Class: AcornDFS

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

Overview

beebwiki.jonripley.com/Acorn_DFS_disc_format

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

.files(file_system_image) ⇒ Object 



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# File 'lib/file_systems/AcornDFS.rb', line 29

def self.files(file_system_image)
	files=FileContainer.new
	
	sector_0=file_system_image.get_sector(0,0)
	sector_1=file_system_image.get_sector(0,1)
	volume_name=sector_1[0..3]+sector_0[0..7]+" (#{"%02x" % sector_1[4].to_i})"
	file_system_image.volume_name=volume_name.tr("\000",".")
	file_count=sector_1[5] / 8
	file_count.times do |i|
entry_start=(i+1)*8
filename="#{sector_0[entry_start+7,1]}.#{sector_0[entry_start,7]}".strip
entry=sector_1[entry_start,8]
load_address=entry[0]+(entry[1]<<8)+(0x55*((entry[6]>>2)%4)<<16)
exec_address=entry[2]+(entry[3]<<8)+(0x55*((entry[6]>>6)%4)<<16)
length=entry[4]+(entry[5]<<8)+(((entry[6]>>4)%4)<<16)
start_sector=((entry[6]% 4)<<8)+entry[7]
#		puts "%x %x %x %x #{filename}" % [load_address,exec_address,length,start_sector]
raw_bytes=""
((length+255)/0x100).times do |i|
	track = (start_sector+i)/10
	sector= (start_sector+i) % 10
	raw_bytes<<file_system_image.get_sector(track,sector)
end
file_contents=raw_bytes[0,length]
file=NativeFileType.best_fit(file_system_image,filename,file_contents,nil,load_address)
file.execute_address=exec_address
files<<file
	end
	files
end

.host_system ⇒ Object 



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# File 'lib/file_systems/AcornDFS.rb', line 13

def self.host_system
  AcornBBC
end