Class: RsDos

Inherits:
FileSystem show all
Defined in:
lib/file_systems/RsDos.rb

Overview

sector 2 contains File Allocation Table.

Constant Summary collapse

FDE_SIZE = 
0x20

Class Method Summary collapse

Methods inherited from FileSystem

all_file_systems, code_for_tests, compatability_score, is_valid_file_system_if, matching_score, non_matching_score

Methods included from SubclassTracking

extended

Class Method Details

.directory_track ⇒ Object

standard RSDOS has directory on track 17



35
36
37
 
# File 'lib/file_systems/RsDos.rb', line 35

def self.directory_track
  0x11
end

.files(file_system_image) ⇒ Object 



73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
 
# File 'lib/file_systems/RsDos.rb', line 73

def self.files(file_system_image)
  files=FileContainer.new
  granule_allocation_table=file_system_image.get_sector(directory_track,2)
  return files if granule_allocation_table.nil?
#  file_system_image.volume_name="RSDOS Disk"
  (file_system_image.sectors_in_track(directory_track)-[1,2,12,13,14,15,16,17,18]).each do |sector_no|
    fde_sector=file_system_image.get_sector(directory_track,sector_no)
    (fde_sector.length/FDE_SIZE).times do |fde_number|
      fde=fde_sector[fde_number*FDE_SIZE,FDE_SIZE]
      next if fde[0]==0
      break if fde[0]==0xff
      
      filename_base=fde[0,8].unpack("A8")
      filename_extension=fde[8,3].unpack("A8")
      filename="#{filename_base}/#{filename_extension}"
      file_type, ascii_flag, granule, last_sector_bytes = fde[11,5].unpack("CCCS")
      contents=""
      granules = []
      
#      puts "#{filename}: first gran:#{granule} file type #{file_type} ascii flag #{ascii_flag}"
      
      while granule < 67
      	break if granules.include?(granule)==true
      	granules << granule
      	track_no = Integer(granule/2)
      	(track_no += 1) if granule>33
      	start_sector = (granule % 2) == 0 ? 1 : 10
      	#puts "Start sector: #{start_sector}"
      	
      	granule_value = granule_allocation_table[ granule ]
      	
      	if granule_value < 68 then
      	  9.times {|i| contents<<file_system_image.get_sector(track_no,start_sector+i)}
      	else
      	  count = (granule_value & 0b00011111) - 1
          count.times {|i| contents<<file_system_image.get_sector(track_no,start_sector+i)}
          contents<<(file_system_image.get_sector(track_no,start_sector+count))[0,last_sector_bytes]
        end
        #puts "#{granule} = #{granule_value}"
        granule = granule_value
      end

      files<<NativeFileType.best_fit(file_system_image,filename,contents,file_type,ascii_flag)      
    end
  end
  files
end

.host_system ⇒ Object 



30
31
32
 
# File 'lib/file_systems/RsDos.rb', line 30

def self.host_system
  Coco
end

.sectors_per_granule(file_system_image) ⇒ Object 



39
40
41
 
# File 'lib/file_systems/RsDos.rb', line 39

def self.sectors_per_granule(file_system_image)
  9
end