public static void WriteBlobInfo(BinaryWriter writer, BlobIdsInfo info)
{
writer.Write(info.StartPosition);
writer.Write(info.NodesCount);
writer.Write(info.MinNodeId);
writer.Write(info.MaxNodeId);
writer.Write(info.WaysCount);
writer.Write(info.RelationsCount);
}
public static void WriteIdsIndex(string fileName, IEnumerable <BlobIdsInfo> infos)
{
using (var nodesStream = File.Open(fileName, FileMode.Create))
{
var writer = new BinaryWriter(nodesStream, Encoding.Unicode, true);
foreach (var info in infos)
{
BlobIdsInfo.WriteBlobInfo(writer, info);
}
}
}
public static BlobIdsInfo ReadBlobIdsInfo(BinaryReader reader)
{
var info = new BlobIdsInfo
{
StartPosition = reader.ReadInt64(),
NodesCount = reader.ReadInt32(),
MinNodeId = reader.ReadInt64(),
MaxNodeId = reader.ReadInt64(),
WaysCount = reader.ReadInt32(),
RelationsCount = reader.ReadInt32()
};
return(info);
}
public static async Task Process(string fileName, string indexFileName)
{
var index = BlobIdsInfo.ReadIdsIndex(indexFileName).ToList();
Console.WriteLine($"Index size: {index.Count}");
using (var stream = File.OpenRead(fileName))
{
foreach (var info in index.Where(x => x.WaysCount > 0).Take(5))
{
stream.Position = 0;
var parser = new PbfBlobParser(stream);
parser.SkipBlob((ulong)(info.StartPosition - 4));
var header = await parser.ReadBlobHeader();
var blob = await parser.ReadBlobAsync(header);
var primitiveReader = PbfPrimitiveReader.Create(blob);
var data = primitiveReader.ReadData();
var ways = PrimitiveDecoder.DecodeWays(data).ToList();
Console.WriteLine();
foreach (var way in ways)
{
var nodeIds = way.NodeIds.Distinct().OrderBy(x => x).ToList();
var blobsToRead = FindBlobIdsToRead(index, nodeIds);
Console.WriteLine($"Id: {way.Id}, Cnt: {blobsToRead.Count}. {string.Join(", ",blobsToRead)}");
}
}
}
Console.WriteLine("Done! Press any key....");
Console.ReadKey();
}