diff options
Diffstat (limited to 'CPP/Common/CRC.h')
-rwxr-xr-x | CPP/Common/CRC.h | 36 |
1 files changed, 36 insertions, 0 deletions
diff --git a/CPP/Common/CRC.h b/CPP/Common/CRC.h new file mode 100755 index 00000000..277ae673 --- /dev/null +++ b/CPP/Common/CRC.h @@ -0,0 +1,36 @@ +// Common/CRC.h + +#ifndef __COMMON_CRC_H +#define __COMMON_CRC_H + +#include <stddef.h> +#include "Types.h" + +class CCRC +{ + UInt32 _value; +public: + static UInt32 Table[256]; + static void InitTable(); + + CCRC(): _value(0xFFFFFFFF){}; + void Init() { _value = 0xFFFFFFFF; } + void UpdateByte(Byte v); + void UpdateUInt16(UInt16 v); + void UpdateUInt32(UInt32 v); + void UpdateUInt64(UInt64 v); + void Update(const void *data, size_t size); + UInt32 GetDigest() const { return _value ^ 0xFFFFFFFF; } + static UInt32 CalculateDigest(const void *data, size_t size) + { + CCRC crc; + crc.Update(data, size); + return crc.GetDigest(); + } + static bool VerifyDigest(UInt32 digest, const void *data, size_t size) + { + return (CalculateDigest(data, size) == digest); + } +}; + +#endif |