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// **************************************************************************
// * This file is part of the FreeFileSync project. It is distributed under *
// * GNU General Public License: http://www.gnu.org/licenses/gpl.html *
// * Copyright (C) 2008-2010 ZenJu (zhnmju123 AT gmx.de) *
// **************************************************************************
//
#include "binary.h"
#include <boost/scoped_array.hpp>
#include "../shared/fileIO.h"
bool FreeFileSync::filesHaveSameContent(const Zstring& filename1, const Zstring& filename2, CompareCallback& callback)
{
const size_t BUFFER_SIZE = 512 * 1024; //512 kb seems to be the perfect buffer size
static boost::scoped_array<unsigned char> memory1(new unsigned char[BUFFER_SIZE]);
static boost::scoped_array<unsigned char> memory2(new unsigned char[BUFFER_SIZE]);
FileInput file1(filename1); //throw FileError()
FileInput file2(filename2); //throw FileError()
wxLongLong bytesCompared;
do
{
const size_t length1 = file1.read(memory1.get(), BUFFER_SIZE); //returns actual number of bytes read; throw FileError()
const size_t length2 = file2.read(memory2.get(), BUFFER_SIZE); //
if (length1 != length2 || ::memcmp(memory1.get(), memory2.get(), length1) != 0)
return false;
bytesCompared += length1 * 2;
//send progress updates
callback.updateCompareStatus(bytesCompared);
}
while (!file1.eof());
if (!file1.eof()) //highly unlikely, but theoretically possible! (but then again, not in this context where both files have same size...)
return false;
return true;
}
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