private NodeWayBundle ProcessBlock(QueryParameters queryParameters, SubFileParameter subFileParameter)
{
if (!processBlockSignature())
{
return(null);
}
ZoomTable zoomTable = readZoomTable(subFileParameter);
if (zoomTable == null)
{
return(null);
}
int zoomTableRow = queryParameters.queryZoomLevel - subFileParameter.ZoomLevelMin;
int nodesOnQueryZoomLevel = zoomTable[zoomTableRow].NodesCount;
int waysOnQueryZoomLevel = zoomTable[zoomTableRow].WaysCount;
// get the relative offset to the first stored way in the block
long firstWayOffset = this.readBuffer.ReadUnsignedInt();
if (firstWayOffset < 0)
{
return(null);
}
// add the current buffer position to the relative first way offset
firstWayOffset += this.readBuffer.Position;
if (firstWayOffset > this.readBuffer.Length)
{
return(null);
}
List <Node> nodes = processNodes(nodesOnQueryZoomLevel);
if (nodes == null)
{
return(null);
}
// finished reading nodes, check if the current buffer position is valid
if (this.readBuffer.Position > firstWayOffset)
{
return(null);
}
// move the pointer to the first way
this.readBuffer.Position = firstWayOffset;
List <Way> ways = processWays(queryParameters, waysOnQueryZoomLevel);
if (ways == null)
{
return(null);
}
return(new NodeWayBundle(this.tile, nodes, ways));
}
private ZoomTable readZoomTable(SubFileParameter subFileParameter)
{
int rows = subFileParameter.ZoomLevelMax - subFileParameter.ZoomLevelMin + 1;
ZoomTable zoomTable = new ZoomTable(rows);
int cumulatedNumberOfnodes = 0;
int cumulatedNumberOfWays = 0;
for (int row = 0; row < rows; ++row)
{
cumulatedNumberOfnodes += this.readBuffer.ReadUnsignedInt();
cumulatedNumberOfWays += this.readBuffer.ReadUnsignedInt();
if (cumulatedNumberOfnodes < 0 || cumulatedNumberOfnodes > MAXIMUM_ZOOM_TABLE_OBJECTS)
{
System.Diagnostics.Debug.WriteLine("invalid cumulated number of nodes in row " + row + ' ' + cumulatedNumberOfnodes);
if (this.mapFileHeader.MapFileInfo.DebugFile)
{
System.Diagnostics.Debug.WriteLine(DEBUG_SIGNATURE_BLOCK + this.signatureBlock);
}
return(null);
}
else if (cumulatedNumberOfWays < 0 || cumulatedNumberOfWays > MAXIMUM_ZOOM_TABLE_OBJECTS)
{
System.Diagnostics.Debug.WriteLine("invalid cumulated number of ways in row " + row + ' ' + cumulatedNumberOfWays);
if (this.mapFileHeader.MapFileInfo.DebugFile)
{
System.Diagnostics.Debug.WriteLine(DEBUG_SIGNATURE_BLOCK + this.signatureBlock);
}
return(null);
}
zoomTable[row] = new ZoomTable.ZoomTableEntry(cumulatedNumberOfnodes, cumulatedNumberOfWays);
}
return(zoomTable);
}
