2 * Copyright (c) 2003-2017 Lev Walkin <vlm@lionet.info>. All rights reserved.
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3 * Redistribution and modifications are permitted subject to BSD license.
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6 * This file contains the declaration structure called "ASN.1 Type Definition",
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7 * which holds all information necessary for encoding and decoding routines.
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8 * This structure even contains pointer to these encoding and decoding routines
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9 * for each defined ASN.1 type.
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11 #ifndef _CONSTR_TYPE_H_
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12 #define _CONSTR_TYPE_H_
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14 #include <ber_tlv_length.h>
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15 #include <ber_tlv_tag.h>
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21 struct asn_TYPE_descriptor_s; /* Forward declaration */
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22 struct asn_TYPE_member_s; /* Forward declaration */
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25 * This type provides the context information for various ASN.1 routines,
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26 * primarily ones doing decoding. A member _asn_ctx of this type must be
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27 * included into certain target language's structures, such as compound types.
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29 typedef struct asn_struct_ctx_s {
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30 short phase; /* Decoding phase */
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31 short step; /* Elementary step of a phase */
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32 int context; /* Other context information */
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33 void *ptr; /* Decoder-specific stuff (stack elements) */
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34 ber_tlv_len_t left; /* Number of bytes left, -1 for indefinite */
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37 #include <ber_decoder.h> /* Basic Encoding Rules decoder */
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38 #include <der_encoder.h> /* Distinguished Encoding Rules encoder */
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39 #include <xer_decoder.h> /* Decoder of XER (XML, text) */
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40 #include <xer_encoder.h> /* Encoder into XER (XML, text) */
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41 #include <per_decoder.h> /* Packet Encoding Rules decoder */
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42 #include <per_encoder.h> /* Packet Encoding Rules encoder */
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43 #include <constraints.h> /* Subtype constraints support */
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44 #include <asn_random_fill.h> /* Random structures support */
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46 #ifdef ASN_DISABLE_OER_SUPPORT
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47 typedef void (oer_type_decoder_f)(void);
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48 typedef void (oer_type_encoder_f)(void);
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49 typedef void asn_oer_constraints_t;
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51 #include <oer_decoder.h> /* Octet Encoding Rules encoder */
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52 #include <oer_encoder.h> /* Octet Encoding Rules encoder */
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56 * Free the structure according to its specification.
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57 * Use one of ASN_STRUCT_{FREE,RESET,CONTENTS_ONLY} macros instead.
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58 * Do not use directly.
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60 enum asn_struct_free_method {
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61 ASFM_FREE_EVERYTHING, /* free(struct_ptr) and underlying members */
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62 ASFM_FREE_UNDERLYING, /* free underlying members */
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63 ASFM_FREE_UNDERLYING_AND_RESET /* FREE_UNDERLYING + memset(0) */
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65 typedef void (asn_struct_free_f)(
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66 const struct asn_TYPE_descriptor_s *type_descriptor,
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67 void *struct_ptr, enum asn_struct_free_method);
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70 * Free the structure including freeing the memory pointed to by ptr itself.
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72 #define ASN_STRUCT_FREE(asn_DEF, ptr) \
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73 (asn_DEF).op->free_struct(&(asn_DEF), (ptr), ASFM_FREE_EVERYTHING)
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76 * Free the memory used by the members of the structure without freeing the
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77 * the structure pointer itself.
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78 * ZERO-OUT the structure to the safe clean state.
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79 * (Retaining the pointer may be useful in case the structure is allocated
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80 * statically or arranged on the stack, yet its elements are dynamic.)
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82 #define ASN_STRUCT_RESET(asn_DEF, ptr) \
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83 (asn_DEF).op->free_struct(&(asn_DEF), (ptr), ASFM_FREE_UNDERLYING_AND_RESET)
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86 * Free memory used by the members of the structure without freeing
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87 * the structure pointer itself.
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88 * (Retaining the pointer may be useful in case the structure is allocated
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89 * statically or arranged on the stack, yet its elements are dynamic.)
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90 * AVOID using it in the application code;
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91 * Use a safer ASN_STRUCT_RESET() instead.
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93 #define ASN_STRUCT_FREE_CONTENTS_ONLY(asn_DEF, ptr) \
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94 (asn_DEF).op->free_struct(&(asn_DEF), (ptr), ASFM_FREE_UNDERLYING)
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97 * Print the structure according to its specification.
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99 typedef int(asn_struct_print_f)(
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100 const struct asn_TYPE_descriptor_s *type_descriptor,
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101 const void *struct_ptr,
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102 int level, /* Indentation level */
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103 asn_app_consume_bytes_f *callback, void *app_key);
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106 * Compare two structs between each other.
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107 * Returns <0 if struct_A is "smaller" than struct_B, >0 if "greater",
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108 * and =0 if "equal to", for some type-specific, stable definition of
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109 * "smaller", "greater" and "equal to".
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111 typedef int (asn_struct_compare_f)(
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112 const struct asn_TYPE_descriptor_s *type_descriptor,
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113 const void *struct_A,
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114 const void *struct_B);
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117 * Return the outmost tag of the type.
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118 * If the type is untagged CHOICE, the dynamic operation is performed.
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119 * NOTE: This function pointer type is only useful internally.
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120 * Do not use it in your application.
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122 typedef ber_tlv_tag_t (asn_outmost_tag_f)(
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123 const struct asn_TYPE_descriptor_s *type_descriptor,
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124 const void *struct_ptr, int tag_mode, ber_tlv_tag_t tag);
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125 /* The instance of the above function type; used internally. */
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126 asn_outmost_tag_f asn_TYPE_outmost_tag;
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129 * Fetch the desired type of the Open Type based on the
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130 * Information Object Set driven constraints.
