Here is a list of all files with brief descriptions:

buffering_write.c
buffering_write.h
cachetest.c
cachetest.h
cd-paranoia.c
cdda.h	The top-level interface header for libcdio_cdda. Applications include this for paranoia access
cddap_interface.c
common_interface.c
common_interface.h
drive_exceptions.c
drive_exceptions.h
gap.c
gap.h
getopt.c
getopt.h
getopt1.c
getopt_int.h
header.c
header.h	WAV, AIFF and AIFC header-writing routines
interface.c
isort.c
isort.h
low_interface.h
overlap.c
overlap.h
p_block.c
p_block.h
paranoia.c
paranoia.h	The top-level header for libcdda_paranoia: a device- and OS- independent library for reading CD-DA with error tolerance and repair. Applications include this for paranoia access
report.c
report.h
scan_devices.c
smallft.c
smallft.h
test_interface.c
toc.c
toc.h	Information from a CDROM TOC relevant to CD-DA disks
usage-copy.h
usage.h
utils.c
lib/cdda_interface/utils.h
src/utils.h
include/cdio/paranoia/version.h	A file containing the libcdio-paranoia package version number (10.2+2.0.0) and OS build name
src/version.h