/*
|
* Copyright (C) 2018 The Android Open Source Project
|
*
|
* Licensed 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.
|
*/
|
|
#ifndef LIBTEXTCLASSIFIER_UTILS_BASE_ENDIAN_H_
|
#define LIBTEXTCLASSIFIER_UTILS_BASE_ENDIAN_H_
|
|
#include "utils/base/integral_types.h"
|
|
namespace libtextclassifier3 {
|
|
#if defined OS_LINUX || defined OS_CYGWIN || defined OS_ANDROID || \
|
defined(__ANDROID__)
|
#include <endian.h>
|
#elif defined(__APPLE__)
|
#include <machine/endian.h>
|
// Add linux style defines.
|
#ifndef __BYTE_ORDER
|
#define __BYTE_ORDER BYTE_ORDER
|
#endif // __BYTE_ORDER
|
#ifndef __LITTLE_ENDIAN
|
#define __LITTLE_ENDIAN LITTLE_ENDIAN
|
#endif // __LITTLE_ENDIAN
|
#ifndef __BIG_ENDIAN
|
#define __BIG_ENDIAN BIG_ENDIAN
|
#endif // __BIG_ENDIAN
|
#endif
|
|
// The following guarantees declaration of the byte swap functions, and
|
// defines __BYTE_ORDER for MSVC
|
#if defined(__GLIBC__) || defined(__BIONIC__) || defined(__CYGWIN__)
|
#include <byteswap.h> // IWYU pragma: export
|
// The following section defines the byte swap functions for OS X / iOS,
|
// which does not ship with byteswap.h.
|
#elif defined(__APPLE__)
|
// Make sure that byte swap functions are not already defined.
|
#if !defined(bswap_16)
|
#include <libkern/OSByteOrder.h>
|
#define bswap_16(x) OSSwapInt16(x)
|
#define bswap_32(x) OSSwapInt32(x)
|
#define bswap_64(x) OSSwapInt64(x)
|
#endif // !defined(bswap_16)
|
#else
|
#define GG_LONGLONG(x) x##LL
|
#define GG_ULONGLONG(x) x##ULL
|
static inline uint16 bswap_16(uint16 x) {
|
return (uint16)(((x & 0xFF) << 8) | ((x & 0xFF00) >> 8)); // NOLINT
|
}
|
#define bswap_16(x) bswap_16(x)
|
static inline uint32 bswap_32(uint32 x) {
|
return (((x & 0xFF) << 24) | ((x & 0xFF00) << 8) | ((x & 0xFF0000) >> 8) |
|
((x & 0xFF000000) >> 24));
|
}
|
#define bswap_32(x) bswap_32(x)
|
static inline uint64 bswap_64(uint64 x) {
|
return (((x & GG_ULONGLONG(0xFF)) << 56) |
|
((x & GG_ULONGLONG(0xFF00)) << 40) |
|
((x & GG_ULONGLONG(0xFF0000)) << 24) |
|
((x & GG_ULONGLONG(0xFF000000)) << 8) |
|
((x & GG_ULONGLONG(0xFF00000000)) >> 8) |
|
((x & GG_ULONGLONG(0xFF0000000000)) >> 24) |
|
((x & GG_ULONGLONG(0xFF000000000000)) >> 40) |
|
((x & GG_ULONGLONG(0xFF00000000000000)) >> 56));
|
}
|
#define bswap_64(x) bswap_64(x)
|
#endif
|
|
// define the macros IS_LITTLE_ENDIAN or IS_BIG_ENDIAN
|
// using the above endian definitions from endian.h if
|
// endian.h was included
|
#ifdef __BYTE_ORDER
|
#if __BYTE_ORDER == __LITTLE_ENDIAN
|
#define IS_LITTLE_ENDIAN
|
#endif
|
|
#if __BYTE_ORDER == __BIG_ENDIAN
|
#define IS_BIG_ENDIAN
|
#endif
|
|
#else
|
|
#if defined(__LITTLE_ENDIAN__)
|
#define IS_LITTLE_ENDIAN
|
#elif defined(__BIG_ENDIAN__)
|
#define IS_BIG_ENDIAN
|
#endif
|
|
// there is also PDP endian ...
|
|
#endif // __BYTE_ORDER
|
|
class LittleEndian {
|
public:
|
// Conversion functions.
|
#ifdef IS_LITTLE_ENDIAN
|
|
static uint16 FromHost16(uint16 x) { return x; }
|
static uint16 ToHost16(uint16 x) { return x; }
|
|
static uint32 FromHost32(uint32 x) { return x; }
|
static uint32 ToHost32(uint32 x) { return x; }
|
|
static uint64 FromHost64(uint64 x) { return x; }
|
static uint64 ToHost64(uint64 x) { return x; }
|
|
static bool IsLittleEndian() { return true; }
|
|
#elif defined IS_BIG_ENDIAN
|
|
static uint16 FromHost16(uint16 x) { return gbswap_16(x); }
|
static uint16 ToHost16(uint16 x) { return gbswap_16(x); }
|
|
static uint32 FromHost32(uint32 x) { return gbswap_32(x); }
|
static uint32 ToHost32(uint32 x) { return gbswap_32(x); }
|
|
static uint64 FromHost64(uint64 x) { return gbswap_64(x); }
|
static uint64 ToHost64(uint64 x) { return gbswap_64(x); }
|
|
static bool IsLittleEndian() { return false; }
|
|
#endif /* ENDIAN */
|
};
|
|
} // namespace libtextclassifier3
|
|
#endif // LIBTEXTCLASSIFIER_UTILS_BASE_ENDIAN_H_
|
