14e2277962
while others dislike them being extra commits, let's clean them up once and for all for the existing code. If it's ugly, let it only be ugly once :-) Signed-off-by: Stefan Reinauer <stepan@coresystems.de> Acked-by: Stefan Reinauer <stepan@coresystems.de> git-svn-id: svn://svn.coreboot.org/coreboot/trunk@5507 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1
62 lines
1.0 KiB
C++
62 lines
1.0 KiB
C++
// Common/CRC.cpp
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#include "StdAfx.h"
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#include "CRC.h"
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static const UInt32 kCRCPoly = 0xEDB88320;
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UInt32 CCRC::Table[256];
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void CCRC::InitTable()
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{
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for (UInt32 i = 0; i < 256; i++)
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{
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UInt32 r = i;
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for (int j = 0; j < 8; j++)
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if (r & 1)
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r = (r >> 1) ^ kCRCPoly;
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else
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r >>= 1;
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CCRC::Table[i] = r;
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}
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}
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class CCRCTableInit
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{
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public:
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CCRCTableInit() { CCRC::InitTable(); }
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} g_CRCTableInit;
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void CCRC::UpdateByte(Byte b)
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{
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_value = Table[((Byte)(_value)) ^ b] ^ (_value >> 8);
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}
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void CCRC::UpdateUInt16(UInt16 v)
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{
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UpdateByte(Byte(v));
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UpdateByte(Byte(v >> 8));
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}
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void CCRC::UpdateUInt32(UInt32 v)
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{
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for (int i = 0; i < 4; i++)
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UpdateByte((Byte)(v >> (8 * i)));
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}
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void CCRC::UpdateUInt64(UInt64 v)
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{
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for (int i = 0; i < 8; i++)
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UpdateByte((Byte)(v >> (8 * i)));
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}
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void CCRC::Update(const void *data, size_t size)
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{
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UInt32 v = _value;
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const Byte *p = (const Byte *)data;
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for (; size > 0 ; size--, p++)
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v = Table[((Byte)(v)) ^ *p] ^ (v >> 8);
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_value = v;
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}
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