Annotation of mqtt/src/pub.c, revision 1.2
1.2 ! misho 1: #include "global.h"
! 2:
! 3:
! 4: /* ------------------------------------------------------------------- */
! 5:
! 6: /*
! 7: * mqtt_msgPUBLISH() Create PUBLISH message
! 8: *
! 9: * @buf = Message buffer
! 10: * @csTopic = Publish topic
! 11: * @msgID = MessageID >0, if QOS != MQTT_QOS_ONCE
! 12: * @Dup = Duplicate message
! 13: * @QOS = QoS
! 14: * @Retain = Retain message
! 15: * @pData = Publish data into topic
! 16: * @datlen = Publish data length
! 17: * return: -1 error or >-1 message size for send
! 18: */
! 19: int
! 20: mqtt_msgPUBLISH(mqtt_msg_t * __restrict buf, const char *csTopic, u_short msgID,
! 21: u_char Dup, u_char QOS, u_char Retain, const void *pData, int datlen)
! 22: {
! 23: int siz = 0;
! 24: struct mqtthdr *hdr;
! 25: mqtthdr_var_t *topic;
! 26: mqtt_v_t *mid;
! 27: void *data;
! 28:
! 29: if (!buf || !csTopic)
! 30: return -1;
! 31: if (QOS > MQTT_QOS_EXACTLY) {
! 32: mqtt_SetErr(EINVAL, "Error:: invalid QoS parameter");
! 33: return -1;
! 34: }
! 35: if (!msgID && QOS != MQTT_QOS_ONCE) {
! 36: mqtt_SetErr(EINVAL, "Error:: invalid MessageID parameter must be >0");
! 37: return -1;
! 38: }
! 39:
! 40: if (mqtt_msgRealloc(buf, MQTTMSG_MAX) == -1)
! 41: return -1;
! 42: else {
! 43: hdr = (struct mqtthdr *) (buf->msg_base + siz);
! 44: siz += sizeof(struct mqtthdr);
! 45: }
! 46:
! 47: /* variable header */
! 48: topic = (mqtthdr_var_t*) (buf->msg_base + siz);
! 49: topic->var_sb.val = htons(strlen(csTopic));
! 50: memcpy(topic->var_data, csTopic, ntohs(topic->var_sb.val));
! 51: siz += MQTTHDR_VAR_SIZEOF(topic);
! 52:
! 53: mid = (mqtt_v_t*) (buf->msg_base + siz);
! 54: mid->val = htons(msgID);
! 55: siz += sizeof(mqtt_v_t);
! 56:
! 57: /* load with data */
! 58: if (pData && datlen) {
! 59: data = buf->msg_base + siz;
! 60: memcpy(data, pData, datlen);
! 61: siz += datlen;
! 62: }
! 63:
! 64: /* fixed header */
! 65: MQTTHDR_MSGINIT(hdr);
! 66: hdr->mqtt_msg.type = MQTT_TYPE_PUBLISH;
! 67: hdr->mqtt_msg.qos = QOS;
! 68: hdr->mqtt_msg.dup = Dup ? 1 : 0;
! 69: hdr->mqtt_msg.retain = Retain ? 1 : 0;
! 70: *hdr->mqtt_len = mqtt_encodeLen(siz - sizeof(struct mqtthdr));
! 71:
! 72: mqtt_msgRealloc(buf, siz);
! 73: return siz;
! 74: }
! 75:
! 76: static int
! 77: _mqtt_msgPUB_(mqtt_msg_t * __restrict buf, u_char cmd, u_short msgID)
! 78: {
! 79: int siz = 0;
! 80: struct mqtthdr *hdr;
! 81: mqtt_v_t *v;
! 82:
! 83: if (!buf)
! 84: return -1;
! 85:
! 86: if (mqtt_msgRealloc(buf, sizeof(struct mqtthdr) + sizeof(mqtt_v_t)) == -1)
! 87: return -1;
! 88: else {
! 89: hdr = (struct mqtthdr *) (buf->msg_base + siz);
! 90: siz += sizeof(struct mqtthdr);
! 91: v = (mqtt_v_t*) (buf->msg_base + siz);
! 92: siz += sizeof(mqtt_v_t);
! 93: }
! 94:
! 95: /* fixed header */
! 96: MQTTHDR_MSGINIT(hdr);
! 97: hdr->mqtt_msg.type = cmd;
