X-Git-Url: https://git.stg.codes/stg.git/blobdiff_plain/8c6fa3fbaccc22127280bf77a48fab5a3ee0716e..46b0747592074017ff0ea4b33d4a7194235886e5:/libs/smux/include/stg/ber_tlv_length.h

diff --git a/libs/smux/include/stg/ber_tlv_length.h b/libs/smux/include/stg/ber_tlv_length.h
new file mode 100644
index 00000000..34968022
--- /dev/null
+++ b/libs/smux/include/stg/ber_tlv_length.h
@@ -0,0 +1,50 @@
+/*-
+ * Copyright (c) 2003 Lev Walkin <vlm@lionet.info>. All rights reserved.
+ * Redistribution and modifications are permitted subject to BSD license.
+ */
+#ifndef	_BER_TLV_LENGTH_H_
+#define	_BER_TLV_LENGTH_H_
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+typedef ssize_t ber_tlv_len_t;
+
+/*
+ * This function tries to fetch the length of the BER TLV value and place it
+ * in *len_r.
+ * RETURN VALUES:
+ *	 0:	More data expected than bufptr contains.
+ *	-1:	Fatal error deciphering length.
+ *	>0:	Number of bytes used from bufptr.
+ * On return with >0, len_r is constrained as -1..MAX, where -1 mean
+ * that the value is of indefinite length.
+ */
+ssize_t ber_fetch_length(int _is_constructed, const void *bufptr, size_t size,
+	ber_tlv_len_t *len_r);
+
+/*
+ * This function expects bufptr to be positioned over L in TLV.
+ * It returns number of bytes occupied by L and V together, suitable
+ * for skipping. The function properly handles indefinite length.
+ * RETURN VALUES:
+ * 	Standard {-1,0,>0} convention.
+ */
+ssize_t ber_skip_length(
+	struct asn_codec_ctx_s *opt_codec_ctx,	/* optional context */
+	int _is_constructed, const void *bufptr, size_t size);
+
+/*
+ * This function serializes the length (L from TLV) in DER format.
+ * It always returns number of bytes necessary to represent the length,
+ * it is a caller's responsibility to check the return value
+ * against the supplied buffer's size.
+ */
+size_t der_tlv_length_serialize(ber_tlv_len_t len, void *bufptr, size_t size);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif	/* _BER_TLV_LENGTH_H_ */