mirror of https://gerrit.osmocom.org/asn1c
309 lines
7.2 KiB
C
309 lines
7.2 KiB
C
/*-
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* Copyright (c) 2003, 2005 Lev Walkin <vlm@lionet.info>. All rights reserved.
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* Redistribution and modifications are permitted subject to BSD license.
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*/
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#include <asn_internal.h>
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#include <asn_codecs_prim.h>
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#include <NULL.h>
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/*
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* NULL basic type description.
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*/
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static const ber_tlv_tag_t asn_DEF_NULL_tags[] = {
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(ASN_TAG_CLASS_UNIVERSAL | (5 << 2))
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};
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asn_TYPE_operation_t asn_OP_NULL = {
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NULL_free,
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NULL_print,
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NULL_compare,
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NULL_decode_ber,
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NULL_encode_der, /* Special handling of DER encoding */
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NULL_decode_xer,
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NULL_encode_xer,
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#ifdef ASN_DISABLE_OER_SUPPORT
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0,
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0,
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#else
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NULL_decode_oer,
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NULL_encode_oer,
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#endif /* ASN_DISABLE_OER_SUPPORT */
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#ifdef ASN_DISABLE_PER_SUPPORT
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0,
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0,
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#else
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NULL_decode_uper, /* Unaligned PER decoder */
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NULL_encode_uper, /* Unaligned PER encoder */
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#endif /* ASN_DISABLE_PER_SUPPORT */
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NULL_random_fill,
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0 /* Use generic outmost tag fetcher */
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};
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asn_TYPE_descriptor_t asn_DEF_NULL = {
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"NULL",
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"NULL",
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&asn_OP_NULL,
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asn_DEF_NULL_tags,
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sizeof(asn_DEF_NULL_tags) / sizeof(asn_DEF_NULL_tags[0]),
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asn_DEF_NULL_tags, /* Same as above */
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sizeof(asn_DEF_NULL_tags) / sizeof(asn_DEF_NULL_tags[0]),
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{ 0, 0, asn_generic_no_constraint },
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0, 0, /* No members */
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0 /* No specifics */
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};
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void
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NULL_free(const asn_TYPE_descriptor_t *td, void *ptr,
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enum asn_struct_free_method method) {
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if(td && ptr) {
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switch(method) {
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case ASFM_FREE_EVERYTHING:
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FREEMEM(ptr);
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break;
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case ASFM_FREE_UNDERLYING:
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break;
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case ASFM_FREE_UNDERLYING_AND_RESET:
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memset(ptr, 0, sizeof(NULL_t));
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break;
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}
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}
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}
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/*
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* Decode NULL type.
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*/
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asn_dec_rval_t
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NULL_decode_ber(const asn_codec_ctx_t *opt_codec_ctx,
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const asn_TYPE_descriptor_t *td, void **bool_value,
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const void *buf_ptr, size_t size, int tag_mode) {
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NULL_t *st = (NULL_t *)*bool_value;
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asn_dec_rval_t rval;
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ber_tlv_len_t length;
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if(st == NULL) {
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st = (NULL_t *)(*bool_value = CALLOC(1, sizeof(*st)));
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if(st == NULL) {
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rval.code = RC_FAIL;
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rval.consumed = 0;
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return rval;
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}
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}
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ASN_DEBUG("Decoding %s as NULL (tm=%d)", td->name, tag_mode);
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/*
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* Check tags.
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*/
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rval = ber_check_tags(opt_codec_ctx, td, 0, buf_ptr, size, tag_mode, 0,
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&length, 0);
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if(rval.code != RC_OK) {
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return rval;
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}
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// X.690-201508, #8.8.2, length shall be zero.
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if(length != 0) {
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ASN_DEBUG("Decoding %s as NULL failed: too much data", td->name);
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rval.code = RC_FAIL;
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rval.consumed = 0;
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return rval;
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}
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return rval;
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}
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asn_enc_rval_t
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NULL_encode_der(const asn_TYPE_descriptor_t *td, const void *ptr, int tag_mode,
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ber_tlv_tag_t tag, asn_app_consume_bytes_f *cb, void *app_key) {
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asn_enc_rval_t erval;
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erval.encoded = der_write_tags(td, 0, tag_mode, 0, tag, cb, app_key);
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if(erval.encoded == -1) {
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erval.failed_type = td;
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erval.structure_ptr = ptr;
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}
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ASN__ENCODED_OK(erval);
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}
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asn_enc_rval_t
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NULL_encode_xer(const asn_TYPE_descriptor_t *td, const void *sptr, int ilevel,
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enum xer_encoder_flags_e flags, asn_app_consume_bytes_f *cb,
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void *app_key) {
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asn_enc_rval_t er;
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(void)td;
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(void)sptr;
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(void)ilevel;
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(void)flags;
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(void)cb;
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(void)app_key;
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/* XMLNullValue is empty */
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er.encoded = 0;
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ASN__ENCODED_OK(er);
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}
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static enum xer_pbd_rval
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NULL__xer_body_decode(const asn_TYPE_descriptor_t *td, void *sptr,
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const void *chunk_buf, size_t chunk_size) {
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(void)td;
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(void)sptr;
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(void)chunk_buf; /* Going to be empty according to the rules below. */
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/*
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* There must be no content in self-terminating <NULL/> tag.
