1 /*****************************************************************************
3 # Copyright 2019 AT&T Intellectual Property *
5 # Licensed under the Apache License, Version 2.0 (the "License"); *
6 # you may not use this file except in compliance with the License. *
7 # You may obtain a copy of the License at *
9 # http://www.apache.org/licenses/LICENSE-2.0 *
11 # Unless required by applicable law or agreed to in writing, software *
12 # distributed under the License is distributed on an "AS IS" BASIS, *
13 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. *
14 # See the License for the specific language governing permissions and *
15 # limitations under the License. *
17 ******************************************************************************/
20 * Copyright (c) 2005-2017 Lev Walkin <vlm@lionet.info>. All rights reserved.
21 * Redistribution and modifications are permitted subject to BSD license.
23 #ifndef _PER_SUPPORT_H_
24 #define _PER_SUPPORT_H_
26 #include <asn_system.h> /* Platform-specific types */
27 #include <asn_bit_data.h>
34 * Pre-computed PER constraints.
36 typedef struct asn_per_constraint_s {
37 enum asn_per_constraint_flags {
38 APC_UNCONSTRAINED = 0x0, /* No PER visible constraints */
39 APC_SEMI_CONSTRAINED = 0x1, /* Constrained at "lb" */
40 APC_CONSTRAINED = 0x2, /* Fully constrained */
41 APC_EXTENSIBLE = 0x4 /* May have extension */
43 int range_bits; /* Full number of bits in the range */
44 int effective_bits; /* Effective bits */
45 long lower_bound; /* "lb" value */
46 long upper_bound; /* "ub" value */
47 } asn_per_constraint_t;
48 typedef struct asn_per_constraints_s {
49 asn_per_constraint_t value;
50 asn_per_constraint_t size;
51 int (*value2code)(unsigned int value);
52 int (*code2value)(unsigned int code);
53 } asn_per_constraints_t;
55 /* Temporary compatibility layer. Will get removed. */
56 typedef struct asn_bit_data_s asn_per_data_t;
57 #define per_get_few_bits(data, bits) asn_get_few_bits(data, bits)
58 #define per_get_undo(data, bits) asn_get_undo(data, bits)
59 #define per_get_many_bits(data, dst, align, bits) \
60 asn_get_many_bits(data, dst, align, bits)
63 * X.691 (08/2015) #11.9 "General rules for encoding a length determinant"
64 * Get the length "n" from the Unaligned PER stream.
66 ssize_t uper_get_length(asn_per_data_t *pd, int effective_bound_bits,
67 size_t lower_bound, int *repeat);
69 ssize_t aper_get_length(asn_per_data_t *pd, int range,
70 int effective_bound_bits, int *repeat);
73 * Get the normally small length "n".
75 ssize_t uper_get_nslength(asn_per_data_t *pd);
76 ssize_t aper_get_nslength(asn_per_data_t *pd);
79 * Get the normally small non-negative whole number.
81 ssize_t uper_get_nsnnwn(asn_per_data_t *pd);
82 ssize_t aper_get_nsnnwn(asn_per_data_t *pd, int range);
84 /* X.691-2008/11, #11.5.6 */
85 int uper_get_constrained_whole_number(asn_per_data_t *pd, unsigned long *v, int nbits);
88 /* Temporary compatibility layer. Will get removed. */
89 typedef struct asn_bit_outp_s asn_per_outp_t;
90 #define per_put_few_bits(out, bits, obits) asn_put_few_bits(out, bits, obits)
91 #define per_put_many_bits(out, src, nbits) asn_put_many_bits(out, src, nbits)
92 #define per_put_aligned_flush(out) asn_put_aligned_flush(out)
96 * Rebase the given value as an offset into the range specified by the
97 * lower bound (lb) and upper bound (ub).
99 * -1: Conversion failed due to range problems.
100 * 0: Conversion was successful.
102 int per_long_range_rebase(long v, long lb, long ub, unsigned long *output);
103 /* The inverse operation: restores the value by the offset and its bounds. */
104 int per_long_range_unrebase(unsigned long inp, long lb, long ub, long *outp);
106 /* X.691-2008/11, #11.5 */
107 int uper_put_constrained_whole_number_u(asn_per_outp_t *po, unsigned long v, int nbits);
110 * X.691 (08/2015) #11.9 "General rules for encoding a length determinant"
111 * Put the length "whole_length" to the Unaligned PER stream.
112 * If (opt_need_eom) is given, it will be set to 1 if final 0-length is needed.
113 * In that case, invoke uper_put_length(po, 0, 0) after encoding the last block.
114 * This function returns the number of units which may be flushed
115 * in the next units saving iteration.
117 ssize_t uper_put_length(asn_per_outp_t *po, size_t whole_length,
120 ssize_t aper_put_length(asn_per_outp_t *po, int range, size_t length);
122 /* Align the current bit position to octet bundary */
123 int aper_put_align(asn_per_outp_t *po);
124 int32_t aper_get_align(asn_per_data_t *pd);
127 * Put the normally small length "n" to the Unaligned PER stream.
130 int uper_put_nslength(asn_per_outp_t *po, size_t length);
132 int aper_put_nslength(asn_per_outp_t *po, size_t length);
135 * Put the normally small non-negative whole number.
137 int uper_put_nsnnwn(asn_per_outp_t *po, int n);
139 int aper_put_nsnnwn(asn_per_outp_t *po, int range, int number);
145 #endif /* _PER_SUPPORT_H_ */