/**
* Decode file charset.
*
* @param f File to process.
* @return File charset.
* @throws IOException in case of error.
*/
public static Charset decode(File f) throws IOException {
SortedMap<String, Charset> charsets = Charset.availableCharsets();
String[] firstCharsets = {
Charset.defaultCharset().name(), "US-ASCII", "UTF-8", "UTF-16BE", "UTF-16LE"
};
Collection<Charset> orderedCharsets = U.newLinkedHashSet(charsets.size());
for (String c : firstCharsets)
if (charsets.containsKey(c)) orderedCharsets.add(charsets.get(c));
orderedCharsets.addAll(charsets.values());
try (RandomAccessFile raf = new RandomAccessFile(f, "r")) {
FileChannel ch = raf.getChannel();
ByteBuffer buf = ByteBuffer.allocate(4096);
ch.read(buf);
buf.flip();
for (Charset charset : orderedCharsets) {
CharsetDecoder decoder = charset.newDecoder();
decoder.reset();
try {
decoder.decode(buf);
return charset;
} catch (CharacterCodingException ignored) {
}
}
}
return Charset.defaultCharset();
}
/** {@inheritDoc} */
@Override
public ByteBuffer encode(GridNioSession ses, GridClientMessage msg)
throws IOException, GridException {
assert msg != null;
if (msg instanceof GridTcpRestPacket) return encodeMemcache((GridTcpRestPacket) msg);
else if (msg == PING_MESSAGE) return ByteBuffer.wrap(PING_PACKET);
else {
byte[] data = marshaller.marshal(msg);
assert data.length > 0;
ByteBuffer res = ByteBuffer.allocate(data.length + 5);
res.put(GRIDGAIN_REQ_FLAG);
res.put(U.intToBytes(data.length));
res.put(data);
res.flip();
return res;
}
}