| /*- |
| * Copyright (c) 2003 Lev Walkin <vlm@lionet.info>. All rights reserved. |
| * Redistribution and modifications are permitted subject to BSD license. |
| */ |
| #include <NULL.h> |
| #include <BOOLEAN.h> /* Implemented in terms of BOOLEAN type */ |
| |
| /* |
| * NULL basic type description. |
| */ |
| static ber_tlv_tag_t asn1_DEF_NULL_tags[] = { |
| (ASN_TAG_CLASS_UNIVERSAL | (5 << 2)) |
| }; |
| asn1_TYPE_descriptor_t asn1_DEF_NULL = { |
| "NULL", |
| asn_generic_no_constraint, |
| BOOLEAN_decode_ber, /* Implemented in terms of BOOLEAN */ |
| NULL_encode_der, /* Special handling of DER encoding */ |
| NULL_print, |
| BOOLEAN_free, |
| 0, /* Use generic outmost tag fetcher */ |
| asn1_DEF_NULL_tags, |
| sizeof(asn1_DEF_NULL_tags)/sizeof(asn1_DEF_NULL_tags[0]), |
| 1, /* Single UNIVERSAL tag may be implicitly overriden */ |
| 0, /* Always in primitive form */ |
| 0, 0, /* No members */ |
| 0 /* No specifics */ |
| }; |
| |
| der_enc_rval_t |
| NULL_encode_der(asn1_TYPE_descriptor_t *sd, void *ptr, |
| int tag_mode, ber_tlv_tag_t tag, |
| asn_app_consume_bytes_f *cb, void *app_key) { |
| der_enc_rval_t erval; |
| |
| erval.encoded = der_write_tags(sd, 0, tag_mode, tag, cb, app_key); |
| if(erval.encoded == -1) { |
| erval.failed_type = sd; |
| erval.structure_ptr = ptr; |
| } |
| |
| return erval; |
| } |
| |
| int |
| NULL_print(asn1_TYPE_descriptor_t *td, const void *sptr, int ilevel, |
| asn_app_consume_bytes_f *cb, void *app_key) { |
| |
| (void)td; /* Unused argument */ |
| (void)ilevel; /* Unused argument */ |
| |
| if(sptr) { |
| return cb("<present>", 9, app_key); |
| } else { |
| return cb("<absent>", 8, app_key); |
| } |
| } |