public Pmtiles.JsonMetadata getJsonMetadata() throws IOException {
    var buf = getBytes(header.jsonMetadataOffset(), (int) header.jsonMetadataLength());
    if (header.internalCompression() == Pmtiles.Compression.GZIP) {
      buf = Gzip.gunzip(buf);
    }
    return Pmtiles.JsonMetadata.fromBytes(buf);
  }
Finds the relevant entry for a tileId in a list of entries.
<p>
If there is an exact match for tileId, return that. Else if the tileId matches an entry's tileId + runLength,
return that. Else if the preceding entry is a directory (runLength = 0), return that. Else return null.
planetiler-core/src/main/java/com/onthegomap/planetiler/pmtiles/ReadablePmtiles.java