! 98: *hdr->mqtt_len = sizeof(mqtt_v_t);
! 99:
! 100: /* MessageID */
! 101: v->val = htons(msgID);
! 102:
! 103: return siz;
! 104: }
! 105:
! 106: /*
! 107: * mqtt_msgPUBACK() Create PUBACK message
! 108: *
! 109: * @buf = Message buffer
! 110: * @msgID = MessageID
! 111: * return: -1 error or >-1 message size for send
! 112: */
! 113: inline int
! 114: mqtt_msgPUBACK(mqtt_msg_t * __restrict buf, u_short msgID)
! 115: {
! 116: return _mqtt_msgPUB_(buf, MQTT_TYPE_PUBACK, msgID);
! 117: }
! 118:
! 119: /*
! 120: * mqtt_msgPUBREC() Create PUBREC message
! 121: *
! 122: * @buf = Message buffer
! 123: * @msgID = MessageID
! 124: * return: -1 error or >-1 message size for send
! 125: */
! 126: inline int
! 127: mqtt_msgPUBREC(mqtt_msg_t * __restrict buf, u_short msgID)
! 128: {
! 129: return _mqtt_msgPUB_(buf, MQTT_TYPE_PUBREC, msgID);
! 130: }
! 131:
! 132: /*
! 133: * mqtt_msgPUBREL() Create PUBREL message
! 134: *
! 135: * @buf = Message buffer
! 136: * @msgID = MessageID
! 137: * return: -1 error or >-1 message size for send
! 138: */
! 139: inline int
! 140: mqtt_msgPUBREL(mqtt_msg_t * __restrict buf, u_short msgID)
! 141: {
! 142: return _mqtt_msgPUB_(buf, MQTT_TYPE_PUBREL, msgID);
! 143: }
! 144:
! 145: /*
! 146: * mqtt_msgPUBCOMP() Create PUBCOMP message
! 147: *
! 148: * @buf = Message buffer
! 149: * @msgID = MessageID
! 150: * return: -1 error or >-1 message size for send
! 151: */
! 152: inline int
! 153: mqtt_msgPUBCOMP(mqtt_msg_t * __restrict buf, u_short msgID)
! 154: {
! 155: return _mqtt_msgPUB_(buf, MQTT_TYPE_PUBCOMP, msgID);
! 156: }
! 157:
! 158:
! 159: /* ============= decode ============ */
! 160:
! 161: /*
! 162: * mqtt_readPUBLISH() Read PUBLISH message
! 163: *
! 164: * @buf = Message buffer
! 165: * @psTopic = Topic
! 166: * @topicLen = Topic length
! 167: * @msgID = MessageID
! 168: * @pData = Data buffer
! 169: * @datLen = Data buffer length, if *datLen == 0 allocate memory for pData
! 170: * return: NULL error or !=NULL MQTT fixed header
! 171: */
! 172: struct mqtthdr *
! 173: mqtt_readPUBLISH(mqtt_msg_t * __restrict buf, char * __restrict psTopic, int topicLen,
! 174: u_short *msgID, void * __restrict pData, int *datLen)
! 175: {
! 176: int len, ret;
! 177: struct mqtthdr *hdr;
! 178: mqtthdr_var_t *var;
! 179: mqtt_v_t *v;
! 180: caddr_t pos;
! 181:
! 182: if (!buf || !psTopic || !msgID || !pData)
! 183: return NULL;
! 184:
! 185: hdr = _mqtt_readHEADER(buf, MQTT_TYPE_PUBLISH, &ret, &len);
! 186: if (!hdr)
! 187: return NULL;
! 188: pos = buf->msg_base + ret + 1;
! 189: var = (mqtthdr_var_t*) pos;
! 190:
! 191: /* topic */
! 192: len -= MQTTHDR_VAR_SIZEOF(var);
! 193: if (len < 0) {
! 194: mqtt_SetErr(EINVAL, "Error:: short message length %d", len);
! 195: return NULL;
! 196: } else {
! 197: memset(psTopic, 0, topicLen--);
! 198: memcpy(psTopic, var->var_data, ntohs(var->var_sb.val) > topicLen ?
