/// <summary>
/// Process READ BINARY instruction (CC2)
/// <para>
/// C-APDU: <code>00 B0 {P1-P2: offset} {Le}</code>
/// </para>
/// <para>
/// R-APDU when an EF is selected: <code>{data in EF}</code>
/// </para>
/// <para>
/// R-APDU when no EF is selected: <code>{headers of EF in current DF}</code>
/// </para>
/// </summary>
/// <param name="apdu"></param>
/// <returns></returns>
private IFakeCardFeedback ProcessRead(CommandAPDU apdu)
{
short le = apdu.SetOutgoing(); // in BYTES
short wordCount = (short)((short)(le + 3) / 4);
byte[] buffer = JCSystem.makeTransientByteArray((short)(wordCount * 4), JCSystem.CLEAR_ON_DESELECT);
short offset;
if (_currentEF != null)
{
// an EF is selected ==> read binary
offset = Util.getShort(apdu.GetBuffer(), JavaCard.ISO7816.OFFSET_P1); // in WORDS
byte[] header = JCSystem.makeTransientByteArray(8, JCSystem.CLEAR_ON_DESELECT);
_currentEF.GetHeader(header, 0);
_headerParser.Parse(header, 0, 8);
offset += (short)(_currentEF.Read(offset, buffer, 0, wordCount, _headerParser.fileType == HeaderParser.FILETYPE_EFSZ) << 2);
}
else
{
// no EF selected ==> DIR
offset = 0;
byte currentChildNumber = 0;
File fileChild = _currentDF.GetChild(currentChildNumber);
// get header of each file in current DF
while (fileChild != null && offset < le)
{
fileChild.GetHeader(buffer, offset);
offset += (short)(fileChild.GetHeaderSize() << 2);
fileChild = _currentDF.GetChild(++currentChildNumber);
}
}
// Pad with FF
Util.arrayFillNonAtomic(buffer, offset, (short)(le - offset), (byte)MemoryState.Free);
// and send data!
apdu.SetOutgoingLength(le);
return(apdu.SendBytesLong(buffer, 0, le));
}
/// <summary>
/// Process WRITE BINARY instruction (CC3)
/// <para>
/// C-APDU: <code>00 B0 {offset} {Lc} {data} </code>
/// </para>
/// <list type="table">
/// <item>
/// <term>offset</term>
/// <description>offset of first word of the file coded by P1 P2 (WORDS) to be written.</description>
/// </item>
/// <item>
/// <term>data</term>
/// <description>data to be written in file.</description>
/// </item>
/// </list>
/// </summary>
/// <param name="apdu"></param>
/// <returns></returns>
private IFakeCardFeedback ProcessWrite(CommandAPDU apdu)
{
// TODO: check ==> security of current EF
byte[] apduBuffer = apdu.GetBuffer();
apdu.SetIncomingAndReceive();
short offset = Util.getShort(apduBuffer, JavaCard.ISO7816.OFFSET_P1); // in WORDS
short length = APDUHelpers.getIncomingLength(apdu); // in BYTES
short wordCount = (short)((short)(length + 3) / 4); // length in WORDS
// availability check
VerifyOutOfFile(offset, wordCount);
if (!_currentEF.IsAvailable(offset, wordCount))
{
ISOException.throwIt(JavaCard.ISO7816.SW_WRONG_LENGTH);
}
// copy data in a buffer
byte[] buffer = JCSystem.makeTransientByteArray((short)(wordCount * 4), JCSystem.CLEAR_ON_DESELECT);
short udcOffset = APDUHelpers.getOffsetCdata(apdu);
Util.arrayCopyNonAtomic(apduBuffer, udcOffset, buffer, 0, length);
// complete words with FF in buffer
short iMax = (short)(wordCount * 4);
for (short i = length; i < iMax; i++)
{
buffer[i] = 0xFF;
}
// and write data to file
_currentEF.Write(buffer, 0, offset, wordCount);
return(FakeCardFeedback.FromSuccess(unchecked ((short)0x9000)));
}