Hi,
I am trying to find the size needs during
instantiation to manage allocation.
I took this sample from javacard toolkit. Can you
please tell me how to calculate the size needed during
instantiation to manage allocation in
the below sample.
========================================================================================================================================================
public class Wallet extends javacard.framework.Applet
{
/* constants declaration */
// code of CLA byte in the command APDU header
final static byte Wallet_CLA =(byte)0x80;
// codes of INS byte in the command APDU header
final static byte Deposit = (byte) 0x10;
final static byte Debit = (byte) 0x20;
final static byte Balance = (byte) 0x30;
final static byte Validate = (byte) 0x40;
final static byte Encrypt = (byte) 0x50;
final static byte PinChange = (byte) 0x60;
// maximum number of incorrect tries before the PIN
is blocked
final static byte PinTryLimit =(byte)0x03;
// maximum size PIN
final static byte MaxPinSize =(byte)0x04;
// status word (SW1-SW2) to signal that the balance
becomes negative;
final static short SW_NEGATIVE_BALANCE = (short)
0x6910;
final static short SW_WRONG_PIN = (short) 0x6300;
/* instance variables declaration */
OwnerPIN pin;
static byte base_balance = (byte) 0x20;
byte balance;
DESKey key;
Signature signature;
private Wallet(byte buffer[],short offset,byte
length) {
// It is good programming practice to allocate
// all the memory that an applet needs during its
// lifetime inside the constructor
pin = new OwnerPIN(PinTryLimit, MaxPinSize);
balance = (byte) 0;
key =
(DESKey)KeyBuilder.buildKey(KeyBuilder.TYPE_DES_TRANSIENT_RESET,KeyBuilder.LENGTH_DES,false);
signature =
Signature.getInstance(Signature.ALG_DES_MAC8_ISO9797_M1,false);
signature.init(key,Signature.MODE_SIGN);
if (buffer[offset] == (byte)0) {
register();
}
else {
register(buffer, (short)(offset+1)
,(byte)(buffer[offset]));
}
} // end of the constructor
============================================================================
Regards,
Kamal.
--- sferey <[EMAIL PROTECTED]> wrote:
> kamal kumar a écrit :
> > HI all,
> > I don't know whether it is right forum to ask.
> you can try here or at alt.technology.smartcards
> newgroup.
> > I am new to java card applet development. I have
> > written one sample applet. and loaded the applet
> using
> > sclumberger toolkit. But while installing the
> applet I
> > am facing problem. I need to tell the applet size
> > required for install. I don't know how to find the
> > required size required for the installation.
>
> option 1: bad card domain, change card domain (or
> card).
>
> the CAP file's size should be used if:
> - "installing" means "loading the CAP file" and
> - "applet size" means "size need to store that
> library".
> (if so, the card is quite stupid, since this
> information
> is usually in the first 256 bytes of the CAP file)
>
>
> option 2: card domain with memory allocation
> controls
>
> OOH, if
> - "installing" means "instantiating the applet" or
> - "applet size" means "size needs during
> instantiation
> to manage allocation in its constructor", the
> response
> is up to you and only defined by what you have
> insert
> in your applet constructor.
> (of course if instance, array, ..., instantiation
> is
> also required during the applet's life you want
> take
> such figures into account when computing that
> "needed
> size").
>
> and such information makes sense for a card domain.
>
> Sylvain.
>
>
>
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>
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