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diff --git a/upb/descriptor/reader.h b/upb/descriptor/reader.h
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+/*
+ * upb - a minimalist implementation of protocol buffers.
+ *
+ * Copyright (c) 2011 Google Inc.  See LICENSE for details.
+ * Author: Josh Haberman <jhaberman@gmail.com>
+ *
+ * upb_descreader provides a set of sink handlers that will build defs from a
+ * data source that uses the descriptor.proto schema (like a protobuf binary
+ * descriptor).
+ */
+
+#ifndef UPB_DESCRIPTOR_H
+#define UPB_DESCRIPTOR_H
+
+#include "upb/handlers.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* upb_deflist ****************************************************************/
+
+// upb_deflist is an internal-only dynamic array for storing a growing list of
+// upb_defs.
+typedef struct {
+  upb_def **defs;
+  size_t len;
+  size_t size;
+  bool owned;
+} upb_deflist;
+
+void upb_deflist_init(upb_deflist *l);
+void upb_deflist_uninit(upb_deflist *l);
+void upb_deflist_push(upb_deflist *l, upb_def *d);
+
+/* upb_descreader  ************************************************************/
+
+// We keep a stack of all the messages scopes we are currently in, as well as
+// the top-level file scope.  This is necessary to correctly qualify the
+// definitions that are contained inside.  "name" tracks the name of the
+// message or package (a bare name -- not qualified by any enclosing scopes).
+typedef struct {
+  char *name;
+  // Index of the first def that is under this scope.  For msgdefs, the
+  // msgdef itself is at start-1.
+  int start;
+} upb_descreader_frame;
+
+typedef struct {
+  upb_deflist defs;
+  upb_descreader_frame stack[UPB_MAX_TYPE_DEPTH];
+  int stack_len;
+  upb_status status;
+
+  uint32_t number;
+  char *name;
+  bool saw_number;
+  bool saw_name;
+
+  char *default_string;
+
+  upb_fielddef *f;
+} upb_descreader;
+
+void upb_descreader_init(upb_descreader *r);
+void upb_descreader_uninit(upb_descreader *r);
+
+// Registers handlers that will build the defs.  Pass the descreader as the
+// closure.
+upb_mhandlers *upb_descreader_reghandlers(upb_handlers *h);
+
+// Gets the array of defs that have been parsed and removes them from the
+// descreader.  Ownership of the defs is passed to the caller using the given
+// owner), but the ownership of the returned array is retained and is
+// invalidated by any other call into the descreader.  The defs will not have
+// been resolved, and are ready to be added to a symtab.
+upb_def **upb_descreader_getdefs(upb_descreader *r, void *owner, int *n);
+
+#ifdef __cplusplus
+}  /* extern "C" */
+#endif
+
+#endif