Class: PascalDos

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

Overview

19..1A FILE ACCESS DATE

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/PascalDos.rb', line 57

def self.files(file_system_image)
  files=FileContainer.new
  catalog=get_block(file_system_image,2)
  #we've read the first block in the catalog, now read the rest
  catalog_size=catalog[2]
  3.upto(catalog_size-1) do |i|
    catalog<<get_block(file_system_image,i)
  end
#	06	VOLUME NAME LENGTH (1 byte)
#	07..0D	VOLUME NAME (17 bytes)
#	0E..0F 	VOLUME SIZE (WORD)
#	10 	NUMBER OF FILES (BYTE)
  volume_name_length=catalog[6]
  file_system_image.volume_name=catalog[7..6+volume_name_length]
  files_in_volume=catalog[0x10]
  #read in all the files
  
#	00..01 	FIRST BLOCK (word)	
#	02..03 	LAST BLOCK+1 (word)
#	04 	FILE TYPE (byte) =  untypedfile,xdskfile,codefile,textfile,infofile,datafile,graffile,fotofile,securdir
#	05 	STATUS (byte)
#	06	FILENAME LENGTH (1 byte)
#	07..15	FILENAME (15 bytes)
#	16..17 	BYTES IN LAST BLOCK (word)
#	18.1A	FILE ACCESS DATE
  1.upto(files_in_volume) do |file_no|
    file_record=catalog[file_no*0x1a..(file_no*0x1a+0x19)]
    first_block=file_record[0]+file_record[1]*0x100
    first_block_in_next_file=file_record[2]+file_record[3]*0x100
    last_block=first_block_in_next_file-1
    file_type=file_record[4]
    file_name_length=file_record[6]
    file_name=file_record[7..6+file_name_length]
    bytes_in_last_block=file_record[0x16]+file_record[0x17]*0x100
    file_contents=""
    first_block.upto(last_block) do |block_no|
      this_block=get_block(file_system_image,block_no)
      if block_no==last_block then
        file_contents<<this_block[0..bytes_in_last_block-1]
      else
        file_contents<<this_block 
      end
    end
    files<<NativeFileType.best_fit(file_system_image,file_name,file_contents,file_type)
  end        
  files
end

.get_block(file_system_image, block_no) ⇒ Object 



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# File 'lib/file_systems/PascalDos.rb', line 39

def self.get_block(file_system_image,block_no)
	track=(block_no / 8).to_i
	first_sector=2*(block_no % 8)
	raise "illegal block no #{block_no}" if track>=file_system_image.track_count
	return file_system_image.get_sector(track,first_sector)+file_system_image.get_sector(track,first_sector+1)
end

.host_system ⇒ Object 



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# File 'lib/file_systems/PascalDos.rb', line 34

def self.host_system
  Apple2
end