Here are the classes, structs, unions and interfaces with brief descriptions:

CCOMPLEX
Cdata_history
Cdsr
Cfield_s
CFSLIO	High level data structure for open datasets in the fslio API
Cheader_key
Cimage_dimension
Cint_list
Cmat33
Cmat44
Cnifti1_extender	This structure represents a 4-byte string that should follow the binary nifti_1_header data in a NIFTI-1 header file. If the char values are {1,0,0,0}, the file is expected to contain extensions, values of {0,0,0,0} imply the file does not contain extensions. Other sequences of values are not currently defined
Cnifti1_extension	Data structure defining the fields of a header extension
Cnifti_1_header	Data structure defining the fields in the nifti1 header. This binary header should be found at the beginning of a valid NIFTI-1 header file
Cnifti_analyze75
Cnifti_brick_list
Cnifti_global_options
Cnifti_image	High level data structure for open nifti datasets in the nifti1_io API. Note that this structure is not part of the nifti1 format definition; it is used to implement one API for reading/writing formats in the nifti1 format
Cnifti_type_ele
Cnt_opts
Cstr_list
Cznzptr