| /* |
| * Copyright (c) 2005, 2006 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 |
| |
| /* |
| * Pre-computed PER constraints. |
| */ |
| typedef struct asn_per_constraint_s { |
| enum asn_per_constraint_flags { |
| APC_UNCONSTRAINED = 0x0, /* No PER visible constraints */ |
| APC_SEMI_CONSTRAINED = 0x1, /* Constrained at "lb" */ |
| APC_CONSTRAINED = 0x2, /* Fully constrained */ |
| APC_EXTENSIBLE = 0x4 /* May have extension */ |
| } flags; |
| int range_bits; /* Full number of bits in the range */ |
| int effective_bits; /* Effective bits */ |
| long lower_bound; /* "lb" value */ |
| long upper_bound; /* "ub" value */ |
| } asn_per_constraint_t; |
| typedef struct asn_per_constraints_s { |
| asn_per_constraint_t value; |
| asn_per_constraint_t size; |
| } asn_per_constraints_t; |
| |
| /* |
| * This structure describes a position inside an incoming PER bit stream. |
| */ |
| typedef struct asn_per_data_s { |
| const 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 (<= 31) 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); |
| |
| /* |
| * This structure supports forming PER output. |
| */ |
| typedef struct asn_per_outp_s { |
| uint8_t *buffer; /* Pointer into the (tmpspace) */ |
| size_t nboff; /* Bit offset to the meaningful bit */ |
| size_t nbits; /* Number of bits left in (tmpspace) */ |
| uint8_t tmpspace[32]; /* Preliminary storage to hold data */ |
| int (*outper)(const void *data, size_t size, void *op_key); |
| void *op_key; /* Key for (outper) data callback */ |
| size_t flushed_bytes; /* Bytes already flushed through (outper) */ |
| } asn_per_outp_t; |
| |
| /* Output a small number of bits (<= 31) */ |
| int per_put_few_bits(asn_per_outp_t *per_data, uint32_t bits, int obits); |
| |
| /* Output a large number of bits */ |
| int per_put_many_bits(asn_per_outp_t *po, const uint8_t *src, int put_nbits); |
| |
| /* |
| * Put the length "n" to the Unaligned PER stream. |
| * This function returns the number of units which may be flushed |
| * in the next units saving iteration. |
| */ |
| ssize_t uper_put_length(asn_per_outp_t *po, size_t whole_length); |
| |
| /* |
| * Put the normally small non-negative whole number. |
| */ |
| int uper_put_nsnnwn(asn_per_outp_t *po, int n); |
| |
| #ifdef __cplusplus |
| } |
| #endif |
| |
| #endif /* _PER_SUPPORT_H_ */ |