! 199: topicLen : ntohs(var->var_sb.val));
! 200: pos += MQTTHDR_VAR_SIZEOF(var);
! 201: v = (mqtt_v_t*) pos;
! 202: }
! 203:
! 204: len -= sizeof(mqtt_v_t);
! 205: if (len < 0) {
! 206: mqtt_SetErr(EINVAL, "Error:: short message length %d", len);
! 207: return NULL;
! 208: } else {
! 209: *msgID = ntohs(v->val);
! 210: pos += sizeof(mqtt_v_t);
! 211: }
! 212:
! 213: /* data */
! 214: if (len < 0) {
! 215: mqtt_SetErr(EINVAL, "Error:: short message length %d", len);
! 216: return NULL;
! 217: } else {
! 218: if (!*datLen) {
! 219: if (!(pData = malloc(len))) {
! 220: LOGERR;
! 221: return NULL;
! 222: } else
! 223: *datLen = len;
! 224: }
! 225:
! 226: memset(pData, 0, *datLen);
! 227: if (len < *datLen)
! 228: *datLen = len;
! 229: memcpy(pData, pos, *datLen);
! 230: }
! 231:
! 232: return hdr;
! 233: }
! 234:
! 235: /*
! 236: * mqtt_readPUBACK() Read PUBACK message
! 237: *
! 238: * @buf = Message buffer
! 239: * return: -1 error or MessageID
! 240: */
! 241: u_short
! 242: mqtt_readPUBACK(mqtt_msg_t * __restrict buf)
! 243: {
! 244: int len, ret;
! 245: struct mqtthdr *hdr;
! 246: mqtt_v_t *v;
! 247: caddr_t pos;
! 248:
! 249: hdr = _mqtt_readHEADER(buf, MQTT_TYPE_PUBACK, &ret, &len);
! 250: if (!hdr)
! 251: return (u_short) -1;
! 252: if (len < sizeof(mqtt_v_t)) {
! 253: mqtt_SetErr(EINVAL, "Error:: short message length %d", len);
! 254: return (u_short) -1;
! 255: } else {
! 256: pos = buf->msg_base + ret + 1;
! 257: v = (mqtt_v_t*) pos;
! 258: }
! 259:
! 260: return ntohs(v->val);
! 261: }
! 262:
! 263: /*
! 264: * mqtt_readPUBREC() Read PUBREC message
! 265: *
! 266: * @buf = Message buffer
! 267: * return: -1 error or MessageID
! 268: */
! 269: u_short
! 270: mqtt_readPUBREC(mqtt_msg_t * __restrict buf)
! 271: {
! 272: int len, ret;
! 273: struct mqtthdr *hdr;
! 274: mqtt_v_t *v;
! 275: caddr_t pos;
! 276:
! 277: hdr = _mqtt_readHEADER(buf, MQTT_TYPE_PUBREC, &ret, &len);
! 278: if (!hdr)
! 279: return (u_short) -1;
! 280: if (len < sizeof(mqtt_v_t)) {
! 281: mqtt_SetErr(EINVAL, "Error:: short message length %d", len);
! 282: return (u_short) -1;
! 283: } else {
! 284: pos = buf->msg_base + ret + 1;
! 285: v = (mqtt_v_t*) pos;
! 286: }
! 287:
! 288: return ntohs(v->val);
! 289: }
! 290:
! 291: /*
! 292: * mqtt_readPUBREL() Read PUBREL message
! 293: *
! 294: * @buf = Message buffer
! 295: * return: -1 error or MessageID
! 296: */
! 297: u_short
! 298: mqtt_readPUBREL(mqtt_msg_t * __restrict buf)
! 299: {
! 300: int len, ret;
! 301: struct mqtthdr *hdr;
! 302: mqtt_v_t *v;
! 303: caddr_t pos;
! 304:
! 305: hdr = _mqtt_readHEADER(buf, MQTT_TYPE_PUBREL, &ret, &len);
! 306: if (!hdr)
! 307: return (u_short) -1;
! 308: if (len < sizeof(mqtt_v_t)) {
! 309: mqtt_SetErr(EINVAL, "Error:: short message length %d", len);
! 310: return (u_short) -1;
! 311: } else {
! 312: pos = buf->msg_base + ret + 1;
! 313: v = (mqtt_v_t*) pos;
! 314: }
! 315:
! 316: return ntohs(v->val);
! 317: }
! 318:
! 319: /*
! 320: * mqtt_readPUBCOMP() Read PUBCOMP message
! 321: *
! 322: * @buf = Message buffer
! 323: * return: -1 error or MessageID
! 324: */
! 325: u_short
! 326: mqtt_readPUBCOMP(mqtt_msg_t * __restrict buf)
! 327: {
! 328: int len, ret;
! 329: struct mqtthdr *hdr;
! 330: mqtt_v_t *v;
! 331: caddr_t pos;
! 332:
! 333: hdr = _mqtt_readHEADER(buf, MQTT_TYPE_PUBCOMP, &ret, &len);
! 334: if (!hdr)
! 335: return (u_short) -1;
! 336: if (len < sizeof(mqtt_v_t)) {
! 337: mqtt_SetErr(EINVAL, "Error:: short message length %d", len);
! 338: return (u_short) -1;
! 339: } else {
! 340: pos = buf->msg_base + ret + 1;
! 341: v = (mqtt_v_t*) pos;
! 342: }
! 343:
! 344: return ntohs(v->val);
! 345: }
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