mirror of https://gerrit.osmocom.org/asn1c
CHOICE XER support, draft
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@ -539,6 +539,179 @@ CHOICE_constraint(asn_TYPE_descriptor_t *td, const void *sptr,
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}
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}
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#undef ADVANCE /* Just in case */
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#undef XER_ADVANCE
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#define XER_ADVANCE(num_bytes) do { \
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size_t num = num_bytes; \
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buf_ptr = ((char *)buf_ptr) + num; \
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size -= num; \
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consumed_myself += num; \
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} while(0)
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asn_dec_rval_t
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CHOICE_decode_xer(asn_codec_ctx_t *opt_codec_ctx, asn_TYPE_descriptor_t *td,
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void **struct_ptr, const char *opt_mname,
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void *buf_ptr, size_t size) {
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/*
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* Bring closer parts of structure description.
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*/
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asn_CHOICE_specifics_t *specs = (asn_CHOICE_specifics_t *)td->specifics;
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const char *xml_tag = opt_mname ? opt_mname : td->xml_tag;
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/*
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* Parts of the structure being constructed.
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*/
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void *st = *struct_ptr; /* Target structure. */
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asn_struct_ctx_t *ctx; /* Decoder context */
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asn_dec_rval_t rval;
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ssize_t consumed_myself = 0; /* Consumed bytes from ptr */
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int xer_state; /* XER low level parsing context */
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int edx; /* Element index */
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/*
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* Create the target structure if it is not present already.
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*/
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if(st == 0) {
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st = *struct_ptr = CALLOC(1, specs->struct_size);
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if(st == 0) RETURN(RC_FAIL);
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}
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/*
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* Restore parsing context.
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*/
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ctx = (asn_struct_ctx_t *)((char *)st + specs->ctx_offset);
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/*
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* Phases of XER/XML processing:
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* Phase 0: Check that the opening tag matches our expectations.
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* Phase 1: Processing body and reacting on closing tag.
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* Phase 2: Processing inner type.
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* Phase 3: Only waiting for closing tag
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*/
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if(ctx->phase > 3) RETURN(RC_FAIL);
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for(xer_state = ctx->left, edx = ctx->step;;) {
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pxer_chunk_type_e ch_type; /* XER chunk type */
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ssize_t ch_size; /* Chunk size */
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xer_check_tag_e tcv; /* Tag check value */
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asn_TYPE_member_t *elm;
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/*
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* Go inside the member.
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*/
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if(ctx->phase == 2) {
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asn_dec_rval_t tmprval;
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elm = &td->elements[edx];
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void *memb_ptr; /* Pointer to the member */
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void **memb_ptr2; /* Pointer to that pointer */
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if(elm->flags & ATF_POINTER) {
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/* Member is a pointer to another structure */
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memb_ptr2 = (void **)((char *)st
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+ elm->memb_offset);
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} else {
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memb_ptr = (char *)st + elm->memb_offset;
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memb_ptr2 = &memb_ptr;
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}
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tmprval = elm->type->xer_decoder(opt_codec_ctx,
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elm->type, memb_ptr2, elm->name,
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buf_ptr, size);
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XER_ADVANCE(tmprval.consumed);
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if(tmprval.code != RC_OK)
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RETURN(tmprval.code);
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ctx->left = xer_state = 0; /* New, clean state */
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ctx->phase = 3;
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/* Fall through */
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}
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/*
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* Get the next part of the XML stream.
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*/
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ch_size = xer_next_token(&xer_state, buf_ptr, size, &ch_type);
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switch(ch_size) {
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case -1: RETURN(RC_FAIL);
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case 0:
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ctx->left = xer_state;
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RETURN(RC_WMORE);
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default:
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switch(ch_type) {
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case PXER_COMMENT: /* Got XML comment */
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case PXER_TEXT: /* Ignore free-standing text */
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XER_ADVANCE(ch_size); /* Skip silently */
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continue;
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case PXER_TAG:
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break; /* Check the rest down there */
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}
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}
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tcv = xer_check_tag(buf_ptr, size, xml_tag);
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switch(tcv) {
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case XCT_BOTH:
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if(ctx->phase == 3)
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break;
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case XCT_CLOSING:
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if(ctx->phase == 0)
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break;
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XER_ADVANCE(ch_size);
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ctx->phase = 4;
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RETURN(RC_OK);
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case XCT_OPENING:
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if(ctx->phase == 0) {
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XER_ADVANCE(ch_size);
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ctx->phase = 1; /* Processing body phase */
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continue;
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} else if(ctx->phase == 3) {
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/* But we're waiting for closing! */
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break;
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}
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/* Fall through */
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case XCT_UNEXPECTED:
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if(ctx->phase != 1)
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break; /* Really unexpected */
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/*
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* Search which member corresponds to this tag.
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*/
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for(edx = 0; edx < td->elements_count; edx++) {
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elm = &td->elements[edx];
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tcv = xer_check_tag(buf_ptr, size, elm->name);
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switch(tcv) {
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case XCT_BOTH:
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case XCT_OPENING:
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/*
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* Process this member.
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*/
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ctx->step = edx;
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ctx->phase = 2;
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break;
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case XCT_UNEXPECTED:
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continue; /* or continue; */
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case XCT_CLOSING:
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default:
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edx = td->elements_count;
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break; /* Phase out */
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}
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break;
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}
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if(edx == td->elements_count) break;
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continue;
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default:
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break;
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}
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ASN_DEBUG("Unexpected XML tag in SEQUENCE");
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break;
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}
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ctx->phase = 4; /* Phase out, just in case */
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RETURN(RC_FAIL);
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}
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asn_enc_rval_t
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CHOICE_encode_xer(asn_TYPE_descriptor_t *td, void *sptr,
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int ilevel, enum xer_encoder_flags_e flags,
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@ -36,6 +36,7 @@ asn_struct_print_f CHOICE_print;
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asn_constr_check_f CHOICE_constraint;
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ber_type_decoder_f CHOICE_decode_ber;
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der_type_encoder_f CHOICE_encode_der;
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xer_type_decoder_f CHOICE_decode_xer;
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xer_type_encoder_f CHOICE_encode_xer;
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asn_outmost_tag_f CHOICE_outmost_tag;
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