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
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
|
// QuantumDecoder.h
#ifndef __COMPRESS_QUANTUM_DECODER_H
#define __COMPRESS_QUANTUM_DECODER_H
#include "../../Common/MyCom.h"
#include "../ICoder.h"
#include "../Common/InBuffer.h"
#include "LzOutWindow.h"
namespace NCompress {
namespace NQuantum {
class CStreamBitDecoder
{
UInt32 Value;
CInBuffer Stream;
public:
bool Create(UInt32 bufferSize) { return Stream.Create(bufferSize); }
void SetStream(ISequentialInStream *stream) { Stream.SetStream(stream); }
void ReleaseStream() { Stream.ReleaseStream(); }
void Finish() { Value = 0x10000; }
void Init()
{
Stream.Init();
Value = 0x10000;
}
UInt64 GetProcessedSize() const { return Stream.GetProcessedSize(); }
bool WasFinished() const { return Stream.WasFinished(); }
UInt32 ReadBit()
{
if (Value >= 0x10000)
Value = 0x100 | Stream.ReadByte();
UInt32 res = (Value >> 7) & 1;
Value <<= 1;
return res;
}
UInt32 ReadBits(int numBits) // numBits > 0
{
UInt32 res = 0;
do
res = (res << 1) | ReadBit();
while (--numBits != 0);
return res;
}
};
const unsigned kNumLitSelectorBits = 2;
const unsigned kNumLitSelectors = (1 << kNumLitSelectorBits);
const unsigned kNumLitSymbols = 1 << (8 - kNumLitSelectorBits);
const unsigned kNumMatchSelectors = 3;
const unsigned kNumSelectors = kNumLitSelectors + kNumMatchSelectors;
const unsigned kNumSymbolsMax = kNumLitSymbols; // 64
namespace NRangeCoder {
class CDecoder
{
UInt32 Low;
UInt32 Range;
UInt32 Code;
public:
CStreamBitDecoder Stream;
bool Create(UInt32 bufferSize) { return Stream.Create(bufferSize); }
void SetStream(ISequentialInStream *stream) { Stream.SetStream(stream); }
void ReleaseStream() { Stream.ReleaseStream(); }
void Init()
{
Stream.Init();
Low = 0;
Range = 0x10000;
Code = Stream.ReadBits(16);
}
void Finish()
{
// we need these extra two Bit_reads
Stream.ReadBit();
Stream.ReadBit();
Stream.Finish();
}
UInt64 GetProcessedSize() const { return Stream.GetProcessedSize(); }
UInt32 GetThreshold(UInt32 total) const
{
return ((Code + 1) * total - 1) / Range; // & 0xFFFF is not required;
}
void Decode(UInt32 start, UInt32 end, UInt32 total)
{
UInt32 high = Low + end * Range / total - 1;
UInt32 offset = start * Range / total;
Code -= offset;
Low += offset;
for (;;)
{
if ((Low & 0x8000) != (high & 0x8000))
{
if ((Low & 0x4000) == 0 || (high & 0x4000) != 0)
break;
Low &= 0x3FFF;
high |= 0x4000;
}
Low = (Low << 1) & 0xFFFF;
high = ((high << 1) | 1) & 0xFFFF;
Code = ((Code << 1) | Stream.ReadBit());
}
Range = high - Low + 1;
}
};
const UInt16 kUpdateStep = 8;
const UInt16 kFreqSumMax = 3800;
const UInt16 kReorderCountStart = 4;
const UInt16 kReorderCount = 50;
class CModelDecoder
{
unsigned NumItems;
unsigned ReorderCount;
UInt16 Freqs[kNumSymbolsMax + 1];
Byte Values[kNumSymbolsMax];
