$:.unshift(File.dirname(__FILE__)) unless
	$:.include?(File.dirname(__FILE__)) || $:.include?(File.expand_path(File.dirname(__FILE__)))

$:.unshift(File.dirname(__FILE__+"\\..")) unless
	$:.include?(File.dirname(__FILE__+"\\..")) || $:.include?(File.expand_path(File.dirname(__FILE__+"\\..")))

require 'ImageFormat'

#A2 DSK with "physical" ordering
class A2Dsk < ImageFormat
	
def A2Dsk.possible_extensions
    ['.dsk','.do','.po']
end  

def A2Dsk.host_system
    Apple2
end  
  
#to be overriden in each subclass with a table showing what order logical sectors are stored
def A2Dsk.interleave
  nil
end

def sectors_in_track(track_no)
  (0..0x0f).collect
end

def track_count
  file_bytes.length/4096
end

def get_sector(track,sector)
  return nil if self.class.interleave.nil?
  return nil unless sector.between?(0,0x0F)
  physical_sector=self.class.interleave[sector]
  start_byte=track*16*256+physical_sector*256
  file_bytes[start_byte,256]
end

end

class A2DskPhysicalOrder < A2Dsk
  def A2DskPhysicalOrder.interleave
    [0x00,0x01,0x02,0x03,0x04,0x05,0x06,0x07,0x08,0x09,0x0A,0x0B,0x0C,0x0D,0x0E,0x0F]
  end
end

class A2DskDosOrder < A2Dsk
  def A2DskDosOrder.interleave
    [0x00,0x0E,0x0D,0x0C,0x0B,0x0A,0x09,0x08,0x07,0x06,0x05,0x04,0x03,0x02,0x01,0x0F]
  end
end
# == Author
# Jonno Downes (jonno@jamtronix.com)
#
# == Copyright
# Copyright (c) 2007 Jonno Downes (jonno@jamtronix.com)
#
#Permission is hereby granted, free of charge, to any person obtaining
#a copy of this software and associated documentation files (the
#"Software"), to deal in the Software without restriction, including
#without limitation the rights to use, copy, modify, merge, publish,
#distribute, sublicense, and/or sell copies of the Software, and to
#permit persons to whom the Software is furnished to do so, subject to
#the following conditions:

# The above copyright notice and this permission notice shall be
# included in all copies or substantial portions of the Software.

# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.