--- /dev/null
+/*
+** upb::pb::Encoder (upb_pb_encoder)
+**
+** Implements a set of upb_handlers that write protobuf data to the binary wire
+** format.
+**
+** This encoder implementation does not have any access to any out-of-band or
+** precomputed lengths for submessages, so it must buffer submessages internally
+** before it can emit the first byte.
+*/
+
+#ifndef UPB_ENCODER_H_
+#define UPB_ENCODER_H_
+
+#include "upb/sink.h"
+
+#ifdef __cplusplus
+namespace upb {
+namespace pb {
+class EncoderPtr;
+} /* namespace pb */
+} /* namespace upb */
+#endif
+
+#define UPB_PBENCODER_MAX_NESTING 100
+
+/* upb_pb_encoder *************************************************************/
+
+/* Preallocation hint: decoder won't allocate more bytes than this when first
+ * constructed. This hint may be an overestimate for some build configurations.
+ * But if the decoder library is upgraded without recompiling the application,
+ * it may be an underestimate. */
+#define UPB_PB_ENCODER_SIZE 784
+
+struct upb_pb_encoder;
+typedef struct upb_pb_encoder upb_pb_encoder;
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+upb_sink upb_pb_encoder_input(upb_pb_encoder *p);
+upb_pb_encoder* upb_pb_encoder_create(upb_arena* a, const upb_handlers* h,
+ upb_bytessink output);
+
+/* Lazily builds and caches handlers that will push encoded data to a bytessink.
+ * Any msgdef objects used with this object must outlive it. */
+upb_handlercache *upb_pb_encoder_newcache(void);
+
+#ifdef __cplusplus
+} /* extern "C" { */
+
+class upb::pb::EncoderPtr {
+ public:
+ EncoderPtr(upb_pb_encoder* ptr) : ptr_(ptr) {}
+
+ upb_pb_encoder* ptr() { return ptr_; }
+
+ /* Creates a new encoder in the given environment. The Handlers must have
+ * come from NewHandlers() below. */
+ static EncoderPtr Create(Arena* arena, const Handlers* handlers,
+ BytesSink output) {
+ return EncoderPtr(
+ upb_pb_encoder_create(arena->ptr(), handlers, output.sink()));
+ }
+
+ /* The input to the encoder. */
+ upb::Sink input() { return upb_pb_encoder_input(ptr()); }
+
+ /* Creates a new set of handlers for this MessageDef. */
+ static HandlerCache NewCache() {
+ return HandlerCache(upb_pb_encoder_newcache());
+ }
+
+ static const size_t kSize = UPB_PB_ENCODER_SIZE;
+
+ private:
+ upb_pb_encoder* ptr_;
+};
+
+#endif /* __cplusplus */
+
+#endif /* UPB_ENCODER_H_ */