1/*
2 * Copyright (C) 2010 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17#ifndef A_BIT_READER_H_
18
19#define A_BIT_READER_H_
20
21#include <media/stagefright/foundation/ABase.h>
22
23#include <sys/types.h>
24#include <stdint.h>
25
26namespace android {
27
28struct ABitReader {
29    ABitReader(const uint8_t *data, size_t size);
30
31    uint32_t getBits(size_t n);
32    void skipBits(size_t n);
33
34    void putBits(uint32_t x, size_t n);
35
36    size_t numBitsLeft() const;
37
38    const uint8_t *data() const;
39
40private:
41    const uint8_t *mData;
42    size_t mSize;
43
44    uint32_t mReservoir;  // left-aligned bits
45    size_t mNumBitsLeft;
46
47    void fillReservoir();
48
49    DISALLOW_EVIL_CONSTRUCTORS(ABitReader);
50};
51
52}  // namespace android
53
54#endif  // A_BIT_READER_H_
55