SVN: translation between path and node ids?

I have some build info used to identify at runtime the Subversion version # and the URL of the source directory within the repository.

Does SVN use a开发者_Go百科ny kind of node ID to identify paths? I'm using an embedded system with a communications link that does not deal well with large data fields, and would be much happier using a 32- or 64-bit node ID, than a long string that does not have a fixed length.

If it does use a node ID, what utility is available to translate between paths and node IDs?

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Why not use SHA1 hash like git?