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58 lines
1.6 KiB
58 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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