Diff: JroIpdata.cpp

Revision:

2:3d8d52e9751c

Child:

4:de495ce256b8

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/JroIpdata.cpp	Thu Feb 05 19:01:42 2015 +0000
@@ -0,0 +1,232 @@
+#include "JroIpdata.h"
+
+void printCadena(char* cad, int lenc){
+    
+    //printf("\r\n");
+    for (int i=0; i<lenc; i++){
+        
+        //printf("cad[%d] = %d\r\n", i, cad[i]);
+        }
+    
+    }
+
+IpData::IpData(char* tx_buffer){
+    
+    this->id = ID_DEV;
+    this->isValidData = false;
+    
+    this->len_tx_data = 0;
+    this->tx_buff = tx_buffer;
+    
+    }
+    
+char* IpData::__findHeader(char* buffer){
+    /*
+    Find header and get ip data (without header)
+    
+    Input:
+    
+    Return:
+        valid_ipdata:   ip data without header
+        
+        Example:
+        
+        buffer = [ B0 B1 $ J R O $ B7 B8 B9 B10 ..... ]
+        
+        return
+            valid_ip_data = [ B7 B8 B9 B10 ..... ]
+        
+    
+    */
+    char* valid_ip_data;
+    
+    //printf("\r\nSearching header in %s\r\n", buffer);
+    
+    //Finding header
+    valid_ip_data = strstr(buffer, HEADER);
+    
+    if (valid_ip_data == NULL){
+        //printf("\r\nHeader was not found\r\n");   
+        return NULL;
+    }
+    
+    //printf("\r\nHeader was found %s\r\n", valid_ip_data);
+    
+    //printf("\r\nskipping header ...\r\n");
+    
+    valid_ip_data += 5;  //skip header
+        
+    return valid_ip_data;
+    }
+
+char IpData::__getXor(char* data, unsigned long len_data){
+    
+    char new_xor = 0;
+    
+    for(unsigned long i = 0; i < len_data; i++){
+        new_xor = new_xor xor data[i];
+        }
+    
+    return new_xor;
+    }
+    
+int IpData::__verifyData(char* ip_data, unsigned long len_data){
+    
+    char new_xor = 0;
+    
+    new_xor = this->__getXor(ip_data, len_data);
+    
+    if (new_xor != 0){
+        //printf("\r\nInvalid XOR: %d\r\n", new_xor);
+        return 0;
+    }
+        
+    //printf("\r\nXOR verified successfully\r\n");
+    return 1;
+    }
+
+int IpData::__getParameters(){
+    return 1;
+    }
+    
+char* IpData::encode(unsigned short cmd, char* payload, unsigned long len_payload){
+
+    int head_size= strlen(HEADER);
+    char xor_wr;
+    
+    //Copy header
+    strcpy(tx_buff, HEADER);
+    len_tx_data = len_payload + 5;     //Incluye la longitud de la data + 1B (id_class) + 1B (id_dev) + 2B (cmd) + 1B (xor)
+    len_tx_buffer = len_tx_data + 9;     //Incluye 5 bytes del Header + 4 de la longitud
+    
+    tx_buff[0+head_size] = (len_tx_data >> 24) & 0xff;
+    tx_buff[1+head_size] = (len_tx_data >> 16) & 0xff;
+    tx_buff[2+head_size] = (len_tx_data >> 8) & 0xff; 
+    tx_buff[3+head_size] = len_tx_data & 0xff; 
+    
+    tx_buff[4+head_size] = ID_CLASS;
+    tx_buff[5+head_size] = ID_DEV;
+    
+    tx_buff[6+head_size] = (cmd >> 8) & 0xff; 
+    tx_buff[7+head_size] = cmd & 0xff; 
+    
+    for (unsigned int i=0; i<len_payload; i++){
+        tx_buff[8+head_size+i] = payload[i];
+        }
+    
+    xor_wr = this->__getXor(&tx_buff[0+head_size], len_tx_data+4-1);   //Incluir todos los bytes de datos mas los 4B de la longitud menos 1B del xor
+    
+    tx_buff[8+head_size+len_payload] = xor_wr;
+
+    //printf("\r\nTx Buffer = ");
+    for(unsigned long i=0; i< len_tx_buffer; i++){
+        //printf("0x%x ", tx_buff[i]);
+        }
+        
+    return tx_buff;
+    
+    }
+    
+    
+int IpData::decode(char* buffer, unsigned long len_buffer){
+    
+    char* ip_data;
+    unsigned long len_data;
+    
+    this->isValidData = false;
+    
+    //printf("\r\nRx Buffer = ");
+    for(unsigned long i=0; i< len_buffer; i++){
+        //printf("0x%x ", buffer[i]);
+        }
+    
+    if (len_buffer < 13){
+        //printf("\r\nLongitud de la data insuficiente\r\n");
+        return 0;
+        }
+        
+    //Finding header and get ip data (without header)
+    ip_data = this->__findHeader(buffer);
+    
+    if (ip_data == NULL)
+        return 0;
+    
+    len_data = ip_data[0]*65536*256 + ip_data[1]*65536 + ip_data[2]*256 + ip_data[3];
+    
+    //printf("\r\nLen data = %d\r\n", len_data);
+    
+    this->rx_buff = ip_data;
+    
+    //len_data + 4 = longitud de toda la data (incluyendo los 4 bytes del campo len)
+    if (not this->__verifyData(ip_data, len_data+4))
+        return 0;
+        
+    //head = ip_data[0:5];
+    this->id_class = ip_data[4];
+    this->id_dev = ip_data[5];
+    this->cmd = ip_data[6]*256 + ip_data[7];
+    this->payload = ip_data + 8;
+    this->len_payload = len_data - 5;       //1B id_class, 1B id_dev, 2B cmd y 1B xor
+    this->xor_rd = ip_data[4+len_data-1];
+    
+    //printf("\r\nID_CLASS = 0x%x, ID_DEV = 0x%x, CMD = 0x%x, XOR = 0x%x", id_class, id_dev, cmd, xor_rd);
+    //printf("\r\nPAYLOAD[0] = 0x%x, PYLD_LEN = 0x%x\r\n", payload[0], len_payload);
+    
+    if (this->id_class == ID_CLASS){
+        this->isValidData = true;
+    
+        return 1;
+        }
+    
+    return 0;
+    
+    }
+    
+char IpData::getIdClass(){
+    
+    if (not this->isValidData)
+        return 0;
+        
+    return this->id_class;
+    }
+    
+char IpData::getIdDevice(){
+    
+    if (not this->isValidData)
+        return 0;
+        
+    return this->id_dev;
+    }
+    
+unsigned short IpData::getCmd(){
+    
+    if (not this->isValidData)
+        return 0;
+        
+    return this->cmd;
+    }
+    
+unsigned long IpData::getPayloadLen(){
+    
+    if (not this->isValidData)
+        return 0;
+        
+    return this->len_payload;
+    }
+    
+char* IpData::getPayload(){
+    
+    if (not this->isValidData)
+        return NULL;
+        
+    return this->payload;
+    }
+ 
+char* IpData::getTxData(){
+        
+    return this->tx_buff;
+    }   
+unsigned long IpData::getTxDataLen(){
+        
+    return this->len_tx_buffer;
+    }
\ No newline at end of file