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Refactor: use Types instead of Windows types in CRC

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This commit is contained in:
Sergey Lipskiy 2013-11-27 12:38:49 +07:00
parent c38bd35251
commit ef50ef71d2
2 changed files with 18 additions and 26 deletions
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34
CRC.cpp
View File

@ -1,16 +1,12 @@
#ifndef __LINUX__
# include <windows.h>
#else
# include "winlnxdefs.h"
#endif // __LINUX__
#include "Types.h"
#define CRC32_POLYNOMIAL 0x04C11DB7
unsigned long CRCTable[ 256 ];
unsigned int CRCTable[ 256 ];
DWORD Reflect( DWORD ref, char ch )
u32 Reflect( u32 ref, char ch )
{
DWORD value = 0;
u32 value = 0;
// Swap bit 0 for bit 7
// bit 1 for bit 6, etc.
@ -25,10 +21,10 @@ DWORD Reflect( DWORD ref, char ch )
void CRC_BuildTable()
{
DWORD crc;
u32 crc;
for (int i = 0; i <= 255; i++)
{
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);
@ -37,24 +33,24 @@ void CRC_BuildTable()
}
}
DWORD CRC_Calculate( DWORD crc, void *buffer, DWORD count )
u32 CRC_Calculate( u32 crc, void *buffer, u32 count )
{
BYTE *p;
DWORD orig = crc;
u8 *p;
u32 orig = crc;
p = (BYTE*) buffer;
p = (u8*) buffer;
while (count--)
crc = (crc >> 8) ^ CRCTable[(crc & 0xFF) ^ *p++];
return crc ^ orig;
}
DWORD CRC_CalculatePalette( DWORD crc, void *buffer, DWORD count )
u32 CRC_CalculatePalette( u32 crc, void *buffer, u32 count )
{
BYTE *p;
DWORD orig = crc;
u8 *p;
u32 orig = crc;
p = (BYTE*) buffer;
p = (u8*) buffer;
while (count--)
{
crc = (crc >> 8) ^ CRCTable[(crc & 0xFF) ^ *p++];

10
CRC.h
View File

@ -1,10 +1,6 @@
#ifndef __LINUX__
# include <windows.h>
#else
# include "winlnxdefs.h"
#endif // __LINUX__
#include "Types.h"
void CRC_BuildTable();
DWORD CRC_Calculate( DWORD crc, void *buffer, DWORD count );
DWORD CRC_CalculatePalette( DWORD crc, void *buffer, DWORD count );
u32 CRC_Calculate( u32 crc, void *buffer, u32 count );
u32 CRC_CalculatePalette( u32 crc, void *buffer, u32 count );