Java Code Examples for java.io.RandomAccessFile#readShort()

public void read(final RandomAccessFile file) throws IOException, InvalidTagException {
    final int size = readHeader(file);
    if (size == 0) {
        throw new InvalidTagException("Empty Frame");
    }
    dataStart = file.readInt();
    dataLength = file.readInt();
    indexPoints = (int) file.readShort();
    bitsPerPoint = (int) file.readByte();
    fraction = new short[indexPoints];
    for (int i = 0; i < indexPoints; i++) {
        if (bitsPerPoint == 8) {
            fraction[i] = (short) file.readByte();
        } else if (bitsPerPoint == 16) {
            fraction[i] = file.readShort();
        } else {
            throw new InvalidTagException("ASPI bits per point wasn't 8 or 16");
        }
    }
}
 

private static Block loadBlockFromIndividualFile(long blockHeight) {

        Block block = null;
        File file = individualFileForBlockHeight(blockHeight);
        if (file.exists()) {
            try {
                RandomAccessFile blockFileReader = new RandomAccessFile(file, "r");
                int numberOfBlocks = blockFileReader.readShort();
                block = Block.fromFile(blockFileReader);
                blockFileReader.close();
            } catch (Exception ignored) { }
        }

        return block;
    }
 

protected void read(RandomAccessFile raf) throws IOException {
    this._fhSize = raf.readShort();
    this._pageSize = raf.readInt();
    this._totalPageCount = raf.readLong();
    this._firstFreePage = raf.readLong();
    this._lastFreePage = raf.readLong();
    this._pageHeaderSize = raf.readByte();
}
 

/**
 * Creates a new PersistentMap.
 * @param rootFolder root folder to read/write files to
 * @param version    tells the version of the data stored in the persistent map; if it does not equal to the version of the persistent file, it will be cleared automatically
 * @throws IOException if the persistent map could not be initialized
 */
public PersistentMap( final File rootFolder, final short version ) throws IOException {
	indexFile = new RandomAccessFile( new File( rootFolder, "index" ), "rw" );
	if ( indexFile.getChannel().tryLock() == null )
		throw new IOException( "Index file is already in use!" );
	
	dataFile = new RandomAccessFile( new File( rootFolder, "data"  ), "rw" );
	if ( dataFile.getChannel().tryLock() == null )
		throw new IOException( "Data file is already in use!" );
	
	this.version = version;
	final long indexSize = indexFile.length();
	if ( indexSize == 0 || indexFile.readShort() != version ) // New file or old version?
		clear();
	else {
		// Read the index file into memory
		String    key;
		ValueInfo valueInfo;
		while ( indexFile.getFilePointer() < indexSize ) {
			key = indexFile.readUTF();
			valueInfo = new ValueInfo();
			valueInfo.position = indexFile.readInt();
			valueInfo.size     = indexFile.readInt();
			indexMap.put( key, valueInfo );
		}
	}
}
 

private void parseInner(RandomAccessFile randomAccessFile) throws IOException {
	int majorVersion = randomAccessFile.readShort();
	int minorVersion = randomAccessFile.readShort();
	int numOfTables = randomAccessFile.readShort();
	if (majorVersion != 1 || minorVersion != 0) {
		return;
	}
	// jump to TableDirectory struct
	randomAccessFile.seek(12);
	boolean found = false;
	byte[] buff = new byte[4];
	TableDirectory tableDirectory = new TableDirectory();
	for (int i = 0; i < numOfTables; i++) {
		randomAccessFile.read(buff);
		tableDirectory.name = new String(buff);
		tableDirectory.checkSum = randomAccessFile.readInt();
		tableDirectory.offset = randomAccessFile.readInt();
		tableDirectory.length = randomAccessFile.readInt();
		if ("name".equalsIgnoreCase(tableDirectory.name)) {
			found = true;
			break;
		} else if (tableDirectory.name == null || tableDirectory.name.length() == 0) {
			break;
		}
	}
	// not found table of name
	if (!found) {
		return;
	}
	randomAccessFile.seek(tableDirectory.offset);
	NameTableHeader nameTableHeader = new NameTableHeader();
	nameTableHeader.fSelector = randomAccessFile.readShort();
	nameTableHeader.nRCount = randomAccessFile.readShort();
	nameTableHeader.storageOffset = randomAccessFile.readShort();
	NameRecord nameRecord = new NameRecord();
	for (int i = 0; i < nameTableHeader.nRCount; i++) {
		nameRecord.platformID = randomAccessFile.readShort();
		nameRecord.encodingID = randomAccessFile.readShort();
		nameRecord.languageID = randomAccessFile.readShort();
		nameRecord.nameID = randomAccessFile.readShort();
		nameRecord.stringLength = randomAccessFile.readShort();
		nameRecord.stringOffset = randomAccessFile.readShort();
		long pos = randomAccessFile.getFilePointer();
		byte[] bf = new byte[nameRecord.stringLength];
		long vpos = tableDirectory.offset + nameRecord.stringOffset + nameTableHeader.storageOffset;
		randomAccessFile.seek(vpos);
		randomAccessFile.read(bf);
		String temp = new String(bf, "utf-16");//new String(bf, Charset.forName("utf-16"));
		fontProperties.put(nameRecord.nameID, temp);
		randomAccessFile.seek(pos);
	}
}