--- /dev/null
+/*
+ * Copyright (c) 2017 Lev Walkin <vlm@lionet.info>.
+ * All rights reserved.
+ * Redistribution and modifications are permitted subject to BSD license.
+ */
+#include <asn_internal.h>
+#include <constr_SET_OF.h>
+#include <asn_SET_OF.h>
+
+/*
+ * Number of bytes left for this structure.
+ * (ctx->left) indicates the number of bytes _transferred_ for the structure.
+ * (size) contains the number of bytes in the buffer passed.
+ */
+#define LEFT ((size<(size_t)ctx->left)?size:(size_t)ctx->left)
+
+/*
+ * If the subprocessor function returns with an indication that it wants
+ * more data, it may well be a fatal decoding problem, because the
+ * size is constrained by the <TLV>'s L, even if the buffer size allows
+ * reading more data.
+ * For example, consider the buffer containing the following TLVs:
+ * <T:5><L:1><V> <T:6>...
+ * The TLV length clearly indicates that one byte is expected in V, but
+ * if the V processor returns with "want more data" even if the buffer
+ * contains way more data than the V processor have seen.
+ */
+#define SIZE_VIOLATION (ctx->left >= 0 && (size_t)ctx->left <= size)
+
+/*
+ * This macro "eats" the part of the buffer which is definitely "consumed",
+ * i.e. was correctly converted into local representation or rightfully skipped.
+ */
+#undef ADVANCE
+#define ADVANCE(num_bytes) \
+ do { \
+ size_t num = num_bytes; \
+ ptr = ((const char *)ptr) + num; \
+ size -= num; \
+ if(ctx->left >= 0) \
+ ctx->left -= num; \
+ consumed_myself += num; \
+ } while(0)
+
+/*
+ * Switch to the next phase of parsing.
+ */
+#undef NEXT_PHASE
+#define NEXT_PHASE(ctx) \
+ do { \
+ ctx->phase++; \
+ ctx->step = 0; \
+ } while(0)
+#undef PHASE_OUT
+#define PHASE_OUT(ctx) \
+ do { \
+ ctx->phase = 10; \
+ } while(0)
+
+/*
+ * Return a standardized complex structure.
+ */
+#undef RETURN
+#define RETURN(_code) \
+ do { \
+ rval.code = _code; \
+ rval.consumed = consumed_myself; \
+ return rval; \
+ } while(0)
+
+/*
+ * The decoder of the SET OF type.
+ */
+asn_dec_rval_t
+SET_OF_decode_ber(const asn_codec_ctx_t *opt_codec_ctx,
+ const asn_TYPE_descriptor_t *td, void **struct_ptr,
+ const void *ptr, size_t size, int tag_mode) {
+ /*
+ * Bring closer parts of structure description.
+ */
+ const asn_SET_OF_specifics_t *specs = (const asn_SET_OF_specifics_t *)td->specifics;
+ const asn_TYPE_member_t *elm = td->elements; /* Single one */
+
+ /*
+ * Parts of the structure being constructed.
+ */
+ void *st = *struct_ptr; /* Target structure. */
+ asn_struct_ctx_t *ctx; /* Decoder context */
+
+ ber_tlv_tag_t tlv_tag; /* T from TLV */
+ asn_dec_rval_t rval; /* Return code from subparsers */
+
+ ssize_t consumed_myself = 0; /* Consumed bytes from ptr */
+
+ ASN_DEBUG("Decoding %s as SET OF", td->name);
+
+ /*
+ * Create the target structure if it is not present already.
+ */
+ if(st == 0) {
+ st = *struct_ptr = CALLOC(1, specs->struct_size);
+ if(st == 0) {
+ RETURN(RC_FAIL);
+ }
+ }
+
+ /*
+ * Restore parsing context.
+ */
+ ctx = (asn_struct_ctx_t *)((char *)st + specs->ctx_offset);
+
+ /*
+ * Start to parse where left previously
+ */
+ switch(ctx->phase) {
+ case 0:
+ /*
+ * PHASE 0.
