Method: CHD::CD.read_toc

Defined in:
lib/chd/cd.rb

.read_toc(chd) ⇒ Array<Hash{Symbol => Object}>?

Read the TOC, and returns it’s information in a parsed form.

Parameters:

  • chd (CHD) —

    a chd opened file

Returns:

  • (Array<Hash{Symbol => Object}>) —

    Table of Content

  • (nil) —

    if the CHD file is not of a CD-ROM / GD-ROM type



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# File 'lib/chd/cd.rb', line 59

def self.read_toc(chd)
    return nil if chd.hunk_bytes %  FRAME_SIZE != 0 ||
                  chd.unit_bytes != FRAME_SIZE
    
    flags  = Set.new
    tracks = []
    while (idx = tracks.size) < MAX_TRACKS do
 if    md = chd.get_metadata(idx, Metadata::CDROM_TRACK,      )
 elsif md = chd.get_metadata(idx, Metadata::CDROM_TRACK_PREGAP)
 elsif md = chd.get_metadata(idx, Metadata::GDROM_OLD,        )
            raise NotSupported, "upgrade your CHD to a more recent version"
 elsif md = chd.get_metadata(idx, Metadata::GDROM_TRACK,      )
            flags << :GDROM
 else
     break            
 end
        tracks << Metadata.parse(*md)
    end
    
    if ! tracks.empty?
        unless tracks.each_with_index.all? {|trackinfo, index|
                   trackinfo[:track] == index + 1
               }
            raise ParsingError, "unordered tracks"
        end
        [ tracks, flags ]
    elsif chd.get_metadata(0, Metadata::CDROM_OLD)
        raise NotSupported, "upgrade your CHD to a more recent version"
    else
        raise NotFoundError, "provided CHD is not a CD-ROM"
    end
end