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137 lines
4.0 KiB
137 lines
4.0 KiB
/*
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* Copyright (C) 2018 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef LIBTEXTCLASSIFIER_UTILS_BASE_ENDIAN_H_
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#define LIBTEXTCLASSIFIER_UTILS_BASE_ENDIAN_H_
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#include "utils/base/integral_types.h"
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namespace libtextclassifier3 {
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#if defined OS_LINUX || defined OS_CYGWIN || defined OS_ANDROID || \
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defined(__ANDROID__)
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#include <endian.h>
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#elif defined(__APPLE__)
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#include <machine/endian.h>
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// Add linux style defines.
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#ifndef __BYTE_ORDER
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#define __BYTE_ORDER BYTE_ORDER
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#endif // __BYTE_ORDER
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#ifndef __LITTLE_ENDIAN
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#define __LITTLE_ENDIAN LITTLE_ENDIAN
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#endif // __LITTLE_ENDIAN
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#ifndef __BIG_ENDIAN
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#define __BIG_ENDIAN BIG_ENDIAN
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#endif // __BIG_ENDIAN
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#endif
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// The following guarantees declaration of the byte swap functions, and
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// defines __BYTE_ORDER for MSVC
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#if defined(__GLIBC__) || defined(__BIONIC__) || defined(__CYGWIN__)
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#include <byteswap.h> // IWYU pragma: export
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// The following section defines the byte swap functions for OS X / iOS,
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// which does not ship with byteswap.h.
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#elif defined(__APPLE__)
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// Make sure that byte swap functions are not already defined.
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#if !defined(bswap_16)
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#include <libkern/OSByteOrder.h>
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#define bswap_16(x) OSSwapInt16(x)
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#define bswap_32(x) OSSwapInt32(x)
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#define bswap_64(x) OSSwapInt64(x)
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#endif // !defined(bswap_16)
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#else
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#define int64_t {x} x##LL
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#define uint64_t {x} x##ULL
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static inline uint16 bswap_16(uint16 x) {
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return (uint16)(((x & 0xFF) << 8) | ((x & 0xFF00) >> 8)); // NOLINT
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}
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#define bswap_16(x) bswap_16(x)
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static inline uint32 bswap_32(uint32 x) {
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return (((x & 0xFF) << 24) | ((x & 0xFF00) << 8) | ((x & 0xFF0000) >> 8) |
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((x & 0xFF000000) >> 24));
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}
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#define bswap_32(x) bswap_32(x)
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static inline uint64 bswap_64(uint64 x) {
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return (((x & uint64_t{0xFF}) << 56) | ((x & uint64_t{0xFF00}) << 40) |
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((x & uint64_t{0xFF0000}) << 24) | ((x & uint64_t{0xFF000000}) << 8) |
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((x & uint64_t{0xFF00000000}) >> 8) |
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((x & uint64_t{0xFF0000000000}) >> 24) |
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((x & uint64_t{0xFF000000000000}) >> 40) |
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((x & uint64_t{0xFF00000000000000}) >> 56));
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}
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#define bswap_64(x) bswap_64(x)
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#endif
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// define the macros IS_LITTLE_ENDIAN or IS_BIG_ENDIAN
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// using the above endian definitions from endian.h if
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// endian.h was included
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#ifdef __BYTE_ORDER
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#if __BYTE_ORDER == __LITTLE_ENDIAN
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#define IS_LITTLE_ENDIAN
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#endif
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#if __BYTE_ORDER == __BIG_ENDIAN
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#define IS_BIG_ENDIAN
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#endif
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#else
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#if defined(__LITTLE_ENDIAN__)
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#define IS_LITTLE_ENDIAN
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#elif defined(__BIG_ENDIAN__)
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#define IS_BIG_ENDIAN
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#endif
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// there is also PDP endian ...
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#endif // __BYTE_ORDER
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class LittleEndian {
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public:
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// Conversion functions.
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#ifdef IS_LITTLE_ENDIAN
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static uint16 FromHost16(uint16 x) { return x; }
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static uint16 ToHost16(uint16 x) { return x; }
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static uint32 FromHost32(uint32 x) { return x; }
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static uint32 ToHost32(uint32 x) { return x; }
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static uint64 FromHost64(uint64 x) { return x; }
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static uint64 ToHost64(uint64 x) { return x; }
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static bool IsLittleEndian() { return true; }
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#elif defined IS_BIG_ENDIAN
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static uint16 FromHost16(uint16 x) { return gbswap_16(x); }
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static uint16 ToHost16(uint16 x) { return gbswap_16(x); }
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static uint32 FromHost32(uint32 x) { return gbswap_32(x); }
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static uint32 ToHost32(uint32 x) { return gbswap_32(x); }
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static uint64 FromHost64(uint64 x) { return gbswap_64(x); }
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static uint64 ToHost64(uint64 x) { return gbswap_64(x); }
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static bool IsLittleEndian() { return false; }
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#endif /* ENDIAN */
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};
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} // namespace libtextclassifier3
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#endif // LIBTEXTCLASSIFIER_UTILS_BASE_ENDIAN_H_
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