128 lines
4.2 KiB
C
128 lines
4.2 KiB
C
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/*
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* Copyright (c) 2005-2017 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 _PER_SUPPORT_H_
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#define _PER_SUPPORT_H_
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#include <asn_system.h> /* Platform-specific types */
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#include <asn_bit_data.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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/*
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* Pre-computed PER constraints.
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*/
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typedef struct asn_per_constraint_s {
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enum asn_per_constraint_flags {
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APC_UNCONSTRAINED = 0x0, /* No PER visible constraints */
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APC_SEMI_CONSTRAINED = 0x1, /* Constrained at "lb" */
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APC_CONSTRAINED = 0x2, /* Fully constrained */
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APC_EXTENSIBLE = 0x4 /* May have extension */
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} flags;
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int range_bits; /* Full number of bits in the range */
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int effective_bits; /* Effective bits */
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long lower_bound; /* "lb" value */
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long upper_bound; /* "ub" value */
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} asn_per_constraint_t;
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typedef struct asn_per_constraints_s {
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asn_per_constraint_t value;
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asn_per_constraint_t size;
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int (*value2code)(unsigned int value);
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int (*code2value)(unsigned int code);
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} asn_per_constraints_t;
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/* Temporary compatibility layer. Will get removed. */
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typedef struct asn_bit_data_s asn_per_data_t;
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#define per_get_few_bits(data, bits) asn_get_few_bits(data, bits)
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#define per_get_undo(data, bits) asn_get_undo(data, bits)
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#define per_get_many_bits(data, dst, align, bits) \
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asn_get_many_bits(data, dst, align, bits)
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/*
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* X.691 (08/2015) #11.9 "General rules for encoding a length determinant"
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* Get the length "n" from the Unaligned PER stream.
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*/
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ssize_t uper_get_length(asn_per_data_t *pd, int effective_bound_bits,
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size_t lower_bound, int *repeat);
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ssize_t aper_get_length(asn_per_data_t *pd, int range,
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int effective_bound_bits, int *repeat);
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/*
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* Get the normally small length "n".
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*/
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ssize_t uper_get_nslength(asn_per_data_t *pd);
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ssize_t aper_get_nslength(asn_per_data_t *pd);
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/*
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* Get the normally small non-negative whole number.
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*/
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ssize_t uper_get_nsnnwn(asn_per_data_t *pd);
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ssize_t aper_get_nsnnwn(asn_per_data_t *pd, int range);
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/* X.691-2008/11, #11.5.6 */
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int uper_get_constrained_whole_number(asn_per_data_t *pd, unsigned long *v, int nbits);
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/* Temporary compatibility layer. Will get removed. */
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typedef struct asn_bit_outp_s asn_per_outp_t;
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#define per_put_few_bits(out, bits, obits) asn_put_few_bits(out, bits, obits)
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#define per_put_many_bits(out, src, nbits) asn_put_many_bits(out, src, nbits)
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#define per_put_aligned_flush(out) asn_put_aligned_flush(out)
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/*
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* Rebase the given value as an offset into the range specified by the
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* lower bound (lb) and upper bound (ub).
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* RETURN VALUES:
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* -1: Conversion failed due to range problems.
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* 0: Conversion was successful.
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*/
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int per_long_range_rebase(long v, long lb, long ub, unsigned long *output);
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/* The inverse operation: restores the value by the offset and its bounds. */
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int per_long_range_unrebase(unsigned long inp, long lb, long ub, long *outp);
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/* X.691-2008/11, #11.5 */
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int uper_put_constrained_whole_number_u(asn_per_outp_t *po, unsigned long v, int nbits);
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/*
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* X.691 (08/2015) #11.9 "General rules for encoding a length determinant"
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* Put the length "whole_length" to the Unaligned PER stream.
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* If (opt_need_eom) is given, it will be set to 1 if final 0-length is needed.
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* In that case, invoke uper_put_length(po, 0, 0) after encoding the last block.
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* This function returns the number of units which may be flushed
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* in the next units saving iteration.
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*/
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ssize_t uper_put_length(asn_per_outp_t *po, size_t whole_length,
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int *opt_need_eom);
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ssize_t aper_put_length(asn_per_outp_t *po, int range, size_t length);
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/* Align the current bit position to octet bundary */
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int aper_put_align(asn_per_outp_t *po);
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int32_t aper_get_align(asn_per_data_t *pd);
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/*
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* Put the normally small length "n" to the Unaligned PER stream.
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* Returns 0 or -1.
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*/
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int uper_put_nslength(asn_per_outp_t *po, size_t length);
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int aper_put_nslength(asn_per_outp_t *po, size_t length);
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/*
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* Put the normally small non-negative whole number.
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*/
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int uper_put_nsnnwn(asn_per_outp_t *po, int n);
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int aper_put_nsnnwn(asn_per_outp_t *po, int range, int number);
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#ifdef __cplusplus
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}
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#endif
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#endif /* _PER_SUPPORT_H_ */
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