74 lines
2.1 KiB
C++
74 lines
2.1 KiB
C++
/*
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* Copyright (C) 2023 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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namespace aidl::android::hardware::bluetooth::audio {
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class A2dpBits {
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const uint8_t* cdata_;
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uint8_t* data_;
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public:
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A2dpBits(const std::vector<uint8_t>& vector) : cdata_(vector.data()) {}
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A2dpBits(std::vector<uint8_t>& vector)
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: cdata_(vector.data()), data_(vector.data()) {}
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struct Range {
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const int first, len;
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constexpr Range(int first, int last)
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: first(first), len(last - first + 1) {}
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constexpr Range(int index) : first(index), len(1) {}
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};
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constexpr bool get(int bit) const {
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return (cdata_[bit >> 3] >> (7 - (bit & 7))) & 1;
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}
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constexpr unsigned get(const Range& range) const {
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unsigned v(0);
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for (int i = 0; i < range.len; i++)
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v |= get(range.first + i) << ((range.len - 1) - i);
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return v;
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}
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constexpr void set(int bit, int value = 1) {
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uint8_t m = 1 << (7 - (bit & 7));
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if (value)
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data_[bit >> 3] |= m;
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else
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data_[bit >> 3] &= ~m;
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}
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constexpr void set(const Range& range, int value) {
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for (int i = 0; i < range.len; i++)
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set(range.first + i, (value >> ((range.len - 1) - i)) & 1);
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}
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constexpr int find_active_bit(const Range& range) const {
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unsigned v = get(range);
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int i = 0;
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for (; i < range.len && ((v >> i) & 1) == 0; i++)
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;
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return i < range.len && (v ^ (1 << i)) == 0
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? range.first + (range.len - 1) - i
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: -1;
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}
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};
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} // namespace aidl::android::hardware::bluetooth::audio
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