3 * Copyright (c) 2005-2017 Lev Walkin <vlm@lionet.info>. All rights reserved.
4 * Redistribution and modifications are permitted subject to BSD license.
6 #ifndef _PER_SUPPORT_H_
7 #define _PER_SUPPORT_H_
9 #include <asn_system.h> /* Platform-specific types */
10 #include <asn_bit_data.h>
17 * Pre-computed PER constraints.
19 typedef struct asn_per_constraint_s {
20 enum asn_per_constraint_flags {
21 APC_UNCONSTRAINED = 0x0, /* No PER visible constraints */
22 APC_SEMI_CONSTRAINED = 0x1, /* Constrained at "lb" */
23 APC_CONSTRAINED = 0x2, /* Fully constrained */
24 APC_EXTENSIBLE = 0x4 /* May have extension */
26 int range_bits; /* Full number of bits in the range */
27 int effective_bits; /* Effective bits */
28 long lower_bound; /* "lb" value */
29 long upper_bound; /* "ub" value */
30 } asn_per_constraint_t;
31 typedef struct asn_per_constraints_s {
32 asn_per_constraint_t value;
33 asn_per_constraint_t size;
34 int (*value2code)(unsigned int value);
35 int (*code2value)(unsigned int code);
36 } asn_per_constraints_t;
38 /* Temporary compatibility layer. Will get removed. */
39 typedef struct asn_bit_data_s asn_per_data_t;
40 #define per_get_few_bits(data, bits) asn_get_few_bits(data, bits)
41 #define per_get_undo(data, bits) asn_get_undo(data, bits)
42 #define per_get_many_bits(data, dst, align, bits) \
43 asn_get_many_bits(data, dst, align, bits)
46 * X.691 (08/2015) #11.9 "General rules for encoding a length determinant"
47 * Get the length "n" from the Unaligned PER stream.
49 ssize_t uper_get_length(asn_per_data_t *pd, int effective_bound_bits,
50 size_t lower_bound, int *repeat);
52 ssize_t aper_get_length(asn_per_data_t *pd, int range,
53 int effective_bound_bits, int *repeat);
56 * Get the normally small length "n".
58 ssize_t uper_get_nslength(asn_per_data_t *pd);
59 ssize_t aper_get_nslength(asn_per_data_t *pd);
62 * Get the normally small non-negative whole number.
64 ssize_t uper_get_nsnnwn(asn_per_data_t *pd);
65 ssize_t aper_get_nsnnwn(asn_per_data_t *pd, int range);
67 /* X.691-2008/11, #11.5.6 */
68 int uper_get_constrained_whole_number(asn_per_data_t *pd, unsigned long *v, int nbits);
71 /* Temporary compatibility layer. Will get removed. */
72 typedef struct asn_bit_outp_s asn_per_outp_t;
73 #define per_put_few_bits(out, bits, obits) asn_put_few_bits(out, bits, obits)
74 #define per_put_many_bits(out, src, nbits) asn_put_many_bits(out, src, nbits)
75 #define per_put_aligned_flush(out) asn_put_aligned_flush(out)
79 * Rebase the given value as an offset into the range specified by the
80 * lower bound (lb) and upper bound (ub).
82 * -1: Conversion failed due to range problems.
83 * 0: Conversion was successful.
85 int per_long_range_rebase(long v, long lb, long ub, unsigned long *output);
86 /* The inverse operation: restores the value by the offset and its bounds. */
87 int per_long_range_unrebase(unsigned long inp, long lb, long ub, long *outp);
89 /* X.691-2008/11, #11.5 */
90 int uper_put_constrained_whole_number_u(asn_per_outp_t *po, unsigned long v, int nbits);
93 * X.691 (08/2015) #11.9 "General rules for encoding a length determinant"
94 * Put the length "whole_length" to the Unaligned PER stream.
95 * If (opt_need_eom) is given, it will be set to 1 if final 0-length is needed.
96 * In that case, invoke uper_put_length(po, 0, 0) after encoding the last block.
97 * This function returns the number of units which may be flushed
98 * in the next units saving iteration.
100 ssize_t uper_put_length(asn_per_outp_t *po, size_t whole_length,
103 ssize_t aper_put_length(asn_per_outp_t *po, int range, size_t length);
105 /* Align the current bit position to octet bundary */
106 int aper_put_align(asn_per_outp_t *po);
107 int32_t aper_get_align(asn_per_data_t *pd);
110 * Put the normally small length "n" to the Unaligned PER stream.
113 int uper_put_nslength(asn_per_outp_t *po, size_t length);
115 int aper_put_nslength(asn_per_outp_t *po, size_t length);
118 * Put the normally small non-negative whole number.
120 int uper_put_nsnnwn(asn_per_outp_t *po, int n);
122 int aper_put_nsnnwn(asn_per_outp_t *po, int range, int number);
128 #endif /* _PER_SUPPORT_H_ */