libs/smux/include/stg/der_encoder.h

   1 /*-
   2  * Copyright (c) 2003-2017 Lev Walkin <vlm@lionet.info>. All rights reserved.
   3  * Redistribution and modifications are permitted subject to BSD license.
   4  */
   5 #ifndef _DER_ENCODER_H_
   6 #define _DER_ENCODER_H_
   7
   8 #include <asn_application.h>
   9
  10 #ifdef __cplusplus
  11 extern "C" {
  12 #endif
  13
  14 struct asn_TYPE_descriptor_s;   /* Forward declaration */
  15
  16 /*
  17  * The DER encoder of any type. May be invoked by the application.
  18  * Produces DER- and BER-compliant encoding. (DER is a subset of BER).
  19  *
  20  * NOTE: Use the ber_decode() function (ber_decoder.h) to decode data
  21  * produced by der_encode().
  22  */
  23 asn_enc_rval_t der_encode(const struct asn_TYPE_descriptor_s *type_descriptor,
  24                           const void *struct_ptr, /* Structure to be encoded */
  25                           asn_app_consume_bytes_f *consume_bytes_cb,
  26                           void *app_key /* Arbitrary callback argument */
  27 );
  28
  29 /* A variant of der_encode() which encodes data into the pre-allocated buffer */
  30 asn_enc_rval_t der_encode_to_buffer(
  31     const struct asn_TYPE_descriptor_s *type_descriptor,
  32     const void *struct_ptr, /* Structure to be encoded */
  33     void *buffer,           /* Pre-allocated buffer */
  34     size_t buffer_size      /* Initial buffer size (maximum) */
  35 );
  36
  37 /*
  38  * Type of the generic DER encoder.
  39  */
  40 typedef asn_enc_rval_t(der_type_encoder_f)(
  41     const struct asn_TYPE_descriptor_s *type_descriptor,
  42     const void *struct_ptr, /* Structure to be encoded */
  43     int tag_mode,           /* {-1,0,1}: IMPLICIT, no, EXPLICIT */
  44     ber_tlv_tag_t tag, asn_app_consume_bytes_f *consume_bytes_cb, /* Callback */
  45     void *app_key /* Arbitrary callback argument */
  46 );
  47
  48
  49 /*******************************
  50  * INTERNALLY USEFUL FUNCTIONS *
  51  *******************************/
  52
  53 /*
  54  * Write out leading TL[v] sequence according to the type definition.
  55  */
  56 ssize_t der_write_tags(const struct asn_TYPE_descriptor_s *type_descriptor,
  57                        size_t struct_length,
  58                        int tag_mode,      /* {-1,0,1}: IMPLICIT, no, EXPLICIT */
  59                        int last_tag_form, /* {0,!0}: prim, constructed */
  60                        ber_tlv_tag_t tag,
  61                        asn_app_consume_bytes_f *consume_bytes_cb,
  62                        void *app_key);
  63
  64 #ifdef __cplusplus
  65 }
  66 #endif
  67
  68 #endif  /* _DER_ENCODER_H_ */