Update data format to match BDF spec.

briar-api/src/org/briarproject/api/data/BdfWriter.java

@@ -0,0 +1,29 @@
+package org.briarproject.api.data;
+
+import java.io.IOException;
+import java.util.Collection;
+import java.util.Map;
+
+public interface BdfWriter {
+
+	void flush() throws IOException;
+	void close() throws IOException;
+
+	void addConsumer(Consumer c);
+	void removeConsumer(Consumer c);
+
+	void writeNull() throws IOException;
+	void writeBoolean(boolean b) throws IOException;
+	void writeInteger(long l) throws IOException;
+	void writeFloat(double d) throws IOException;
+	void writeString(String s) throws IOException;
+	void writeRaw(byte[] b) throws IOException;
+
+	void writeList(Collection<?> c) throws IOException;
+	void writeListStart() throws IOException;
+	void writeListEnd() throws IOException;
+
+	void writeDictionary(Map<?, ?> m) throws IOException;
+	void writeDictionaryStart() throws IOException;
+	void writeDictionaryEnd() throws IOException;
+}