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
|
// PpmdDecoder.cpp
// 2009-03-11 : Igor Pavlov : Public domain
#include "StdAfx.h"
#include "../../../C/Alloc.h"
#include "../../../C/CpuArch.h"
#include "../Common/StreamUtils.h"
#include "PpmdDecoder.h"
namespace NCompress {
namespace NPpmd {
static const UInt32 kBufSize = (1 << 20);
enum
{
kStatus_NeedInit,
kStatus_Normal,
kStatus_Finished,
kStatus_Error
};
static void *SzBigAlloc(void *, size_t size) { return BigAlloc(size); }
static void SzBigFree(void *, void *address) { BigFree(address); }
static ISzAlloc g_BigAlloc = { SzBigAlloc, SzBigFree };
CDecoder::~CDecoder()
{
::MidFree(_outBuf);
Ppmd7_Free(&_ppmd, &g_BigAlloc);
}
STDMETHODIMP CDecoder::SetDecoderProperties2(const Byte *props, UInt32 size)
{
if (size < 5)
return E_INVALIDARG;
_order = props[0];
UInt32 memSize = GetUi32(props + 1);
if (_order < PPMD7_MIN_ORDER ||
_order > PPMD7_MAX_ORDER ||
memSize < PPMD7_MIN_MEM_SIZE ||
memSize > PPMD7_MAX_MEM_SIZE)
return E_NOTIMPL;
if (!_inStream.Alloc(1 << 20))
return E_OUTOFMEMORY;
if (!Ppmd7_Alloc(&_ppmd, memSize, &g_BigAlloc))
return E_OUTOFMEMORY;
return S_OK;
}
HRESULT CDecoder::CodeSpec(Byte *memStream, UInt32 size)
{
switch(_status)
{
case kStatus_Finished: return S_OK;
case kStatus_Error: return S_FALSE;
case kStatus_NeedInit:
_inStream.Init();
if (!Ppmd7z_RangeDec_Init(&_rangeDec))
{
_status = kStatus_Error;
return S_FALSE;
}
_status = kStatus_Normal;
Ppmd7_Init(&_ppmd, _order);
break;
}
if (_outSizeDefined)
{
const UInt64 rem = _outSize - _processedSize;
if (size > rem)
size = (UInt32)rem;
}
UInt32 i;
int sym = 0;
for (i = 0; i != size; i++)
{
sym = Ppmd7_DecodeSymbol(&_ppmd, &_rangeDec.p);
if (_inStream.Extra || sym < 0)
break;
memStream[i] = (Byte)sym;
}
_processedSize += i;
if (_inStream.Extra)
{
_status = kStatus_Error;
return _inStream.Res;
}
if (sym < 0)
_status = (sym < -1) ? kStatus_Error : kStatus_Finished;
return S_OK;
}
STDMETHODIMP CDecoder::Code(ISequentialInStream *inStream, ISequentialOutStream *outStream,
const UInt64 * /* inSize */, const UInt64 *outSize, ICompressProgressInfo *progress)
{
if (!_outBuf)
{
_outBuf = (Byte *)::MidAlloc(kBufSize);
if (!_outBuf)
return E_OUTOFMEMORY;
}
_inStream.Stream = inStream;
SetOutStreamSize(outSize);
do
{
const UInt64 startPos = _processedSize;
HRESULT res = CodeSpec(_outBuf, kBufSize);
size_t processed = (size_t)(_processedSize - startPos);
RINOK(WriteStream(outStream, _outBuf, processed));
RINOK(res);
if (_status == kStatus_Finished)
break;
if (progress)
{
UInt64 inSize = _inStream.GetProcessed();
RINOK(progress->SetRatioInfo(&inSize, &_processedSize));
}
}
while (!_outSizeDefined || _processedSize < _outSize);
return S_OK;
}
STDMETHODIMP CDecoder::SetOutStreamSize(const UInt64 *outSize)
{
_outSizeDefined = (outSize != NULL);
if (_outSizeDefined)
_outSize = *outSize;
_processedSize = 0;
_status = kStatus_NeedInit;
return S_OK;
}
#ifndef NO_READ_FROM_CODER
STDMETHODIMP CDecoder::SetInStream(ISequentialInStream *inStream)
{
InSeqStream = inStream;
_inStream.Stream = inStream;
return S_OK;
}
STDMETHODIMP CDecoder::ReleaseInStream()
{
InSeqStream.Release();
return S_OK;
}
STDMETHODIMP CDecoder::Read(void *data, UInt32 size, UInt32 *processedSize)
{
const UInt64 startPos = _processedSize;
HRESULT res = CodeSpec((Byte *)data, size);
if (processedSize)
*processedSize = (UInt32)(_processedSize - startPos);
return res;
}
#endif
}}
|
