Class: G64

Inherits:
D64 show all
Defined in:
lib/image_formats/G64.rb

Constant Summary collapse

CBM_GCR_CODES =

raw GCR binary representation of a 1541 diskette

References: 

http://www.unusedino.de/ec64/technical/formats/g64.html
http://www.baltissen.org/newhtm/1541c.htm
http://www.scribd.com/doc/40438/The-Commodore-1541-Disk-Drive-Users-Guide

{
	"01010"=>0x00,
	"01011"=>0x01,
	"10010"=>0x02,
	"10011"=>0x03,
	"01110"=>0x04,
	"01111"=>0x05,
	"10110"=>0x06,
	"10111"=>0x07,
	"01001"=>0x08,
	"11001"=>0x09,
	"11010"=>0x0A,
	"11011"=>0x0B,
	"01101"=>0x0C,
	"11101"=>0x0D,
	"11110"=>0x0E,
	"10101"=>0x0F
}

Constants inherited from D64

D64::D64_BYTES_PER_SECTOR

Instance Attribute Summary

Attributes inherited from ImageFormat

#file_bytes

Class Method Summary collapse

Instance Method Summary collapse

Methods inherited from D64

#dir_sector_no, #dir_track_no, host_system, #sectors_in_track, #set_sector

Methods inherited from ImageFormat

all_image_formats, all_possible_extensions, code_for_tests, #compatability_score, host_system, #host_system, is_valid_image_if, possible_file_systems, #sectors_in_track, #start_track, #to_s, #track_list

Methods included from SubclassTracking

extended

Constructor Details

#initialize(file_bytes) ⇒ G64

Returns a new instance of G64.



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# File 'lib/image_formats/G64.rb', line 45

def initialize(file_bytes)
  @file_bytes=file_bytes
  @tracks={}
  @end_track=0
  signature,version,raw_track_count,track_length=file_bytes.unpack("A8ccv")
  
  0.upto(raw_track_count-1) do |raw_track_no|
	cbm_track_no=(raw_track_no+2.0)/2
	track_offset=file_bytes[0x0c+4*raw_track_no,4].unpack("V")[0]
	if track_offset>0 then
		@end_track=cbm_track_no
	end
end

end

Class Method Details

.possible_extensions ⇒ Object 



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# File 'lib/image_formats/G64.rb', line 60

def self.possible_extensions
    ['.g64']
end

Instance Method Details

#end_track ⇒ Object 



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# File 'lib/image_formats/G64.rb', line 68

def end_track
  @end_track
end

#get_sector(track_no, sector_no) ⇒ Object 



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# File 'lib/image_formats/G64.rb', line 72

def get_sector(track_no,sector_no)
#puts "TR #{track_no} : #{sector_no}"
parse_raw_track((track_no-1)*2) if @tracks[track_no].nil?
@tracks[track_no][sector_no]
  
end

#track_count ⇒ Object 



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# File 'lib/image_formats/G64.rb', line 64

def track_count
  @end_track
end