Here are the data structures with brief descriptions:

Cguac_audio_encoder	Arbitrary audio codec encoder
Cguac_audio_stream	Basic audio stream
Cguac_client	Guacamole proxy client
Cguac_display_layer_cairo_context	The current Cairo drawing context of a guac_display_layer, including a Cairo image surface wrapping the underlying drawing buffer of the guac_display_layer
Cguac_display_layer_raw_context	The current raw drawing context of a guac_display_layer, including the underlying drawing buffer of the guac_display_layer and memory layout information
Cguac_fifo	Generic base structure for a FIFO of arbitrary events
Cguac_flag	Generic integer flag intended for signalling of arbitrary events between processes
Cguac_layer	Represents a single layer within the Guacamole protocol
Cguac_object	Represents a single object within the Guacamole protocol
Cguac_parser	A Guacamole protocol parser, which reads individual instructions, filling its own internal structure with the most recently read instruction data
Cguac_pool	A pool of integers
Cguac_pool_int	Represents a single integer within a larger pool of integers
Cguac_recording	An in-progress session recording, attached to a guac_client instance such that output Guacamole instructions may be dynamically intercepted and written to a file
Cguac_rect	A rectangle defined by its upper-left and lower-right corners
Cguac_rwlock	This file implements reentrant read-write locks using thread-local storage to keep track of how locks are held and released by the current thread, since the pthread locks do not support reentrant behavior
Cguac_socket	The core I/O object of Guacamole
Cguac_socket_ssl_data	SSL socket-specific data
Cguac_stream	Represents a single stream within the Guacamole protocol
Cguac_user	Representation of a physical connection within a larger logical connection which may be shared
Cguac_user_info	Information exposed by the remote client during the connection handshake which can be used by a client plugin