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*/
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if(chunk_size)
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return XPBD_BROKEN_ENCODING;
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else
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return XPBD_BODY_CONSUMED;
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}
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asn_dec_rval_t
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NULL_decode_xer(const asn_codec_ctx_t *opt_codec_ctx,
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const asn_TYPE_descriptor_t *td, void **sptr,
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const char *opt_mname, const void *buf_ptr, size_t size) {
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return xer_decode_primitive(opt_codec_ctx, td,
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sptr, sizeof(NULL_t), opt_mname, buf_ptr, size,
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NULL__xer_body_decode);
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}
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int
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NULL_compare(const asn_TYPE_descriptor_t *td, const void *a, const void *b) {
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(void)td;
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(void)a;
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(void)b;
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return 0;
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}
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int
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NULL_print(const asn_TYPE_descriptor_t *td, const void *sptr, int ilevel,
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asn_app_consume_bytes_f *cb, void *app_key) {
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(void)td; /* Unused argument */
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(void)ilevel; /* Unused argument */
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if(sptr) {
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return (cb("<present>", 9, app_key) < 0) ? -1 : 0;
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} else {
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return (cb("<absent>", 8, app_key) < 0) ? -1 : 0;
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}
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}
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#ifndef ASN_DISABLE_OER_SUPPORT
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asn_dec_rval_t
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NULL_decode_oer(const asn_codec_ctx_t *opt_codec_ctx,
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const asn_TYPE_descriptor_t *td,
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const asn_oer_constraints_t *constraints, void **sptr,
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const void *ptr, size_t size) {
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asn_dec_rval_t rv = {RC_OK, 0};
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(void)opt_codec_ctx;
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(void)td;
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(void)constraints;
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(void)ptr;
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(void)size;
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if(!*sptr) {
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*sptr = MALLOC(sizeof(NULL_t));
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if(*sptr) {
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*(NULL_t *)*sptr = 0;
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} else {
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ASN__DECODE_FAILED;
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}
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}
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return rv;
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}
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asn_enc_rval_t
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NULL_encode_oer(const asn_TYPE_descriptor_t *td,
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const asn_oer_constraints_t *constraints, const void *sptr,
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asn_app_consume_bytes_f *cb, void *app_key) {
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asn_enc_rval_t er;
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(void)td;
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(void)sptr;
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(void)constraints;
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(void)cb;
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(void)app_key;
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er.encoded = 0; /* Encoding in 0 bytes. */
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ASN__ENCODED_OK(er);
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}
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#endif /* ASN_DISABLE_OER_SUPPORT */
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#ifndef ASN_DISABLE_PER_SUPPORT
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asn_dec_rval_t
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NULL_decode_uper(const asn_codec_ctx_t *opt_codec_ctx,
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const asn_TYPE_descriptor_t *td,
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const asn_per_constraints_t *constraints, void **sptr,
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asn_per_data_t *pd) {
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asn_dec_rval_t rv;
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(void)opt_codec_ctx;
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(void)td;
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(void)constraints;
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(void)pd;
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if(!*sptr) {
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*sptr = MALLOC(sizeof(NULL_t));
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if(*sptr) {
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*(NULL_t *)*sptr = 0;
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} else {
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ASN__DECODE_FAILED;
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}
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}
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/*
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* NULL type does not have content octets.
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*/
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rv.code = RC_OK;
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rv.consumed = 0;
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return rv;
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}
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asn_enc_rval_t
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NULL_encode_uper(const asn_TYPE_descriptor_t *td,
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const asn_per_constraints_t *constraints, const void *sptr,
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asn_per_outp_t *po) {
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asn_enc_rval_t er;
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(void)td;
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(void)constraints;
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(void)sptr;
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(void)po;
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er.encoded = 0;
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ASN__ENCODED_OK(er);
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}
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#endif /* ASN_DISABLE_PER_SUPPORT */
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asn_random_fill_result_t
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NULL_random_fill(const asn_TYPE_descriptor_t *td, void **sptr,
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const asn_encoding_constraints_t *constr,
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size_t max_length) {
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asn_random_fill_result_t result_ok = {ARFILL_OK, 1};
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asn_random_fill_result_t result_failed = {ARFILL_FAILED, 0};
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asn_random_fill_result_t result_skipped = {ARFILL_SKIPPED, 0};
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NULL_t *st = *sptr;
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(void)td;
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(void)constr;
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if(max_length == 0) return result_skipped;
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if(st == NULL) {
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st = (NULL_t *)(*sptr = CALLOC(1, sizeof(*st)));
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if(st == NULL) {
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return result_failed;
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}
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}
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return result_ok;
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}
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