Method transform_to_range

src/proxy/Transform.cc:900–1007

  -------------------------------------------------------------------------*/

void
RangeTransform::transform_to_range()
{
  IOBufferReader *reader = m_write_vio.get_reader();
  int64_t         toskip, tosend, avail;
  const int64_t  *end, *start;
  int64_t         prev_end = 0;
  int64_t        *done_byte;

  if (m_current_range >= m_num_range_fields) {
    return;
  }

  end       = &m_ranges[m_current_range]._end;
  done_byte = &m_ranges[m_current_range]._done_byte;
  start     = &m_ranges[m_current_range]._start;
  avail     = reader->read_avail();

  while (true) {
    if (*done_byte < (*start - 1)) {
      toskip = *start - *done_byte - 1;

      if (toskip > avail) {
        toskip = avail;
      }

      if (toskip > 0) {
        reader->consume(toskip);
        *done_byte += toskip;
        avail       = reader->read_avail();
      }
    }

    if (avail > 0) {
      tosend = *end - *done_byte;

      if (tosend > avail) {
        tosend = avail;
      }

      m_output_buf->write(reader, tosend);
      reader->consume(tosend);

      m_done     += tosend;
      *done_byte += tosend;
    }

    if (*done_byte == *end) {
      prev_end = *end;
    }

    // move to next Range if done one
    // ignore bad Range: _done_byte -1, _end -1
    while (*done_byte == *end) {
      m_current_range++;

      if (m_current_range == m_num_range_fields) {
        if (m_num_range_fields > 1) {