2 * Copyright (c) 2017 Lev Walkin <vlm@lionet.info>.
4 * Redistribution and modifications are permitted subject to BSD license.
6 #include <asn_internal.h>
7 #include <constr_SEQUENCE.h>
11 * Return a standardized complex structure.
14 #define RETURN(_code) \
17 rval.consumed = consumed_myself; \
22 * Check whether we are inside the extensions group.
24 #define IN_EXTENSION_GROUP(specs, memb_idx) \
25 ((specs)->first_extension >= 0 \
26 && (unsigned)(specs)->first_extension <= (memb_idx))
29 #define XER_ADVANCE(num_bytes) \
31 size_t num = (num_bytes); \
32 ptr = ((const char *)ptr) + num; \
34 consumed_myself += num; \
38 * Decode the XER (XML) data.
41 SEQUENCE_decode_xer(const asn_codec_ctx_t *opt_codec_ctx,
42 const asn_TYPE_descriptor_t *td, void **struct_ptr,
43 const char *opt_mname, const void *ptr, size_t size) {
45 * Bring closer parts of structure description.
47 const asn_SEQUENCE_specifics_t *specs
48 = (const asn_SEQUENCE_specifics_t *)td->specifics;
49 asn_TYPE_member_t *elements = td->elements;
50 const char *xml_tag = opt_mname ? opt_mname : td->xml_tag;
53 * ... and parts of the structure being constructed.
55 void *st = *struct_ptr; /* Target structure. */
56 asn_struct_ctx_t *ctx; /* Decoder context */
58 asn_dec_rval_t rval; /* Return value from a decoder */
59 ssize_t consumed_myself = 0; /* Consumed bytes from ptr */
60 size_t edx; /* Element index */
63 * Create the target structure if it is not present already.
66 st = *struct_ptr = CALLOC(1, specs->struct_size);
67 if(st == 0) RETURN(RC_FAIL);
71 * Restore parsing context.
73 ctx = (asn_struct_ctx_t *)((char *)st + specs->ctx_offset);
77 * Phases of XER/XML processing:
78 * Phase 0: Check that the opening tag matches our expectations.
79 * Phase 1: Processing body and reacting on closing tag.
80 * Phase 2: Processing inner type.
81 * Phase 3: Skipping unknown extensions.
84 for(edx = ctx->step; ctx->phase <= 3;) {
85 pxer_chunk_type_e ch_type; /* XER chunk type */
86 ssize_t ch_size; /* Chunk size */
87 xer_check_tag_e tcv; /* Tag check value */
88 asn_TYPE_member_t *elm;
91 * Go inside the inner member of a sequence.
94 asn_dec_rval_t tmprval;
95 void *memb_ptr_dontuse; /* Pointer to the member */
96 void **memb_ptr2; /* Pointer to that pointer */
98 elm = &td->elements[edx];
100 if(elm->flags & ATF_POINTER) {
101 /* Member is a pointer to another structure */
102 memb_ptr2 = (void **)((char *)st + elm->memb_offset);
104 memb_ptr_dontuse = (char *)st + elm->memb_offset;
105 memb_ptr2 = &memb_ptr_dontuse; /* Only use of memb_ptr_dontuse */
108 if(elm->flags & ATF_OPEN_TYPE) {
109 tmprval = OPEN_TYPE_xer_get(opt_codec_ctx, td, st, elm, ptr, size);
111 /* Invoke the inner type decoder, m.b. multiple times */
112 tmprval = elm->type->op->xer_decoder(opt_codec_ctx,
113 elm->type, memb_ptr2, elm->name,
116 XER_ADVANCE(tmprval.consumed);
117 if(tmprval.code != RC_OK)
118 RETURN(tmprval.code);
119 ctx->phase = 1; /* Back to body processing */
121 ASN_DEBUG("XER/SEQUENCE phase => %d, step => %d",
122 ctx->phase, ctx->step);
127 * Get the next part of the XML stream.
