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136 lines
4.2 KiB
C
136 lines
4.2 KiB
C
/*
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* Copyright (c) 2005-2014 Lev Walkin <vlm@lionet.info>.
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* 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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#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 const 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 const struct asn_per_constraints_s {
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struct asn_per_constraint_s value;
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struct asn_per_constraint_s 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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/*
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* This structure describes a position inside an incoming PER bit stream.
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*/
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typedef struct asn_per_data_s {
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const uint8_t *buffer; /* Pointer to the octet stream */
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size_t nboff; /* Bit offset to the meaningful bit */
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size_t nbits; /* Number of bits in the stream */
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size_t moved; /* Number of bits moved through this bit stream */
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int (*refill)(struct asn_per_data_s *);
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void *refill_key;
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} asn_per_data_t;
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/*
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* Extract a small number of bits (<= 31) from the specified PER data pointer.
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* This function returns -1 if the specified number of bits could not be
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* extracted due to EOD or other conditions.
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*/
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int32_t per_get_few_bits(asn_per_data_t *per_data, int get_nbits);
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/* Undo the immediately preceeding "get_few_bits" operation */
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void per_get_undo(asn_per_data_t *per_data, int get_nbits);
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/*
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* Extract a large number of bits from the specified PER data pointer.
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* This function returns -1 if the specified number of bits could not be
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* extracted due to EOD or other conditions.
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*/
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int per_get_many_bits(asn_per_data_t *pd, uint8_t *dst, int right_align,
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int get_nbits);
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/*
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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,
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int effective_bound_bits,
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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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/*
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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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/* 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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/* Non-thread-safe debugging function, don't use it */
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char *per_data_string(asn_per_data_t *pd);
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/*
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* This structure supports forming PER output.
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*/
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typedef struct asn_per_outp_s {
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uint8_t *buffer; /* Pointer into the (tmpspace) */
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size_t nboff; /* Bit offset to the meaningful bit */
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size_t nbits; /* Number of bits left in (tmpspace) */
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uint8_t tmpspace[32]; /* Preliminary storage to hold data */
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int (*outper)(const void *data, size_t size, void *op_key);
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void *op_key; /* Key for (outper) data callback */
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size_t flushed_bytes; /* Bytes already flushed through (outper) */
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} asn_per_outp_t;
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/* Output a small number of bits (<= 31) */
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int per_put_few_bits(asn_per_outp_t *per_data, uint32_t bits, int obits);
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/* Output a large number of bits */
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int per_put_many_bits(asn_per_outp_t *po, const uint8_t *src, int put_nbits);
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/* X.691-2008/11, #11.5 */
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int uper_put_constrained_whole_number_s(asn_per_outp_t *po, long v, int nbits);
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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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* Put the length "n" to the Unaligned PER stream.
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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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/*
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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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/*
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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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#ifdef __cplusplus
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}
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#endif
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#endif /* _PER_SUPPORT_H_ */
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