Keep the colleague's microbu-esp32c5 tree in this repository

obu-firmware builds against vanetza-idf from microbu-esp32c5/external, but
that tree was gitignored, so a clone of this repository could not build the
firmware it ships. It is now committed here as ordinary files in its own
folder, microbu-esp32c5/: the colleague's commit cf4b99f plus the V2X2MAP
bridge's signature verification (--trust) used on the bench. Nothing is
fetched from or pushed to the colleague's repository; this repository and
its remotes carry everything. The folder's own .gitignore keeps build output,
downloaded components and private key material out, as it did there; the
committed file set is identical to that repository's tracked files.

The ESP32-C5 is still flashed from obu-firmware/, which only takes
vanetza-idf from microbu-esp32c5/, so the two stay separate folders.
FLASHING.md says how to take a newer version of the colleague's tree (copy
it over the folder, rebuild, test, commit).

microbu-esp32c5/external/vanetza-idf/vanetza/asn1/support/NativeEnumerated_aper.c

@@ -0,0 +1,155 @@
+/*
+ * 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 "NativeEnumerated.h"
+
+asn_dec_rval_t
+NativeEnumerated_decode_aper(const asn_codec_ctx_t *opt_codec_ctx,
+                             const asn_TYPE_descriptor_t *td,
+                             const asn_per_constraints_t *constraints,
+                             void **sptr, asn_per_data_t *pd) {
+    const asn_INTEGER_specifics_t *specs = (const asn_INTEGER_specifics_t *)td->specifics;
+    asn_dec_rval_t rval = { RC_OK, 0 };
+    long *native = (long *)*sptr;
+    const asn_per_constraint_t *ct;
+    long value;
+
+    (void)opt_codec_ctx;
+
+    if(constraints) ct = &constraints->value;
+    else if(td->encoding_constraints.per_constraints)
+        ct = &td->encoding_constraints.per_constraints->value;
+    else ASN__DECODE_FAILED;  /* Mandatory! */
+    if(!specs) ASN__DECODE_FAILED;
+
+    if(!native) {
+        native = (long *)(*sptr = CALLOC(1, sizeof(*native)));
+        if(!native) ASN__DECODE_FAILED;
+    }
+
+    ASN_DEBUG("Decoding %s as NativeEnumerated", td->name);
+
+    if(ct->flags & APC_EXTENSIBLE) {
+        int inext = per_get_few_bits(pd, 1);
+        if(inext < 0) ASN__DECODE_STARVED;
+        if(inext) ct = 0;
+    }
+
+    /* Deal with APER padding */
+    if(ct && ct->upper_bound >= 255) {
+        int padding = 0;
+        padding = (8 - (pd->moved % 8)) % 8;
+        ASN_DEBUG("For NativeEnumerated %s,offset = %zu Padding bits = %d",
+                  td->name, pd->moved, padding);
+        ASN_DEBUG("For NativeEnumerated %s, upper bound = %llu",
+                  td->name, (unsigned long long)ct->upper_bound);
+        if(padding > 0)
+            per_get_few_bits(pd, padding);
+    }
+
+    if(ct && ct->range_bits >= 0) {
+        value = per_get_few_bits(pd, ct->range_bits);
+        if(value < 0) ASN__DECODE_STARVED;
+        if(value >= (specs->extension
+             ? specs->extension - 1 : specs->map_count))
+        ASN__DECODE_FAILED;
+    } else {
+        if(!specs->extension)
+            ASN__DECODE_FAILED;
+        /*
+         * X.691, #10.6: normally small non-negative whole number;
+         */
+
+        /* XXX handle indefinite index length > 64k */
+        value = aper_get_nsnnwn(pd);
+        if(value < 0) ASN__DECODE_STARVED;
+        value += specs->extension - 1;
+        //if(value >= specs->map_count)
+        //    ASN__DECODE_FAILED;
+        if(value >= specs->map_count) {
+            ASN_DEBUG("Decoded unknown index value %s = %ld", td->name, value);
+            /* unknown index. Workaround => set the first enumeration value */
+            *native = specs->value2enum[0].nat_value;
+            return rval;
+        }
+    }
+
+    *native = specs->value2enum[value].nat_value;
+    ASN_DEBUG("Decoded %s = %ld", td->name, *native);
+
+    return rval;
+}
+
+asn_enc_rval_t
+NativeEnumerated_encode_aper(const asn_TYPE_descriptor_t *td,
+                             const asn_per_constraints_t *constraints,
+                             const void *sptr, asn_per_outp_t *po) {
+    const asn_INTEGER_specifics_t *specs = (const asn_INTEGER_specifics_t *)td->specifics;
+    asn_enc_rval_t er = {0,0,0};
+    long native, value;
+    const asn_per_constraint_t *ct;
+    int inext = 0, range_bits = 1;
+    asn_INTEGER_enum_map_t key;
+    asn_INTEGER_enum_map_t *kf;
+
+    if(!sptr) ASN__ENCODE_FAILED;
+    if(!specs) ASN__ENCODE_FAILED;
+
+    if(constraints) ct = &constraints->value;
+    else if(td->encoding_constraints.per_constraints)
+        ct = &td->encoding_constraints.per_constraints->value;
+    else ASN__ENCODE_FAILED;  /* Mandatory! */
+
+    ASN_DEBUG("Encoding %s as NativeEnumerated", td->name);
+
+    er.encoded = 0;
+
+    native = *(const long *)sptr;
+    if(native < 0) ASN__ENCODE_FAILED;
+
+    key.nat_value = native;
+    kf = bsearch(&key, specs->value2enum, specs->map_count,
+                 sizeof(key), NativeEnumerated__compar_value2enum);
+    if(!kf) {
+        ASN_DEBUG("No element corresponds to %ld", native);
+        ASN__ENCODE_FAILED;
+    }
+    value = kf - specs->value2enum;
+
+    if(ct->range_bits >= 0) {
+        int cmpWith = specs->extension
+              ? specs->extension - 1 : specs->map_count;
+        if(value >= cmpWith)
+            inext = 1;
+    }
+    if(ct->flags & APC_EXTENSIBLE) {
+        if(per_put_few_bits(po, inext, 1))
+            ASN__ENCODE_FAILED;
+        if(inext) range_bits = 0;
+    } else if(inext) {
+        ASN__ENCODE_FAILED;
+    }
+
+    if(range_bits && ct && ct->range_bits >= 0) {
+        if(per_put_few_bits(po, value, ct->range_bits))
+            ASN__ENCODE_FAILED;
+        ASN__ENCODED_OK(er);
+    }
+
+    if(!specs->extension)
+        ASN__ENCODE_FAILED;
+
+    /*
+     * X.691, #10.6: normally small non-negative whole number;
+     */
+    ASN_DEBUG("value = %ld, ext = %d, inext = %d, res = %ld",
+              value, specs->extension, inext,
+              value - (inext ? (specs->extension - 1) : 0));
+    if(aper_put_nsnnwn(po, value - (inext ? (specs->extension - 1) : 0)))
+        ASN__ENCODE_FAILED;
+
+    ASN__ENCODED_OK(er);
+}