xref: /third_party/lzma/CPP/Common/CrcReg.cpp (revision 370b324c) 
1// CrcReg.cpp
2
3#include "StdAfx.h"
4
5#include "../../C/7zCrc.h"
6#include "../../C/CpuArch.h"
7
8#include "../Common/MyCom.h"
9
10#include "../7zip/Common/RegisterCodec.h"
11
12EXTERN_C_BEGIN
13
14// UInt32 Z7_FASTCALL CrcUpdateT1(UInt32 v, const void *data, size_t size, const UInt32 *table);
15
16extern CRC_FUNC g_CrcUpdate;
17// extern CRC_FUNC g_CrcUpdateT4;
18extern CRC_FUNC g_CrcUpdateT8;
19extern CRC_FUNC g_CrcUpdateT0_32;
20extern CRC_FUNC g_CrcUpdateT0_64;
21
22EXTERN_C_END
23
24Z7_CLASS_IMP_COM_2(
25  CCrcHasher
26  , IHasher
27  , ICompressSetCoderProperties
28)
29  UInt32 _crc;
30  CRC_FUNC _updateFunc;
31
32  Z7_CLASS_NO_COPY(CCrcHasher)
33
34  bool SetFunctions(UInt32 tSize);
35public:
36  Byte _mtDummy[1 << 7];  // it's public to eliminate clang warning: unused private field
37
38  CCrcHasher(): _crc(CRC_INIT_VAL) { SetFunctions(0); }
39};
40
41bool CCrcHasher::SetFunctions(UInt32 tSize)
42{
43  CRC_FUNC f = NULL;
44       if (tSize ==  0) f = g_CrcUpdate;
45  // else if (tSize ==  1) f = CrcUpdateT1;
46  // else if (tSize ==  4) f = g_CrcUpdateT4;
47  else if (tSize ==  8) f = g_CrcUpdateT8;
48  else if (tSize == 32) f = g_CrcUpdateT0_32;
49  else if (tSize == 64) f = g_CrcUpdateT0_64;
50
51  if (!f)
52  {
53    _updateFunc = g_CrcUpdate;
54    return false;
55  }
56  _updateFunc = f;
57  return true;
58}
59
60Z7_COM7F_IMF(CCrcHasher::SetCoderProperties(const PROPID *propIDs, const PROPVARIANT *coderProps, UInt32 numProps))
61{
62  for (UInt32 i = 0; i < numProps; i++)
63  {
64    if (propIDs[i] == NCoderPropID::kDefaultProp)
65    {
66      const PROPVARIANT &prop = coderProps[i];
67      if (prop.vt != VT_UI4)
68        return E_INVALIDARG;
69      if (!SetFunctions(prop.ulVal))
70        return E_NOTIMPL;
71    }
72  }
73  return S_OK;
74}
75
76Z7_COM7F_IMF2(void, CCrcHasher::Init())
77{
78  _crc = CRC_INIT_VAL;
79}
80
81Z7_COM7F_IMF2(void, CCrcHasher::Update(const void *data, UInt32 size))
82{
83  _crc = _updateFunc(_crc, data, size, g_CrcTable);
84}
85
86Z7_COM7F_IMF2(void, CCrcHasher::Final(Byte *digest))
87{
88  const UInt32 val = CRC_GET_DIGEST(_crc);
89  SetUi32(digest, val)
90}
91
92REGISTER_HASHER(CCrcHasher, 0x1, "CRC32", 4)
93