Module: NTFS

Extended by:
DL::Importable
Defined in:
sample/stream.rb

Constant Summary collapse

OPEN_EXISTING = 
3
GENERIC_READ = 
0x80000000
BACKUP_DATA = 
0x00000001
BACKUP_ALTERNATE_DATA = 
0x00000004
FILE_SHARE_READ = 
0x00000001
FILE_FLAG_BACKUP_SEMANTICS = 
0x02000000

Constants included from DL::Importable

DL::Importable::LIB_MAP

Instance Method Summary collapse

Methods included from DL::Importable::Internal

#[], #_args_, #_retval_, #callback, #define_struct, #define_union, #dlload, #encode_argument_types, #extern, #import, #init_sym, #init_types, #parse_cproto, #symbol, #typealias

Instance Method Details

#streams(filename) ⇒ Object 



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# File 'sample/stream.rb', line 29

def streams(filename)
  status = []
  h = createFile(filename,GENERIC_READ,FILE_SHARE_READ,nil,
   OPEN_EXISTING,FILE_FLAG_BACKUP_SEMANTICS,0)
  if( h != 0 )
    begin
	# allocate the memory for backup data used in backupRead().
	data = DL.malloc(DL.sizeof("L5"))
	data.struct!("LLLLL", :id, :attrs, :size_low, :size_high, :name_size)

	# allocate memories for references to long values used in backupRead().
	context = DL.malloc(DL.sizeof("L"))
	lval = DL.malloc(DL.sizeof("L"))

	while( backupRead(h, data, data.size, lval, false, false, context) )
 size = data[:size_low] + (data[:size_high] << (DL.sizeof("I") * 8))
 case data[:id]
 when BACKUP_ALTERNATE_DATA
   stream_name = DL.malloc(data[:name_size])
   backupRead(h, stream_name, stream_name.size,
       lval, false, false, context)
   name = stream_name[0, stream_name.size]
   name.tr!("\000","")
   if( name =~ /^:(.*?):.*$/ )
     status.push([$1,size])
   end
 when BACKUP_DATA
   status.push([nil,size])
 else
   raise(RuntimeError, "unknown data type #{data[:id]}.")
 end
 l1 = DL.malloc(DL.sizeof("L"))
 l2 = DL.malloc(DL.sizeof("L"))
 if( !backupSeek(h, data[:size_low], data[:size_high], l1, l2, context) )
   break
 end
	end
    ensure
	backupRead(h, nil, 0, lval, true, false, context)
	closeHandle(h)
    end
    return status
  else
    raise(RuntimeError, "can't open #{filename}.\n")
  end
end