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Diffstat (limited to 'src/asn1c/per_support.h')
| -rw-r--r-- | src/asn1c/per_support.h | 135 |
1 files changed, 135 insertions, 0 deletions
diff --git a/src/asn1c/per_support.h b/src/asn1c/per_support.h new file mode 100644 index 0000000..10c84ed --- /dev/null +++ b/src/asn1c/per_support.h @@ -0,0 +1,135 @@ +/* + * Copyright (c) 2005-2014 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; + int (*value2code)(unsigned int value); + int (*code2value)(unsigned int code); +} 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 */ + size_t moved; /* Number of bits moved through this bit stream */ + int (*refill)(struct asn_per_data_s *); + void *refill_key; +} 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); + +/* Undo the immediately preceeding "get_few_bits" operation */ +void per_get_undo(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 length "n". + */ +ssize_t uper_get_nslength(asn_per_data_t *pd); + +/* + * Get the normally small non-negative whole number. + */ +ssize_t uper_get_nsnnwn(asn_per_data_t *pd); + +/* X.691-2008/11, #11.5.6 */ +int uper_get_constrained_whole_number(asn_per_data_t *pd, unsigned long *v, int nbits); + +/* Non-thread-safe debugging function, don't use it */ +char *per_data_string(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); + +/* X.691-2008/11, #11.5 */ +int uper_put_constrained_whole_number_s(asn_per_outp_t *po, long v, int nbits); +int uper_put_constrained_whole_number_u(asn_per_outp_t *po, unsigned long v, int 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 length "n" to the Unaligned PER stream. + * Returns 0 or -1. + */ +int uper_put_nslength(asn_per_outp_t *po, size_t 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_ */ |