Class: Mumble::PacketDataStream

Inherits:
Object
  • Object
show all
Defined in:
lib/mumble-ruby/packet_data_stream.rb

Instance Method Summary collapse

Constructor Details

#initialize(data = nil) ⇒ PacketDataStream

Returns a new instance of PacketDataStream.



3
4
5
6
7
8
9
 
# File 'lib/mumble-ruby/packet_data_stream.rb', line 3

def initialize(data=nil)
  @data = data || 0.chr * 1024
  @data = @data.split ''
  @pos = 0
  @ok = true
  @capacity = @data.size
end

Instance Method Details

#append(val) ⇒ Object 



23
24
25
26
27
28
29
30
 
# File 'lib/mumble-ruby/packet_data_stream.rb', line 23

def append(val)
  if @pos < @capacity
    @data[@pos] = val.chr
    skip
  else
    @ok = false
  end
end

#append_block(data) ⇒ Object 



32
33
34
35
36
37
38
39
40
 
# File 'lib/mumble-ruby/packet_data_stream.rb', line 32

def append_block(data)
  len = data.size
  if len < left
    @data[@pos, len] = data.split('')
    skip len
  else
    @ok = false
  end
end

#get_block(len) ⇒ Object 



42
43
44
45
46
47
48
49
50
51
 
# File 'lib/mumble-ruby/packet_data_stream.rb', line 42

def get_block(len)
  if len < left
    ret = @data[@pos, len]
    skip len
  else
    @ok = false
    ret = []
  end
  ret
end

#get_int ⇒ Object 



123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
 
# File 'lib/mumble-ruby/packet_data_stream.rb', line 123

def get_int
  v = get_next
  int = 0

  if (v & 0x80) == 0x00
    int = v & 0x7F
  elsif (v & 0xC0) == 0x80
    int = (v & 0x3F) << 8 | get_next
  elsif (v & 0xF0) == 0xF0
    x = v & 0xFC
    if x == 0xF0
      int = get_next << 24 | get_next << 16 | get_next << 8 | get_next
    elsif x == 0xF4
      int = get_next << 56 | get_next << 48 | get_next << 40 | get_next << 32 |
            get_next << 24 | get_next << 16 | get_next << 8  | get_next
    elsif x == 0xF8
      int = get_int
      int = ~int
    elsif x == 0xFC
      int = v & 0x03
      int = ~int
    else
      @ok = false
      int = 0
    end
  elsif (v & 0xF0) == 0xE0
    int = (v & 0x0F) << 24 | get_next << 16 | get_next << 8 | get_next
  elsif (v & 0xE0) == 0xC0
    int = (v & 0x1F) << 16 | get_next << 8 | get_next
  end

  return int
end

#get_next ⇒ Object 



53
54
55
56
57
58
59
60
61
62
 
# File 'lib/mumble-ruby/packet_data_stream.rb', line 53

def get_next
  if @pos < @capacity
    ret = @data[@pos].ord
    skip
  else
    ret = 0
    @ok = false
  end
  ret
end

#left ⇒ Object 



19
20
21
 
# File 'lib/mumble-ruby/packet_data_stream.rb', line 19

def left
  @capacity - @pos
end

#put_int(int) ⇒ Object 



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
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
 
# File 'lib/mumble-ruby/packet_data_stream.rb', line 72

def put_int(int)
  if !(int & 0x8000000000000000).zero? && (~int < 0x100000000)
    int = ~int
    puts int
    if int <= 0x3
      # Shortcase for -1 to -4
      append(0xFC | int)
    else
      append(0xF8)
    end
  end

  if int < 0x80
    # Need top bit clear
    append(int)
  elsif int < 0x4000
    # Need top two bits clear
    append((int >> 8) | 0x80)
    append(int & 0xFF)
  elsif int < 0x200000
    # Need top three bits clear
    append((int >> 16) | 0xC0)
    append((int >> 8) & 0xFF)
    append(int & 0xFF)
  elsif int < 0x10000000
    # Need top four bits clear
    append((int >> 24) | 0xE0)
    append((int >> 16) & 0xFF)
    append((int >> 8) & 0xFF)
    append(int & 0xFF)
  elsif int < 0x100000000
    # It's a full 32-bit integer.
    append(0xF0)
    append((int >> 24) & 0xFF)
    append((int >> 16) & 0xFF)
    append((int >> 8) & 0xFF)
    append(int & 0xFF)
  else
    # It's a 64-bit value.
    append(0xF4)
    append((int >> 56) & 0xFF)
    append((int >> 48) & 0xFF)
    append((int >> 40) & 0xFF)
    append((int >> 32) & 0xFF)
    append((int >> 24) & 0xFF)
    append((int >> 16) & 0xFF)
    append((int >> 8) & 0xFF)
    append(int & 0xFF)
  end
end

#rewind ⇒ Object 



64
65
66
 
# File 'lib/mumble-ruby/packet_data_stream.rb', line 64

def rewind
  @pos = 0
end

#size ⇒ Object 



15
16
17
 
# File 'lib/mumble-ruby/packet_data_stream.rb', line 15

def size
  @pos
end

#skip(len = 1) ⇒ Object 



68
69
70
 
# File 'lib/mumble-ruby/packet_data_stream.rb', line 68

def skip(len=1)
  len < left ? @pos += len : @ok = false
end

#valid ⇒ Object 



11
12
13
 
# File 'lib/mumble-ruby/packet_data_stream.rb', line 11

def valid
  @ok
end