+ * Check that the set of tags associated with given structure
+ * perfectly fits our expectations.
+ */
+
+ rval = ber_check_tags(opt_codec_ctx, td, ctx, ptr, size,
+ tag_mode, 1, &ctx->left, 0);
+ if(rval.code != RC_OK) {
+ ASN_DEBUG("%s tagging check failed: %d",
+ td->name, rval.code);
+ return rval;
+ }
+
+ if(ctx->left >= 0)
+ ctx->left += rval.consumed; /* ?Subtracted below! */
+ ADVANCE(rval.consumed);
+
+ ASN_DEBUG("Structure consumes %ld bytes, "
+ "buffer %ld", (long)ctx->left, (long)size);
+
+ NEXT_PHASE(ctx);
+ /* Fall through */
+ case 1:
+ /*
+ * PHASE 1.
+ * From the place where we've left it previously,
+ * try to decode the next item.
+ */
+ for(;; ctx->step = 0) {
+ ssize_t tag_len; /* Length of TLV's T */
+
+ if(ctx->step & 1)
+ goto microphase2;
+
+ /*
+ * MICROPHASE 1: Synchronize decoding.
+ */
+
+ if(ctx->left == 0) {
+ ASN_DEBUG("End of SET OF %s", td->name);
+ /*
+ * No more things to decode.
+ * Exit out of here.
+ */
+ PHASE_OUT(ctx);
+ RETURN(RC_OK);
+ }
+
+ /*
+ * Fetch the T from TLV.
+ */
+ tag_len = ber_fetch_tag(ptr, LEFT, &tlv_tag);
+ switch(tag_len) {
+ case 0: if(!SIZE_VIOLATION) RETURN(RC_WMORE);
+ /* Fall through */
+ case -1: RETURN(RC_FAIL);
+ }
+
+ if(ctx->left < 0 && ((const uint8_t *)ptr)[0] == 0) {
+ if(LEFT < 2) {
+ if(SIZE_VIOLATION)
+ RETURN(RC_FAIL);
+ else
+ RETURN(RC_WMORE);
+ } else if(((const uint8_t *)ptr)[1] == 0) {
+ /*
+ * Found the terminator of the
+ * indefinite length structure.
+ */
+ break;
+ }
+ }
+
+ /* Outmost tag may be unknown and cannot be fetched/compared */
+ if(elm->tag != (ber_tlv_tag_t)-1) {
+ if(BER_TAGS_EQUAL(tlv_tag, elm->tag)) {
+ /*
+ * The new list member of expected type has arrived.
+ */
+ } else {
+ ASN_DEBUG("Unexpected tag %s fixed SET OF %s",
+ ber_tlv_tag_string(tlv_tag), td->name);
+ ASN_DEBUG("%s SET OF has tag %s",
+ td->name, ber_tlv_tag_string(elm->tag));
+ RETURN(RC_FAIL);
+ }
+ }
+
+ /*
+ * MICROPHASE 2: Invoke the member-specific decoder.
+ */
+ ctx->step |= 1; /* Confirm entering next microphase */
+ microphase2:
+
+ /*
+ * Invoke the member fetch routine according to member's type
+ */
+ rval = elm->type->op->ber_decoder(opt_codec_ctx,
+ elm->type, &ctx->ptr,
+ ptr, LEFT, 0);
+ ASN_DEBUG("In %s SET OF %s code %d consumed %d",
+ td->name, elm->type->name,
+ rval.code, (int)rval.consumed);
+ switch(rval.code) {
+ case RC_OK:
+ {
+ asn_anonymous_set_ *list = _A_SET_FROM_VOID(st);
+ if(ASN_SET_ADD(list, ctx->ptr) != 0)
+ RETURN(RC_FAIL);
+ else
+ ctx->ptr = 0;
+ }
+ break;
+ case RC_WMORE: /* More data expected */
+ if(!SIZE_VIOLATION) {
+ ADVANCE(rval.consumed);
+ RETURN(RC_WMORE);
+ }
+ /* Fall through */
+ case RC_FAIL: /* Fatal error */
+ ASN_STRUCT_FREE(*elm->type, ctx->ptr);
+ ctx->ptr = 0;
+ RETURN(RC_FAIL);
+ } /* switch(rval) */
+
+ ADVANCE(rval.consumed);
+ } /* for(all list members) */
+
+ NEXT_PHASE(ctx);
+ case 2:
+ /*
+ * Read in all "end of content" TLVs.
