else
#if defined(__APPLE__) || defined(__FreeBSD__)
#include
// IWYU pragma: keep
#elif defined(sun) || defined(__sun)
#include // IWYU pragma: keep
#else
#include // IWYU pragma: keep
#endif
#
#ifndef __BYTE_ORDER__
#error "__BYTE_ORDER__ not defined"
#endif
#
#ifndef __ORDER_LITTLE_ENDIAN__
#error "__ORDER_LITTLE_ENDIAN__ not defined"
#endif
#
#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
#define ARROW_LITTLE_ENDIAN 1
#else
#define ARROW_LITTLE_ENDIAN 0
#endif
#endif
#if defined(_MSC_VER)
#include // IWYU pragma: keep
#define ARROW_BYTE_SWAP64 _byteswap_uint64
#define ARROW_BYTE_SWAP32 _byteswap_ulong
#else
#define ARROW_BYTE_SWAP64 __builtin_bswap64
#define ARROW_BYTE_SWAP32 __builtin_bswap32
#endif
#include
#include
#include "arrow/util/type_traits.h"
#include "arrow/util/ubsan.h"
namespace arrow {
namespace BitUtil {
//
// Byte-swap 16-bit, 32-bit and 64-bit values
//
// Swap the byte order (i.e. endianness)
static inline int64_t ByteSwap(int64_t value) { return ARROW_BYTE_SWAP64(value); }
static inline uint64_t ByteSwap(uint64_t value) {
return static_cast(ARROW_BYTE_SWAP64(value));
}
static inline int32_t ByteSwap(int32_t value) { return ARROW_BYTE_SWAP32(value); }
static inline uint32_t ByteSwap(uint32_t value) {
return static_cast(ARROW_BYTE_SWAP32(value));
}
static inline int16_t ByteSwap(int16_t value) {
constexpr auto m = static_cast(0xff);
return static_cast(((value >> 8) & m) | ((value & m) << 8));
}
static inline uint16_t ByteSwap(uint16_t value) {
return static_cast(ByteSwap(static_cast(value)));
}
static inline uint8_t ByteSwap(uint8_t value) { return value; }
static inline int8_t ByteSwap(int8_t value) { return value; }
static inline double ByteSwap(double value) {
const uint64_t swapped = ARROW_BYTE_SWAP64(util::SafeCopy(value));
return util::SafeCopy(swapped);
}
static inline float ByteSwap(float value) {
const uint32_t swapped = ARROW_BYTE_SWAP32(util::SafeCopy(value));
return util::SafeCopy(swapped);
}
// Write the swapped bytes into dst. Src and dst cannot overlap.
static inline void ByteSwap(void* dst, const void* src, int len) {
switch (len) {
case 1:
*reinterpret_cast(dst) = *reinterpret_cast(src);
return;
case 2:
*reinterpret_cast(dst) = ByteSwap(*reinterpret_cast(src));
return;
case 4:
*reinterpret_cast(dst) = ByteSwap(*reinterpret_cast(src));
return;
case 8:
*reinterpret_cast(dst) = ByteSwap(*reinterpret_cast(src));
return;
default:
break;
}
auto d = reinterpret_cast(dst);
auto s = reinterpret_cast(src);
for (int i = 0; i < len; ++i) {
d[i] = s[len - i - 1];
}
}
// Convert to little/big endian format from the machine's native endian format.
#if ARROW_LITTLE_ENDIAN
template >
static inline T ToBigEndian(T value) {
return ByteSwap(value);
}
template >
static inline T ToLittleEndian(T value) {
return value;
}
#else
template >
static inline T ToBigEndian(T value) {
return value;
}
template >
static inline T ToLittleEndian(T value) {
return ByteSwap(value);
}
#endif
// Convert from big/little endian format to the machine's native endian format.
#if ARROW_LITTLE_ENDIAN
template >
static inline T FromBigEndian(T value) {
return ByteSwap(value);
}
template >
static inline T FromLittleEndian(T value) {
return value;
}
#else
template >
static inline T FromBigEndian(T value) {
return value;
}
template >
static inline T FromLittleEndian(T value) {
return ByteSwap(value);
}
#endif
// Handle endianness in *word* granuality (keep individual array element untouched)
namespace LittleEndianArray {
namespace detail {
// Read a native endian array as little endian
template
struct Reader {
const std::array& native_array;
explicit Reader(const std::array& native_array) : native_array(native_array) {}
const T& operator[](size_t i) const {
return native_array[ARROW_LITTLE_ENDIAN ? i : N - 1 - i];
}
};
// Read/write a native endian array as little endian
template
struct Writer {
std::array* native_array;
explicit Writer(std::array* native_array) : native_array(native_array) {}
const T& operator[](size_t i) const {
return (*native_array)[ARROW_LITTLE_ENDIAN ? i : N - 1 - i];
}
T& operator[](size_t i) { return (*native_array)[ARROW_LITTLE_ENDIAN ? i : N - 1 - i]; }
};
} // namespace detail
// Construct array reader and try to deduce template augments
template
static inline detail::Reader Make(const std::array& native_array) {
return detail::Reader(native_array);
}
// Construct array writer and try to deduce template augments
template
static inline detail::Writer Make(std::array* native_array) {
return detail::Writer(native_array);
}
// Convert little endian array to native endian
template
static inline std::array ToNative(std::array array) {
if (!ARROW_LITTLE_ENDIAN) {
std::reverse(array.begin(), array.end());
}
return array;
}
// Convert native endian array to little endian
template
static inline std::array FromNative(std::array array) {
return ToNative(array);
}
} // namespace LittleEndianArray
} // namespace BitUtil
} // namespace arrow