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1.5 KiB

* Copyright (c) 2003 Lev Walkin <>. 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" {
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.
* 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.
* 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 /* _BER_TLV_LENGTH_H_ */