129 ch_size = xer_next_token(&ctx->context, ptr, size,
137 case PXER_COMMENT: /* Got XML comment */
138 case PXER_TEXT: /* Ignore free-standing text */
139 XER_ADVANCE(ch_size); /* Skip silently */
142 break; /* Check the rest down there */
146 tcv = xer_check_tag(ptr, ch_size, xml_tag);
147 ASN_DEBUG("XER/SEQUENCE: tcv = %d, ph=%d [%s]",
148 tcv, ctx->phase, xml_tag);
150 /* Skip the extensions section */
151 if(ctx->phase == 3) {
152 switch(xer_skip_unknown(tcv, &ctx->left)) {
157 XER_ADVANCE(ch_size);
160 XER_ADVANCE(ch_size);
171 if(ctx->phase == 0) break;
175 if(ctx->phase == 0) {
176 if(edx >= td->elements_count ||
177 /* Explicit OPTIONAL specs reaches the end */
178 (edx + elements[edx].optional == td->elements_count) ||
179 /* All extensions are optional */
180 IN_EXTENSION_GROUP(specs, edx)) {
181 XER_ADVANCE(ch_size);
182 ctx->phase = 4; /* Phase out */
185 ASN_DEBUG("Premature end of XER SEQUENCE");
191 if(ctx->phase == 0) {
192 XER_ADVANCE(ch_size);
193 ctx->phase = 1; /* Processing body phase */
200 ASN_DEBUG("XER/SEQUENCE: tcv=%d, ph=%d, edx=%" ASN_PRI_SIZE "",
201 tcv, ctx->phase, edx);
202 if(ctx->phase != 1) {
203 break; /* Really unexpected */
206 if(edx < td->elements_count) {
208 * Search which member corresponds to this tag.
211 size_t edx_end = edx + elements[edx].optional + 1;
212 if(edx_end > td->elements_count)
213 edx_end = td->elements_count;
214 for(n = edx; n < edx_end; n++) {
215 elm = &td->elements[n];
216 tcv = xer_check_tag(ptr, ch_size, elm->name);
221 * Process this member.
231 break; /* Phase out */
238 ASN_DEBUG("Out of defined members: %" ASN_PRI_SIZE "/%u",
239 edx, td->elements_count);
242 /* It is expected extension */
243 if(IN_EXTENSION_GROUP(specs,
244 edx + (edx < td->elements_count
245 ? elements[edx].optional : 0))) {
246 ASN_DEBUG("Got anticipated extension at %" ASN_PRI_SIZE "",
249 * Check for (XCT_BOTH or XCT_UNKNOWN_BO)
250 * By using a mask. Only record a pure
253 if(tcv & XCT_CLOSING) {
254 /* Found </extension> without body */
257 ctx->phase = 3; /* Skip ...'s */
259 XER_ADVANCE(ch_size);
268 ASN_DEBUG("Unexpected XML tag in SEQUENCE [%c%c%c%c%c%c]",
269 size>0?((const char *)ptr)[0]:'.',
270 size>1?((const char *)ptr)[1]:'.',
271 size>2?((const char *)ptr)[2]:'.',
272 size>3?((const char *)ptr)[3]:'.',
273 size>4?((const char *)ptr)[4]:'.',
274 size>5?((const char *)ptr)[5]:'.');
278 ctx->phase = 4; /* "Phase out" on hard failure */
283 SEQUENCE_encode_xer(const asn_TYPE_descriptor_t *td, const void *sptr,
284 int ilevel, enum xer_encoder_flags_e flags,
285 asn_app_consume_bytes_f *cb, void *app_key) {
286 asn_enc_rval_t er = {0,0,0};
287 int xcan = (flags & XER_F_CANONICAL);
288 asn_TYPE_descriptor_t *tmp_def_val_td = 0;
289 void *tmp_def_val = 0;
292 if(!sptr) ASN__ENCODE_FAILED;
296 for(edx = 0; edx < td->elements_count; edx++) {
297 asn_enc_rval_t tmper = {0,0,0};
298 asn_TYPE_member_t *elm = &td->elements[edx];
299 const void *memb_ptr;
300 const char *mname = elm->name;
301 unsigned int mlen = strlen(mname);
303 if(elm->flags & ATF_POINTER) {
305 *(const void *const *)((const char *)sptr + elm->memb_offset);
307 assert(tmp_def_val == 0);
308 if(elm->default_value_set) {
309 if(elm->default_value_set(&tmp_def_val)) {
312 memb_ptr = tmp_def_val;
313 tmp_def_val_td = elm->type;
315 } else if(elm->optional) {
318 /* Mandatory element is missing */
323 memb_ptr = (const void *)((const char *)sptr + elm->memb_offset);
326 if(!xcan) ASN__TEXT_INDENT(1, ilevel);
327 ASN__CALLBACK3("<", 1, mname, mlen, ">", 1);
329 /* Print the member itself */
330 tmper = elm->type->op->xer_encoder(elm->type, memb_ptr, ilevel + 1,
333 ASN_STRUCT_FREE(*tmp_def_val_td, tmp_def_val);
336 if(tmper.encoded == -1) return tmper;
337 er.encoded += tmper.encoded;
339 ASN__CALLBACK3("</", 2, mname, mlen, ">", 1);
342 if(!xcan) ASN__TEXT_INDENT(1, ilevel - 1);
346 if(tmp_def_val) ASN_STRUCT_FREE(*tmp_def_val_td, tmp_def_val);