/// <summary>
/// Processes the block signature, if present.
/// </summary>
/// <returns> true if the block signature could be processed successfully, false otherwise. </returns>
private bool ProcessBlockSignature(ReadBuffer readBuffer)
{
if (this.mapFileHeader.MapFileInfo.DebugFile)
{
// get and check the block signature
string signatureBlock = readBuffer.ReadUTF8EncodedString(SIGNATURE_LENGTH_BLOCK);
if (!signatureBlock.StartsWith("###TileStart", StringComparison.Ordinal))
{
Logger.Log(LogLevel.Warning, "invalid block signature: " + signatureBlock);
return(false);
}
}
return(true);
}
private IList <Way> ProcessWays(QueryParameters queryParameters, int numberOfWays, BoundingBox boundingBox, bool filterRequired, double tileLatitude, double tileLongitude, ReadBuffer readBuffer)
{
IList <Way> ways = new List <Way>();
Tag[] wayTags = this.mapFileHeader.MapFileInfo.WayTags;
// Extend BoundingBox about wayFilterDistance meters, so that ways crossing the border added
double verticalExpansion = PointUtils.LatitudeDistance(wayFilterDistance);
double horizontalExpansion = PointUtils.LongitudeDistance(wayFilterDistance, Math.Max(Math.Abs(boundingBox.MinY), Math.Abs(boundingBox.MaxY)));
double minLat = Math.Max(MercatorProjection.LATITUDE_MIN, boundingBox.MinY - verticalExpansion);
double minLon = Math.Max(-180, boundingBox.MinX - horizontalExpansion);
double maxLat = Math.Min(MercatorProjection.LATITUDE_MAX, boundingBox.MaxY + verticalExpansion);
double maxLon = Math.Min(180, boundingBox.MaxX + horizontalExpansion);
BoundingBox wayFilterBbox = new BoundingBox(minLon, minLat, maxLon, maxLat);
for (int elementCounter = numberOfWays; elementCounter != 0; --elementCounter)
{
if (this.mapFileHeader.MapFileInfo.DebugFile)
{
// get and check the way signature
string signatureWay = readBuffer.ReadUTF8EncodedString(SIGNATURE_LENGTH_WAY);
if (!signatureWay.StartsWith("---WayStart", StringComparison.Ordinal))
{
Logger.Log(LogLevel.Warning, "invalid way signature: " + signatureWay);
return(null);
}
}
// get the size of the way (VBE-U)
int wayDataSize = readBuffer.ReadUnsignedInt();
if (wayDataSize < 0)
{
Logger.Log(LogLevel.Warning, "invalid way data size: " + wayDataSize);
return(null);
}
if (queryParameters.useTileBitmask)
{
// get the way tile bitmask (2 bytes)
int tileBitmask = readBuffer.ReadShort();
// check if the way is inside the requested tile
if ((queryParameters.queryTileBitmask & tileBitmask) == 0)
{
// skip the rest of the way and continue with the next way
readBuffer.SkipBytes(wayDataSize - 2);
continue;
}
}
else
{
// ignore the way tile bitmask (2 bytes)
readBuffer.SkipBytes(2);
}
// get the special byte which encodes multiple flags
sbyte specialByte = readBuffer.ReadByte();
// bit 1-4 represent the layer
sbyte layer = (sbyte)((int)((uint)(specialByte & WAY_LAYER_BITMASK) >> WAY_LAYER_SHIFT));
// bit 5-8 represent the number of tag IDs
sbyte numberOfTags = (sbyte)(specialByte & WAY_NUMBER_OF_TAGS_BITMASK);
IList <Tag> tags = new List <Tag>();
for (sbyte tagIndex = numberOfTags; tagIndex != 0; --tagIndex)
{
int tagId = readBuffer.ReadUnsignedInt();
if (tagId < 0 || tagId >= wayTags.Length)
{
Logger.Log(LogLevel.Warning, "invalid way tag ID: " + tagId);
return(null);
}
tags.Add(wayTags[tagId]);
}
// get the feature bitmask (1 byte)
sbyte featureByte = readBuffer.ReadByte();
// bit 1-6 enable optional features
bool featureName = (featureByte & WAY_FEATURE_NAME) != 0;
bool featureHouseNumber = (featureByte & WAY_FEATURE_HOUSE_NUMBER) != 0;
bool featureRef = (featureByte & WAY_FEATURE_REF) != 0;
bool featureLabelPosition = (featureByte & WAY_FEATURE_LABEL_POSITION) != 0;
bool featureWayDataBlocksByte = (featureByte & WAY_FEATURE_DATA_BLOCKS_BYTE) != 0;
bool featureWayDoubleDeltaEncoding = (featureByte & WAY_FEATURE_DOUBLE_DELTA_ENCODING) != 0;
// check if the way has a name
if (featureName)
{
tags.Add(new Tag(TAG_KEY_NAME, ExtractLocalized(readBuffer.ReadUTF8EncodedString())));
}
// check if the way has a house number
