Class: MsgExtractor::Mapi::NamedPropertyMap

Inherits:
Object
  • Object
show all
Defined in:
lib/msg_extractor/mapi/named_property_map.rb

Overview

Parses the __nameid_version1.0 storage: maps (property-set GUID, numeric LID or string name) pairs to the 0x8000+ property ids used in this file.

Constant Summary collapse

PS_MAPI = 
"00020328-0000-0000-c000-000000000046"
PS_PUBLIC_STRINGS = 
"00020329-0000-0000-c000-000000000046"

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(map) ⇒ NamedPropertyMap

Returns a new instance of NamedPropertyMap.



64
65
66
 
# File 'lib/msg_extractor/mapi/named_property_map.rb', line 64

def initialize(map)
  @map = map
end

Class Method Details

.format_guid(bytes) ⇒ Object 



57
58
59
60
61
62
 
# File 'lib/msg_extractor/mapi/named_property_map.rb', line 57

def self.format_guid(bytes)
  return "00000000-0000-0000-0000-000000000000" if bytes.nil? || bytes.bytesize < 16
  d1, d2, d3 = bytes.unpack("Vvv")
  format("%08x-%04x-%04x-%s-%s", d1, d2, d3,
         bytes.byteslice(8, 2).unpack1("H4"), bytes.byteslice(10, 6).unpack1("H12"))
end

.parse(guid_stream, entry_stream, string_stream) ⇒ Object 



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
 
# File 'lib/msg_extractor/mapi/named_property_map.rb', line 25

def self.parse(guid_stream, entry_stream, string_stream)
  map = {}
  (entry_stream.bytesize / 8).times do |i|
    name_id, info, prop_index = entry_stream.byteslice(i * 8, 8).unpack("Vvv")
    guid_index = info >> 1
    guid =
      case guid_index
      when 1 then PS_MAPI
      when 2 then PS_PUBLIC_STRINGS
      else
        if guid_index >= 3
          format_guid(guid_stream.byteslice((guid_index - 3) * 16, 16))
        else
          "00000000-0000-0000-0000-000000000000"
        end
      end
    key =
      if (info & 1) == 1
        length = string_stream.byteslice(name_id, 4)&.unpack1("V")
        next if length.nil?
        raw = string_stream.byteslice(name_id + 4, length) || "".b
        raw.force_encoding(Encoding::UTF_16LE)
           .encode(Encoding::UTF_8, invalid: :replace, undef: :replace)
           .downcase
      else
        name_id
      end
    map[[guid, key]] = 0x8000 + prop_index
  end
  new(map)
end

.read(cfbf, storage) ⇒ Object 



9
10
11
12
13
14
15
16
17
 
# File 'lib/msg_extractor/mapi/named_property_map.rb', line 9

def self.read(cfbf, storage)
  nameid = storage.children["__NAMEID_VERSION1.0"]
  return new({}) unless nameid&.storage?

  guid_stream = read_child(cfbf, nameid, "__SUBSTG1.0_00020102")
  entry_stream = read_child(cfbf, nameid, "__SUBSTG1.0_00030102")
  string_stream = read_child(cfbf, nameid, "__SUBSTG1.0_00040102")
  parse(guid_stream, entry_stream, string_stream)
end

Instance Method Details

#resolve(guid, name_or_lid) ⇒ Object 



68
69
70
71
 
# File 'lib/msg_extractor/mapi/named_property_map.rb', line 68

def resolve(guid, name_or_lid)
  key = name_or_lid.is_a?(::String) ? name_or_lid.downcase : name_or_lid
  @map[[guid.downcase, key]]
end