header.ident = LittleLong(header.ident);
	if (header.ident != AASID)
	{
		AAS_Error("%s is not an AAS file\n", filename);
		fclose(fp);
		return false;
	} //end if
	//check the version
	header.version = LittleLong(header.version);
	if (header.version != AASVERSION_OLD && header.version != AASVERSION)
	{
		AAS_Error("%s is version %i, not %i\n", filename, header.version, AASVERSION);
		fclose(fp);
		return false;
	} //end if
	//
	if (header.version == AASVERSION)
	{
		AAS_DData((unsigned char *) &header + 8, sizeof(aas_header_t) - 8);
	} //end if
	aasworld.bspchecksum = LittleLong(header.bspchecksum);
	//load the lumps:
	//bounding boxes
	offset = fpoffset + LittleLong(header.lumps[AASLUMP_BBOXES].fileofs);
	length = LittleLong(header.lumps[AASLUMP_BBOXES].filelen);
	aasworld.bboxes = (aas_bbox_t *) AAS_LoadAASLump(fp, offset, length, aasworld.bboxes);
	if (!aasworld.bboxes) return false;
	aasworld.numbboxes = length / sizeof(aas_bbox_t);
	//vertexes
	offset = fpoffset + LittleLong(header.lumps[AASLUMP_VERTEXES].fileofs);
	length = LittleLong(header.lumps[AASLUMP_VERTEXES].filelen);
	aasworld.vertexes = (aas_vertex_t *) AAS_LoadAASLump(fp, offset, length, aasworld.vertexes);
	if (!aasworld.vertexes) return false;
	aasworld.numvertexes = length / sizeof(aas_vertex_t);
	//planes
	offset = fpoffset + LittleLong(header.lumps[AASLUMP_PLANES].fileofs);
	length = LittleLong(header.lumps[AASLUMP_PLANES].filelen);
	aasworld.planes = (aas_plane_t *) AAS_LoadAASLump(fp, offset, length, aasworld.planes);
	if (!aasworld.planes) return false;
	aasworld.numplanes = length / sizeof(aas_plane_t);
	//edges
	offset = fpoffset + LittleLong(header.lumps[AASLUMP_EDGES].fileofs);
	length = LittleLong(header.lumps[AASLUMP_EDGES].filelen);
	aasworld.edges = (aas_edge_t *) AAS_LoadAASLump(fp, offset, length, aasworld.edges);
	if (!aasworld.edges) return false;
	aasworld.numedges = length / sizeof(aas_edge_t);
	//edgeindex
	offset = fpoffset + LittleLong(header.lumps[AASLUMP_EDGEINDEX].fileofs);
	length = LittleLong(header.lumps[AASLUMP_EDGEINDEX].filelen);
	aasworld.edgeindex = (aas_edgeindex_t *) AAS_LoadAASLump(fp, offset, length, aasworld.edgeindex);
	if (!aasworld.edgeindex) return false;
	aasworld.edgeindexsize = length / sizeof(aas_edgeindex_t);
	//faces
	offset = fpoffset + LittleLong(header.lumps[AASLUMP_FACES].fileofs);
	length = LittleLong(header.lumps[AASLUMP_FACES].filelen);
	aasworld.faces = (aas_face_t *) AAS_LoadAASLump(fp, offset, length, aasworld.faces);
	if (!aasworld.faces) return false;
	aasworld.numfaces = length / sizeof(aas_face_t);
	//faceindex
	offset = fpoffset + LittleLong(header.lumps[AASLUMP_FACEINDEX].fileofs);
	length = LittleLong(header.lumps[AASLUMP_FACEINDEX].filelen);
	aasworld.faceindex = (aas_faceindex_t *) AAS_LoadAASLump(fp, offset, length, aasworld.faceindex);
	if (!aasworld.faceindex) return false;
	aasworld.faceindexsize = length / sizeof(int);
	//convex areas
	offset = fpoffset + LittleLong(header.lumps[AASLUMP_AREAS].fileofs);
