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How can I convert DataInput to DataInputStream in java? I need to know the size of the DataInput.
890
That is why it is called DataInputStream – because it reads data (numbers) instead of just bytes. An application uses a data output stream to write data that can later be read by a data input stream. Data input streams and data output streams represent Unicode strings in a format that is a slight modification of UTF-8.
An inputStream is the base class to read bytes from a stream (network or file). It provides the ability to read bytes from the stream and detect the end of the stream. DataInputStream is a kind of InputStream to read data directly as primitive data types.
Since a stream, by definition, really has no begining or end and thus no fool proof way of knowing how much is available, you just have to read from the stream in fixed sized chunks. It almost sounds like you'd be better off with plain old .read() rather than readFully():
DataInputStream dis = new DataInputStream(...);
byte[] buf = new byte[1024];
int lastRead = 0;
do {
lastRead = dis.read(buf);
//do something with 'buf' here
} while (lastRead > 0);
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