Class: PascalDisk

Inherits:
DSK
  • Object
show all
Defined in:
lib/PascalDisk.rb

Constant Summary

Constants inherited from DSK

DSK::DSK_FILE_LENGTH, DSK::DSK_IMAGE_EXTENSIONS, DSK::FILE_SYSTEMS, DSK::INTERLEAVES, DSK::NIB_FILE_LENGTH, DSK::SECTOR_ORDERS

Instance Attribute Summary collapse

Attributes inherited from DSK

#file_bytes, #sector_order, #source_filename, #track_count

Instance Method Summary collapse

Methods inherited from DSK

#add_file, #best_subclass, create_new, #delete_file, #disassemble_sector, #dump_sector, #files, #free_sector_list, #get_block, #get_sector, #hex_dump, #is_cpm?, #is_dos33?, is_dsk_file?, #is_modified_dos?, #is_nadol?, #is_pascal?, #is_prodos?, #make_file, read, #save_as, #set_boot_track, #set_sector

Constructor Details

#initialize(file_bytes, sector_order) ⇒ PascalDisk

Returns a new instance of PascalDisk.



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# File 'lib/PascalDisk.rb', line 42

def initialize(file_bytes,sector_order)    
	super(file_bytes,sector_order)
	self.read_catalog
end

Instance Attribute Details

#volume_name ⇒ Object

Returns the value of attribute volume_name.



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# File 'lib/PascalDisk.rb', line 30

def volume_name
  @volume_name
end

Instance Method Details

#dump_catalog ⇒ Object 



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# File 'lib/PascalDisk.rb', line 32

def dump_catalog
	s=""
	files.keys.sort.each { |file_name|		
		file=files[file_name]	
		s<< "#{sprintf('% 6d',file.contents.length)}\t #{file.file_type}\t#{file.filename}\n"
	}
	s
end

#file_system ⇒ Object 



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# File 'lib/PascalDisk.rb', line 47

def file_system
	:pascal
end

#read_catalog ⇒ Object

reads the catalog, and populate the “files” array with files



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# File 'lib/PascalDisk.rb', line 52

def read_catalog
       catalog=get_block(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(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]
       self.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(block_no)
           if block_no==last_block then
             file_contents<<this_block[0..bytes_in_last_block-1]
           else
             file_contents<<this_block 
           end
         files[file_name]=PascalFile.new(file_name,file_contents,file_type)
       end        
     end
end