OggPacketWriter getter for current unflushed page size

Allow access to the size, including header, of the current unflushed
page. Based on 9d2be26 from @andrm

Author: Gagravarr

core/src/main/java/org/gagravarr/ogg/OggPacketWriter.java

@@ -143,6 +143,20 @@ public int getSizePendingFlush() {
         return size;
     }
 
+    /**
+     * Returns the size of the page currently being written
+     *  to, including its headers.
+     * For a new stream, or a stream that has just been
+     *  flushed, will return zero.
+     * @return Current page size, or 0 if no current page
+     */
+    public int getCurrentPageSize() {
+        if (buffer.isEmpty()) return 0;
+
+        OggPage p = buffer.get( buffer.size()-1 );
+        return p.getPageSize();
+    }
+
     /**
      * Writes all pending packets to the stream,
      *  splitting across pages as needed.

core/src/test/java/org/gagravarr/ogg/TestBasicWrite.java

@@ -91,12 +91,16 @@ public void testEmptyPages() throws IOException {
         // Add an empty packet
         p = new OggPacket(new byte[0]);
         w.bufferPacket(p);
+        assertEquals(0, w.getSizePendingFlush()); // Excludes headers
+        assertEquals(28, w.getCurrentPageSize()); // Includes
         w.flush();
 
         // And a packet with something in it,
         //  and with a granule position
         p = new OggPacket(new byte[] {22});
         w.bufferPacket(p, 54321l);
+        assertEquals(1, w.getSizePendingFlush()); // Excludes headers
+        assertEquals(29, w.getCurrentPageSize()); // Includes
         w.close();
 
         // Check again
@@ -111,6 +115,7 @@ public void testEmptyPages() throws IOException {
         assertEquals(0, p.getGranulePosition());
         assertEquals(0, p.getSequenceNumber());
         assertEquals(0, p.getData().length);
+        assertEquals(28, p.getOverheadBytes());
 
         p = r.getNextPacket();
         assertNotNull(p);
@@ -120,6 +125,7 @@ public void testEmptyPages() throws IOException {
         assertEquals(0, p.getGranulePosition());
         assertEquals(0, p.getSequenceNumber());
         assertEquals(0, p.getData().length);
+        assertEquals(28, p.getOverheadBytes());
 
         p = r.getNextPacket();
         assertNotNull(p);
@@ -129,6 +135,7 @@ public void testEmptyPages() throws IOException {
         assertEquals(54321l, p.getGranulePosition());
         assertEquals(1, p.getSequenceNumber());
         assertEquals(1, p.getData().length);
+        assertEquals(28, p.getOverheadBytes());
 
         assertNull(r.getNextPacket());
     }