+ */
+ while(ctx->left < 0) {
+ if(LEFT < 2) {
+ if(LEFT > 0 && ((const char *)ptr)[0] != 0) {
+ /* Unexpected tag */
+ RETURN(RC_FAIL);
+ } else {
+ RETURN(RC_WMORE);
+ }
+ }
+ if(((const char *)ptr)[0] == 0
+ && ((const char *)ptr)[1] == 0) {
+ ADVANCE(2);
+ ctx->left++;
+ } else {
+ RETURN(RC_FAIL);
+ }
+ }
+
+ PHASE_OUT(ctx);
+ }
+
+ RETURN(RC_OK);
+}
+
+/*
+ * The DER encoder of the SET OF type.
+ */
+asn_enc_rval_t
+SET_OF_encode_der(const asn_TYPE_descriptor_t *td, const void *sptr,
+ int tag_mode, ber_tlv_tag_t tag, asn_app_consume_bytes_f *cb,
+ void *app_key) {
+ const asn_TYPE_member_t *elm = td->elements;
+ const asn_anonymous_set_ *list = _A_CSET_FROM_VOID(sptr);
+ size_t computed_size = 0;
+ ssize_t encoding_size = 0;
+ struct _el_buffer *encoded_els;
+ int edx;
+
+ ASN_DEBUG("Estimating size for SET OF %s", td->name);
+
+ /*
+ * Gather the length of the underlying members sequence.
+ */
+ for(edx = 0; edx < list->count; edx++) {
+ void *memb_ptr = list->array[edx];
+ asn_enc_rval_t erval = {0,0,0};
+
+ if(!memb_ptr) ASN__ENCODE_FAILED;
+
+ erval =
+ elm->type->op->der_encoder(elm->type, memb_ptr, 0, elm->tag, 0, 0);
+ if(erval.encoded == -1) return erval;
+ computed_size += erval.encoded;
+ }
+
+ /*
+ * Encode the TLV for the sequence itself.
+ */
+ encoding_size =
+ der_write_tags(td, computed_size, tag_mode, 1, tag, cb, app_key);
+ if(encoding_size < 0) {
+ ASN__ENCODE_FAILED;
+ }
+ computed_size += encoding_size;
+
+ if(!cb || list->count == 0) {
+ asn_enc_rval_t erval = {0,0,0};
+ erval.encoded = computed_size;
+ ASN__ENCODED_OK(erval);
+ }
+
+ ASN_DEBUG("Encoding members of %s SET OF", td->name);
+
+ /*
+ * DER mandates dynamic sorting of the SET OF elements
+ * according to their encodings. Build an array of the
+ * encoded elements.
+ */
+ encoded_els = SET_OF__encode_sorted(elm, list, SOES_DER);
+
+ /*
+ * Report encoded elements to the application.
+ * Dispose of temporary sorted members table.
+ */
+ for(edx = 0; edx < list->count; edx++) {
+ struct _el_buffer *encoded_el = &encoded_els[edx];
+ /* Report encoded chunks to the application */
+ if(cb(encoded_el->buf, encoded_el->length, app_key) < 0) {
+ break;
+ } else {
+ encoding_size += encoded_el->length;
+ }
+ }
+
+ SET_OF__encode_sorted_free(encoded_els, list->count);
+
+ if(edx == list->count) {
+ asn_enc_rval_t erval = {0,0,0};
+ assert(computed_size == (size_t)encoding_size);
+ erval.encoded = computed_size;
+ ASN__ENCODED_OK(erval);
+ } else {
+ ASN__ENCODE_FAILED;
+ }
+}
Code Review / sim / e2-interface.git / blobdiff