Harald Welte | d523a69 | 2015-08-30 23:11:19 +0200 | [diff] [blame] | 1 | /*- |
| 2 | * Copyright (c) 2003 Lev Walkin <vlm@lionet.info>. All rights reserved. |
| 3 | * Redistribution and modifications are permitted subject to BSD license. |
| 4 | */ |
| 5 | #ifndef _BER_TLV_LENGTH_H_ |
| 6 | #define _BER_TLV_LENGTH_H_ |
| 7 | |
| 8 | #ifdef __cplusplus |
| 9 | extern "C" { |
| 10 | #endif |
| 11 | |
| 12 | typedef ssize_t ber_tlv_len_t; |
| 13 | |
| 14 | /* |
| 15 | * This function tries to fetch the length of the BER TLV value and place it |
| 16 | * in *len_r. |
| 17 | * RETURN VALUES: |
| 18 | * 0: More data expected than bufptr contains. |
| 19 | * -1: Fatal error deciphering length. |
| 20 | * >0: Number of bytes used from bufptr. |
| 21 | * On return with >0, len_r is constrained as -1..MAX, where -1 mean |
| 22 | * that the value is of indefinite length. |
| 23 | */ |
| 24 | ssize_t ber_fetch_length(int _is_constructed, const void *bufptr, size_t size, |
| 25 | ber_tlv_len_t *len_r); |
| 26 | |
| 27 | /* |
| 28 | * This function expects bufptr to be positioned over L in TLV. |
| 29 | * It returns number of bytes occupied by L and V together, suitable |
| 30 | * for skipping. The function properly handles indefinite length. |
| 31 | * RETURN VALUES: |
| 32 | * Standard {-1,0,>0} convention. |
| 33 | */ |
| 34 | ssize_t ber_skip_length( |
| 35 | struct asn_codec_ctx_s *opt_codec_ctx, /* optional context */ |
| 36 | int _is_constructed, const void *bufptr, size_t size); |
| 37 | |
| 38 | /* |
| 39 | * This function serializes the length (L from TLV) in DER format. |
| 40 | * It always returns number of bytes necessary to represent the length, |
| 41 | * it is a caller's responsibility to check the return value |
| 42 | * against the supplied buffer's size. |
| 43 | */ |
| 44 | size_t der_tlv_length_serialize(ber_tlv_len_t len, void *bufptr, size_t size); |
| 45 | |
| 46 | #ifdef __cplusplus |
| 47 | } |
| 48 | #endif |
| 49 | |
| 50 | #endif /* _BER_TLV_LENGTH_H_ */ |