text: /*-
   * Copyright (c) 2003-2017 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(
  	const 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_ */
  