public bool StreamsEqual(Stream stream1, Stream stream2, long size, bool async)
{
if (size == 0L)
{
if (stream1.CanSeek && stream2.CanSeek)
{
long num = stream1.Seek(0L, SeekOrigin.End);
long num2 = stream1.Seek(0L, SeekOrigin.End);
if (num != num2)
{
return false;
}
if ((num == 0L) && (num2 == 0L))
{
return true;
}
size = num;
stream1.Seek(0L, SeekOrigin.Begin);
stream2.Seek(0L, SeekOrigin.Begin);
}
else
{
size = 0x7fffffffL;
}
}
if (this.FBuffers1 == null)
{
this.FBuffers1 = new Buffers(0x40000);
}
if (this.FBuffers2 == null)
{
this.FBuffers2 = new Buffers(0x40000);
}
Buffers buffers = this.FBuffers1;
Buffers buffers2 = this.FBuffers2;
int length = this.FBuffers1.Buffer1.Length;
AsyncBuffersEqualCaller caller = new AsyncBuffersEqualCaller(ByteArrayHelper.Equals);
IAsyncResult result = null;
while ((size > 0L) && (length == this.FBuffers1.Buffer1.Length))
{
base.CheckSuspendingPending();
if (base.CancellationPending)
{
return false;
}
length = (int) Math.Min(size, (long) this.FBuffers1.Buffer1.Length);
if (async)
{
length = ReadBuffersAsync(stream1, stream2, buffers, length);
}
else
{
int num4 = ReadBuffer(stream1, buffers.Buffer1, length);
if (num4 != ReadBuffer(stream2, buffers.Buffer2, length))
{
length = -1;
}
else
{
length = num4;
}
}
if ((length < 0) || ((result != null) && !caller.EndInvoke(result)))
{
return false;
}
if (length == 0)
{
return true;
}
buffers2 = Interlocked.Exchange<Buffers>(ref buffers, buffers2);
this.FProcessedSize += length;
this.OnProgress();
result = caller.BeginInvoke(buffers2.Buffer1, buffers2.Buffer2, length, null, null);
size -= length;
}
return caller.EndInvoke(result);
}
private static int ReadBuffersAsync(Stream stream1, Stream stream2, Buffers buffers, int readSize)
{
int offset = 0;
int num2 = 0;
int num3 = 1;
int num4 = 1;
do
{
IAsyncResult asyncResult = null;
IAsyncResult result2 = null;
if (num3 > 0)
{
asyncResult = stream1.BeginRead(buffers.Buffer1, offset, readSize - offset, null, null);
}
if (num4 > 0)
{
result2 = stream2.BeginRead(buffers.Buffer2, num2, readSize - num2, null, null);
}
if (asyncResult != null)
{
num3 = stream1.EndRead(asyncResult);
}
if (result2 != null)
{
num4 = stream2.EndRead(result2);
}
offset += num3;
num2 += num4;
}
while (((num3 != 0) || (num4 != 0)) && ((offset != readSize) || (num2 != readSize)));
if (offset == num2)
{
return offset;
}
return -1;
}