Method to get keypath, fingerprint and pubkey from a wally_map

[Sjors]

Basically the reverse of wally_psbt_input_add_keypath_item and wally_psbt_output_add_keypath_item.

[jgriffiths]

It might be a while before these are added. For now you will need to manually extract the data - the fingerprint as the first 4 bytes of the value; the remainder of the date is little endian encoded uint32's holding the path.

[Sjors]

That's indeed what I ended up doing, rather tedious, and adding a dependency on internal data structures.

https://github.com/blockchain/libwally-swift/pull/45/commits/eac080bddd1c21a1ba41c2064cbfeb062bfcda8d?file-filters%5B%5D=.md&file-filters%5B%5D=.swift#diff-dd5b685bc72957e5736a7a36ebcea752f6c6e49bd4f5a0792b46e6f4cecb9658R20

[jgriffiths]

I think you need some logic around $0.load(as: UInt32.self) to load as little endian for big endian architectures.