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diff --git a/g13/g13tuple.h b/g13/g13tuple.h
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+/* g13tuple.h - Tuple handling
+ * Copyright (C) 2009 Free Software Foundation, Inc.
+ *
+ * This file is part of GnuPG.
+ *
+ * GnuPG is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * GnuPG is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see <https://www.gnu.org/licenses/>.
+ */
+
+#ifndef G13_G13TUPLE_H
+#define G13_G13TUPLE_H
+
+#include "../common/membuf.h"
+
+/* Append a new tuple to a memory buffer.  */
+void append_tuple (membuf_t *membuf,
+                   int tag, const void *value, size_t length);
+void append_tuple_uint (membuf_t *membuf, int tag,
+                        unsigned long long value);
+
+/* The tuple descriptor object. */
+struct tupledesc_s;
+typedef struct tupledesc_s *tupledesc_t;
+
+gpg_error_t create_tupledesc (tupledesc_t *r_tupledesc,
+                              void *data, size_t datalen);
+void destroy_tupledesc (tupledesc_t tupledesc);
+tupledesc_t ref_tupledesc (tupledesc_t tupledesc);
+#define unref_tupledesc(a) destroy_tupledesc ((a))
+const void *get_tupledesc_data (tupledesc_t tupledesc, size_t *r_datalen);
+
+const void *find_tuple (tupledesc_t tupledesc,
+                        unsigned int tag, size_t *r_length);
+gpg_error_t find_tuple_uint (tupledesc_t tupledesc, unsigned int tag,
+                             unsigned long long *r_value);
+const void *next_tuple (tupledesc_t tupledesc,
+                        unsigned int *r_tag, size_t *r_length);
+
+void dump_tupledesc (tupledesc_t tuples);
+
+
+#endif /*G13_G13TUPLE_H*/