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data_transfer reads only through its reader callback. The path entry points keep their names, data_transfer_open_prefix and data_transfer_open_window, in streams/data_transfer_file.c (<streams/data_transfer_file.h>), which opens the file through filestream, reads it at offsets and closes it with the transfer; data_transfer_open_prefix_reader and data_transfer_set_release are the core's side of that. cdfs reads only through the stream a track holds. cdfs_open_track, cdfs_open_data_track and cdfs_open_raw_track are in streams/cdfs_file.c (<streams/cdfs_file.h>); the length-based sector probe they use is cdfs_track_sector_size_from_length. rdvd_vfs, which binds files to the DVD source, and rdvd_stream, which drives it, are streams/rdvd_vfs.c and streams/rdvd_stream.c, their headers under <streams/>. cdfs_file_test covers the path openers: a cooked iso and a raw bin sized by length, a cue sheet resolving its bin beside it, an INDEX 01 offset, the data track, refusals.