1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/other-licenses/7zstub/src/Common/CRC.h Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,36 @@
1.4 +// Common/CRC.h
1.5 +
1.6 +#ifndef __COMMON_CRC_H
1.7 +#define __COMMON_CRC_H
1.8 +
1.9 +#include <stddef.h>
1.10 +#include "Types.h"
1.11 +
1.12 +class CCRC
1.13 +{
1.14 + UInt32 _value;
1.15 +public:
1.16 + static UInt32 Table[256];
1.17 + static void InitTable();
1.18 +
1.19 + CCRC(): _value(0xFFFFFFFF){};
1.20 + void Init() { _value = 0xFFFFFFFF; }
1.21 + void UpdateByte(Byte v);
1.22 + void UpdateUInt16(UInt16 v);
1.23 + void UpdateUInt32(UInt32 v);
1.24 + void UpdateUInt64(UInt64 v);
1.25 + void Update(const void *data, size_t size);
1.26 + UInt32 GetDigest() const { return _value ^ 0xFFFFFFFF; }
1.27 + static UInt32 CalculateDigest(const void *data, size_t size)
1.28 + {
1.29 + CCRC crc;
1.30 + crc.Update(data, size);
1.31 + return crc.GetDigest();
1.32 + }
1.33 + static bool VerifyDigest(UInt32 digest, const void *data, size_t size)
1.34 + {
1.35 + return (CalculateDigest(data, size) == digest);
1.36 + }
1.37 +};
1.38 +
1.39 +#endif
