113 lines
2.9 KiB
C++
113 lines
2.9 KiB
C++
/**
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* PANDA 3D SOFTWARE
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* Copyright (c) Carnegie Mellon University. All rights reserved.
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*
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* All use of this software is subject to the terms of the revised BSD
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* license. You should have received a copy of this license along
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* with this source code in a file named "LICENSE."
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*
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* @file fltInstanceRef.cxx
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* @author drose
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* @date 2000-08-30
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*/
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#include "fltInstanceRef.h"
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#include "fltRecordReader.h"
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#include "fltRecordWriter.h"
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#include "fltInstanceDefinition.h"
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#include "fltHeader.h"
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TypeHandle FltInstanceRef::_type_handle;
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/**
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*
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*/
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FltInstanceRef::
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FltInstanceRef(FltHeader *header) : FltBead(header) {
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_instance_index = 0;
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}
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/**
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* Returns the instance subtree referenced by this node, or NULL if the
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* reference is invalid.
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*/
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FltInstanceDefinition *FltInstanceRef::
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get_instance() const {
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return _header->get_instance(_instance_index);
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}
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/**
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* Writes a multiple-line description of the record and all of its children.
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* This is a human-readable description, primarily for debugging; to write a
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* flt file, use FltHeader::write_flt().
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*/
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void FltInstanceRef::
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write(std::ostream &out, int indent_level) const {
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indent(out, indent_level) << "instance";
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FltInstanceDefinition *def = _header->get_instance(_instance_index);
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if (def != nullptr) {
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def->write_children(out, indent_level + 2);
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indent(out, indent_level) << "}\n";
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} else {
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out << "\n";
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}
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}
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/**
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* Fills in the information in this bead based on the information given in the
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* indicated datagram, whose opcode has already been read. Returns true on
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* success, false if the datagram is invalid.
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*/
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bool FltInstanceRef::
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extract_record(FltRecordReader &reader) {
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if (!FltBead::extract_record(reader)) {
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return false;
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}
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nassertr(reader.get_opcode() == FO_instance_ref, false);
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DatagramIterator &iterator = reader.get_iterator();
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iterator.skip_bytes(2);
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_instance_index = iterator.get_be_int16();
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check_remaining_size(iterator);
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return true;
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}
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/**
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* Writes this record out to the flt file, along with all of its ancillary
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* records and children records. Returns FE_ok on success, or something else
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* on error.
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*/
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FltError FltInstanceRef::
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write_record_and_children(FltRecordWriter &writer) const {
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// First, make sure our instance definition has already been written.
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FltError result = writer.write_instance_def(_header, _instance_index);
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if (result != FE_ok) {
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return result;
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}
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// Then write out our own record.
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return FltBead::write_record_and_children(writer);
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}
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/**
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* Fills up the current record on the FltRecordWriter with data for this
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* record, but does not advance the writer. Returns true on success, false if
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* there is some error.
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*/
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bool FltInstanceRef::
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build_record(FltRecordWriter &writer) const {
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if (!FltBead::build_record(writer)) {
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return false;
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}
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writer.set_opcode(FO_instance_ref);
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Datagram &datagram = writer.update_datagram();
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datagram.pad_bytes(2);
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datagram.add_be_int16(_instance_index);
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return true;
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}
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