blob: dfc2b0bbb1c3a822ef1b7e72cde4b5d568ce64d0 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
|
// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
// Note: ported from Chromium commit head: 43ddd7a
#ifndef BIT_READER_H_
#define BIT_READER_H_
#include <stdint.h>
#include <string>
#include "base/compiler_specific.h"
#include "base/macros.h"
#include "bit_reader_core.h"
namespace media {
class BitReader : private BitReaderCore::ByteStreamProvider {
public:
// Initialize the reader to start reading at |data|, |size| being size
// of |data| in bytes.
BitReader(const uint8_t* data, int size);
~BitReader() override;
template<typename T> bool ReadBits(int num_bits, T* out) {
return bit_reader_core_.ReadBits(num_bits, out);
}
bool ReadFlag(bool* flag) {
return bit_reader_core_.ReadFlag(flag);
}
// Read |num_bits| of binary data into |str|. |num_bits| must be a positive
// multiple of 8. This is not efficient for extracting large strings.
// If false is returned, |str| may not be valid.
bool ReadString(int num_bits, std::string* str);
bool SkipBits(int num_bits) {
return bit_reader_core_.SkipBits(num_bits);
}
int bits_available() const {
return initial_size_ * 8 - bits_read();
}
int bits_read() const {
return bit_reader_core_.bits_read();
}
private:
// BitReaderCore::ByteStreamProvider implementation.
int GetBytes(int max_n, const uint8_t** out) override;
// Total number of bytes that was initially passed to BitReader.
const int initial_size_;
// Pointer to the next unread byte in the stream.
const uint8_t* data_;
// Bytes left in the stream.
int bytes_left_;
BitReaderCore bit_reader_core_;
DISALLOW_COPY_AND_ASSIGN(BitReader);
};
} // namespace media
#endif // BIT_READER_H_
|
