/**
* Write all the blocks in a Tag to the Mifare tag.
*
* @param t
* @throws IOException
*/
public void write(Tag t) throws IOException {
if (t.getSectorCount() > mKeys.getSectorCount()) throw new IOException("Too few keys");
mTag.connect();
int sectors = mTag.getSectorCount();
try {
for (int s = 0; s < sectors; ++s) {
// Authenticate for each sector (try B key, then A key)
if (!mTag.authenticateSectorWithKeyB(s, mKeys.getKeyB(s))
&& !mTag.authenticateSectorWithKeyA(s, mKeys.getKeyA(s)))
throw new IOException("Auth error");
// Write to tag. Skip block 0 and the trailer of each sector
int blockOffset = mTag.sectorToBlock(s);
int lastBlock = blockOffset + mTag.getBlockCountInSector(s);
// Skip block 0
blockOffset = blockOffset == 0 ? 1 : blockOffset;
for (int b = blockOffset; b < lastBlock; ++b) {
mTag.writeBlock(b, t.getBlock(b));
if (mProgressListener != null)
mProgressListener.publishProgress((100 * b) / t.getBlockCount());
}
}
} finally {
mTag.close();
}
}
/**
* Read all blocks from the Mifare tag and return the data in a Tag object.
*
* @return A Tag object containing the data of the Mifare tag.
* @throws IOException
*/
public Tag read() throws IOException {
int sectors = mTag.getSectorCount();
Tag t = new Tag(TagType.getType(sectors));
if (t.getSectorCount() > mKeys.getSectorCount()) throw new IOException("Too few keys");
mTag.connect();
try {
for (int s = 0; s < sectors; ++s) {
byte[] aKey = mKeys.getKeyA(s);
byte[] bKey = mKeys.getKeyB(s);
// Authenticate for each sector (try A key, then B key)
if (!mTag.authenticateSectorWithKeyA(s, aKey) && !mTag.authenticateSectorWithKeyB(s, bKey))
throw new IOException("Auth error");
// Read every block of the sector
int blockOffset = mTag.sectorToBlock(s);
int lastBlock = blockOffset + mTag.getBlockCountInSector(s);
for (int b = blockOffset; b < lastBlock; ++b) {
byte[] readBuffer = mTag.readBlock(b);
// Manually transfer key data to tag since it is usually not
// readable
if (b == lastBlock - 1) {
for (int i = 0; i < Tag.KEY_SIZE; ++i) {
readBuffer[i] = aKey[i];
readBuffer[Tag.BLOCK_SIZE - Tag.KEY_SIZE + i] = bKey[i];
}
}
t.setBlock(b, readBuffer);
if (mProgressListener != null)
mProgressListener.publishProgress((100 * b) / t.getBlockCount());
}
}
return t;
} finally {
mTag.close();
}
}
