2 * Copyright (c) 2003, 2004, 2005, 2006 Lev Walkin <vlm@lionet.info>.
4 * Redistribution and modifications are permitted subject to BSD license.
7 * This file contains the declaration structure called "ASN.1 Type Definition",
8 * which holds all information necessary for encoding and decoding routines.
9 * This structure even contains pointer to these encoding and decoding routines
10 * for each defined ASN.1 type.
12 #ifndef _CONSTR_TYPE_H_
13 #define _CONSTR_TYPE_H_
15 #include <ber_tlv_length.h>
16 #include <ber_tlv_tag.h>
22 struct asn_TYPE_descriptor_s; /* Forward declaration */
23 struct asn_TYPE_member_s; /* Forward declaration */
26 * This type provides the context information for various ASN.1 routines,
27 * primarily ones doing decoding. A member _asn_ctx of this type must be
28 * included into certain target language's structures, such as compound types.
30 typedef struct asn_struct_ctx_s {
31 short phase; /* Decoding phase */
32 short step; /* Elementary step of a phase */
33 int context; /* Other context information */
34 void *ptr; /* Decoder-specific stuff (stack elements) */
35 ber_tlv_len_t left; /* Number of bytes left, -1 for indefinite */
38 #include <ber_decoder.h> /* Basic Encoding Rules decoder */
39 #include <der_encoder.h> /* Distinguished Encoding Rules encoder */
40 #include <xer_decoder.h> /* Decoder of XER (XML, text) */
41 #include <xer_encoder.h> /* Encoder into XER (XML, text) */
42 #include <per_decoder.h> /* Packet Encoding Rules decoder */
43 #include <per_encoder.h> /* Packet Encoding Rules encoder */
44 #include <constraints.h> /* Subtype constraints support */
47 * Free the structure according to its specification.
48 * If (free_contents_only) is set, the wrapper structure itself (struct_ptr)
49 * will not be freed. (It may be useful in case the structure is allocated
50 * statically or arranged on the stack, yet its elements are allocated
53 typedef void (asn_struct_free_f)(
54 struct asn_TYPE_descriptor_s *type_descriptor,
55 void *struct_ptr, int free_contents_only);
56 #define ASN_STRUCT_FREE(asn_DEF, ptr) (asn_DEF).free_struct(&(asn_DEF),ptr,0)
57 #define ASN_STRUCT_FREE_CONTENTS_ONLY(asn_DEF, ptr) \
58 (asn_DEF).free_struct(&(asn_DEF),ptr,1)
61 * Print the structure according to its specification.
63 typedef int (asn_struct_print_f)(
64 struct asn_TYPE_descriptor_s *type_descriptor,
65 const void *struct_ptr,
66 int level, /* Indentation level */
67 asn_app_consume_bytes_f *callback, void *app_key);
70 * Return the outmost tag of the type.
71 * If the type is untagged CHOICE, the dynamic operation is performed.
72 * NOTE: This function pointer type is only useful internally.
73 * Do not use it in your application.
75 typedef ber_tlv_tag_t (asn_outmost_tag_f)(
76 const struct asn_TYPE_descriptor_s *type_descriptor,
77 const void *struct_ptr, int tag_mode, ber_tlv_tag_t tag);
78 /* The instance of the above function type; used internally. */
79 asn_outmost_tag_f asn_TYPE_outmost_tag;
83 * The definitive description of the destination language's structure.
85 typedef struct asn_TYPE_descriptor_s {
86 const char *name; /* A name of the ASN.1 type. "" in some cases. */
87 const char *xml_tag; /* Name used in XML tag */
90 * Generalized functions for dealing with the specific type.
91 * May be directly invoked by applications.
93 asn_struct_free_f *free_struct; /* Free the structure */
94 asn_struct_print_f *print_struct; /* Human readable output */
95 asn_constr_check_f *check_constraints; /* Constraints validator */
96 ber_type_decoder_f *ber_decoder; /* Generic BER decoder */
97 der_type_encoder_f *der_encoder; /* Canonical DER encoder */
98 xer_type_decoder_f *xer_decoder; /* Generic XER decoder */
99 xer_type_encoder_f *xer_encoder; /* [Canonical] XER encoder */
100 per_type_decoder_f *uper_decoder; /* Unaligned PER decoder */
101 per_type_encoder_f *uper_encoder; /* Unaligned PER encoder */
103 /***********************************************************************
104 * Internally useful members. Not to be used by applications directly. *
105 **********************************************************************/
108 * Tags that are expected to occur.
110 asn_outmost_tag_f *outmost_tag; /* <optional, internal> */
111 const ber_tlv_tag_t *tags; /* Effective tags sequence for this type */
112 int tags_count; /* Number of tags which are expected */
113 const ber_tlv_tag_t *all_tags; /* Every tag for BER/containment */
114 int all_tags_count; /* Number of tags */
116 asn_per_constraints_t *per_constraints; /* PER compiled constraints */
119 * An ASN.1 production type members (members of SEQUENCE, SET, CHOICE).
121 struct asn_TYPE_member_s *elements;
125 * Additional information describing the type, used by appropriate
128 const void *specifics;
129 } asn_TYPE_descriptor_t;
132 * This type describes an element of the constructed type,
133 * i.e. SEQUENCE, SET, CHOICE, etc.
135 enum asn_TYPE_flags_e {
137 ATF_POINTER = 0x01, /* Represented by the pointer */
138 ATF_OPEN_TYPE = 0x02 /* ANY type, without meaningful tag */
140 typedef struct asn_TYPE_member_s {
141 enum asn_TYPE_flags_e flags; /* Element's presentation flags */
142 int optional; /* Following optional members, including current */
143 int memb_offset; /* Offset of the element */
144 ber_tlv_tag_t tag; /* Outmost (most immediate) tag */
145 int tag_mode; /* IMPLICIT/no/EXPLICIT tag at current level */
146 asn_TYPE_descriptor_t *type; /* Member type descriptor */
147 asn_constr_check_f *memb_constraints; /* Constraints validator */
148 asn_per_constraints_t *per_constraints; /* PER compiled constraints */
149 int (*default_value)(int setval, void **sptr); /* DEFAULT <value> */
150 const char *name; /* ASN.1 identifier of the element */
154 * BER tag to element number mapping.
156 typedef struct asn_TYPE_tag2member_s {
157 ber_tlv_tag_t el_tag; /* Outmost tag of the member */
158 int el_no; /* Index of the associated member, base 0 */
159 int toff_first; /* First occurence of the el_tag, relative */
160 int toff_last; /* Last occurence of the el_tag, relatvie */
161 } asn_TYPE_tag2member_t;
164 * This function is a wrapper around (td)->print_struct, which prints out
165 * the contents of the target language's structure (struct_ptr) into the
166 * file pointer (stream) in human readable form.
168 * 0: The structure is printed.
169 * -1: Problem dumping the structure.
170 * (See also xer_fprint() in xer_encoder.h)
172 int asn_fprint(FILE *stream, /* Destination stream descriptor */
173 asn_TYPE_descriptor_t *td, /* ASN.1 type descriptor */
174 const void *struct_ptr); /* Structure to be printed */
180 #endif /* _CONSTR_TYPE_H_ */