Here are the data structures with brief descriptions:

Ccheck
Cdi_hash_node	Node of a hash table
Cdi_hash_table	Hash table
Cdi_list	Double-linked list
Cdi_list_node	Node of a double-linked list
Cdi_log_handler_struct	Log handler info
Cdi_mem_area	Mem area
Cdi_mem_chunk	Mem chunk
Cdi_package	Package
Cdi_package_dependency	Package dependency
Cdi_package_version	Package version
Cdi_packages	Packages file
Cdi_packages_allocator	Packages file - Allocator
Cdi_packages_resolve_dependencies_check
Cdi_packages_resolve_dependencies_do_real_list_append_data
Cdi_parser_fieldinfo	Info about a parser field
Cdi_parser_info	Parse info
Cdi_release	Release file
Cdi_release_file	Release file - file entry
Cdi_rstring	Raw string
Cdi_slist	Single-linked list
Cdi_slist_node	Node of a single-linked list
Cdi_system_package	Package - System
Cdi_tree	Tree
Cdi_tree_node	Node of a tree
Cdmi_header
Chwmap_type
Cinternal_di_package_parser_data
Cmap