/**
* @param recordBb
* @param dgBlock
* @param cgBlock
* @param cnBlock
* @return
* @throws IOException
*/
public static ByteBuffer readStringValues(
ByteBuffer recordBb, DGBLOCK dgBlock, CGBLOCK cgBlock, CNBLOCK cnBlock) throws IOException {
// put pointer to start of record area
recordBb.rewind();
byte[] target = new byte[0];
// iterate over records
for (int i = 0; i < cgBlock.getNoOfRecords(); i++) {
// read record
int recordIdOffset = (dgBlock.getNoRecordIds() > 0) ? 1 : 0;
byte[] record = new byte[cgBlock.getDataRecordSize() + recordIdOffset];
recordBb.get(record);
// skip first bits and read value
BitInputStream bis = new BitInputStream(record);
int skipBits =
(recordIdOffset * 8) + (cnBlock.getByteOffset() * 8) + cnBlock.getNumberOfFirstBits();
bis.skip(skipBits);
byte[] b = bis.readByteArray(cnBlock.getNumberOfBits());
// build string value and append
StringBuffer sb = new StringBuffer();
sb.append(Mdf3Util.readChars(ByteBuffer.wrap(b), b.length));
sb.append((char) '\0');
// add to target
byte[] src = sb.toString().getBytes();
byte[] dest = new byte[target.length + src.length];
System.arraycopy(target, 0, dest, 0, target.length);
System.arraycopy(src, 0, dest, target.length, src.length);
target = dest;
}
return ByteBuffer.wrap(target);
}
/**
* Read the values from the source records.
*
* @param recordBb
* @param dgBlock
* @param cgBlock
* @param cnBlock
* @return
* @throws IOException
*/
public static ByteBuffer readNumberValues(
ByteBuffer recordBb, DGBLOCK dgBlock, CGBLOCK cgBlock, CNBLOCK cnBlock) throws IOException {
// put pointer to start of record area
recordBb.rewind();
// allocate target buffer (byte)
int targetValueSize = cnBlock.getNumberOfBits() / 8;
if (cnBlock.getNumberOfBits() % 8 != 0) {
targetValueSize++;
}
int numberOfTotalBytes = (int) (targetValueSize * cgBlock.getNoOfRecords());
ByteBuffer target = ByteBuffer.allocate(numberOfTotalBytes);
// iterate over records
for (int i = 0; i < cgBlock.getNoOfRecords(); i++) {
// read record
int recordIdOffset = (dgBlock.getNoRecordIds() > 0) ? 1 : 0;
byte[] record = new byte[cgBlock.getDataRecordSize() + recordIdOffset];
recordBb.get(record);
// skip first bits and read value
BitInputStream bis = new BitInputStream(record);
int skipBits =
(recordIdOffset * 8) + (cnBlock.getByteOffset() * 8) + cnBlock.getNumberOfFirstBits();
bis.skip(skipBits);
byte[] b = bis.readByteArray(cnBlock.getNumberOfBits());
// add to buffer
target.put(b);
}
target.rewind();
return target;
}
