VeraCrypt
aboutsummaryrefslogtreecommitdiff
path: root/src/Volume/Crc32.h
diff options
context:
space:
mode:
Diffstat (limited to 'src/Volume/Crc32.h')
-rw-r--r--src/Volume/Crc32.h44
1 files changed, 44 insertions, 0 deletions
diff --git a/src/Volume/Crc32.h b/src/Volume/Crc32.h
new file mode 100644
index 00000000..d4392275
--- /dev/null
+++ b/src/Volume/Crc32.h
@@ -0,0 +1,44 @@
+/*
+ Copyright (c) 2008 TrueCrypt Developers Association. All rights reserved.
+
+ Governed by the TrueCrypt License 3.0 the full text of which is contained in
+ the file License.txt included in TrueCrypt binary and source code distribution
+ packages.
+*/
+
+#ifndef TC_HEADER_Encryption_Crc32
+#define TC_HEADER_Encryption_Crc32
+
+#include "Platform/Platform.h"
+#include "Common/Crc.h"
+
+namespace TrueCrypt
+{
+ class Crc32
+ {
+ public:
+ Crc32 () : CrcValue (0xffffFFFF) { };
+ virtual ~Crc32 () { };
+
+ uint32 Get () const { return CrcValue ^ 0xffffFFFF; }
+
+ uint32 Process (byte data)
+ {
+ return CrcValue = crc_32_tab[(byte) (CrcValue ^ data)] ^ (CrcValue >> 8);
+ }
+
+ static uint32 ProcessBuffer (const ConstBufferPtr &buffer)
+ {
+ return ::GetCrc32 (const_cast<byte *> (buffer.Get()), static_cast<int> (buffer.Size()));
+ }
+
+ protected:
+ uint32 CrcValue;
+
+ private:
+ Crc32 (const Crc32 &);
+ Crc32 &operator= (const Crc32 &);
+ };
+}
+
+#endif // TC_HEADER_Encryption_Crc32