public void write(Tag tag, RandomAccessFile raf, RandomAccessFile tempRaf)
throws CannotWriteException, IOException {
FileChannel fc = raf.getChannel();
int oldTagSize = 0;
if (tagExists(fc)) {
// read the length
if (!canOverwrite(raf))
throw new CannotWriteException("Overwritting of this kind of ID3v2 tag not supported yet");
fc.position(6);
ByteBuffer buf = ByteBuffer.allocate(4);
fc.read(buf);
oldTagSize = (buf.get(0) & 0xFF) << 21;
oldTagSize += (buf.get(1) & 0xFF) << 14;
oldTagSize += (buf.get(2) & 0xFF) << 7;
oldTagSize += buf.get(3) & 0xFF;
oldTagSize += 10;
// System.err.println("Old tag size: "+oldTagSize);
int newTagSize = tc.getTagLength(tag);
if (oldTagSize >= newTagSize) {
// replace
// System.err.println("Old ID32v Tag found, replacing the old
// tag");
fc.position(0);
fc.write(tc.convert(tag, oldTagSize - newTagSize));
// ID3v2 Tag Written
return;
}
}
// create new tag with padding
// System.err.println("Creating a new ID3v2 Tag");
fc.position(oldTagSize);
if (fc.size() > 15 * 1024 * 1024) {
FileChannel tempFC = tempRaf.getChannel();
tempFC.position(0);
tempFC.write(tc.convert(tag, Id3v2TagCreator.DEFAULT_PADDING));
tempFC.transferFrom(fc, tempFC.position(), fc.size() - oldTagSize);
fc.close();
} else {
ByteBuffer[] content = new ByteBuffer[2];
content[1] = ByteBuffer.allocate((int) fc.size());
fc.read(content[1]);
content[1].rewind();
content[0] = tc.convert(tag, Id3v2TagCreator.DEFAULT_PADDING);
fc.position(0);
fc.write(content);
}
}
public static void main(String args[]) {
try {
aServer asr = new aServer();
// file channel.
FileInputStream is = new FileInputStream("");
is.read();
FileChannel cha = is.getChannel();
ByteBuffer bf = ByteBuffer.allocate(1024);
bf.flip();
cha.read(bf);
// Path Paths
Path pth = Paths.get("", "");
// Files some static operation.
Files.newByteChannel(pth);
Files.copy(pth, pth);
// file attribute, other different class for dos and posix system.
BasicFileAttributes bas = Files.readAttributes(pth, BasicFileAttributes.class);
bas.size();
} catch (Exception e) {
System.err.println(e);
}
System.out.println("hello ");
}
public static void main(String[] arguments) {
try {
// read byte data into a byte buffer
String data = "friends.dat";
FileInputStream inData = new FileInputStream(data);
FileChannel inChannel = inData.getChannel();
long inSize = inChannel.size();
ByteBuffer source = ByteBuffer.allocate((int) inSize);
inChannel.read(source, 0);
source.position(0);
System.out.println("Original byte data:");
for (int i = 0; source.remaining() > 0; i++) {
System.out.print(source.get() + " ");
}
// convert byte data into character data
source.position(0);
Charset ascii = Charset.forName("US-ASCII");
CharsetDecoder toAscii = ascii.newDecoder();
CharBuffer destination = toAscii.decode(source);
destination.position(0);
System.out.println("\n\nNew character data:");
for (int i = 0; destination.remaining() > 0; i++) {
System.out.print(destination.get());
}
System.out.println();
} catch (FileNotFoundException fne) {
System.out.println(fne.getMessage());
} catch (IOException ioe) {
System.out.println(ioe.getMessage());
}
}
private boolean tagExists(FileChannel fc) throws IOException {
ByteBuffer b = ByteBuffer.allocate(3);
fc.position(0);
