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Code cleanup: cleanup CRC.h and CRC.cpp

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This commit is contained in:
Sergey Lipskiy 2014-09-03 12:08:04 +07:00
parent 23f7f24d35
commit 1a43c89db3
2 changed files with 30 additions and 33 deletions
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59
CRC.cpp
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@ -6,58 +6,55 @@ unsigned int CRCTable[ 256 ];
u32 Reflect( u32 ref, char ch )
{
u32 value = 0;
u32 value = 0;
// Swap bit 0 for bit 7
// bit 1 for bit 6, etc.
for (int i = 1; i < (ch + 1); i++)
{
if(ref & 1)
value |= 1 << (ch - i);
ref >>= 1;
}
return value;
// Swap bit 0 for bit 7
// bit 1 for bit 6, etc.
for (int i = 1; i < (ch + 1); ++i) {
if(ref & 1)
value |= 1 << (ch - i);
ref >>= 1;
}
return value;
}
void CRC_BuildTable()
{
u32 crc;
u32 crc;
for (int i = 0; i < 256; i++)
{
crc = Reflect( i, 8 ) << 24;
for (int j = 0; j < 8; j++)
for (int i = 0; i < 256; ++i) {
crc = Reflect( i, 8 ) << 24;
for (int j = 0; j < 8; ++j)
crc = (crc << 1) ^ (crc & (1 << 31) ? CRC32_POLYNOMIAL : 0);
CRCTable[i] = Reflect( crc, 32 );
}
CRCTable[i] = Reflect( crc, 32 );
}
}
u32 CRC_Calculate( u32 crc, void *buffer, u32 count )
u32 CRC_Calculate( u32 crc, const void * buffer, u32 count )
{
u8 *p;
u32 orig = crc;
u8 *p;
u32 orig = crc;
p = (u8*) buffer;
while (count--)
p = (u8*) buffer;
while (count--)
crc = (crc >> 8) ^ CRCTable[(crc & 0xFF) ^ *p++];
return crc ^ orig;
return crc ^ orig;
}
u32 CRC_CalculatePalette( u32 crc, void *buffer, u32 count )
u32 CRC_CalculatePalette(u32 crc, const void * buffer, u32 count )
{
u8 *p;
u32 orig = crc;
u8 *p;
u32 orig = crc;
p = (u8*) buffer;
while (count--)
{
p = (u8*) buffer;
while (count--) {
crc = (crc >> 8) ^ CRCTable[(crc & 0xFF) ^ *p++];
crc = (crc >> 8) ^ CRCTable[(crc & 0xFF) ^ *p++];
p += 6;
}
return crc ^ orig;
return crc ^ orig;
}

4
CRC.h
View File

@ -2,5 +2,5 @@
void CRC_BuildTable();
u32 CRC_Calculate( u32 crc, void *buffer, u32 count );
u32 CRC_CalculatePalette( u32 crc, void *buffer, u32 count );
u32 CRC_Calculate( u32 crc, const void *buffer, u32 count );
u32 CRC_CalculatePalette( u32 crc, const void *buffer, u32 count );