$:.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'

#TRS80 DSK in JV1 format - http://tim-mann.org/trs80/dskspec.html
class Trs80Jv1Dsk < ImageFormat
	
def self.possible_extensions
    ['.dsk']
end  

#JV1 format has no header, and a variable number of tracks, each with 10 sectors, each with 256 bytes.
is_valid_image_if lambda {
  (file_system_image.file_bytes.length%2560==0) && (file_system_image.file_bytes.length!=143360)
  
}

def self.host_system
    Trs80
end  
  
def sectors_in_track(track_no)
  (0..0x09).collect
end

# how many tracks could be interpreted by this image format?
def track_count
  file_bytes.length/(2560)
end

def get_sector(track,sector)
  
  #puts "invalid track request for track #{track} / sector #{sector}" unless sectors_in_track(track).include?(sector)
  start_byte=track*10*256+sector*256
  file_bytes[start_byte,256]
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.