fc.read(b);
String tagString = new String(b.array());
return tagString.equals("ID3");
}
public RandomAccessFile delete(RandomAccessFile raf, RandomAccessFile tempRaf)
throws IOException {
FileChannel fc = raf.getChannel();
fc.position(0);
if (!tagExists(fc)) return raf;
fc.position(6);
ByteBuffer b = ByteBuffer.allocate(4);
fc.read(b);
b.rewind();
int tagSize = (b.get() & 0xFF) << 21;
tagSize += (b.get() & 0xFF) << 14;
tagSize += (b.get() & 0xFF) << 7;
tagSize += b.get() & 0xFF;
FileChannel tempFC = tempRaf.getChannel();
tempFC.position(0);
fc.position(tagSize + 10);
// Here we will try to skip eventual trash afer the tag and before the
// audio data
b = ByteBuffer.allocate(4);
int skip = 0;
while (fc.read(b) != -1) {
if ((b.get(0) & 0xFF) == 0xFF
&& (b.get(1) & 0xE0) == 0xE0
&& (b.get(1) & 0x06) != 0
&& (b.get(2) & 0xF0) != 0xF0
&& (b.get(2) & 0x08) != 0x08) {
fc.position(fc.position() - 4);
break;
}
fc.position(fc.position() - 3);
b.rewind();
skip++;
}
tempFC.transferFrom(fc, 0, fc.size() - tagSize - 10 - skip);
return tempRaf;
}
public static void runTests() {
try {
// SHA1 sha1Jmule = new SHA1();
MessageDigest sha1Sun = MessageDigest.getInstance("SHA-1");
SHA1 sha1Gudy = new SHA1();
// SHA1Az shaGudyResume = new SHA1Az();
ByteBuffer buffer = ByteBuffer.allocate(1024 * 1024);
File dir = new File(dirname);
File[] files = dir.listFiles();
for (int i = 0; i < files.length; i++) {
FileChannel fc = new RandomAccessFile(files[i], "r").getChannel();
System.out.println("Testing " + files[i].getName() + " ...");
while (fc.position() < fc.size()) {
fc.read(buffer);
buffer.flip();
byte[] raw = new byte[buffer.limit()];
System.arraycopy(buffer.array(), 0, raw, 0, raw.length);
sha1Gudy.update(buffer);
sha1Gudy.saveState();
ByteBuffer bb = ByteBuffer.wrap(new byte[56081]);
sha1Gudy.digest(bb);
sha1Gudy.restoreState();
sha1Sun.update(raw);
buffer.clear();
}
byte[] sun = sha1Sun.digest();
sha1Sun.reset();
byte[] gudy = sha1Gudy.digest();
sha1Gudy.reset();
if (Arrays.equals(sun, gudy)) {
System.out.println(" SHA1-Gudy: OK");
} else {
System.out.println(" SHA1-Gudy: FAILED");
}
buffer.clear();
fc.close();
System.out.println();
}
} catch (Throwable e) {
Debug.printStackTrace(e);
}
}
public static void main(String args[]) throws Exception {
FileInputStream fin = new FileInputStream("readandshow.txt");
FileChannel fc = fin.getChannel();
ByteBuffer buffer = ByteBuffer.allocate(1024);
fc.read(buffer);
buffer.flip();
int i = 0;
while (buffer.remaining() > 0) {
byte b = buffer.get();
System.out.println("Character " + i + ": " + ((char) b));
i++;
}
fin.close();
}
public static void main(String[] args) throws Exception {
File blah = File.createTempFile("blah", null);
blah.deleteOnExit();
ByteBuffer[] dstBuffers = new ByteBuffer[10];
for (int i = 0; i < 10; i++) {
dstBuffers[i] = ByteBuffer.allocateDirect(10);
dstBuffers[i].position(10);
}
FileInputStream fis = new FileInputStream(blah);
FileChannel fc = fis.getChannel();
// No space left in buffers, this should return 0
long bytesRead = fc.read(dstBuffers);
if (bytesRead != 0) throw new RuntimeException("Nonzero return from read");
fc.close();
fis.close();
}
/**
* 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();
}
/*
* TODO: Finish method.
