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/*
* Copyright (c) 2005 Lev Walkin <vlm@lionet.info>. All rights reserved.
* Redistribution and modifications are permitted subject to BSD license.
*/
#ifndef _PER_SUPPORT_H_
#define _PER_SUPPORT_H_
#include <asn_system.h> /* Platform-specific types */
#ifdef __cplusplus
extern "C" {
#endif
/*
* This structure describes a position inside a PER bit stream.
*/
typedef struct asn_per_data_s {
uint8_t *buffer; /* Pointer to the octet stream */
size_t nboff; /* Bit offset to the meaningful bit */
size_t nbits; /* Number of bits in the stream */
} asn_per_data_t;
/*
* Extract a small number of bits (<= 24) from the specified PER data pointer.
* This function returns -1 if the specified number of bits could not be
* extracted due to EOD or other conditions.
*/
int32_t per_get_few_bits(asn_per_data_t *per_data, int get_nbits);
/*
* Extract a large number of bits from the specified PER data pointer.
* This function returns -1 if the specified number of bits could not be
* extracted due to EOD or other conditions.
*/
int per_get_many_bits(asn_per_data_t *pd, uint8_t *dst, int right_align,
int get_nbits);
/*
* Get the length "n" from the Unaligned PER stream.
*/
ssize_t uper_get_length(asn_per_data_t *pd,
int effective_bound_bits,
int *repeat);
/*
* Get the normally small non-negative whole number.
*/
ssize_t uper_get_nsnnwn(asn_per_data_t *pd);
#ifdef __cplusplus
}
#endif
#endif /* _PER_SUPPORT_H_ */
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