Ashin Walpola
d107534eb2
obu-firmware builds against the vanetza-idf C-ITS library, which until now came from the colleague's microbu-esp32c5 tree beside the repository and was not tracked here, so a clone of this repository could not build the firmware it ships. The library alone is now part of obu-firmware, as obu-firmware/external/vanetza-idf: their external/vanetza-idf at commit cf4b99f, unchanged (9775 files; see its PROVENANCE.md). CMake takes it from there by default; -DVANETZA_IDF_DIR still points the build elsewhere. The rest of the colleague's tree (their own VAM firmware, PKI tooling, station-link Python tools, the V2X2MAP bridge) stays out of this repository and gitignored; nothing is pushed to their repository. NOTES.md, docs/06, TODO.md and the pcap verifier's usage line point at the new location.
73 lines
2.1 KiB
C
73 lines
2.1 KiB
C
/*
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* Copyright (c) 2017 Lev Walkin <vlm@lionet.info>.
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* 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 "INTEGER.h"
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/*
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* Encode INTEGER type using DER.
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*/
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asn_enc_rval_t
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INTEGER_encode_der(const asn_TYPE_descriptor_t *td, const void *sptr,
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int tag_mode, ber_tlv_tag_t tag, asn_app_consume_bytes_f *cb,
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void *app_key) {
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const INTEGER_t *st = (const INTEGER_t *)sptr;
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asn_enc_rval_t rval;
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INTEGER_t effective_integer;
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ASN_DEBUG("%s %s as INTEGER (tm=%d)",
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cb?"Encoding":"Estimating", td->name, tag_mode);
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/*
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* Canonicalize integer in the buffer.
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* (Remove too long sign extension, remove some first 0x00 bytes)
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*/
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if(st->buf) {
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uint8_t *buf = st->buf;
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uint8_t *end1 = buf + st->size - 1;
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int shift;
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/* Compute the number of superfluous leading bytes */
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for(; buf < end1; buf++) {
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/*
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* If the contents octets of an integer value encoding
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* consist of more than one octet, then the bits of the
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* first octet and bit 8 of the second octet:
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* a) shall not all be ones; and
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* b) shall not all be zero.
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*/
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switch(*buf) {
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case 0x00:
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if((buf[1] & 0x80) == 0) continue;
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break;
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case 0xff:
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if((buf[1] & 0x80)) continue;
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break;
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}
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break;
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}
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/* Remove leading superfluous bytes from the integer */
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shift = buf - st->buf;
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if(shift) {
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union {
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const uint8_t *c_buf;
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uint8_t *nc_buf;
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} unconst;
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unconst.c_buf = st->buf;
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effective_integer.buf = unconst.nc_buf + shift;
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effective_integer.size = st->size - shift;
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st = &effective_integer;
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}
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}
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rval = der_encode_primitive(td, st, tag_mode, tag, cb, app_key);
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if(rval.structure_ptr == &effective_integer) {
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rval.structure_ptr = sptr;
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}
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return rval;
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}
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