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57 lines
1.6 KiB
57 lines
1.6 KiB
/* |
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* Copyright 2015, 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 ANDROID_AUDIO_BIT_FIELD_PARSER_H |
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#define ANDROID_AUDIO_BIT_FIELD_PARSER_H |
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#include <stdint.h> |
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namespace android { |
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/** |
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* Extract bit fields from a byte array. |
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*/ |
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class BitFieldParser { |
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public: |
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explicit BitFieldParser(uint8_t *data); |
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virtual ~BitFieldParser(); |
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/** |
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* Read numBits bits from the data array. |
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* Fields may span byte boundaries but may not exceed 32-bits. |
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* Note that the caller must ensure that there is suffcient data. |
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* Assume data is organized as BigEndian format. |
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*/ |
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uint32_t readBits(uint32_t numBits); |
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/* |
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* When the cursor is zero it points to a position right before |
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* the most significant bit. |
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* When the cursor is seven it points to a position right before |
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* the least significant bit. |
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*/ |
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uint32_t getBitCursor() const { return mBitCursor; } |
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private: |
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uint8_t *mData; |
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uint32_t mBitCursor; |
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}; |
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} // namespace android |
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#endif // ANDROID_AUDIO_BIT_FIELD_PARSER_H
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