[Tile-serving] [osm2pgsql-dev/osm2pgsql] Check flat node file format for forwards compatibility (PR #2279)

[Jochen Topf]

In a flat node file the first location is that of node id 0, which does not exist. So the first location must always be the undefined location, otherwise we might be looking at a different kind of file.

This adds a check for forwards compatibility. If and when we change the file format, we can use the first 8 bytes to differentiate the file formats.
You can view, comment on, or merge this pull request online at:

  https://github.com/osm2pgsql-dev/osm2pgsql/pull/2279

-- Commit Summary --

  * Check flat node file format for forwards compatibility

-- File Changes --

    M src/node-persistent-cache.cpp (9)

-- Patch Links --

https://github.com/osm2pgsql-dev/osm2pgsql/pull/2279.patch
https://github.com/osm2pgsql-dev/osm2pgsql/pull/2279.diff

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