recorderHeader.cxx

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/**
 * PANDA 3D SOFTWARE
 * Copyright (c) Carnegie Mellon University.  All rights reserved.
 *
 * All use of this software is subject to the terms of the revised BSD
 * license.  You should have received a copy of this license along
 * with this source code in a file named "LICENSE."
 *
 * @file recorderHeader.cxx
 * @author drose
 * @date 2004-01-29
 */

#include "recorderHeader.h"
#include "recorderTable.h"
#include "bamReader.h"
#include "bamWriter.h"
#include "config_recorder.h"

TypeHandle RecorderHeader::_type_handle;

/**
 * Tells the BamReader how to create objects of type Lens.
 */
void RecorderHeader::
register_with_read_factory() {
  BamReader::get_factory()->register_factory(get_class_type(), make_from_bam);
}

/**
 * Writes the contents of this object to the datagram for shipping out to a
 * Bam file.
 */
void RecorderHeader::
write_datagram(BamWriter *manager, Datagram &dg) {
  TypedWritable::write_datagram(manager, dg);

  // One day this will need to be upgraded to a uint64, but probably not
  // before 2106.  (In 2038, Unix time will overflow a signed 32-bit number,
  // but this is an unsigned number and will still be good until 2106.)
  dg.add_uint32(_start_time);

  dg.add_int32(_random_seed);
}

/**
 * This function is called by the BamReader's factory when a new object of
 * type Lens is encountered in the Bam file.  It should create the Lens and
 * extract its information from the file.
 */
TypedWritable *RecorderHeader::
make_from_bam(const FactoryParams &params) {
  RecorderHeader *header = new RecorderHeader;
  DatagramIterator scan;
  BamReader *manager;

  parse_params(params, scan, manager);
  header->fillin(scan, manager);

  return header;
}

/**
 * This internal function is called by make_from_bam to read in all of the
 * relevant data from the BamFile for the new RecorderHeader.
 */
void RecorderHeader::
fillin(DatagramIterator &scan, BamReader *manager) {
  TypedWritable::fillin(scan, manager);

  _start_time = scan.get_uint32();
  _random_seed = scan.get_int32();
}