Class: AcornDsk

Inherits:
ImageFormat show all
Defined in:
lib/image_formats/AcornDsk.rb

Overview

Acorn 8-bit series disk image

Instance Attribute Summary

Attributes inherited from ImageFormat

#file_bytes

Class Method Summary collapse

Instance Method Summary collapse

Methods inherited from ImageFormat

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

Methods included from SubclassTracking

extended

Constructor Details

#initialize(file_bytes) ⇒ AcornDsk

Returns a new instance of AcornDsk.



17
18
19
20
21
22
 
# File 'lib/image_formats/AcornDsk.rb', line 17

def initialize(file_bytes)
  @file_bytes=file_bytes
  @sector_length=256
  @sectors_per_track=10
  @track_count=file_bytes.length/(@sectors_per_track*@sector_length)
end

Class Method Details

.host_system ⇒ Object 



24
25
26
 
# File 'lib/image_formats/AcornDsk.rb', line 24

def self.host_system
    AcornBBC
end

.possible_extensions ⇒ Object 



13
14
15
 
# File 'lib/image_formats/AcornDsk.rb', line 13

def self.possible_extensions
    ['.ssd','.bbc']
end

Instance Method Details

#get_sector(track, sector) ⇒ Object 



37
38
39
40
41
 
# File 'lib/image_formats/AcornDsk.rb', line 37

def get_sector(track,sector)  
  start_byte=track*@sectors_per_track*@sector_length+(sector*@sector_length)
#  puts "Track: #{track}, sector: #{sector}, start_byte: #{start_byte}"
  @file_bytes[start_byte,@sector_length]
end

#sectors_in_track(track_no) ⇒ Object 



28
29
30
 
# File 'lib/image_formats/AcornDsk.rb', line 28

def sectors_in_track(track_no)
  (0..@sectors_per_track).collect
end

#track_count ⇒ Object

how many tracks could be interpreted by this image format?



33
34
35
 
# File 'lib/image_formats/AcornDsk.rb', line 33

def track_count
  @track_count
end