Examples with FileChannel java.nio.channels.FileChannel used on opensource projects

Example 76 with FileChannel

use of java.nio.channels.FileChannel in project MusicDNA by harjot-oberai.

the class MP3File method readV2Tag.

/**
     * Read V2tag if exists
     *
     * TODO:shouldn'timer we be handing TagExceptions:when will they be thrown
     *
     * @param file
     * @param loadOptions
     * @throws IOException
     * @throws TagException
     */
private void readV2Tag(File file, int loadOptions, int startByte) throws IOException, TagException {
    //a buffer then we can read the IDv2 information without needing any more File I/O
    if (startByte >= AbstractID3v2Tag.TAG_HEADER_LENGTH) {
        logger.finer("Attempting to read id3v2tags");
        FileInputStream fis = null;
        FileChannel fc = null;
        ByteBuffer bb;
        try {
            fis = new FileInputStream(file);
            fc = fis.getChannel();
            // avoid using fc.map method since it does not work on Android ICS and JB. Bug report: https://code.google.com/p/android/issues/detail?id=53637
            // bb = fc.map(FileChannel.MapMode.READ_ONLY,0,startByte);
            bb = ByteBuffer.allocate(startByte);
            fc.read(bb, 0);
        } finally {
            if (fc != null) {
                fc.close();
            }
            if (fis != null) {
                fis.close();
            }
        }
        try {
            bb.rewind();
            if ((loadOptions & LOAD_IDV2TAG) != 0) {
                logger.config("Attempting to read id3v2tags");
                try {
                    this.setID3v2Tag(new ID3v24Tag(bb, file.getName()));
                } catch (TagNotFoundException ex) {
                    logger.config("No id3v24 tag found");
                }
                try {
                    if (id3v2tag == null) {
                        this.setID3v2Tag(new ID3v23Tag(bb, file.getName()));
                    }
                } catch (TagNotFoundException ex) {
                    logger.config("No id3v23 tag found");
                }
                try {
                    if (id3v2tag == null) {
                        this.setID3v2Tag(new ID3v22Tag(bb, file.getName()));
                    }
                } catch (TagNotFoundException ex) {
                    logger.config("No id3v22 tag found");
                }
            }
        } finally {
            bb.clear();
        }
    } else {
        logger.config("Not enough room for valid id3v2 tag:" + startByte);
    }
}

Example 77 with FileChannel

use of java.nio.channels.FileChannel in project MusicDNA by harjot-oberai.

the class MP3File method isFilePortionNull.

/**
     *
     * @param startByte
     * @param endByte
     * @return
     * @throws Exception
     *
     * @return true if all the bytes between in the file between startByte and endByte are null, false
     * otherwise
     */
private boolean isFilePortionNull(int startByte, int endByte) throws IOException {
    logger.config("Checking file portion:" + Hex.asHex(startByte) + ":" + Hex.asHex(endByte));
    FileInputStream fis = null;
    FileChannel fc = null;
    try {
        fis = new FileInputStream(file);
        fc = fis.getChannel();
        fc.position(startByte);
        ByteBuffer bb = ByteBuffer.allocateDirect(endByte - startByte);
        fc.read(bb);
        while (bb.hasRemaining()) {
            if (bb.get() != 0) {
                return false;
            }
        }
    } finally {
        if (fc != null) {
            fc.close();
        }
        if (fis != null) {
            fis.close();
        }
    }
    return true;
}

Example 78 with FileChannel

use of java.nio.channels.FileChannel in project MusicDNA by harjot-oberai.

the class Mp4AtomTree method buildTree.

