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/* ----------------------------------------------------------------------------
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* Copyright (c) Huawei Technologies Co., Ltd. 2020-2020. All rights reserved.
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* Description: LiteOS Trace Tlv Implementation
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* Author: Huawei LiteOS Team
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* Create: 2020-03-31
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* Redistribution and use in source and binary forms, with or without modification,
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* are permitted provided that the following conditions are met:
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* 1. Redistributions of source code must retain the above copyright notice, this list of
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* conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright notice, this list
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* of conditions and the following disclaimer in the documentation and/or other materials
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* provided with the distribution.
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* 3. Neither the name of the copyright holder nor the names of its contributors may be used
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* to endorse or promote products derived from this software without specific prior written
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* permission.
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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* --------------------------------------------------------------------------- */
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#include "trace_tlv.h"
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#include "securec.h"
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#ifdef __cplusplus
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#if __cplusplus
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extern "C" {
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#endif /* __cplusplus */
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#endif /* __cplusplus */
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#define CRC_WIDTH 8 //CRCµÄλ¿í//
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#define CRC_POLY 0x1021 //CRC¶àÏîʽ//
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#define CRC_TOPBIT 0x8000 //CRC¼ÆËãÖеÄ×î¸ßλ//
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STATIC UINT16 CalcCrc16(const UINT8 *buf, UINT32 len) //ÓÃÓÚ¼ÆËã16λCRCУÑéÖµ//
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{
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UINT32 i;
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UINT16 crc = 0;
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for (; len > 0; len--) {
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crc = crc ^ (*buf++ << CRC_WIDTH);
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for (i = 0; i < CRC_WIDTH; i++) {
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if (crc & CRC_TOPBIT) {
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crc = (crc << 1) ^ CRC_POLY;
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} else {
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crc <<= 1;
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}
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}
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}
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return crc;
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}
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STATIC UINT32 OsWriteTlv(UINT8 *tlvBuf, UINT8 type, UINT8 len, UINT8 *value) //½«TLVÊý¾ÝдÈëTLV»º³åÇø//
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{
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TraceMsgTlvBody *body = (TraceMsgTlvBody *)tlvBuf;
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if (len == 0) {
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return 0;
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}
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body->type = type;
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body->len = len;
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/* Do not check return value for performance, if copy failed, only this package will be discarded */
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(VOID)memcpy_s(body->value, len, value, len);
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return len + sizeof(body->type) + sizeof(body->len); //·µ»Øʵ¼ÊдÈëµÄ×Ö½ÚÊý//
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}
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/*¸ù¾ÝTLV±íÖеĶ¨Ò壬½«Ô´Êý¾Ý±àÂë³ÉTLV¸ñʽ²¢Ð´ÈëTLV»º³åÇø*/
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STATIC UINT32 OsTlvEncode(const TlvTable *table, UINT8 *srcBuf, UINT8 *tlvBuf, INT32 tlvBufLen)
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{
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UINT32 len = 0;
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const TlvTable *tlvTableItem = table;
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while (tlvTableItem->tag != TRACE_TLV_TYPE_NULL) {
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if ((len + tlvTableItem->elemSize + sizeof(UINT8) + sizeof(UINT8)) > tlvBufLen) {
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break;
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}
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len += OsWriteTlv(tlvBuf + len, tlvTableItem->tag, tlvTableItem->elemSize, srcBuf + tlvTableItem->elemOffset);
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tlvTableItem++;
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}
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return len;
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}
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/*½«Ô´Êý¾Ý°´ÕÕTLV±íµÄ¶¨Òå±àÂ룬²¢Ð´ÈëÄ¿±ê»º³åÇø*/
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UINT32 OsTraceDataEncode(UINT8 type, const TlvTable *table, UINT8 *src, UINT8 *dest, INT32 destLen)
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{
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UINT16 crc;
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INT32 len;
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INT32 tlvBufLen;
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UINT8 *tlvBuf = NULL;
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TraceMsgTlvHead *head = (TraceMsgTlvHead *)dest;
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tlvBufLen = destLen - sizeof(TraceMsgTlvHead);
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if ((tlvBufLen <= 0) || (table == NULL)) {
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return 0;
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}
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tlvBuf = dest + sizeof(TraceMsgTlvHead);
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len = OsTlvEncode(table, src, tlvBuf, tlvBufLen);
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crc = CalcCrc16(tlvBuf, len);
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head->magicNum = TRACE_TLV_MSG_HEAD;
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head->msgType = type;
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head->len = len;
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head->crc = crc;
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return len + sizeof(TraceMsgTlvHead);
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}
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#ifdef __cplusplus
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#if __cplusplus
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}
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#endif /* __cplusplus */
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#endif /* __cplusplus */
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