New files, implementing an sexp-parser.

Rev: src/nettle/sexp.c:1.1
Rev: src/nettle/sexp.h:1.1

1 files changed, 87 insertions, 0 deletions

diff --git a/sexp.h b/sexp.h
new file mode 100644
index 00000000..b751b0c2
--- /dev/null
+++ b/sexp.h
@@ -0,0 +1,87 @@
+/* sexp.h
+ *
+ * Parsing s-expressions.
+ */
+
+/* nettle, low-level cryptographics library
+ *
+ * Copyright (C) 2002 Niels Möller
+ *  
+ * The nettle library is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation; either version 2.1 of the License, or (at your
+ * option) any later version.
+ * 
+ * The nettle library 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 Lesser General Public
+ * License for more details.
+ * 
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with the nettle library; see the file COPYING.LIB.  If not, write to
+ * the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
+ * MA 02111-1307, USA.
+ */
+ 
+#ifndef NETTLE_SEXP_H_INCLUDED
+#define NETTLE_SEXP_H_INCLUDED
+
+#include <inttypes.h>
+
+enum sexp_type
+  { SEXP_START, SEXP_ATOM, SEXP_LIST, SEXP_END };
+
+struct sexp_iterator
+{
+  unsigned length;
+  const uint8_t *buffer;
+  unsigned pos;
+  unsigned level;
+
+  enum sexp_type type;
+  
+  unsigned display_length;
+  const uint8_t *display;
+
+  unsigned atom_length;
+  const uint8_t *atom;
+};
+
+struct sexp_assoc_key
+{
+  unsigned length;
+  const uint8_t *name;
+};
+
+/* Initializes the iterator. You have to call next to get to the first
+ * element. */
+void
+sexp_iterator_init(struct sexp_iterator *iterator,
+		   unsigned length, const uint8_t *input);
+
+/* All these functions return 1 on success, 0 on failure */
+int
+sexp_iterator_next(struct sexp_iterator *iterator);
+
+/* Current element must be a list. */
+int
+sexp_iterator_enter_list(struct sexp_iterator *iterator);
+
+/* Skips the rest of the current list */
+int
+sexp_iterator_exit_list(struct sexp_iterator *iterator);
+
+/* Current element must be a list. Looks up element of type
+ *
+ *   (key rest...)
+ *
+ * For a matching key, the corersponding iterator is initialized
+ * pointing at the start of REST.
+ */
+int
+sexp_iterator_assoc(struct sexp_iterator *iterator,
+		    unsigned nkeys,
+		    const struct sexp_assoc_key *keys,
+		    struct sexp_iterator *values);
+
+#endif /* NETTLE_SEXP_H_INCLUDED */