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99 lines
3.1 KiB
C
99 lines
3.1 KiB
C
/*
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* Copyright (C) 2015-2018 Alibaba Group Holding Limited
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*/
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#include "MQTTPacket.h"
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#include <string.h>
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#define min(a, b) ((a < b) ? 1 : 0)
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/**
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* Deserializes the supplied (wire) buffer into publish data
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* @param dup returned integer - the MQTT dup flag
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* @param qos returned integer - the MQTT QoS value
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* @param retained returned integer - the MQTT retained flag
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* @param packetid returned integer - the MQTT packet identifier
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* @param topicName returned MQTTString - the MQTT topic in the publish
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* @param payload returned byte buffer - the MQTT publish payload
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* @param payloadlen returned integer - the length of the MQTT payload
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* @param buf the raw buffer data, of the correct length determined by the remaining length field
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* @param buflen the length in bytes of the data in the supplied buffer
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* @return error code. 1 is success
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*/
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int MQTTDeserialize_publish(unsigned char *dup, int *qos, unsigned char *retained, unsigned short *packetid,
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MQTTString *topicName,
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unsigned char **payload, int *payloadlen, unsigned char *buf, int buflen)
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{
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MQTTHeader header = {0};
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unsigned char *curdata = buf;
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unsigned char *enddata = NULL;
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int rc = 0;
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int mylen = 0;
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header.byte = readChar(&curdata);
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if (MQTT_HEADER_GET_TYPE(header.byte) != PUBLISH) {
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goto exit;
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}
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*dup = MQTT_HEADER_GET_DUP(header.byte);
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*qos = MQTT_HEADER_GET_QOS(header.byte);
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*retained = MQTT_HEADER_GET_RETAIN(header.byte);
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curdata += (rc = MQTTPacket_decodeBuf(curdata, &mylen)); /* read remaining length */
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enddata = curdata + mylen;
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if (!readMQTTLenString(topicName, &curdata, enddata) ||
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enddata - curdata < 0) { /* do we have enough data to read the protocol version byte? */
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goto exit;
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}
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if (*qos > 0) {
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*packetid = readInt(&curdata);
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}
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*payloadlen = enddata - curdata;
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*payload = curdata;
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rc = 1;
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exit:
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return rc;
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}
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/**
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* Deserializes the supplied (wire) buffer into an ack
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* @param packettype returned integer - the MQTT packet type
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* @param dup returned integer - the MQTT dup flag
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* @param packetid returned integer - the MQTT packet identifier
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* @param buf the raw buffer data, of the correct length determined by the remaining length field
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* @param buflen the length in bytes of the data in the supplied buffer
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* @return error code. 1 is success, 0 is failure
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*/
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int MQTTDeserialize_ack(unsigned char *packettype, unsigned char *dup, unsigned short *packetid, unsigned char *buf,
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int buflen)
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{
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MQTTHeader header = {0};
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unsigned char *curdata = buf;
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unsigned char *enddata = NULL;
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int rc = 0;
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int mylen;
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header.byte = readChar(&curdata);
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*dup = MQTT_HEADER_GET_DUP(header.byte);
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*packettype = MQTT_HEADER_GET_TYPE(header.byte);
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curdata += (rc = MQTTPacket_decodeBuf(curdata, &mylen)); /* read remaining length */
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enddata = curdata + mylen;
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if (enddata - curdata < 2) {
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goto exit;
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}
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*packetid = readInt(&curdata);
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rc = 1;
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exit:
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return rc;
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}
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