Here are the data structures with brief descriptions:

Clzma_allocator	Custom functions for memory handling
Clzma_block	Options for the Block and Block Header encoders and decoders
Clzma_filter	Filter options
Clzma_index_iter	Iterator to get information about Blocks and Streams
Clzma_mt	Multithreading options
Clzma_options_bcj	Options for BCJ filters
Clzma_options_delta	Options for the Delta filter
Clzma_options_lzma	Options specific to the LZMA1 and LZMA2 filters
Clzma_stream	Passing data to and from liblzma
Clzma_stream_flags	Options for encoding/decoding Stream Header and Stream Footer