127 lines
3.8 KiB
C++
127 lines
3.8 KiB
C++
/*
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* Copyright 2021, 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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#pragma once
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#include <array>
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#include <cstdint>
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namespace cuttlefish {
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namespace confui {
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namespace support {
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using auth_token_key_t = std::array<std::uint8_t, 32>;
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using hmac_t = auth_token_key_t;
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template <typename T>
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auto bytes_cast(const T& v) -> const uint8_t (&)[sizeof(T)] {
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return *reinterpret_cast<const uint8_t(*)[sizeof(T)]>(&v);
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}
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template <typename T>
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auto bytes_cast(T& v) -> uint8_t (&)[sizeof(T)] {
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return *reinterpret_cast<uint8_t(*)[sizeof(T)]>(&v);
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}
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template <typename IntType, uint32_t byteOrder>
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struct choose_hton;
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template <typename IntType>
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struct choose_hton<IntType, __ORDER_LITTLE_ENDIAN__> {
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inline static IntType hton(const IntType& value) {
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IntType result = {};
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const unsigned char* inbytes =
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reinterpret_cast<const unsigned char*>(&value);
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unsigned char* outbytes = reinterpret_cast<unsigned char*>(&result);
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for (int i = sizeof(IntType) - 1; i >= 0; --i) {
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*(outbytes++) = inbytes[i];
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}
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return result;
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}
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};
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template <typename IntType>
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struct choose_hton<IntType, __ORDER_BIG_ENDIAN__> {
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inline static IntType hton(const IntType& value) { return value; }
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};
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template <typename IntType>
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inline IntType hton(const IntType& value) {
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return choose_hton<IntType, __BYTE_ORDER__>::hton(value);
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}
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class ByteBufferProxy {
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template <typename T>
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struct has_data {
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template <typename U>
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static int f(const U*, const void*) {
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return 0;
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}
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template <typename U>
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static int* f(const U* u, decltype(u->data())) {
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return nullptr;
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}
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static constexpr bool value =
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std::is_pointer<decltype(f((T*)nullptr, ""))>::value;
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};
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public:
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template <typename T>
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ByteBufferProxy(const T& buffer, decltype(buffer.data()) = nullptr)
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: data_(reinterpret_cast<const uint8_t*>(buffer.data())),
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size_(buffer.size()) {
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static_assert(sizeof(decltype(*buffer.data())) == 1, "elements to large");
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}
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// this overload kicks in for types that have .c_str() but not .data(), such
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// as hidl_string. std::string has both so we need to explicitly disable this
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// overload if .data() is present.
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template <typename T>
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ByteBufferProxy(
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const T& buffer,
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std::enable_if_t<!has_data<T>::value, decltype(buffer.c_str())> = nullptr)
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: data_(reinterpret_cast<const uint8_t*>(buffer.c_str())),
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size_(buffer.size()) {
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static_assert(sizeof(decltype(*buffer.c_str())) == 1, "elements to large");
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}
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template <size_t size>
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ByteBufferProxy(const char (&buffer)[size])
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: data_(reinterpret_cast<const uint8_t*>(buffer)), size_(size - 1) {
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static_assert(size > 0, "even an empty string must be 0-terminated");
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}
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template <size_t size>
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ByteBufferProxy(const uint8_t (&buffer)[size]) : data_(buffer), size_(size) {}
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ByteBufferProxy() : data_(nullptr), size_(0) {}
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const uint8_t* data() const { return data_; }
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size_t size() const { return size_; }
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const uint8_t* begin() const { return data_; }
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const uint8_t* end() const { return data_ + size_; }
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private:
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const uint8_t* data_;
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size_t size_;
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};
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// copied from:
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// hardware/interface/confirmationui/support/include/android/hardware/confirmationui/support/confirmationui_utils.h
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} // end of namespace support
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} // end of namespace confui
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} // end of namespace cuttlefish
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