	length = LittleLong(header.lumps[AASLUMP_AREAS].filelen);
	aasworld.areas = (aas_area_t *) AAS_LoadAASLump(fp, offset, length, aasworld.areas);
	if (!aasworld.areas) return false;
	aasworld.numareas = length / sizeof(aas_area_t);
	//area settings
	offset = fpoffset + LittleLong(header.lumps[AASLUMP_AREASETTINGS].fileofs);
	length = LittleLong(header.lumps[AASLUMP_AREASETTINGS].filelen);
	aasworld.areasettings = (aas_areasettings_t *) AAS_LoadAASLump(fp, offset, length, aasworld.areasettings);
	if (!aasworld.areasettings) return false;
	aasworld.numareasettings = length / sizeof(aas_areasettings_t);
	//reachability list
	offset = fpoffset + LittleLong(header.lumps[AASLUMP_REACHABILITY].fileofs);
	length = LittleLong(header.lumps[AASLUMP_REACHABILITY].filelen);
	aasworld.reachability = (aas_reachability_t *) AAS_LoadAASLump(fp, offset, length, aasworld.reachability);
	if (length && !aasworld.reachability) return false;
	aasworld.reachabilitysize = length / sizeof(aas_reachability_t);
	//nodes
	offset = fpoffset + LittleLong(header.lumps[AASLUMP_NODES].fileofs);
	length = LittleLong(header.lumps[AASLUMP_NODES].filelen);
	aasworld.nodes = (aas_node_t *) AAS_LoadAASLump(fp, offset, length, aasworld.nodes);
	if (!aasworld.nodes) return false;
	aasworld.numnodes = length / sizeof(aas_node_t);
	//cluster portals
	offset = fpoffset + LittleLong(header.lumps[AASLUMP_PORTALS].fileofs);
	length = LittleLong(header.lumps[AASLUMP_PORTALS].filelen);
	aasworld.portals = (aas_portal_t *) AAS_LoadAASLump(fp, offset, length, aasworld.portals);
	if (length && !aasworld.portals) return false;
	aasworld.numportals = length / sizeof(aas_portal_t);
	//cluster portal index
	offset = fpoffset + LittleLong(header.lumps[AASLUMP_PORTALINDEX].fileofs);
	length = LittleLong(header.lumps[AASLUMP_PORTALINDEX].filelen);
	aasworld.portalindex = (aas_portalindex_t *) AAS_LoadAASLump(fp, offset, length, aasworld.portalindex);
	if (length && !aasworld.portalindex) return false;
	aasworld.portalindexsize = length / sizeof(aas_portalindex_t);
	//clusters
	offset = fpoffset + LittleLong(header.lumps[AASLUMP_CLUSTERS].fileofs);
	length = LittleLong(header.lumps[AASLUMP_CLUSTERS].filelen);
	aasworld.clusters = (aas_cluster_t *) AAS_LoadAASLump(fp, offset, length, aasworld.clusters);
	if (length && !aasworld.clusters) return false;
	aasworld.numclusters = length / sizeof(aas_cluster_t);
	//swap everything
	AAS_SwapAASData();
	//aas file is loaded
	aasworld.loaded = true;
	//close the file
	fclose(fp);
	return true;
} //end of the function AAS_LoadAASFile
//===========================================================================
//
// Parameter:				-
// Returns:					-
// Changes Globals:		-
//===========================================================================
int AAS_WriteAASLump(FILE *fp, aas_header_t *h, int lumpnum, void *data, int length)
{
	aas_lump_t *lump;

	lump = &h->lumps[lumpnum];
	
	lump->fileofs = LittleLong(ftell(fp));
	lump->filelen = LittleLong(length);

