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
|
# frozen_string_literal: true
module TTFunk
# Helper methods to read form file content.
# @api rpivate
module Reader
private
def io
@file.contents
end
def read(bytes, format)
io.read(bytes).unpack(format)
end
def read_signed(count)
read(count * 2, 'n*').map { |i| to_signed(i) }
end
def to_signed(number)
number >= 0x8000 ? -((number ^ 0xFFFF) + 1) : number
end
def parse_from(position)
saved = io.pos
io.pos = position
result = yield(position)
io.pos = saved
result
end
# For debugging purposes
def hexdump(string)
bytes = string.unpack('C*')
bytes.each_with_index do |c, i|
printf('%02X', c)
if ((i + 1) % 16).zero?
puts
elsif ((i + 1) % 8).zero?
print(' ')
else
print(' ')
end
end
puts if (bytes.length % 16) != 0
end
end
end
|