/**
     * Build a tree of the atoms in the file
     *
     * @param raf
     * @param closeExit false to keep randomfileacces open, only used when randomaccessfile already being used
     * @return
     * @throws java.io.IOException
     * @throws org.jaudiotagger.audio.exceptions.CannotReadException
     */
public DefaultTreeModel buildTree(RandomAccessFile raf, boolean closeExit) throws IOException, CannotReadException {
    FileChannel fc = null;
    try {
        fc = raf.getChannel();
        //make sure at start of file
        fc.position(0);
        //Build up map of nodes
        rootNode = new DefaultMutableTreeNode();
        dataTree = new DefaultTreeModel(rootNode);
        //Iterate though all the top level Nodes
        ByteBuffer headerBuffer = ByteBuffer.allocate(Mp4BoxHeader.HEADER_LENGTH);
        while (fc.position() < fc.size()) {
            Mp4BoxHeader boxHeader = new Mp4BoxHeader();
            headerBuffer.clear();
            fc.read(headerBuffer);
            headerBuffer.rewind();
            try {
                boxHeader.update(headerBuffer);
            } catch (NullBoxIdException ne) {
                //If we only get this error after all the expected data has been found we allow it
                if (moovNode != null & mdatNode != null) {
                    NullPadding np = new NullPadding(fc.position() - Mp4BoxHeader.HEADER_LENGTH, fc.size());
                    DefaultMutableTreeNode trailingPaddingNode = new DefaultMutableTreeNode(np);
                    rootNode.add(trailingPaddingNode);
                    logger.warning(ErrorMessage.NULL_PADDING_FOUND_AT_END_OF_MP4.getMsg(np.getFilePos()));
                    break;
                } else {
                    //File appears invalid
                    throw ne;
                }
            }
            boxHeader.setFilePos(fc.position() - Mp4BoxHeader.HEADER_LENGTH);
            DefaultMutableTreeNode newAtom = new DefaultMutableTreeNode(boxHeader);
            //Go down moov
            if (boxHeader.getId().equals(Mp4AtomIdentifier.MOOV.getFieldName())) {
                //and finish
                if (moovNode != null & mdatNode != null) {
                    logger.warning(ErrorMessage.ADDITIONAL_MOOV_ATOM_AT_END_OF_MP4.getMsg(fc.position() - Mp4BoxHeader.HEADER_LENGTH));
                    break;
                }
                moovNode = newAtom;
                moovHeader = boxHeader;
                long filePosStart = fc.position();
                moovBuffer = ByteBuffer.allocate(boxHeader.getDataLength());
                int bytesRead = fc.read(moovBuffer);
                //If Moov atom is incomplete we are not going to be able to read this file properly
                if (bytesRead < boxHeader.getDataLength()) {
                    String msg = ErrorMessage.ATOM_LENGTH_LARGER_THAN_DATA.getMsg(boxHeader.getId(), boxHeader.getDataLength(), bytesRead);
                    throw new CannotReadException(msg);
                }
                moovBuffer.rewind();
                buildChildrenOfNode(moovBuffer, newAtom);
                fc.position(filePosStart);
            } else if (boxHeader.getId().equals(Mp4AtomIdentifier.FREE.getFieldName())) {
                //Might be multiple in different locations
                freeNodes.add(newAtom);
            } else if (boxHeader.getId().equals(Mp4AtomIdentifier.MDAT.getFieldName())) {
                //mdatNode always points to the last mDatNode, normally there is just one mdatnode but do have
                //a valid example of multiple mdatnode
                //if(mdatNode!=null)
                //{
                //    throw new CannotReadException(ErrorMessage.MP4_FILE_CONTAINS_MULTIPLE_DATA_ATOMS.getMsg());
                //}
                mdatNode = newAtom;
                mdatNodes.add(newAtom);
            }
            rootNode.add(newAtom);
            fc.position(fc.position() + boxHeader.getDataLength());
        }
        return dataTree;
    } finally {
        //now rather than later when try and write to it.
        if (mdatNode == null) {
            throw new CannotReadException(ErrorMessage.MP4_CANNOT_FIND_AUDIO.getMsg());
        }
        if (closeExit) {
            fc.close();
        }
    }
}

Example 79 with FileChannel

use of java.nio.channels.FileChannel in project MusicDNA by harjot-oberai.

the class AbstractID3v1Tag method delete.

/**
     * Delete tag from file
     * Looks for tag and if found lops it off the file.
     *
     * @param file to delete the tag from
     * @throws IOException if there was a problem accessing the file
     */
public void delete(RandomAccessFile file) throws IOException {
    //Read into Byte Buffer
    logger.config("Deleting ID3v1 from file if exists");
    FileChannel fc;
    ByteBuffer byteBuffer;
    fc = file.getChannel();
    if (file.length() < TAG_LENGTH) {
        throw new IOException("File not not appear large enough to contain a tag");
    }
    fc.position(file.length() - TAG_LENGTH);
    byteBuffer = ByteBuffer.allocate(TAG_LENGTH);
    fc.read(byteBuffer);
    byteBuffer.rewind();
    if (AbstractID3v1Tag.seekForV1OrV11Tag(byteBuffer)) {
        try {
            logger.config("Deleted ID3v1 tag");
            file.setLength(file.length() - TAG_LENGTH);
        } catch (IOException ex) {
            logger.severe("Unable to delete existing ID3v1 Tag:" + ex.getMessage());
        }
    } else {
        logger.config("Unable to find ID3v1 tag to deleteField");
    }
}

Example 80 with FileChannel

use of java.nio.channels.FileChannel in project MusicDNA by harjot-oberai.

the class AbstractID3v2Tag method getV2TagSizeIfExists.

/**
     * Checks to see if the file contains an ID3tag and if so return its size as reported in
     * the tag header  and return the size of the tag (including header), if no such tag exists return
     * zero.
     *
     * @param file
     * @return the end of the tag in the file or zero if no tag exists.
     * @throws java.io.IOException
     */
public static long getV2TagSizeIfExists(File file) throws IOException {
    FileInputStream fis = null;
    FileChannel fc = null;
    ByteBuffer bb = null;
    try {
        //Files
        fis = new FileInputStream(file);
        fc = fis.getChannel();
        //Read possible Tag header  Byte Buffer
        bb = ByteBuffer.allocate(TAG_HEADER_LENGTH);
        fc.read(bb);
        bb.flip();
        if (bb.limit() < (TAG_HEADER_LENGTH)) {
            return 0;
        }
    } finally {
        if (fc != null) {
            fc.close();
        }
        if (fis != null) {
            fis.close();
        }
    }
    //ID3 identifier
    byte[] tagIdentifier = new byte[FIELD_TAGID_LENGTH];
    bb.get(tagIdentifier, 0, FIELD_TAGID_LENGTH);
    if (!(Arrays.equals(tagIdentifier, TAG_ID))) {
        return 0;
    }
    //Is it valid Major Version
    byte majorVersion = bb.get();
    if ((majorVersion != ID3v22Tag.MAJOR_VERSION) && (majorVersion != ID3v23Tag.MAJOR_VERSION) && (majorVersion != ID3v24Tag.MAJOR_VERSION)) {
        return 0;
    }
    //Skip Minor Version
    bb.get();
    //Skip Flags
    bb.get();
    //Get size as recorded in frame header
    int frameSize = ID3SyncSafeInteger.bufferToValue(bb);
    //addField header size to frame size
    frameSize += TAG_HEADER_LENGTH;
    return frameSize;
}