/// <summary>
/// Compare two files, ignore trailing zeros at the end, for edits log the
/// trailing zeros do not make any difference, throw exception is the files are
/// not same
/// </summary>
/// <param name="filenameSmall">first file to compare (doesn't have to be smaller)</param>
/// <param name="filenameLarge">second file to compare (doesn't have to be larger)</param>
/// <exception cref="System.IO.IOException"/>
private bool FilesEqualIgnoreTrailingZeros(string filenameSmall, string filenameLarge
)
{
ByteBuffer small = ByteBuffer.Wrap(DFSTestUtil.LoadFile(filenameSmall));
ByteBuffer large = ByteBuffer.Wrap(DFSTestUtil.LoadFile(filenameLarge));
// OEV outputs with the latest layout version, so tweak the old file's
// contents to have latest version so checkedin binary files don't
// require frequent updates
small.Put(3, unchecked ((byte)NameNodeLayoutVersion.CurrentLayoutVersion));
// now correct if it's otherwise
if (small.Capacity() > large.Capacity())
{
ByteBuffer tmpByteBuffer = small;
small = large;
large = tmpByteBuffer;
string tmpFilename = filenameSmall;
filenameSmall = filenameLarge;
filenameLarge = tmpFilename;
}
// compare from 0 to capacity of small
// the rest of the large should be all zeros
small.Position(0);
small.Limit(small.Capacity());
large.Position(0);
large.Limit(small.Capacity());
// compares position to limit
if (!small.Equals(large))
{
return(false);
}
// everything after limit should be 0xFF
int i = large.Limit();
large.Clear();
for (; i < large.Capacity(); i++)
{
if (large.Get(i) != FSEditLogOpCodes.OpInvalid.GetOpCode())
{
return(false);
}
}
return(true);
}