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