if (featureHouseNumber)
{
tags.Add(new Tag(TAG_KEY_HOUSE_NUMBER, readBuffer.ReadUTF8EncodedString()));
}
// check if the way has a reference
if (featureRef)
{
tags.Add(new Tag(TAG_KEY_REF, readBuffer.ReadUTF8EncodedString()));
}
Point labelPosition = ReadOptionalLabelPosition(tileLatitude, tileLongitude, featureLabelPosition, readBuffer);
int wayDataBlocks = ReadOptionalWayDataBlocksByte(featureWayDataBlocksByte, readBuffer);
if (wayDataBlocks < 1)
{
Logger.Log(LogLevel.Warning, "invalid number of way data blocks: " + wayDataBlocks);
return(null);
}
for (int wayDataBlock = 0; wayDataBlock < wayDataBlocks; ++wayDataBlock)
{
List <List <Point> > wayNodes = ProcessWayDataBlock(tileLatitude, tileLongitude, featureWayDoubleDeltaEncoding, readBuffer);
if (wayNodes != null)
{
if (filterRequired && wayFilterEnabled)
{
double minX = double.MaxValue;
double minY = double.MaxValue;
double maxX = 0;
double maxY = 0;
for (int i = 0; i < wayNodes.Count; i++)
{
for (int j = 0; j < wayNodes[i].Count; j++)
{
minX = Math.Min(minX, wayNodes[i][j].X);
minY = Math.Min(minY, wayNodes[i][j].Y);
maxX = Math.Max(maxX, wayNodes[i][j].X);
maxY = Math.Max(maxY, wayNodes[i][j].Y);
}
}
if (!wayFilterBbox.Intersects(new BoundingBox(minX, minY, maxX, maxY)))
{
continue;
}
}
ways.Add(new Way(layer, tags, wayNodes, labelPosition));
}
}
}
return(ways);
}
private IList <PointOfInterest> ProcessPOIs(double tileLatitude, double tileLongitude, int numberOfPois, BoundingBox boundingBox, bool filterRequired, ReadBuffer readBuffer)
{
IList <PointOfInterest> pois = new List <PointOfInterest>();
Tag[] poiTags = this.mapFileHeader.MapFileInfo.PoiTags;
for (int elementCounter = numberOfPois; elementCounter != 0; --elementCounter)
{
if (this.mapFileHeader.MapFileInfo.DebugFile)
{
// get and check the POI signature
string signaturePoi = readBuffer.ReadUTF8EncodedString(SIGNATURE_LENGTH_POI);
if (!signaturePoi.StartsWith("***POIStart", StringComparison.Ordinal))
{
Logger.Log(LogLevel.Warning, "invalid POI signature: " + signaturePoi);
return(null);
}
}
// get the POI latitude offset (VBE-S)
double latitude = tileLatitude + PointUtils.MicrodegreesToDegrees(readBuffer.ReadSignedInt());
// get the POI longitude offset (VBE-S)
double longitude = tileLongitude + PointUtils.MicrodegreesToDegrees(readBuffer.ReadSignedInt());
// get the special byte which encodes multiple flags
sbyte specialByte = readBuffer.ReadByte();
// bit 1-4 represent the layer with
sbyte layer = (sbyte)((int)((uint)(specialByte & POI_LAYER_BITMASK) >> POI_LAYER_SHIFT));
// bit 5-8 represent the number of tag IDs
sbyte numberOfTags = (sbyte)(specialByte & POI_NUMBER_OF_TAGS_BITMASK);
IList <Tag> tags = new List <Tag>();
// get the tag IDs (VBE-U)
for (sbyte tagIndex = numberOfTags; tagIndex != 0; --tagIndex)
{
int tagId = readBuffer.ReadUnsignedInt();
if (tagId < 0 || tagId >= poiTags.Length)
{
Logger.Log(LogLevel.Warning, "invalid POI tag ID: " + tagId);
return(null);
}
tags.Add(poiTags[tagId]);
}
// get the feature bitmask (1 byte)
sbyte featureByte = readBuffer.ReadByte();
// bit 1-3 enable optional features
bool featureName = (featureByte & POI_FEATURE_NAME) != 0;
bool featureHouseNumber = (featureByte & POI_FEATURE_HOUSE_NUMBER) != 0;
bool featureElevation = (featureByte & POI_FEATURE_ELEVATION) != 0;
// check if the POI has a name
if (featureName)
{
tags.Add(new Tag(TAG_KEY_NAME, ExtractLocalized(readBuffer.ReadUTF8EncodedString())));
}
// check if the POI has a house number
if (featureHouseNumber)
{
tags.Add(new Tag(TAG_KEY_HOUSE_NUMBER, readBuffer.ReadUTF8EncodedString()));
}
// check if the POI has an elevation
if (featureElevation)
{
tags.Add(new Tag(TAG_KEY_ELE, Convert.ToString(readBuffer.ReadSignedInt())));
}
Point position = new Point(longitude, latitude);
// depending on the zoom level configuration the poi can lie outside
// the tile requested, we filter them out here
if (!filterRequired || boundingBox.Contains(position))
{
pois.Add(new PointOfInterest(layer, tags, position));
}
}
return(pois);
}