filecommon.cpp

使用visual studio 2005 开发的开源文件、磁盘加密软件。这是6.1a版。加密自己资料的好工具。也是学习的优秀范本。结成了众多加密算法。

/*
 Copyright (c) 2008 TrueCrypt Foundation. All rights reserved.

 Governed by the TrueCrypt License 2.6 the full text of which is contained
 in the file License.txt included in TrueCrypt binary and source code
 distribution packages.
*/

#include "File.h"
#ifdef TC_UNIX
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <utime.h>
#endif

namespace TrueCrypt
{
	File::~File ()
	{
		try
		{
			if (FileIsOpen)
				Close();
		}
		catch (...) { }
	}

	void File::Copy (const FilePath &sourcePath, const FilePath &destinationPath, bool preserveTimestamps)
	{
		File source;
		source.Open (sourcePath);

		File destination;
		destination.Open (destinationPath, CreateWrite);

		SecureBuffer buffer (OptimalReadSize);
		uint64 len;

		while ((len = source.Read (buffer)) > 0)
		{
			destination.Write (buffer, static_cast <size_t> (len));
		}

		if (preserveTimestamps)
		{
			destination.Flush();
#ifndef TC_WINDOWS
			struct stat statData;
			throw_sys_sub_if (stat (string (sourcePath).c_str(), &statData) == -1, wstring (sourcePath));

			struct utimbuf u;
			u.actime = statData.st_atime;
			u.modtime = statData.st_mtime;
			throw_sys_sub_if (utime (string (destinationPath).c_str(), &u) == -1, wstring (destinationPath));
#endif
		}
	}
	
	FilePath File::GetPath () const
	{
		if_debug (ValidateState());
		return Path;
	}

	void File::ReadCompleteBuffer (const BufferPtr &buffer) const
	{
		size_t dataLeft = buffer.Size();
		size_t offset = 0;

		while (dataLeft > 0)
		{
			size_t dataRead = static_cast <size_t> (Read (buffer.GetRange (offset, dataLeft)));
			if (dataRead == 0)
				throw InsufficientData (SRC_POS);

			dataLeft -= dataRead;
			offset += dataRead;
		}
	}
	
	void File::ValidateState () const
	{
		if (!FileIsOpen)
			throw NotInitialized (SRC_POS);
	}
}