+++ /dev/null
-/*
- * Copyright (c) 2017 Lev Walkin <vlm@lionet.info>.
- * All rights reserved.
- * Redistribution and modifications are permitted subject to BSD license.
- */
-#ifndef ASN_DISABLE_OER_SUPPORT
-
-#include <asn_internal.h>
-#include <INTEGER.h>
-#include <errno.h>
-
-asn_dec_rval_t
-INTEGER_decode_oer(const asn_codec_ctx_t *opt_codec_ctx,
- const asn_TYPE_descriptor_t *td,
- const asn_oer_constraints_t *constraints, void **sptr,
- const void *ptr, size_t size) {
- const asn_INTEGER_specifics_t *specs =
- (const asn_INTEGER_specifics_t *)td->specifics;
- asn_dec_rval_t rval = {RC_OK, 0};
- INTEGER_t *st = (INTEGER_t *)*sptr;
- struct asn_oer_constraint_number_s ct = {0, 0};
- size_t req_bytes;
-
- (void)opt_codec_ctx;
- (void)specs;
-
- if(!st) {
- st = (INTEGER_t *)(*sptr = CALLOC(1, sizeof(*st)));
- if(!st) ASN__DECODE_FAILED;
- }
-
- FREEMEM(st->buf);
- st->buf = 0;
- st->size = 0;
-
- if(!constraints) constraints = td->encoding_constraints.oer_constraints;
- if(constraints) ct = constraints->value;
-
- if(ct.width) {
- req_bytes = ct.width;
- } else {
- /* No lower bound and no upper bound, effectively */
-
- ssize_t consumed = oer_fetch_length(ptr, size, &req_bytes);
- if(consumed == 0) {
- ASN__DECODE_STARVED;
- } else if(consumed == -1) {
- ASN__DECODE_FAILED;
- }
- rval.consumed += consumed;
- ptr = (const char *)ptr + consumed;
- size -= consumed;
- }
-
- if(req_bytes > size) {
- ASN__DECODE_STARVED;
- }
-
- if(ct.positive) {
- /* X.969 08/2015 10.2(a) */
- unsigned msb; /* Most significant bit */
- size_t useful_size;
-
- /* Check most significant bit */
- msb = *(const uint8_t *)ptr >> 7; /* yields 0 or 1 */
- useful_size = msb + req_bytes;
- st->buf = (uint8_t *)MALLOC(useful_size + 1);
- if(!st->buf) {
- ASN__DECODE_FAILED;
- }
-
- /*
- * Record a large unsigned in a way not to confuse it
- * with signed value.
- */
- st->buf[0] = '\0';
- memcpy(st->buf + msb, ptr, req_bytes);
- st->buf[useful_size] = '\0'; /* Just in case, 0-terminate */
- st->size = useful_size;
-
- rval.consumed += req_bytes;
- return rval;
- } else {
- /* X.969 08/2015 10.2(b) */
- st->buf = (uint8_t *)MALLOC(req_bytes + 1);
- if(!st->buf) {
- ASN__DECODE_FAILED;
- }
-
- memcpy(st->buf, ptr, req_bytes);
- st->buf[req_bytes] = '\0'; /* Just in case, 0-terminate */
- st->size = req_bytes;
-
- rval.consumed += req_bytes;
- return rval;
- }
-}
-
-/*
- * Encode as Canonical OER.
- */
-asn_enc_rval_t
-INTEGER_encode_oer(const asn_TYPE_descriptor_t *td,
- const asn_oer_constraints_t *constraints, const void *sptr,
- asn_app_consume_bytes_f *cb, void *app_key) {
- const INTEGER_t *st = sptr;
- asn_enc_rval_t er = {0,0,0};
- struct asn_oer_constraint_number_s ct = {0, 0};
- const uint8_t *buf;
- const uint8_t *end;
- size_t useful_bytes;
- size_t req_bytes = 0;
- int sign = 0;
-
- if(!st || st->size == 0) ASN__ENCODE_FAILED;
-
- if(!constraints) constraints = td->encoding_constraints.oer_constraints;
- if(constraints) ct = constraints->value;
-
- er.encoded = 0;
-
- buf = st->buf;
- end = buf + st->size;
-
- sign = (buf && buf < end) ? buf[0] & 0x80 : 0;
-
- /* Ignore 9 leading zeroes or ones */
- if(ct.positive) {
- if(sign) {
- /* The value given is a signed value. Can't proceed. */
- ASN__ENCODE_FAILED;
- }
- /* Remove leading zeros. */
- for(; buf + 1 < end; buf++) {
- if(buf[0] != 0x0) break;
- }
- } else {
- for(; buf + 1 < end; buf++) {
- if(buf[0] == 0x0 && (buf[1] & 0x80) == 0) {
- continue;
- } else if(buf[0] == 0xff && (buf[1] & 0x80) != 0) {
- continue;
- }
- break;
- }
- }
-
- useful_bytes = end - buf;
- if(ct.width) {
- req_bytes = ct.width;
- } else {
- ssize_t r = oer_serialize_length(useful_bytes, cb, app_key);
- if(r < 0) {
- ASN__ENCODE_FAILED;
- }
- er.encoded += r;
- req_bytes = useful_bytes;
- }
-
- if(req_bytes < useful_bytes) {
- ASN__ENCODE_FAILED;
- }
-
- er.encoded += req_bytes;
-
- for(; req_bytes > useful_bytes; req_bytes--) {
- if(cb(sign?"\xff":"\0", 1, app_key) < 0) {
- ASN__ENCODE_FAILED;
- }
- }
-
- if(cb(buf, useful_bytes, app_key) < 0) {
- ASN__ENCODE_FAILED;
- }
-
- ASN__ENCODED_OK(er);
-}
-
-#endif /* ASN_DISABLE_OER_SUPPORT */