1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
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
|
# frozen_string_literal: true
module Zip
# PKWARE NTFS Extra Field (0x000a)
# Only Tag 0x0001 is supported
class ExtraField::NTFS < ExtraField::Generic # :nodoc:
HEADER_ID = [0x000A].pack('v')
register_map
WINDOWS_TICK = 10_000_000.0
SEC_TO_UNIX_EPOCH = 11_644_473_600
def initialize(binstr = nil)
@ctime = nil
@mtime = nil
@atime = nil
binstr && merge(binstr)
end
attr_accessor :atime, :ctime, :mtime
def merge(binstr)
return if binstr.empty?
size, content = initial_parse(binstr)
(size && content) || return
content = content[4..]
tags = parse_tags(content)
tag1 = tags[1]
return unless tag1
ntfs_mtime, ntfs_atime, ntfs_ctime = tag1.unpack('Q<Q<Q<')
ntfs_mtime && @mtime ||= from_ntfs_time(ntfs_mtime)
ntfs_atime && @atime ||= from_ntfs_time(ntfs_atime)
ntfs_ctime && @ctime ||= from_ntfs_time(ntfs_ctime)
end
def ==(other)
@mtime == other.mtime &&
@atime == other.atime &&
@ctime == other.ctime
end
# Info-ZIP note states this extra field is stored at local header
def pack_for_local
pack_for_c_dir
end
# But 7-zip for Windows only stores at central dir
def pack_for_c_dir
# reserved 0 and tag 1
s = [0, 1].pack('Vv')
tag1 = (+'').force_encoding(Encoding::BINARY)
if @mtime
tag1 << [to_ntfs_time(@mtime)].pack('Q<')
if @atime
tag1 << [to_ntfs_time(@atime)].pack('Q<')
tag1 << [to_ntfs_time(@ctime)].pack('Q<') if @ctime
end
end
s << [tag1.bytesize].pack('v') << tag1
s
end
private
def parse_tags(content)
return {} if content.nil?
tags = {}
i = 0
while i < content.bytesize
tag, size = content[i, 4].unpack('vv')
i += 4
break unless tag && size
value = content[i, size]
i += size
tags[tag] = value
end
tags
end
def from_ntfs_time(ntfs_time)
::Zip::DOSTime.at((ntfs_time / WINDOWS_TICK) - SEC_TO_UNIX_EPOCH)
end
def to_ntfs_time(time)
((time.to_f + SEC_TO_UNIX_EPOCH) * WINDOWS_TICK).to_i
end
end
end
|