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132 typedef struct asn_type_selector_result_s {
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133 const struct asn_TYPE_descriptor_s *type_descriptor; /* Type encoded. */
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134 unsigned presence_index; /* Associated choice variant. */
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135 } asn_type_selector_result_t;
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136 typedef asn_type_selector_result_t(asn_type_selector_f)(
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137 const struct asn_TYPE_descriptor_s *parent_type_descriptor,
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138 const void *parent_structure_ptr);
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141 * Generalized functions for dealing with the speciic type.
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142 * May be directly invoked by applications.
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144 typedef struct asn_TYPE_operation_s {
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145 asn_struct_free_f *free_struct; /* Free the structure */
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146 asn_struct_print_f *print_struct; /* Human readable output */
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147 asn_struct_compare_f *compare_struct; /* Compare two structures */
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148 ber_type_decoder_f *ber_decoder; /* Generic BER decoder */
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149 der_type_encoder_f *der_encoder; /* Canonical DER encoder */
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150 xer_type_decoder_f *xer_decoder; /* Generic XER decoder */
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151 xer_type_encoder_f *xer_encoder; /* [Canonical] XER encoder */
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152 oer_type_decoder_f *oer_decoder; /* Generic OER decoder */
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153 oer_type_encoder_f *oer_encoder; /* Canonical OER encoder */
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154 per_type_decoder_f *uper_decoder; /* Unaligned PER decoder */
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155 per_type_encoder_f *uper_encoder; /* Unaligned PER encoder */
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156 per_type_decoder_f *aper_decoder; /* Aligned PER decoder */
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157 per_type_encoder_f *aper_encoder; /* Aligned PER encoder */
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158 asn_random_fill_f *random_fill; /* Initialize with a random value */
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159 asn_outmost_tag_f *outmost_tag; /* <optional, internal> */
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160 } asn_TYPE_operation_t;
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163 * A constraints tuple specifying both the OER and PER constraints.
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165 typedef struct asn_encoding_constraints_s {
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166 const struct asn_oer_constraints_s *oer_constraints;
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167 const struct asn_per_constraints_s *per_constraints;
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168 asn_constr_check_f *general_constraints;
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169 } asn_encoding_constraints_t;
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172 * The definitive description of the destination language's structure.
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174 typedef struct asn_TYPE_descriptor_s {
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175 const char *name; /* A name of the ASN.1 type. "" in some cases. */
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176 const char *xml_tag; /* Name used in XML tag */
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179 * Generalized functions for dealing with the specific type.
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180 * May be directly invoked by applications.
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182 asn_TYPE_operation_t *op;
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184 /***********************************************************************
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185 * Internally useful members. Not to be used by applications directly. *
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186 **********************************************************************/
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189 * Tags that are expected to occur.
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191 const ber_tlv_tag_t *tags; /* Effective tags sequence for this type */
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192 unsigned tags_count; /* Number of tags which are expected */
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193 const ber_tlv_tag_t *all_tags; /* Every tag for BER/containment */
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194 unsigned all_tags_count; /* Number of tags */
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196 /* OER, PER, and general constraints */
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197 asn_encoding_constraints_t encoding_constraints;
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200 * An ASN.1 production type members (members of SEQUENCE, SET, CHOICE).
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202 struct asn_TYPE_member_s *elements;
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203 unsigned elements_count;
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206 * Additional information describing the type, used by appropriate
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209 const void *specifics;
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210 } asn_TYPE_descriptor_t;
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213 * This type describes an element of the constructed type,
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214 * i.e. SEQUENCE, SET, CHOICE, etc.
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216 enum asn_TYPE_flags_e {
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218 ATF_POINTER = 0x01, /* Represented by the pointer */
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219 ATF_OPEN_TYPE = 0x02, /* Open Type */
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220 ATF_ANY_TYPE = 0x04 /* ANY type (deprecated!) */
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222 typedef struct asn_TYPE_member_s {
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223 enum asn_TYPE_flags_e flags; /* Element's presentation flags */
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224 unsigned optional; /* Following optional members, including current */
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225 unsigned memb_offset; /* Offset of the element */
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226 ber_tlv_tag_t tag; /* Outmost (most immediate) tag */
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227 int tag_mode; /* IMPLICIT/no/EXPLICIT tag at current level */
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228 asn_TYPE_descriptor_t *type; /* Member type descriptor */
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229 asn_type_selector_f *type_selector; /* IoS runtime type selector */
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230 asn_encoding_constraints_t encoding_constraints;
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231 int (*default_value_cmp)(const void *sptr); /* Compare DEFAULT <value> */
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232 int (*default_value_set)(void **sptr); /* Set DEFAULT <value> */
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233 const char *name; /* ASN.1 identifier of the element */
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234 } asn_TYPE_member_t;
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237 * BER tag to element number mapping.
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239 typedef struct asn_TYPE_tag2member_s {
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240 ber_tlv_tag_t el_tag; /* Outmost tag of the member */
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241 unsigned el_no; /* Index of the associated member, base 0 */
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242 int toff_first; /* First occurence of the el_tag, relative */
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243 int toff_last; /* Last occurence of the el_tag, relative */
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244 } asn_TYPE_tag2member_t;
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247 * This function prints out the contents of the target language's structure
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248 * (struct_ptr) into the file pointer (stream) in human readable form.
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250 * 0: The structure is printed.
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251 * -1: Problem dumping the structure.
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252 * (See also xer_fprint() in xer_encoder.h)
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254 int asn_fprint(FILE *stream, /* Destination stream descriptor */
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255 const asn_TYPE_descriptor_t *td, /* ASN.1 type descriptor */
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256 const void *struct_ptr); /* Structure to be printed */
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262 #endif /* _CONSTR_TYPE_H_ */
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