public NumberFilesManager(Arguments arguments)
{
m_Reader1 = new NumberStreamReader(arguments.Input1);
m_Reader2 = new NumberStreamReader(arguments.Input2);
m_OutputStream = new FileStream(arguments.Output, File.Exists(arguments.Output) ?
FileMode.Truncate : FileMode.Create, FileAccess.Write);
m_Operation = arguments.Operator;
m_IsFast = arguments.IsFast;
}
public NumberFilesManager(
Stream inputStream1, Stream inputStream2, Stream outputSteam, Operation operation)
{
if (operation != Operation.Substraction && operation != Operation.Addition)
{
throw new ArgumentOutOfRangeException("operation");
}
m_Reader1 = new NumberStreamReader(inputStream1);
m_Reader2 = new NumberStreamReader(inputStream2);
m_OutputStream = outputSteam;
m_Operation = operation;
}
public static bool?FirstIsBigger(NumberStreamReader reader1, NumberStreamReader reader2)
{
if (reader1 == null)
{
throw new ArgumentNullException("reader1");
}
if (reader2 == null)
{
throw new ArgumentNullException("reader2");
}
if (reader1.Info == null)
{
throw new ArgumentNullException("rangeInfo1");
}
if (reader2.Info == null)
{
throw new ArgumentNullException("rangeInfo2");
}
bool?firstIsBigger = null;
var length1 = reader1.Info.RealPartPosition.GetLength();
var length2 = reader2.Info.RealPartPosition.GetLength();
if (length1 > length2)
{
firstIsBigger = true;
}
else if (length1 < length2)
{
firstIsBigger = false;
}
else
{
// Need to scan file and find out which is bigger!
reader1.Stream.Seek(reader1.Info.RealPartPosition.From, SeekOrigin.Begin);
reader2.Stream.Seek(reader2.Info.RealPartPosition.From, SeekOrigin.Begin);
var enumerator1 = reader1.ReadContentFromBegin(length1).GetEnumerator();
var enumerator2 = reader2.ReadContentFromBegin(length1).GetEnumerator();
bool continueReading = true;
while (continueReading)
{
continueReading = enumerator1.MoveNext();
if (continueReading)
{
continueReading = enumerator2.MoveNext();
}
if (continueReading)
{
continueReading = (enumerator1.Current != null && enumerator1.Current.Length > 0) ||
(enumerator2.Current != null && enumerator2.Current.Length > 0);
}
if (continueReading)
{
// Compare symbols from
for (int i = 0; i < enumerator1.Current.Length; i++)
{
if (enumerator1.Current[i] > enumerator2.Current[i])
{
firstIsBigger = true;
continueReading = false;
break;
}
else if (enumerator1.Current[i] < enumerator2.Current[i])
{
firstIsBigger = false;
continueReading = false;
break;
}
}
}
}
}
return(firstIsBigger);
}