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diff --git a/upb/pb/encoder.h b/upb/pb/encoder.h
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+/*
+ * upb - a minimalist implementation of protocol buffers.
+ *
+ * Copyright (c) 2009-2010 Google Inc.  See LICENSE for details.
+ * Author: Josh Haberman <jhaberman@gmail.com>
+ *
+ * Implements a set of upb_handlers that write protobuf data to the binary wire
+ * format.
+ *
+ * For messages that have any submessages, the encoder needs a buffer
+ * containing the submessage sizes, so they can be properly written at the
+ * front of each message.  Note that groups do *not* have this requirement.
+ */
+
+#ifndef UPB_ENCODER_H_
+#define UPB_ENCODER_H_
+
+#include "upb.h"
+#include "upb_stream.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* upb_encoder ****************************************************************/
+
+// A upb_encoder is a upb_sink that emits data to a upb_bytesink in the protocol
+// buffer binary wire format.
+struct upb_encoder;
+typedef struct upb_encoder upb_encoder;
+
+upb_encoder *upb_encoder_new(upb_msgdef *md);
+void upb_encoder_free(upb_encoder *e);
+
+// Resets the given upb_encoder such that is is ready to begin encoding,
+// outputting data to "bytesink" (which must live until the encoder is
+// reset or destroyed).
+void upb_encoder_reset(upb_encoder *e, upb_bytesink *bytesink);
+
+// Returns the upb_sink to which data can be written.  The sink is invalidated
+// when the encoder is reset or destroyed.  Note that if the client wants to
+// encode any length-delimited submessages it must first call
+// upb_encoder_buildsizes() below.
+upb_sink *upb_encoder_sink(upb_encoder *e);
+
+// Call prior to pushing any data with embedded submessages.  "src" must yield
+// exactly the same data as what will next be encoded, but in reverse order.
+// The encoder iterates over this data in order to determine the sizes of the
+// submessages.  If any errors are returned by the upb_src, the status will
+// be saved in *status.  If the client is sure that the upb_src will not throw
+// any errors, "status" may be NULL.
+void upb_encoder_buildsizes(upb_encoder *e, upb_src *src, upb_status *status);
+
+#ifdef __cplusplus
+}  /* extern "C" */
+#endif
+
+#endif  /* UPB_ENCODER_H_ */