1 files changed, 60 insertions, 0 deletions
diff --git a/upb_enum.h b/upb_enum.h
new file mode 100644
index 0000000..2c4010b
--- /dev/null
+++ b/upb_enum.h
@@ -0,0 +1,60 @@
+/*
+ * upb - a minimalist implementation of protocol buffers.
+ *
+ * Copyright (c) 2009 Joshua Haberman.  See LICENSE for details.
+ *
+ * upb_enum is a simple object that allows run-time reflection over the values
+ * defined within an enum. */
+
+#ifndef UPB_ENUM_H_
+#define UPB_ENUM_H_
+
+#include <stdint.h>
+#include "upb_table.h"
+
+/* Forward declaration from descriptor.h. */
+struct google_protobuf_EnumDescriptorProto;
+struct google_protobuf_EnumValueDescriptorProto;
+
+struct upb_enum {
+  struct google_protobuf_EnumDescriptorProto *descriptor;
+  struct upb_strtable nametoint;
+  struct upb_inttable inttoname;
+};
+
+struct upb_enum_ntoi_entry {
+  struct upb_strtable_entry e;
+  uint32_t value;
+};
+
+struct upb_enum_iton_entry {
+  struct upb_inttable_entry e;
+  struct upb_string *string;
+};
+
+/* Initializes and frees an enum, respectively.  Caller retains ownership of
+ * ed, but it must outlive e. */
+INLINE void upb_enum_init(struct upb_enum *e,
+                          struct google_protobuf_EnumDescriptorProto *ed) {
+  int num_values = ed->set_flags.has.value ? ed->value->len : 0;
+  e->descriptor = ed;
+  upb_strtable_init(&e->nametoint, num_values, sizeof(struct upb_enum_ntoi_entry));
+  upb_inttable_init(&e->inttoname, num_values, sizeof(struct upb_enum_iton_entry));
+
+  for(int i = 0; i < num_values; i++) {
+    google_protobuf_EnumValueDescriptorProto *value = ed->value->elements[i];
+    struct upb_enum_ntoi_entry ntoi_entry = {.e = {.key = *value->name},
+                                             .value = value->number};
+    struct upb_enum_iton_entry iton_entry = {.e = {.key = value->number},
+                                             .string = value->name};
+    upb_strtable_insert(&e->nametoint, &ntoi_entry.e);
+    upb_inttable_insert(&e->inttoname, &iton_entry.e);
+  }
+}
+
+INLINE void upb_enum_free(struct upb_enum *e) {
+  upb_strtable_free(&e->nametoint);
+  upb_inttable_free(&e->inttoname);
+}
+
+#endif  /* UPB_ENUM_H_ */