Basic support for datagram messaging. Hope I haven't fucked

anything up!


git-svn-id: svn+ssh://src.earth.threerings.net/narya/trunk@5090 542714f4-19e9-0310-aa3c-eee0fc999fb1

src/java/com/threerings/io/ByteBufferInputStream.java

@@ -0,0 +1,97 @@
+//
+// $Id$
+
+package com.threerings.io;
+
+import java.io.IOException;
+import java.io.InputStream;
+
+import java.nio.BufferUnderflowException;
+import java.nio.ByteBuffer;
+import java.nio.InvalidMarkException;
+
+/**
+ * Reads input from a {@link ByteBuffer}.
+ */
+public class ByteBufferInputStream extends InputStream
+{
+    /**
+     * Creates a new input stream to read from the specified buffer.
+     */
+    public ByteBufferInputStream (ByteBuffer buffer)
+    {
+        _buffer = buffer;
+    }
+
+    /**
+     * Returns a reference to the underlying buffer.
+     */
+    public ByteBuffer getBuffer ()
+    {
+        return _buffer;
+    }
+
+    @Override // documentation inherited
+    public int read ()
+    {
+        try {
+            return (_buffer.get() & 0xFF);
+        } catch (BufferUnderflowException e) {
+            return -1;
+        }
+    }
+
+    @Override // documentation inherited
+    public int read (byte[] b, int offset, int length)
+        throws IOException
+    {
+        length = Math.min(length, _buffer.remaining());
+        if (length <= 0) {
+            return -1;
+        }
+        _buffer.get(b, offset, length);
+        return length;
+    }
+
+    @Override // documentation inherited
+    public long skip (long n)
+        throws IOException
+    {
+        n = Math.min(n, _buffer.remaining());
+        _buffer.position((int)(_buffer.position() + n));
+        return n;
+    }
+
+    @Override // documentation inherited
+    public int available ()
+    {
+        return _buffer.remaining();
+    }
+
+    @Override // documentation inherited
+    public boolean markSupported ()
+    {
+        return true;
+    }
+
+    @Override // documentation inherited
+    public void mark (int readLimit)
+    {
+        _buffer.mark();
+    }
+
+    @Override // documentation inherited
+    public void reset ()
+        throws IOException
+    {
+        try {
+            _buffer.reset();
+        } catch (InvalidMarkException e) {
+            throw new IOException("No mark set.");
+        }
+    }
+
+    /** The buffer from which we read. */
+    protected ByteBuffer _buffer;
+}
+