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49 lines
1.2 KiB
C++
49 lines
1.2 KiB
C++
/*
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Derived from source code of TrueCrypt 7.1a, which is
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Copyright (c) 2008-2012 TrueCrypt Developers Association and which is governed
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by the TrueCrypt License 3.0.
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Modifications and additions to the original source code (contained in this file)
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and all other portions of this file are Copyright (c) 2013-2017 IDRIX
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and are governed by the Apache License 2.0 the full text of which is
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contained in the file License.txt included in VeraCrypt binary and source
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code distribution packages.
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*/
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#ifndef TC_HEADER_Encryption_Crc32
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#define TC_HEADER_Encryption_Crc32
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#include "Platform/Platform.h"
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#include "Common/Crc.h"
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namespace VeraCrypt
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{
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class Crc32
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{
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public:
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Crc32 () : CrcValue (0xffffFFFF) { };
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virtual ~Crc32 () { };
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uint32 Get () const { return CrcValue ^ 0xffffFFFF; }
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uint32 Process (uint8 data)
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{
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return CrcValue = crc_32_tab[(uint8) (CrcValue ^ data)] ^ (CrcValue >> 8);
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}
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static uint32 ProcessBuffer (const ConstBufferPtr &buffer)
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{
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return ::GetCrc32 (const_cast<uint8 *> (buffer.Get()), static_cast<int> (buffer.Size()));
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}
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protected:
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uint32 CrcValue;
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private:
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Crc32 (const Crc32 &);
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Crc32 &operator= (const Crc32 &);
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};
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}
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#endif // TC_HEADER_Encryption_Crc32
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