mirror of https://github.com/ARMmbed/mbed-os.git
147 lines
3.9 KiB
C
147 lines
3.9 KiB
C
/*
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* Copyright (c) 2018-2019, Arm Limited and affiliates.
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* SPDX-License-Identifier: Apache-2.0
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "nsconfig.h"
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#include <string.h>
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#include "ns_types.h"
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#include "ns_list.h"
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#include "ns_trace.h"
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#include "nsdynmemLIB.h"
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#include "common_functions.h"
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#include "mac_common_defines.h"
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#include "ws_mpx_header.h"
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bool ws_llc_mpx_header_frame_parse(uint8_t *ptr, uint16_t length, mpx_msg_t *msg)
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{
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if (!length) {
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return false;
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}
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memset(msg, 0, sizeof(mpx_msg_t));
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bool fragmented_number_present = false;
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bool multiplex_id_present = false;
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bool fragment_total_size = false;
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msg->transfer_type = *ptr & 7;
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msg->transaction_id = ((*ptr++ & 0xf8) >> 3);
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length--;
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switch (msg->transfer_type) {
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case MPX_FT_FULL_FRAME:
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multiplex_id_present = true;
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break;
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case MPX_FT_FULL_FRAME_SMALL_MULTILEX_ID:
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break;
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case MPX_FT_FIRST_OR_SUB_FRAGMENT:
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case MPX_FT_LAST_FRAGMENT:
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fragmented_number_present = true;
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if (length < 2) {
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return false;
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}
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break;
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case MPX_FT_ABORT:
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if (length == 2) {
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fragment_total_size = true;
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} else if (length) {
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return false;
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}
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break;
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default:
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return false;
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}
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if (fragmented_number_present) {
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msg->fragment_number = *ptr++;
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length--;
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if (msg->fragment_number == 0) { //First fragment
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fragment_total_size = true;
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multiplex_id_present = true;
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}
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}
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if (fragment_total_size) {
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if (length < 2) {
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return false;
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}
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msg->total_upper_layer_size = common_read_16_bit_inverse(ptr);
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ptr += 2;
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length -= 2;
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}
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if (multiplex_id_present) {
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if (length < 3) {
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return false;
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}
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msg->multiplex_id = common_read_16_bit_inverse(ptr);
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ptr += 2;
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length -= 2;
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}
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msg->frame_ptr = ptr;
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msg->frame_length = length;
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return true;
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}
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uint8_t *ws_llc_mpx_header_write(uint8_t *ptr, const mpx_msg_t *msg)
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{
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bool fragmented_number_present = false;
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bool multiplex_id_present = false;
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bool fragment_total_size = false;
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*ptr = msg->transfer_type;
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*ptr++ |= ((msg->transaction_id << 3) & 0xf8);
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switch (msg->transfer_type) {
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case MPX_FT_FULL_FRAME:
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multiplex_id_present = true;
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break;
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case MPX_FT_FULL_FRAME_SMALL_MULTILEX_ID:
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break;
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case MPX_FT_FIRST_OR_SUB_FRAGMENT:
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case MPX_FT_LAST_FRAGMENT:
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fragmented_number_present = true;
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if (msg->fragment_number == 0) {
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fragment_total_size = true;
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multiplex_id_present = true;
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}
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break;
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case MPX_FT_ABORT:
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if (msg->total_upper_layer_size) {
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fragment_total_size = true;
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}
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break;
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default:
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break;
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}
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if (fragmented_number_present) {
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*ptr++ = msg->fragment_number;
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}
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if (fragment_total_size) {
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ptr = common_write_16_bit_inverse(msg->total_upper_layer_size, ptr);
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}
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if (multiplex_id_present) {
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ptr = common_write_16_bit_inverse(msg->multiplex_id, ptr);
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}
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return ptr;
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}
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