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
|
// CrcReg.cpp
#include "StdAfx.h"
#include "../../C/7zCrc.h"
#include "../../C/CpuArch.h"
#include "../Common/MyCom.h"
#include "../7zip/Common/RegisterCodec.h"
EXTERN_C_BEGIN
typedef UInt32 (MY_FAST_CALL *CRC_FUNC)(UInt32 v, const void *data, size_t size, const UInt32 *table);
UInt32 MY_FAST_CALL CrcUpdateT1(UInt32 v, const void *data, size_t size, const UInt32 *table);
extern CRC_FUNC g_CrcUpdate;
extern CRC_FUNC g_CrcUpdateT8;
extern CRC_FUNC g_CrcUpdateT4;
EXTERN_C_END
class CCrcHasher:
public IHasher,
public ICompressSetCoderProperties,
public CMyUnknownImp
{
UInt32 _crc;
CRC_FUNC _updateFunc;
Byte mtDummy[1 << 7];
bool SetFunctions(UInt32 tSize);
public:
CCrcHasher(): _crc(CRC_INIT_VAL) { SetFunctions(0); }
MY_UNKNOWN_IMP2(IHasher, ICompressSetCoderProperties)
INTERFACE_IHasher(;)
STDMETHOD(SetCoderProperties)(const PROPID *propIDs, const PROPVARIANT *props, UInt32 numProps);
};
bool CCrcHasher::SetFunctions(UInt32 tSize)
{
_updateFunc = g_CrcUpdate;
if (tSize == 1)
_updateFunc = CrcUpdateT1;
else if (tSize == 4)
{
if (g_CrcUpdateT4)
_updateFunc = g_CrcUpdateT4;
else
return false;
}
else if (tSize == 8)
{
if (g_CrcUpdateT8)
_updateFunc = g_CrcUpdateT8;
else
return false;
}
return true;
}
STDMETHODIMP CCrcHasher::SetCoderProperties(const PROPID *propIDs, const PROPVARIANT *coderProps, UInt32 numProps)
{
for (UInt32 i = 0; i < numProps; i++)
{
const PROPVARIANT &prop = coderProps[i];
if (propIDs[i] == NCoderPropID::kDefaultProp)
{
if (prop.vt != VT_UI4)
return E_INVALIDARG;
if (!SetFunctions(prop.ulVal))
return E_NOTIMPL;
}
}
return S_OK;
}
STDMETHODIMP_(void) CCrcHasher::Init() throw()
{
_crc = CRC_INIT_VAL;
}
STDMETHODIMP_(void) CCrcHasher::Update(const void *data, UInt32 size) throw()
{
_crc = _updateFunc(_crc, data, size, g_CrcTable);
}
STDMETHODIMP_(void) CCrcHasher::Final(Byte *digest) throw()
{
UInt32 val = CRC_GET_DIGEST(_crc);
SetUi32(digest, val);
}
REGISTER_HASHER(CCrcHasher, 0x1, "CRC32", 4)
|
