/**
* Reads data from the current selected file (INS 0xB0)
*
* @param offset Offset at which to start reading
* @param nbBytes Number of bytes to read
* @return Data retreived from the file
*/
public byte[] readBinary(int offset, int nbBytes) throws SecureElementException {
if (mFileSize == 0) return null;
if (nbBytes == -1) nbBytes = mFileSize;
if (mFileType != EF) throw new SecureElementException("Incorrect file type");
if (mFileStructure != TRANSPARENT) throw new SecureElementException("Incorrect file structure");
int length, pos = 0;
byte[] result = new byte[nbBytes];
byte[] cmd = {0x00, (byte) 0xB0, 0x00, 0x00, 0x00};
while (nbBytes != 0) {
if (nbBytes < BUFFER_LEN) length = nbBytes;
else length = BUFFER_LEN; // Set to max buffer size
Log.d(TAG, "ReadBinary [" + offset + ".." + length + "b]");
cmd[2] = (byte) (offset >> 8);
cmd[3] = (byte) offset;
cmd[4] = (byte) length;
System.arraycopy(mSEHandle.exchangeAPDU(this, cmd), 0, result, pos, length);
nbBytes -= length;
offset += length;
pos += length;
}
return result;
}
/**
* Selects a file (INS 0xA4)
*
* @param path Path of the file
* @return Command status code [sw1 sw2]
*/
public int selectFile(byte[] path) throws SecureElementException {
if ((path == null) || (path.length == 0) || ((path.length % 2) != 0))
throw new SecureElementException("Incorrect path");
int index;
int length = path.length;
if ((mSEHandle.getSeInterface() == SecureElement.SIM_IO) && (length > 2)) {
index = length - 2; // Only FileID is usefull
mFilePath = Util.bytesToString(path, 0, index, "");
} else {
index = 0;
mFilePath = "";
}
byte[] data = null;
byte[] cmd = new byte[] {0x00, (byte) 0xA4, 0x00, 0x04, 0x02, 0x00, 0x00};
mFileType = UNKNOWN;
mFileStructure = UNKNOWN;
mFileSize = 0;
mFileRecordSize = 0;
mFileNbRecords = 0;
// iterate through path
for (int sw1; index < length; index += 2) {
mFileID = ((path[index] & 0xFF) << 8) | (path[index + 1] & 0xFF);
cmd[5] = (byte) (mFileID >> 8);
cmd[6] = (byte) mFileID;
data = mSEHandle.exchangeAPDU(this, cmd);
// Check ADPU status
sw1 = data[data.length - 2] & 0xFF;
if ((sw1 != 0x62) && (sw1 != 0x63) && (sw1 != 0x90) && (sw1 != 0x91)) {
return (sw1 << 8) | (data[data.length - 1] & 0xFF);
}
}
// Analyse file properties
decodeFileProperties(data);
if (mFileNbRecords == 0) Log.d(TAG, "SelectFile [" + mFileSize + "b]");
else Log.d(TAG, "SelectFile [" + mFileNbRecords + "*" + mFileRecordSize + "b]");
return APDU_SUCCESS;
}
/**
* Reads a record from the current selected file (INS 0xB2)
*
* @param record Record ID [0..n]
* @return Data from requested record
*/
public byte[] readRecord(short record) throws SecureElementException {
// Check the type of current selected file
if (mFileType != EF) throw new SecureElementException("Incorrect file type");
if (mFileStructure != LINEAR_FIXED)
throw new SecureElementException("Incorrect file structure");
// Check if requested record is valid
if ((record < 0) || (record > mFileNbRecords))
throw new SecureElementException("Incorrect record number");
Log.d(TAG, "ReadRecord [" + record + "/" + mFileRecordSize + "b]");
byte[] cmd = {0x00, (byte) 0xB2, (byte) record, 0x04, (byte) mFileRecordSize};
return Arrays.copyOf(mSEHandle.exchangeAPDU(this, cmd), mFileRecordSize);
}