Class: SlowFat::BiosParameterBlock

Inherits:
Object
  • Object
show all
Defined in:
lib/slowfat/bootsect.rb

Overview

BiosParameterBlock holds information from a BPB.

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(data) ⇒ BiosParameterBlock

Returns a new instance of BiosParameterBlock.



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# File 'lib/slowfat/bootsect.rb', line 41

def initialize(data)
  (@bytes_per_logsect, @logsects_per_cluster, @reserved_logsects, @fats, @root_entries, @total_logsects, @media_descriptor, @logsects_per_fat, @physects_per_track, @heads, @hidden_logsects, @large_total_logsects) = data.unpack('vCvCvvCvvvVV')
end

Instance Attribute Details

#bytes_per_logsect ⇒ Object (readonly)

Returns the value of attribute bytes_per_logsect.



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# File 'lib/slowfat/bootsect.rb', line 39

def bytes_per_logsect
  @bytes_per_logsect
end

#fats ⇒ Object (readonly)

Returns the value of attribute fats.



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# File 'lib/slowfat/bootsect.rb', line 39

def fats
  @fats
end

#heads ⇒ Object (readonly)

Returns the value of attribute heads.



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# File 'lib/slowfat/bootsect.rb', line 39

def heads
  @heads
end

#hidden_logsects ⇒ Object (readonly)

Returns the value of attribute hidden_logsects.



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# File 'lib/slowfat/bootsect.rb', line 39

def hidden_logsects
  @hidden_logsects
end

#large_total_logsects ⇒ Object (readonly)

Returns the value of attribute large_total_logsects.



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# File 'lib/slowfat/bootsect.rb', line 39

def large_total_logsects
  @large_total_logsects
end

#logsects ⇒ Object (readonly)

Returns the value of attribute logsects.



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# File 'lib/slowfat/bootsect.rb', line 39

def logsects
  @logsects
end

#logsects_per_cluster ⇒ Object (readonly)

Returns the value of attribute logsects_per_cluster.



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# File 'lib/slowfat/bootsect.rb', line 39

def logsects_per_cluster
  @logsects_per_cluster
end

#logsects_per_fat ⇒ Object (readonly)

Returns the value of attribute logsects_per_fat.



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# File 'lib/slowfat/bootsect.rb', line 39

def logsects_per_fat
  @logsects_per_fat
end

#media_descriptor ⇒ Object (readonly)

Returns the value of attribute media_descriptor.



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# File 'lib/slowfat/bootsect.rb', line 39

def media_descriptor
  @media_descriptor
end

#physects_per_track ⇒ Object (readonly)

Returns the value of attribute physects_per_track.



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# File 'lib/slowfat/bootsect.rb', line 39

def physects_per_track
  @physects_per_track
end

#reserved_logsects ⇒ Object (readonly)

Returns the value of attribute reserved_logsects.



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# File 'lib/slowfat/bootsect.rb', line 39

def reserved_logsects
  @reserved_logsects
end

#root_entries ⇒ Object (readonly)

Returns the value of attribute root_entries.



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# File 'lib/slowfat/bootsect.rb', line 39

def root_entries
  @root_entries
end

Instance Method Details

#media_descriptor_type ⇒ Symbol

Return the type of media this boot sector is on

Returns:

  • (Symbol) —

    the type of media described by the media descriptor in the boot sector



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# File 'lib/slowfat/bootsect.rb', line 48

def media_descriptor_type
  case @media_descriptor_id
    when 0xE5
      :floppy_8inch
    when 0xF0
      :floppy_35inch_hd
    when 0xF8
      :fixed_disk
    when 0xFD
      :floppy_525inch_ld
    else
      :unknown
  end
end