51 lines
1.5 KiB
C
51 lines
1.5 KiB
C
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/*-
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* Copyright (c) 2003-2017 Lev Walkin <vlm@lionet.info>. All rights reserved.
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* Redistribution and modifications are permitted subject to BSD license.
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*/
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#ifndef _BER_TLV_LENGTH_H_
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#define _BER_TLV_LENGTH_H_
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#ifdef __cplusplus
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extern "C" {
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#endif
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typedef ssize_t ber_tlv_len_t;
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/*
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* This function tries to fetch the length of the BER TLV value and place it
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* in *len_r.
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* RETURN VALUES:
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* 0: More data expected than bufptr contains.
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* -1: Fatal error deciphering length.
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* >0: Number of bytes used from bufptr.
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* On return with >0, len_r is constrained as -1..MAX, where -1 mean
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* that the value is of indefinite length.
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*/
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ssize_t ber_fetch_length(int _is_constructed, const void *bufptr, size_t size,
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ber_tlv_len_t *len_r);
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/*
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* This function expects bufptr to be positioned over L in TLV.
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* It returns number of bytes occupied by L and V together, suitable
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* for skipping. The function properly handles indefinite length.
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* RETURN VALUES:
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* Standard {-1,0,>0} convention.
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*/
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ssize_t ber_skip_length(
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const struct asn_codec_ctx_s *opt_codec_ctx, /* optional context */
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int _is_constructed, const void *bufptr, size_t size);
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/*
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* This function serializes the length (L from TLV) in DER format.
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* It always returns number of bytes necessary to represent the length,
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* it is a caller's responsibility to check the return value
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* against the supplied buffer's size.
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*/
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size_t der_tlv_length_serialize(ber_tlv_len_t len, void *bufptr, size_t size);
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#ifdef __cplusplus
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}
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#endif
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#endif /* _BER_TLV_LENGTH_H_ */
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