@Override
public void writeBytes(byte[] b, int offset, int length) throws IOException {
int bytesLeft = bufferSize - bufferPosition;
// is there enough space in the buffer?
if (bytesLeft >= length) {
// we add the data to the end of the buffer
System.arraycopy(b, offset, buffer, bufferPosition, length);
bufferPosition += length;
// if the buffer is full, flush it
if (bufferSize - bufferPosition == 0) flush();
} else {
// is data larger then buffer?
if (length > bufferSize) {
// we flush the buffer
if (bufferPosition > 0) flush();
// and write data at once
crc.update(b, offset, length);
flushBuffer(b, offset, length);
bufferStart += length;
} else {
// we fill/flush the buffer (until the input is written)
int pos = 0; // position in the input data
int pieceLength;
while (pos < length) {
pieceLength = (length - pos < bytesLeft) ? length - pos : bytesLeft;
System.arraycopy(b, pos + offset, buffer, bufferPosition, pieceLength);
pos += pieceLength;
bufferPosition += pieceLength;
// if the buffer is full, flush it
bytesLeft = bufferSize - bufferPosition;
if (bytesLeft == 0) {
flush();
bytesLeft = bufferSize;
}
}
}
}
}
@Override
public long getChecksum() throws IOException {
flush();
return crc.getValue();
}
@Override
public void writeByte(byte b) throws IOException {
if (bufferPosition >= bufferSize) flush();
buffer[bufferPosition++] = b;
}
@Override
public void close() throws IOException {
flush();
}