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
|
// DeltaFilter.cpp
#include "StdAfx.h"
#include "../../../C/Delta.h"
#include "../Common/RegisterCodec.h"
#include "BranchCoder.h"
struct CDelta
{
unsigned _delta;
Byte _state[DELTA_STATE_SIZE];
CDelta(): _delta(1) {}
void DeltaInit() { Delta_Init(_state); }
};
class CDeltaEncoder:
public ICompressFilter,
public ICompressSetCoderProperties,
public ICompressWriteCoderProperties,
CDelta,
public CMyUnknownImp
{
public:
MY_UNKNOWN_IMP2(ICompressSetCoderProperties, ICompressWriteCoderProperties)
STDMETHOD(Init)();
STDMETHOD_(UInt32, Filter)(Byte *data, UInt32 size);
STDMETHOD(SetCoderProperties)(const PROPID *propIDs, const PROPVARIANT *props, UInt32 numProps);
STDMETHOD(WriteCoderProperties)(ISequentialOutStream *outStream);
};
class CDeltaDecoder:
public ICompressFilter,
public ICompressSetDecoderProperties2,
CDelta,
public CMyUnknownImp
{
public:
MY_UNKNOWN_IMP1(ICompressSetDecoderProperties2)
STDMETHOD(Init)();
STDMETHOD_(UInt32, Filter)(Byte *data, UInt32 size);
STDMETHOD(SetDecoderProperties2)(const Byte *data, UInt32 size);
};
STDMETHODIMP CDeltaEncoder::Init()
{
DeltaInit();
return S_OK;
}
STDMETHODIMP_(UInt32) CDeltaEncoder::Filter(Byte *data, UInt32 size)
{
Delta_Encode(_state, _delta, data, size);
return size;
}
STDMETHODIMP CDeltaEncoder::SetCoderProperties(const PROPID *propIDs, const PROPVARIANT *props, UInt32 numProps)
{
UInt32 delta = _delta;
for (UInt32 i = 0; i < numProps; i++)
{
const PROPVARIANT &prop = props[i];
if (propIDs[i] != NCoderPropID::kDefaultProp || prop.vt != VT_UI4 || prop.ulVal < 1 || prop.ulVal > 256)
return E_INVALIDARG;
delta = prop.ulVal;
}
_delta = delta;
return S_OK;
}
STDMETHODIMP CDeltaEncoder::WriteCoderProperties(ISequentialOutStream *outStream)
{
Byte prop = (Byte)(_delta - 1);
return outStream->Write(&prop, 1, NULL);
}
STDMETHODIMP CDeltaDecoder::Init()
{
DeltaInit();
return S_OK;
}
STDMETHODIMP_(UInt32) CDeltaDecoder::Filter(Byte *data, UInt32 size)
{
Delta_Decode(_state, _delta, data, size);
return size;
}
STDMETHODIMP CDeltaDecoder::SetDecoderProperties2(const Byte *props, UInt32 size)
{
if (size != 1)
return E_INVALIDARG;
_delta = (unsigned)props[0] + 1;
return S_OK;
}
#define CREATE_CODEC(x) \
static void *CreateCodec ## x() { return (void *)(ICompressFilter *)(new C ## x ## Decoder); } \
static void *CreateCodec ## x ## Out() { return (void *)(ICompressFilter *)(new C ## x ## Encoder); }
CREATE_CODEC(Delta)
#define METHOD_ITEM(x, id, name) { CreateCodec ## x, CreateCodec ## x ## Out, id, name, 1, true }
static CCodecInfo g_CodecsInfo[] =
{
METHOD_ITEM(Delta, 3, L"Delta")
};
REGISTER_CODECS(Delta)
|
