static boolean check(CharsetDecoder dec, byte[] bytes, boolean direct, int[] flow) {
int inPos = flow[0];
int inLen = flow[1];
int outPos = flow[2];
int outLen = flow[3];
int expedInPos = flow[4];
int expedOutPos = flow[5];
CoderResult expedCR = (flow[6] == 0) ? CoderResult.UNDERFLOW : CoderResult.OVERFLOW;
ByteBuffer bbf;
CharBuffer cbf;
if (direct) {
bbf = ByteBuffer.allocateDirect(inPos + bytes.length);
cbf = ByteBuffer.allocateDirect((outPos + outLen) * 2).asCharBuffer();
} else {
bbf = ByteBuffer.allocate(inPos + bytes.length);
cbf = CharBuffer.allocate(outPos + outLen);
}
bbf.position(inPos);
bbf.put(bytes).flip().position(inPos).limit(inPos + inLen);
cbf.position(outPos);
dec.reset();
CoderResult cr = dec.decode(bbf, cbf, false);
if (cr != expedCR || bbf.position() != expedInPos || cbf.position() != expedOutPos) {
System.out.printf("Expected(direct=%5b): [", direct);
for (int i : flow) System.out.print(" " + i);
System.out.println(
"] CR=" + cr + ", inPos=" + bbf.position() + ", outPos=" + cbf.position());
return false;
}
return true;
}
static char[] decode(byte[] bb, Charset cs, boolean testDirect, Time t) throws Exception {
String csn = cs.name();
CharsetDecoder dec = cs.newDecoder();
ByteBuffer bbf;
CharBuffer cbf;
if (testDirect) {
bbf = ByteBuffer.allocateDirect(bb.length);
cbf = ByteBuffer.allocateDirect(bb.length * 2).asCharBuffer();
bbf.put(bb);
} else {
bbf = ByteBuffer.wrap(bb);
cbf = CharBuffer.allocate(bb.length);
}
CoderResult cr = null;
long t1 = System.nanoTime() / 1000;
for (int i = 0; i < iteration; i++) {
bbf.rewind();
cbf.clear();
dec.reset();
cr = dec.decode(bbf, cbf, true);
}
long t2 = System.nanoTime() / 1000;
t.t = (t2 - t1) / iteration;
if (cr != CoderResult.UNDERFLOW) {
System.out.println("DEC-----------------");
int pos = bbf.position();
System.out.printf(
" cr=%s, bbf.pos=%d, bb[pos]=%x,%x,%x,%x%n",
cr.toString(),
pos,
bb[pos++] & 0xff,
bb[pos++] & 0xff,
bb[pos++] & 0xff,
bb[pos++] & 0xff);
throw new RuntimeException("Decoding err: " + csn);
}
char[] cc = new char[cbf.position()];
cbf.flip();
cbf.get(cc);
return cc;
}
static CoderResult decodeCR(byte[] bb, Charset cs, boolean testDirect) throws Exception {
CharsetDecoder dec = cs.newDecoder();
ByteBuffer bbf;
CharBuffer cbf;
if (testDirect) {
bbf = ByteBuffer.allocateDirect(bb.length);
cbf = ByteBuffer.allocateDirect(bb.length * 2).asCharBuffer();
bbf.put(bb).flip();
} else {
bbf = ByteBuffer.wrap(bb);
cbf = CharBuffer.allocate(bb.length);
}
CoderResult cr = null;
for (int i = 0; i < iteration; i++) {
bbf.rewind();
cbf.clear();
dec.reset();
cr = dec.decode(bbf, cbf, true);
}
return cr;
}
/**
* 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();
}
