private static void QuickHashFile(DupItem file, int quickHashSize, ref long totalFileBytes, ref long totalReadBytes)
{
Interlocked.Add(ref totalFileBytes, file.Size);
var hashSize = (int)Math.Min(file.Size, quickHashSize);
using (var stream = File.Open(file.FileName, FileMode.Open, FileAccess.Read, FileShare.Read))
{
file.Tags = new byte[hashSize];
for (var i = 0; i < 3; i++)
{
var sectionSize = hashSize / 3;
long position;
if (i == 0)
{
position = 0;
}
else if (i == 1)
{
position = file.Size / 2 - sectionSize / 2;
}
else
{
position = file.Size - sectionSize;
}
stream.Seek(position, SeekOrigin.Begin);
stream.Read(file.Tags, i * sectionSize, sectionSize);
}
file.QuickHash = HashTool.HashBytesText(file.Tags);
if (file.Size <= hashSize)
{
file.Status = CompareStatus.Matched;
}
Interlocked.Add(ref totalReadBytes, hashSize);
}
}