mirror of https://gerrit.osmocom.org/asn1c
55 lines
1.4 KiB
C
55 lines
1.4 KiB
C
/*
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* Copyright (c) 2005 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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#ifdef __cplusplus
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extern "C" {
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#endif
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/*
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* This structure describes a position inside a 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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} 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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/*
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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 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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#ifdef __cplusplus
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}
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#endif
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#endif /* _PER_SUPPORT_H_ */
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