1 files changed, 67 insertions, 0 deletions
diff --git a/src/upb_descriptor.h b/src/upb_descriptor.h
new file mode 100644
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+++ b/src/upb_descriptor.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>
+ *
+ * Routines for building defs by parsing descriptors in descriptor.proto format.
+ * This only needs to use the public API of upb_symtab.  Later we may also
+ * add routines for dumping a symtab to a descriptor.
+ */
+
+#ifndef UPB_DESCRIPTOR_H
+#define UPB_DESCRIPTOR_H
+
+#include "upb_handlers.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+
+/* upb_descreader  ************************************************************/
+
+// upb_descreader reads a descriptor and puts defs in a upb_symtabtxn.
+
+// 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 {
+  upb_string *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_symtabtxn *txn;
+  upb_descreader_frame stack[UPB_MAX_TYPE_DEPTH];
+  int stack_len;
+  upb_status status;
+
+  uint32_t number;
+  upb_string *name;
+  bool saw_number;
+  bool saw_name;
+
+  upb_string *default_string;
+
+  upb_fielddef *f;
+} upb_descreader;
+
+// Creates a new descriptor builder that will add defs to the given txn.
+void upb_descreader_init(upb_descreader *r, upb_symtabtxn *txn);
+void upb_descreader_uninit(upb_descreader *r);
+
+// Registers handlers that will load descriptor data into a symtabtxn.
+// Pass the descreader as the closure.  The messages will have
+// upb_msgdef_layout() called on them before adding to the txn.
+upb_mhandlers *upb_descreader_reghandlers(upb_handlers *h);
+
+#ifdef __cplusplus
+}  /* extern "C" */
+#endif
+
+#endif