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123 lines
3.6 KiB
C
123 lines
3.6 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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/**
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* Determines the length of the MQTT subscribe packet that would be produced using the supplied parameters
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* @param count the number of topic filter strings in topicFilters
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* @param topicFilters the array of topic filter strings to be used in the publish
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* @return the length of buffer needed to contain the serialized version of the packet
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*/
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int MQTTSerialize_subscribeLength(int count, MQTTString topicFilters[])
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{
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int i;
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int len = 2; /* packetid */
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for (i = 0; i < count; ++i) {
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len += 2 + MQTTstrlen(topicFilters[i]) + 1; /* length + topic + req_qos */
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}
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return len;
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}
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/**
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* Serializes the supplied subscribe data into the supplied buffer, ready for sending
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* @param buf the buffer into which the packet will be serialized
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* @param buflen the length in bytes of the supplied bufferr
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* @param dup integer - the MQTT dup flag
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* @param packetid integer - the MQTT packet identifier
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* @param count - number of members in the topicFilters and reqQos arrays
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* @param topicFilters - array of topic filter names
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* @param requestedQoSs - array of requested QoS
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* @return the length of the serialized data. <= 0 indicates error
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*/
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int MQTTSerialize_subscribe(unsigned char *buf, int buflen, unsigned char dup, unsigned short packetid, int count,
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MQTTString topicFilters[], int requestedQoSs[])
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{
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unsigned char *ptr = buf;
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MQTTHeader header = {0};
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int rem_len = 0;
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int rc = 0;
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int i = 0;
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if (MQTTPacket_len(rem_len = MQTTSerialize_subscribeLength(count, topicFilters)) > buflen) {
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rc = MQTTPACKET_BUFFER_TOO_SHORT;
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goto exit;
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}
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header.byte = 0;
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MQTT_HEADER_SET_TYPE(header.byte, SUBSCRIBE);
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MQTT_HEADER_SET_DUP(header.byte, dup);
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MQTT_HEADER_SET_QOS(header.byte, 1);
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writeChar(&ptr, header.byte); /* write header */
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ptr += MQTTPacket_encode(ptr, rem_len); /* write remaining length */;
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writeInt(&ptr, packetid);
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for (i = 0; i < count; ++i) {
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writeMQTTString(&ptr, topicFilters[i]);
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writeChar(&ptr, requestedQoSs[i]);
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}
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rc = ptr - buf;
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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 suback data
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* @param packetid returned integer - the MQTT packet identifier
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* @param maxcount - the maximum number of members allowed in the grantedQoSs array
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* @param count returned integer - number of members in the grantedQoSs array
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* @param grantedQoSs returned array of integers - the granted qualities of service
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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_suback(unsigned short *packetid, int maxcount, int *count, int grantedQoSs[], 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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if (MQTT_HEADER_GET_TYPE(header.byte) != SUBACK) {
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goto exit;
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}
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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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*count = 0;
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while (curdata < enddata) {
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if (*count >= maxcount) {
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rc = -1;
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goto exit;
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}
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grantedQoSs[(*count)++] = readChar(&curdata);
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}
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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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