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



57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
# 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



39
40
41
42
43
44
# 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_systemObject



34
35
36
# File 'lib/file_systems/PascalDos.rb', line 34

def self.host_system
  Apple2
end