@astrid The trie? In liblzma_la-crc64-fast.o it's at 0xC340 (has_child masks) and 0xAEE0 (node info).
Here is the parser, but so far I've only seen one version of this: https://gist.github.com/Riatre/527a34d2e4e0ed4770353a3cc4a6e136
(Offsets hardcoded here is for https://snapshot.debian.org/archive/debian/20240321T160517Z/pool/main/x/xz-utils/liblzma5_5.6.0-0.2_amd64.deb)