Use a compiler to marshall/unmarshall the sessions

This way changes are easier, all is needed is to change the session.asn1
file to add or remove elements, and different session types can also be
supported at the same time.

1 files changed, 68 insertions, 0 deletions

diff --git a/src/asn1c/der_encoder.h b/src/asn1c/der_encoder.h
new file mode 100644
index 0000000..61431c6
--- /dev/null
+++ b/src/asn1c/der_encoder.h
@@ -0,0 +1,68 @@
+/*-
+ * Copyright (c) 2003, 2004 Lev Walkin <vlm@lionet.info>. All rights reserved.
+ * Redistribution and modifications are permitted subject to BSD license.
+ */
+#ifndef	_DER_ENCODER_H_
+#define	_DER_ENCODER_H_
+
+#include <asn_application.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+struct asn_TYPE_descriptor_s;	/* Forward declaration */
+
+/*
+ * The DER encoder of any type. May be invoked by the application.
+ * The ber_decode() function (ber_decoder.h) is an opposite of der_encode().
+ */
+asn_enc_rval_t der_encode(struct asn_TYPE_descriptor_s *type_descriptor,
+		void *struct_ptr,	/* Structure to be encoded */
+		asn_app_consume_bytes_f *consume_bytes_cb,
+		void *app_key		/* Arbitrary callback argument */
+	);
+
+/* A variant of der_encode() which encodes data into the pre-allocated buffer */
+asn_enc_rval_t der_encode_to_buffer(
+		struct asn_TYPE_descriptor_s *type_descriptor,
+		void *struct_ptr,	/* Structure to be encoded */
+		void *buffer,		/* Pre-allocated buffer */
+		size_t buffer_size	/* Initial buffer size (maximum) */
+	);
+
+/*
+ * Type of the generic DER encoder.
+ */
+typedef asn_enc_rval_t (der_type_encoder_f)(
+		struct asn_TYPE_descriptor_s *type_descriptor,
+		void *struct_ptr,	/* Structure to be encoded */
+		int tag_mode,		/* {-1,0,1}: IMPLICIT, no, EXPLICIT */
+		ber_tlv_tag_t tag,
+		asn_app_consume_bytes_f *consume_bytes_cb,	/* Callback */
+		void *app_key		/* Arbitrary callback argument */
+	);
+
+
+/*******************************
+ * INTERNALLY USEFUL FUNCTIONS *
+ *******************************/
+
+/*
+ * Write out leading TL[v] sequence according to the type definition.
+ */
+ssize_t der_write_tags(
+		struct asn_TYPE_descriptor_s *type_descriptor,
+		size_t struct_length,
+		int tag_mode,		/* {-1,0,1}: IMPLICIT, no, EXPLICIT */
+		int last_tag_form,	/* {0,!0}: prim, constructed */
+		ber_tlv_tag_t tag,
+		asn_app_consume_bytes_f *consume_bytes_cb,
+		void *app_key
+	);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif	/* _DER_ENCODER_H_ */