public bool Equals(FileInfoStream fs1, FileInfoStream fs2)
{
if (fs1 == null)
{
throw new ArgumentNullException(nameof(fs1));
}
if (fs2 == null)
{
throw new ArgumentNullException(nameof(fs2));
}
if (fs1.File.Length != fs2.File.Length)
{
return(false);
}
if (fs1.File.Length == 0)
{
return(true);
}
fs1.Seek(0, SeekOrigin.Begin);
fs2.Seek(0, SeekOrigin.Begin);
return(InternalEquals(fs1, fs2));
}
private static void ReadFile(FileInfoStream fs, byte[] buffer, int offset, int count)
{
try
{
fs.SafeRead(buffer, offset, count);
}
catch (IOException ex)
{
throw new FileSystemInfoException(fs.File, ex);
}
}
private bool InternalEquals(FileInfoStream fs1, FileInfoStream fs2)
{
var bytesLeft = fs1.Length;
do
{
var len = (int)Math.Min(bytesLeft, BufferSize);
ReadFile(fs1, _buffer1, 0, len);
ReadFile(fs2, _buffer2, 0, len);
if (NativeMethods.memcmp(_buffer1, _buffer2, new UIntPtr((uint)len)) != 0)
{
return(false);
}
bytesLeft -= len;
} while (bytesLeft > 0);
return(true);
}
private bool InternalEquals(FileInfoStream fs1, FileInfoStream fs2)
{
var bytesLeft = fs1.Length;
var read = (int)Math.Min(bytesLeft, BufferSize);
if (fs1.File != _lastFile1)
{
ReadFile(fs1, _buffer1, 0, read);
_lastFile1 = fs1.File;
}
ReadFile(fs2, _buffer2, 0, read);
if (NativeMethods.memcmp(_buffer1, _buffer2, new UIntPtr((uint)read)) != 0)
{
return(false);
}
if (read < bytesLeft)
{
_lastFile1 = null;
while ((bytesLeft -= read) > 0)
{
read = (int)Math.Min(bytesLeft, BufferSize);
ReadFile(fs1, _buffer1, 0, read);
ReadFile(fs2, _buffer2, 0, read);
if (NativeMethods.memcmp(_buffer1, _buffer2, new UIntPtr((uint)read)) != 0)
{
return(false);
}
}
}
return(true);
}
