83 lines
2.4 KiB
C++
83 lines
2.4 KiB
C++
//
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// Copyright 2017 The Abseil Authors.
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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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// https://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 ABSL_BASE_INTERNAL_UNALIGNED_ACCESS_H_
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#define ABSL_BASE_INTERNAL_UNALIGNED_ACCESS_H_
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#include <string.h>
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#include <cstdint>
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#include "absl/base/attributes.h"
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#include "absl/base/config.h"
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// unaligned APIs
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// Portable handling of unaligned loads, stores, and copies.
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// The unaligned API is C++ only. The declarations use C++ features
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// (namespaces, inline) which are absent or incompatible in C.
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#if defined(__cplusplus)
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namespace absl {
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ABSL_NAMESPACE_BEGIN
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namespace base_internal {
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inline uint16_t UnalignedLoad16(const void *p) {
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uint16_t t;
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memcpy(&t, p, sizeof t);
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return t;
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}
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inline uint32_t UnalignedLoad32(const void *p) {
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uint32_t t;
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memcpy(&t, p, sizeof t);
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return t;
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}
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inline uint64_t UnalignedLoad64(const void *p) {
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uint64_t t;
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memcpy(&t, p, sizeof t);
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return t;
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}
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inline void UnalignedStore16(void *p, uint16_t v) { memcpy(p, &v, sizeof v); }
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inline void UnalignedStore32(void *p, uint32_t v) { memcpy(p, &v, sizeof v); }
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inline void UnalignedStore64(void *p, uint64_t v) { memcpy(p, &v, sizeof v); }
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} // namespace base_internal
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ABSL_NAMESPACE_END
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} // namespace absl
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#define ABSL_INTERNAL_UNALIGNED_LOAD16(_p) \
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(absl::base_internal::UnalignedLoad16(_p))
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#define ABSL_INTERNAL_UNALIGNED_LOAD32(_p) \
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(absl::base_internal::UnalignedLoad32(_p))
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#define ABSL_INTERNAL_UNALIGNED_LOAD64(_p) \
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(absl::base_internal::UnalignedLoad64(_p))
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#define ABSL_INTERNAL_UNALIGNED_STORE16(_p, _val) \
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(absl::base_internal::UnalignedStore16(_p, _val))
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#define ABSL_INTERNAL_UNALIGNED_STORE32(_p, _val) \
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(absl::base_internal::UnalignedStore32(_p, _val))
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#define ABSL_INTERNAL_UNALIGNED_STORE64(_p, _val) \
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(absl::base_internal::UnalignedStore64(_p, _val))
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#endif // defined(__cplusplus), end of unaligned API
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#endif // ABSL_BASE_INTERNAL_UNALIGNED_ACCESS_H_
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