blob: ea9e69a0a317752d56d617bd351e5d15ffcd10fa (
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
|
// Compression/HuffmanEncoder.h
#ifndef __COMPRESSION_HUFFMANENCODER_H
#define __COMPRESSION_HUFFMANENCODER_H
#include "../../../Common/Types.h"
namespace NCompression {
namespace NHuffman {
const int kNumBitsInLongestCode = 20;
struct CItem
{
UInt32 Freq;
UInt32 Code;
UInt32 Dad;
UInt32 Len;
};
class CEncoder
{
public:
UInt32 m_NumSymbols; // number of symbols in adwSymbol
CItem *m_Items;
UInt32 *m_Heap;
UInt32 m_HeapSize;
Byte *m_Depth;
const Byte *m_ExtraBits;
UInt32 m_ExtraBase;
UInt32 m_MaxLength;
UInt32 m_HeapLength;
UInt32 m_BitLenCounters[kNumBitsInLongestCode + 1];
UInt32 RemoveSmallest();
bool Smaller(int n, int m);
void DownHeap(UInt32 k);
void GenerateBitLen(UInt32 maxCode, UInt32 heapMax);
void GenerateCodes(UInt32 maxCode);
UInt32 m_BlockBitLength;
void Free();
public:
CEncoder();
~CEncoder();
bool Create(UInt32 numSymbols, const Byte *extraBits,
UInt32 extraBase, UInt32 maxLength);
void StartNewBlock();
void AddSymbol(UInt32 symbol) { m_Items[symbol].Freq++; }
void SetFreqs(const UInt32 *freqs);
void BuildTree(Byte *levels);
UInt32 GetBlockBitLength() const { return m_BlockBitLength; }
template <class TBitEncoder>
void CodeOneValue(TBitEncoder *bitEncoder, UInt32 symbol)
{ bitEncoder->WriteBits(m_Items[symbol].Code, m_Items[symbol].Len); }
};
}}
#endif
|