*/
public static String readBytesFromFile(File filename)
throws IOException, OverlappingFileLockException {
if (!filename.exists()) {
return null;
}
try {
ByteBuffer buffer = ByteBuffer.allocate(((int) filename.getTotalSpace() * 4));
fileReader = new FileInputStream(filename).getChannel();
FileLock lock = fileReader.tryLock();
if (lock != null) {
fileReader.read(buffer);
} else {
throw new OverlappingFileLockException();
}
} finally {
fileWriter.close();
}
return "";
}
/*
* Perform a FileChannel.TransferTo on the socket channel.
* <P>
* We have to copy the data into an intermediary app ByteBuffer
* first, then send it through the SSLEngine.
* <P>
* We return the number of bytes actually read out of the
* filechannel. However, the data may actually be stuck
* in the fileChannelBB or the outNetBB. The caller
* is responsible for making sure to call dataFlush()
* before shutting down.
*/
long transferTo(FileChannel fc, long pos, long len) throws IOException {
if (!initialHSComplete) {
throw new IllegalStateException();
}
if (fileChannelBB == null) {
fileChannelBB = ByteBuffer.allocate(appBBSize);
fileChannelBB.limit(0);
}
fileChannelBB.compact();
int fileRead = fc.read(fileChannelBB);
fileChannelBB.flip();
/*
* We ignore the return value here, we return the
* number of bytes actually consumed from the the file.
* We'll flush the output buffer before we start shutting down.
*/
doWrite(fileChannelBB);
return fileRead;
}
public static void main(String[] argv) {
if (argv.length != 3) {
usage();
}
String tempFile = argv[0];
String testFile = argv[1];
int fileSize = Integer.valueOf(argv[2]).intValue();
int exitcode = 0;
int numRead;
int numThisBuf;
int numWritten;
if ((fileSize <= 0) || (fileSize % 4096 != 0)) {
System.out.println("Error: size is not a multiple of 4096!!!!!!");
System.out.println();
usage();
}
try {
int bufSize = 4096;
byte[] inBytes = new byte[bufSize];
byte[] outBytes = new byte[bufSize];
Random ioRandom = new Random(2006);
ioRandom.nextBytes(outBytes);
ByteBuffer inBuf = ByteBuffer.allocate(bufSize);
ByteBuffer outBuf = ByteBuffer.wrap(outBytes);
//
// Loop forever
//
while (true) {
//
// Write the temporary file
//
FileOutputStream fos = new FileOutputStream(tempFile);
FileChannel foc = fos.getChannel();
numWritten = 0;
while (numWritten < fileSize) {
outBuf.clear(); // sets limit to capacity & position to zero
while (outBuf.hasRemaining()) {
numWritten += foc.write(outBuf);
}
}
//
// Move to permanent location
//
FileChannel srcChannel = new FileInputStream(tempFile).getChannel();
FileChannel dstChannel = new FileOutputStream(testFile).getChannel();
dstChannel.transferFrom(srcChannel, 0, srcChannel.size());
srcChannel.close();
dstChannel.close();
boolean success = (new File(tempFile)).delete();
if (!success) {
System.out.println("Warning: unable to delete temporary file");
}
//
// Read and compare
//
FileInputStream fis = new FileInputStream(testFile);
FileChannel fic = fis.getChannel();
for (numRead = 0, numThisBuf = 0; numRead < fileSize; numThisBuf = 0) {
inBuf.rewind(); // Set the buffer position to 0
numThisBuf = fic.read(inBuf);
while (numThisBuf < bufSize) {
numThisBuf += fic.read(inBuf);
}
numRead += bufSize;
inBuf.rewind(); // Set the buffer position to 0
inBuf.get(inBytes);
boolean same = Arrays.equals(inBytes, outBytes);
if (same = false) {
System.out.println("Data read does not equal data written at " + numRead + " bytes");
}
}
}
} catch (FileNotFoundException fnfe) {
fnfe.printStackTrace(System.err);
exitcode = 1;
// break;
} catch (SecurityException se) {
se.printStackTrace(System.err);
exitcode = 1;
// break;
} catch (Throwable t) {
t.printStackTrace(System.err);
exitcode = 1;
}
System.exit(exitcode);
}