	if (length > 0)
	{
		if (fwrite(data, length, 1, fp) < 1)
		{
			Log_Print("error writing lump %s\n", lumpnum);
			fclose(fp);
			return false;
		} //end if
	} //end if
	return true;
} //end of the function AAS_WriteAASLump
//===========================================================================
//
// Parameter:				-
// Returns:					-
// Changes Globals:		-
//===========================================================================
void AAS_ShowNumReachabilities(int tt, char *name)
{
	int i, num;

	num = 0;
	for (i = 0; i < aasworld.reachabilitysize; i++)
	{
		if ((aasworld.reachability[i].traveltype & TRAVELTYPE_MASK) == tt)
			num++;
	} //end for
	Log_Print("%6d %s\n", num, name);
} //end of the function AAS_ShowNumReachabilities
//===========================================================================
//
// Parameter:				-
// Returns:					-
// Changes Globals:		-
//===========================================================================
void AAS_ShowTotals(void)
{
	Log_Print("numvertexes = %d\r\n", aasworld.numvertexes);
	Log_Print("numplanes = %d\r\n", aasworld.numplanes);
	Log_Print("numedges = %d\r\n", aasworld.numedges);
	Log_Print("edgeindexsize = %d\r\n", aasworld.edgeindexsize);
	Log_Print("numfaces = %d\r\n", aasworld.numfaces);
	Log_Print("faceindexsize = %d\r\n", aasworld.faceindexsize);
	Log_Print("numareas = %d\r\n", aasworld.numareas);
	Log_Print("numareasettings = %d\r\n", aasworld.numareasettings);
	Log_Print("reachabilitysize = %d\r\n", aasworld.reachabilitysize);
	Log_Print("numnodes = %d\r\n", aasworld.numnodes);
	Log_Print("numportals = %d\r\n", aasworld.numportals);
	Log_Print("portalindexsize = %d\r\n", aasworld.portalindexsize);
	Log_Print("numclusters = %d\r\n", aasworld.numclusters);
	AAS_ShowNumReachabilities(TRAVEL_WALK, "walk");
	AAS_ShowNumReachabilities(TRAVEL_CROUCH, "crouch");
	AAS_ShowNumReachabilities(TRAVEL_BARRIERJUMP, "barrier jump");
	AAS_ShowNumReachabilities(TRAVEL_JUMP, "jump");
	AAS_ShowNumReachabilities(TRAVEL_LADDER, "ladder");
	AAS_ShowNumReachabilities(TRAVEL_WALKOFFLEDGE, "walk off ledge");
	AAS_ShowNumReachabilities(TRAVEL_SWIM, "swim");
	AAS_ShowNumReachabilities(TRAVEL_WATERJUMP, "water jump");
	AAS_ShowNumReachabilities(TRAVEL_TELEPORT, "teleport");
	AAS_ShowNumReachabilities(TRAVEL_ELEVATOR, "elevator");
	AAS_ShowNumReachabilities(TRAVEL_ROCKETJUMP, "rocket jump");
	AAS_ShowNumReachabilities(TRAVEL_BFGJUMP, "bfg jump");
	AAS_ShowNumReachabilities(TRAVEL_GRAPPLEHOOK, "grapple hook");
	AAS_ShowNumReachabilities(TRAVEL_DOUBLEJUMP, "double jump");
	AAS_ShowNumReachabilities(TRAVEL_RAMPJUMP, "ramp jump");
	AAS_ShowNumReachabilities(TRAVEL_STRAFEJUMP, "strafe jump");
	AAS_ShowNumReachabilities(TRAVEL_JUMPPAD, "jump pad");
	AAS_ShowNumReachabilities(TRAVEL_FUNCBOB, "func bob");
} //end of the function AAS_ShowTotals
//===========================================================================
// aas data is useless after writing to file because it is byte swapped
//
// Parameter:				-
