/// <exception cref="System.IO.IOException"/>
/// <exception cref="System.NotSupportedException"/>
public virtual ByteBuffer Read(ByteBufferPool bufferPool, int maxLength, EnumSet <
ReadOption> opts)
{
if (bufferPool == null)
{
throw new IOException("Please specify buffer pool.");
}
ByteBuffer buffer = bufferPool.GetBuffer(true, maxLength);
int pos = buffer.Position();
int n = Read(buffer);
if (n >= 0)
{
buffer.Position(pos);
return(buffer);
}
return(null);
}
/// <summary>Perform a fallback read.</summary>
/// <exception cref="System.IO.IOException"/>
public static ByteBuffer FallbackRead(InputStream stream, ByteBufferPool bufferPool
, int maxLength)
{
if (bufferPool == null)
{
throw new NotSupportedException("zero-copy reads " + "were not available, and you did not provide a fallback "
+ "ByteBufferPool.");
}
bool useDirect = StreamHasByteBufferRead(stream);
ByteBuffer buffer = bufferPool.GetBuffer(useDirect, maxLength);
if (buffer == null)
{
throw new NotSupportedException("zero-copy reads " + "were not available, and the ByteBufferPool did not provide "
+ "us with " + (useDirect ? "a direct" : "an indirect") + "buffer.");
}
Preconditions.CheckState(buffer.Capacity() > 0);
Preconditions.CheckState(buffer.IsDirect() == useDirect);
maxLength = Math.Min(maxLength, buffer.Capacity());
bool success = false;
try
{
if (useDirect)
{
buffer.Clear();
buffer.Limit(maxLength);
ByteBufferReadable readable = (ByteBufferReadable)stream;
int totalRead = 0;
while (true)
{
if (totalRead >= maxLength)
{
success = true;
break;
}
int nRead = readable.Read(buffer);
if (nRead < 0)
{
if (totalRead > 0)
{
success = true;
}
break;
}
totalRead += nRead;
}
buffer.Flip();
}
else
{
buffer.Clear();
int nRead = stream.Read(((byte[])buffer.Array()), buffer.ArrayOffset(), maxLength
);
if (nRead >= 0)
{
buffer.Limit(nRead);
success = true;
}
}
}
finally
{
if (!success)
{
// If we got an error while reading, or if we are at EOF, we
// don't need the buffer any more. We can give it back to the
// bufferPool.
bufferPool.PutBuffer(buffer);
buffer = null;
}
}
return(buffer);
}