Clash Royale CLAN TAG#URR8PPP

Protocol message contained an invalid tag (zero)

I'm working with pbf files from the open street maps

I want to parse node, relations, and ways.

when I try to parse nodes I get that message.

The code looks like

package myCode;

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.util.List;

import protpbufCode.OsmPbf;
import protpbufCode.OsmPbf.Node;
import protpbufCode.OsmPbf.PrimitiveGroup;


public class ReadingPBF


public static void print(PrimitiveGroup node)

for (Node m: node.getNodesList())

System.out.print("Person ID: " + m.getId() + " ");
System.out.print(" Lat: " + m.getLat()+ " ");
System.out.print(" Long: "+ m.getLon()+ " ");
System.out.println("");





public static void main (String args)

try

PrimitiveGroup newNode = PrimitiveGroup.parseFrom(new FileInputStream(new File("isle.pbf")));
print(newNode);

catch (IOException e)

// TODO Auto-generated catch block
e.printStackTrace();
System.out.println(e.getMessage());
System.out.println(e.getCause());








the OsmPbf is java class that created using the protobuf compiler.

and that what gets printed.

com.google.protobuf.InvalidProtocolBufferException: Protocol message contained an invalid tag (zero).
at com.google.protobuf.InvalidProtocolBufferException.invalidTag(InvalidProtocolBufferException.java:89)
at com.google.protobuf.CodedInputStream.readTag(CodedInputStream.java:158)
at protpbufCode.OsmPbf$PrimitiveGroup.<init>(OsmPbf.java:5230)
at protpbufCode.OsmPbf$PrimitiveGroup.<init>(OsmPbf.java:5219)
at protpbufCode.OsmPbf$PrimitiveGroup$1.parsePartialFrom(OsmPbf.java:5329)
at protpbufCode.OsmPbf$PrimitiveGroup$1.parsePartialFrom(OsmPbf.java:1)
at com.google.protobuf.AbstractParser.parsePartialFrom(AbstractParser.java:192)
at com.google.protobuf.AbstractParser.parseFrom(AbstractParser.java:209)
at com.google.protobuf.AbstractParser.parseFrom(AbstractParser.java:215)
at com.google.protobuf.AbstractParser.parseFrom(AbstractParser.java:49)
at protpbufCode.OsmPbf$PrimitiveGroup.parseFrom(OsmPbf.java:5627)
at myCode.ReadingPBF.main(ReadingPBF.java:33)


Protocol message contained an invalid tag (zero).

null


Did you check if the PBF file is broken? Can it be read with other tools, like osmosis?
– scai
Oct 28 '14 at 8:01

yes i checked , it is not broken.
– Moe
Oct 28 '14 at 13:23

1 Answer
1

OpenStreetMap .pbf files are not simple protobufs. See the documentation here:

http://wiki.openstreetmap.org/wiki/PBF_Format

Under the section "File format", you'll see this:

The format is a repeating sequence of:

That is, the file starts out with a 4-byte integer before the first protobuf message. Since this integer is probably smaller than 2^24, the first byte will of course be zero, which explains the exact exception you are seeing.

You will need to read this 4-byte value manually, then make sure to read only that many bytes and parse them as a BlobHeader, and so on.

BlobHeader

Personally I'd recommend looking for a PBF decoder library that already handles this for you. There must be a few out there.

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