/** Wraps access to the specified camera. */
public Kodak(Device dev) throws IOException {
try {
// can we use usbdevfs?
socket = new USBSocket(dev);
in = socket.getInputStream();
out = socket.getOutputStream();
} catch (IOException e) {
if ("Linux".equals(System.getProperty("os.name"))) {
// assume this is the LOCAL implementation
// semantics are like a half duplex packet stream socket
// assume just one camera (kernel handles up to 16)
// single open, per the driver's exclusion policy
random = new RandomAccessFile("/dev/usb/dc2xx0", "rw");
in = new InputHack(random);
out = new OutputHack(random);
} else {
throw e;
}
// NOTE: GCJ 2.96 bug on this path ... putting this
// call here evidently prevented the constructor from
// returning a null object. Strange.
System.err.print("");
}
getCameraStatus();
getCameraType(); // ensures it's a supported camera type
}
/**
* Updates the local copy of the camera status table, and returns a copy of it. The format of this
* data is in section 3.1 of the DC-280 specification; that is a superset of previous models
* including the dc240. Note that this table snapshots the camera's notion of the current time.
*/
public byte[] getCameraStatus() throws IOException {
// this is how NOT to do it!
// no error handling, no framework for other calls.
byte temp[] = new byte[8];
byte response[] = new byte[258];
int len;
temp[0] = 0x7F; // send camera status table
temp[7] = 0x1A;
// write command, receive ack
out.write(temp, 0, temp.length);
len = in.read(temp, 0, 1);
if (len != 1 || temp[0] != KODAK_ACK) throw new IOException("needed ACK");
// get, check, and ack response (ignoring packet checksum!)
len = in.read(response);
if (len != 258 || temp[0] != KODAK_ACK) throw new IOException("needed status packet");
response[0] = KODAK_CORRECT;
out.write(response, 0, 1);
// copy and save the table
temp = new byte[256];
System.arraycopy(response, 1, temp, 0, 256);
statusTable = temp;
// also copy a return value
temp = new byte[256];
System.arraycopy(response, 1, temp, 0, 256);
// get and check ACK
len = in.read(temp, 0, 1);
if (len != 1 || temp[0] != KODAK_COMPLETED) throw new IOException("needed ACK2");
return temp;
}
public static void main(String argv[]) {
Bus busses[] = null;
Host host;
try {
// FIXME: option flag for rmi (iiop?) host:port spec.
host = HostFactory.getHost();
if (host == null) {
System.err.println("USB is unavailable, can't run.");
return;
}
System.out.println("<!-- " + host + " -->");
busses = host.getBusses();
indentLine(0, "<host busses='" + busses.length + "'>");
for (int busno = 0; busno < busses.length; busno++) {
indentLine(2, "<!-- Bus #" + (busno + 1) + " -->");
// show tree from root hub
if (busses[busno] != null) {
try {
printDevice(2, busses[busno].getRootHub());
} catch (IOException e) {
e.printStackTrace();
}
}
}
indentLine(0, "</host>");
} catch (SecurityException e) {
System.err.println("USB permissions problem:");
System.err.println(e.getMessage());
System.exit(1);
} catch (Exception e) {
e.printStackTrace();
}
}