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other-licenses/7zstub/src/Common/CRC.h@925c144e1f1f (annotated)

other-licenses/7zstub/src/Common/CRC.h

Fri, 16 Jan 2015 18:13:44 +0100

author

Michael Schloh von Bennewitz <michael@schloh.com>

date

Fri, 16 Jan 2015 18:13:44 +0100

branch

TOR_BUG_9701

changeset 14

925c144e1f1f

permissions

-rw-r--r--

Integrate suggestion from review to improve consistency with existing code.

michael@0	1	// Common/CRC.h
michael@0	2
michael@0	3	#ifndef __COMMON_CRC_H
michael@0	4	#define __COMMON_CRC_H
michael@0	5
michael@0	6	#include <stddef.h>
michael@0	7	#include "Types.h"
michael@0	8
michael@0	9	class CCRC
michael@0	10	{
michael@0	11	UInt32 _value;
michael@0	12	public:
michael@0	13	static UInt32 Table[256];
michael@0	14	static void InitTable();
michael@0	15
michael@0	16	CCRC(): _value(0xFFFFFFFF){};
michael@0	17	void Init() { _value = 0xFFFFFFFF; }
michael@0	18	void UpdateByte(Byte v);
michael@0	19	void UpdateUInt16(UInt16 v);
michael@0	20	void UpdateUInt32(UInt32 v);
michael@0	21	void UpdateUInt64(UInt64 v);
michael@0	22	void Update(const void *data, size_t size);
michael@0	23	UInt32 GetDigest() const { return _value ^ 0xFFFFFFFF; }
michael@0	24	static UInt32 CalculateDigest(const void *data, size_t size)
michael@0	25	{
michael@0	26	CCRC crc;
michael@0	27	crc.Update(data, size);
michael@0	28	return crc.GetDigest();
michael@0	29	}
michael@0	30	static bool VerifyDigest(UInt32 digest, const void *data, size_t size)
michael@0	31	{
michael@0	32	return (CalculateDigest(data, size) == digest);
michael@0	33	}
michael@0	34	};
michael@0	35
michael@0	36	#endif