Add original TrueCrypt 7.1a sources

src/Platform/Buffer.cpp

@@ -0,0 +1,142 @@
+/*
+ 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.
+*/
+
+#include "Buffer.h"
+#include "Exception.h"
+
+namespace TrueCrypt
+{
+	Buffer::Buffer () : DataPtr (nullptr), DataSize (0)
+	{
+	}
+
+	Buffer::Buffer (size_t size) : DataPtr (nullptr), DataSize (0)
+	{
+		Allocate (size);
+	}
+
+	Buffer::~Buffer ()
+	{
+		if (DataPtr != nullptr)
+			Free ();
+	}
+
+	void Buffer::Allocate (size_t size)
+	{
+		if (size < 1)
+			throw ParameterIncorrect (SRC_POS);
+
+		if (DataPtr != nullptr)
+		{
+			if (DataSize == size)
+				return;
+			Free();
+		}
+
+		try
+		{
+			DataPtr = static_cast<byte *> (Memory::Allocate (size));
+			DataSize = size;
+		}
+		catch (...)
+		{
+			DataPtr = nullptr;
+			DataSize = 0;
+			throw;
+		}
+	}
+
+	void Buffer::CopyFrom (const ConstBufferPtr &bufferPtr)
+	{
+		if (!IsAllocated ())
+			Allocate (bufferPtr.Size());
+		else if (bufferPtr.Size() > DataSize)
+			throw ParameterTooLarge (SRC_POS);
+
+		Memory::Copy (DataPtr, bufferPtr.Get(), bufferPtr.Size());
+	}
+
+	void Buffer::Erase ()
+	{
+		if (DataSize > 0)
+			Memory::Erase (DataPtr, DataSize);
+	}
+
+	void Buffer::Free ()
+	{
+		if (DataPtr == nullptr)
+			throw NotInitialized (SRC_POS);
+
+		Memory::Free (DataPtr);
+		DataPtr = nullptr;
+		DataSize = 0;
+	}
+
+	BufferPtr Buffer::GetRange (size_t offset, size_t size) const
+	{
+		if (offset + size > DataSize)
+			throw ParameterIncorrect (SRC_POS);
+
+		return BufferPtr (DataPtr + offset, size);
+	}
+	
+	void Buffer::Zero ()
+	{
+		if (DataSize > 0)
+			Memory::Zero (DataPtr, DataSize);
+	}
+
+	SecureBuffer::SecureBuffer (size_t size)
+	{
+		Allocate (size);
+	}
+
+	SecureBuffer::~SecureBuffer ()
+	{
+		if (DataPtr != nullptr && DataSize != 0)
+			Free ();
+	}
+
+	void SecureBuffer::Allocate (size_t size)
+	{
+		Buffer::Allocate (size);
+	}
+
+	void SecureBuffer::Free ()
+	{
+		if (DataPtr == nullptr)
+			throw NotInitialized (SRC_POS);
+
+		Erase ();
+		Buffer::Free ();
+	}
+
+	void BufferPtr::CopyFrom (const ConstBufferPtr &bufferPtr) const
+	{
+		if (bufferPtr.Size() > DataSize)
+			throw ParameterTooLarge (SRC_POS);
+
+		Memory::Copy (DataPtr, bufferPtr.Get(), bufferPtr.Size());
+	}
+
+	BufferPtr BufferPtr::GetRange (size_t offset, size_t size) const
+	{
+		if (offset + size > DataSize)
+			throw ParameterIncorrect (SRC_POS);
+
+		return BufferPtr (DataPtr + offset, size);
+	}
+
+	ConstBufferPtr ConstBufferPtr::GetRange (size_t offset, size_t size) const
+	{
+		if (offset + size > DataSize)
+			throw ParameterIncorrect (SRC_POS);
+
+		return ConstBufferPtr (DataPtr + offset, size);
+	}
+}