tag recognition program, rudimentary draft

/* rfid-mod
* simplistic rfid recog program heavily based on Phidgets Inc's RFID-simple
* version: 0.1b
* author: Lepht Anonym */


#include
#include

/* attachHandler
* displays status to the terminal */
int attachHandler(CPhidgetHandle reader, void *userPointer)
{
int serial;
const char *name;

CPhidget_getDeviceName (reader, &name);
CPhidget_getSerialNumber(reader, &serial);
printf("%s %10d attached.\n", name, serial);

return 0;
}

/* detachHandler
* displays status to the terminal */
int detachHandler(CPhidgetHandle reader, void *userPointer)
{
int serial;
const char *name;

CPhidget_getDeviceName (reader, &name);
CPhidget_getSerialNumber(reader, &serial);
printf("%s %10d detached.\n", name, serial);

return 0;
}

/* errorHandler
* prints errors to the terminal */
int errorHandler(CPhidgetHandle reader, void *userPointer, int errorCode, const char *unknown)
{
printf("error handled: %i - %s\n", errorCode, unknown);
return 0;
}

/* tagHandler
* turns on the LED port and prints the ID of the tag
* later, it will store the read tag in a local var so it can be verified as either matching L's or not
* pls note this is not a secure thing to do as the tag value could be strings'd out of the program (should hash'n'md5 instead) */
int tagHandler(CPhidgetRFIDHandle reader, void *userPointer, unsigned char *tag)
{
int i;
CPhidgetRFID_setLEDOn(reader, 1);
printf("got tag: ");
for(i = 0 ; i < 5 ; i++) printf("%02x ", (*(tag+i))&0xff);
printf("\n");
return 0;
}

/* tagLostHandler
* turns off the LED port and prints the ID of the lost tag to the terminal */
int tagLostHandler(CPhidgetRFIDHandle reader, void *userPointer, unsigned char *tag)
{
int i;
int var[5];
CPhidgetRFID_setLEDOn(reader, 0);
printf("tag lost: ", tag);
for(i = 0 ; i < 5 ; i++) printf("%02x ", (*(tag+i))&0xff);
// store that same data as a variable:
for(i = 0; i < 5; i++) { var[i] = (*(tag+i)&0xff); }
// TODO check that the separate parts of the var array match L's implant
printf("\n");
return 0;
}

/* displayProperties
* displays the data about a physical reader to the terminal */
void displayProperties(CPhidgetRFIDHandle reader)
{
// declare variables for the data and a buffer to store device type in:
int serial, version, outputs, antennaStatus;
const char* type;

// get data from the device:
CPhidget_getDeviceType((CPhidgetHandle)reader, &type);
CPhidget_getSerialNumber((CPhidgetHandle)reader, &serial);
CPhidget_getDeviceVersion((CPhidgetHandle)reader, &version);
CPhidgetRFID_getNumOutputs(reader, &outputs);
CPhidgetRFID_getAntennaOn(reader, &antennaStatus);

// print to the terminal:
printf("%s\n", type);
printf("serial number: %10d\nversion: %8d\n", serial, version);
printf("number of digital outputs: %d\n\n", outputs);
printf("antenna status: %d\n", antennaStatus);
}

/* main
* administrates */
int main(int argc, char* argv[])
{
const char *error;
int result;

// declare and create a handle for the reader:
CPhidgetRFIDHandle reader = 0;
CPhidgetRFID_create(&reader);

// set handlers for device and tag events:
CPhidget_set_OnAttach_Handler((CPhidgetHandle)reader, attachHandler, NULL);
CPhidget_set_OnDetach_Handler((CPhidgetHandle)reader, detachHandler, NULL);
CPhidget_set_OnError_Handler((CPhidgetHandle)reader, errorHandler, NULL);
CPhidgetRFID_set_OnTag_Handler(reader, tagHandler, NULL);
CPhidgetRFID_set_OnTagLost_Handler(reader, tagLostHandler, NULL);

// open device:
CPhidget_open((CPhidgetHandle)reader, -1);

// wait for the physical RFID reader device to be attached:
printf("polling for physical device presence...");
if((result = CPhidget_waitForAttachment((CPhidgetHandle)reader, 10000)))
{
CPhidget_getErrorDescription(result, &error);
printf("device error: %s\n", error);
return 1;
}

// activate the antenna and display properties to the terminal:
CPhidgetRFID_setAntennaOn(reader, 1);
displayProperties(reader);

// keep the program open until the user is done:
printf("now scanning for tags.\nhit any key and enter to end session.\n");
getchar();

// close the device and free the memory back up:
printf("closing...\n");
CPhidget_close((CPhidgetHandle)reader);
CPhidget_delete((CPhidgetHandle)reader);
return 0;
}