Object

com.acervera.osm4scala.spark

OSMDataFinder

Related Doc: package spark

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object OSMDataFinder

java.io.InputStream enricher class that adds the firstBlockIndex functionality.

The idea is that every BlobHeaders starts with the same pattern. So to be able to find the first BlobHeader in a chunk file, we are looking for that pattern.

Just before every BlobHeader, there is a set of 4 bytes that contains the size of the next BlobHeader, but of course it is not a fixed value like the pattern. It is necessary to keep it in mind to ignore these 4 bytes.

So this is the structure of every block that contains data:

  1. 4 bytes with header size.
  2. 9 bytes with the constant "0x0A, 0x07, OSMData"
  3. Rest of the header.
  4. Blob containing data.
See also

OSM PBF Format documentation

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  1. implicit class InputStreamEnricher extends AnyRef

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  4. val HEADER_SIZE_LENGTH: Int

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    The length of the Int value before the header block, that specify the size of the header block.

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