// Returns:					-
// Changes Globals:		-
//===========================================================================
qboolean AAS_WriteAASFile(char *filename)
{
	aas_header_t header;
	FILE *fp;

	Log_Print("writing %s\n", filename);
	AAS_ShowTotals();
	//swap the aas data
	AAS_SwapAASData();
	//initialize the file header
	memset(&header, 0, sizeof(aas_header_t));
	header.ident = LittleLong(AASID);
	header.version = LittleLong(AASVERSION);
	header.bspchecksum = LittleLong(aasworld.bspchecksum);
	//open a new file
	fp = fopen(filename, "wb");
	if (!fp)
	{
		Log_Print("error opening %s\n", filename);
		return false;
	} //end if
	//write the header
	if (fwrite(&header, sizeof(aas_header_t), 1, fp) < 1)
	{
		fclose(fp);
		return false;
	} //end if
	//add the data lumps to the file
	if (!AAS_WriteAASLump(fp, &header, AASLUMP_BBOXES, aasworld.bboxes,
		aasworld.numbboxes * sizeof(aas_bbox_t))) return false;
	if (!AAS_WriteAASLump(fp, &header, AASLUMP_VERTEXES, aasworld.vertexes,
		aasworld.numvertexes * sizeof(aas_vertex_t))) return false;
	if (!AAS_WriteAASLump(fp, &header, AASLUMP_PLANES, aasworld.planes,
		aasworld.numplanes * sizeof(aas_plane_t))) return false;
	if (!AAS_WriteAASLump(fp, &header, AASLUMP_EDGES, aasworld.edges,
		aasworld.numedges * sizeof(aas_edge_t))) return false;
	if (!AAS_WriteAASLump(fp, &header, AASLUMP_EDGEINDEX, aasworld.edgeindex,
		aasworld.edgeindexsize * sizeof(aas_edgeindex_t))) return false;
	if (!AAS_WriteAASLump(fp, &header, AASLUMP_FACES, aasworld.faces,
		aasworld.numfaces * sizeof(aas_face_t))) return false;
	if (!AAS_WriteAASLump(fp, &header, AASLUMP_FACEINDEX, aasworld.faceindex,
		aasworld.faceindexsize * sizeof(aas_faceindex_t))) return false;
	if (!AAS_WriteAASLump(fp, &header, AASLUMP_AREAS, aasworld.areas,
		aasworld.numareas * sizeof(aas_area_t))) return false;
	if (!AAS_WriteAASLump(fp, &header, AASLUMP_AREASETTINGS, aasworld.areasettings,
		aasworld.numareasettings * sizeof(aas_areasettings_t))) return false;
	if (!AAS_WriteAASLump(fp, &header, AASLUMP_REACHABILITY, aasworld.reachability,
		aasworld.reachabilitysize * sizeof(aas_reachability_t))) return false;
	if (!AAS_WriteAASLump(fp, &header, AASLUMP_NODES, aasworld.nodes,
		aasworld.numnodes * sizeof(aas_node_t))) return false;
	if (!AAS_WriteAASLump(fp, &header, AASLUMP_PORTALS, aasworld.portals,
		aasworld.numportals * sizeof(aas_portal_t))) return false;
	if (!AAS_WriteAASLump(fp, &header, AASLUMP_PORTALINDEX, aasworld.portalindex,
		aasworld.portalindexsize * sizeof(aas_portalindex_t))) return false;
	if (!AAS_WriteAASLump(fp, &header, AASLUMP_CLUSTERS, aasworld.clusters,
		aasworld.numclusters * sizeof(aas_cluster_t))) return false;
	//rewrite the header with the added lumps
	fseek(fp, 0, SEEK_SET);
	AAS_DData((unsigned char *) &header + 8, sizeof(aas_header_t) - 8);
	if (fwrite(&header, sizeof(aas_header_t), 1, fp) < 1)
	{
		fclose(fp);
		return false;
	} //end if
	//close the file
	fclose(fp);
	return true;
} //end of the function AAS_WriteAASFile