private final void switchCurrentBuffer() throws IOException {
if (currentBufferIndex == file.numBuffers()) {
currentBuffer = file.addBuffer(BUFFER_SIZE);
} else {
currentBuffer = file.getBuffer(currentBufferIndex);
}
bufferPosition = 0;
bufferStart = (long) BUFFER_SIZE * (long) currentBufferIndex;
bufferLength = currentBuffer.length;
}
/** Copy the current contents of this buffer to the named output. */
public void writeTo(IndexOutput out) throws IOException {
flush();
final long end = file.length;
long pos = 0;
int buffer = 0;
while (pos < end) {
int length = BUFFER_SIZE;
long nextPos = pos + length;
if (nextPos > end) { // at the last buffer
length = (int) (end - pos);
}
out.writeBytes(file.getBuffer(buffer++), length);
pos = nextPos;
}
}
/** Copy the current contents of this buffer to output byte array */
public void writeTo(byte[] bytes, int offset) throws IOException {
flush();
final long end = file.length;
long pos = 0;
int buffer = 0;
int bytesUpto = offset;
while (pos < end) {
int length = BUFFER_SIZE;
long nextPos = pos + length;
if (nextPos > end) { // at the last buffer
length = (int) (end - pos);
}
System.arraycopy(file.getBuffer(buffer++), 0, bytes, bytesUpto, length);
bytesUpto += length;
pos = nextPos;
}
}
private final void switchCurrentBuffer(boolean enforceEOF) throws IOException {
bufferStart = (long) BUFFER_SIZE * (long) currentBufferIndex;
if (currentBufferIndex >= file.numBuffers()) {
// end of file reached, no more buffers left
if (enforceEOF) {
throw new EOFException("Read past EOF (resource: " + this + ")");
} else {
// Force EOF if a read takes place at this position
currentBufferIndex--;
bufferPosition = BUFFER_SIZE;
}
} else {
currentBuffer = file.getBuffer(currentBufferIndex);
bufferPosition = 0;
long buflen = length - bufferStart;
bufferLength = buflen > BUFFER_SIZE ? BUFFER_SIZE : (int) buflen;
}
}