public:
void Init(unsigned numItems)
{
NumItems = numItems;
ReorderCount = kReorderCountStart;
for (unsigned i = 0; i < numItems; i++)
{
Freqs[i] = (UInt16)(numItems - i);
Values[i] = (Byte)i;
}
Freqs[numItems] = 0;
}
unsigned Decode(CDecoder *rangeDecoder)
{
UInt32 threshold = rangeDecoder->GetThreshold(Freqs[0]);
unsigned i;
for (i = 1; Freqs[i] > threshold; i++);
rangeDecoder->Decode(Freqs[i], Freqs[i - 1], Freqs[0]);
unsigned res = Values[--i];
do
Freqs[i] += kUpdateStep;
while (i-- != 0);
if (Freqs[0] > kFreqSumMax)
{
if (--ReorderCount == 0)
{
ReorderCount = kReorderCount;
for (i = 0; i < NumItems; i++)
Freqs[i] = (UInt16)(((Freqs[i] - Freqs[i + 1]) + 1) >> 1);
for (i = 0; i < NumItems - 1; i++)
for (unsigned j = i + 1; j < NumItems; j++)
if (Freqs[i] < Freqs[j])
{
UInt16 tmpFreq = Freqs[i];
Byte tmpVal = Values[i];
Freqs[i] = Freqs[j];
Values[i] = Values[j];
Freqs[j] = tmpFreq;
Values[j] = tmpVal;
}
do
Freqs[i] = (UInt16)(Freqs[i] + Freqs[i + 1]);
while (i-- != 0);
}
else
{
i = NumItems - 1;
do
{
Freqs[i] >>= 1;
if (Freqs[i] <= Freqs[i + 1])
Freqs[i] = (UInt16)(Freqs[i + 1] + 1);
}
while (i-- != 0);
}
}
return res;
}
};
}
class CDecoder:
public ICompressCoder,
public ICompressSetInStream,
public ICompressSetOutStreamSize,
public CMyUnknownImp
{
CLzOutWindow _outWindowStream;
NRangeCoder::CDecoder _rangeDecoder;
UInt64 _outSize;
int _remainLen; // -1 means end of stream. // -2 means need Init
UInt32 _rep0;
int _numDictBits;
bool _keepHistory;
NRangeCoder::CModelDecoder m_Selector;
NRangeCoder::CModelDecoder m_Literals[kNumLitSelectors];
NRangeCoder::CModelDecoder m_PosSlot[kNumMatchSelectors];
NRangeCoder::CModelDecoder m_LenSlot;
void Init();
HRESULT CodeSpec(UInt32 size);
public:
MY_UNKNOWN_IMP2(
ICompressSetInStream,
ICompressSetOutStreamSize)
void ReleaseStreams()
{
_outWindowStream.ReleaseStream();
ReleaseInStream();
}
class CDecoderFlusher
{
CDecoder *_decoder;
public:
bool NeedFlush;
CDecoderFlusher(CDecoder *decoder): _decoder(decoder), NeedFlush(true) {}
~CDecoderFlusher()
{
if (NeedFlush)
_decoder->Flush();
_decoder->ReleaseStreams();
}
};
HRESULT Flush() { return _outWindowStream.Flush(); }
HRESULT CodeReal(ISequentialInStream *inStream, ISequentialOutStream *outStream,
const UInt64 *inSize, const UInt64 *outSize, ICompressProgressInfo *progress);
STDMETHOD(Code)(ISequentialInStream *inStream, ISequentialOutStream *outStream,
const UInt64 *inSize, const UInt64 *outSize, ICompressProgressInfo *progress);
STDMETHOD(SetInStream)(ISequentialInStream *inStream);
STDMETHOD(ReleaseInStream)();
STDMETHOD(SetOutStreamSize)(const UInt64 *outSize);
void SetParams(int numDictBits) { _numDictBits = numDictBits; }
void SetKeepHistory(bool keepHistory) { _keepHistory = keepHistory; }
CDecoder(): _keepHistory(false) {}
virtual ~CDecoder() {}
};
}}
#endif
|
