Class: Array

Inherits:
Object
  • Object
show all
Defined in:
lib/java_dissassembler/array.rb

Instance Method Summary collapse

Instance Method Details

#modified_utf8_to_s ⇒ Object 



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# File 'lib/java_dissassembler/array.rb', line 10

def modified_utf8_to_s
  new_str = ""
  bytes = self
  until bytes.empty?
    # Code points in the range '\u0001' to '\u007F' are represented by a single byte
    if (bytes[0] >> 7) == 0
      new_str << bytes[0]
      bytes.shift
    # The null code point ('\u0000') and code points in the range '\u0080' to '\u07FF' are represented by a pair of bytes x and y
    elsif (bytes[0] >> 5) == 0b110
      new_str << [((bytes[0] & 0x1f) << 6) + (bytes[1] & 0x3f)].pack("U")
      bytes.shift(2)
    # Code points in the range '\u0800' to '\uFFFF' are represented by 3 bytes
    elsif ((bytes[0] >> 4) == 0b1110) && (bytes[0] != 0b11101101)
      new_str << [((bytes[0] & 0xf) << 12) + ((bytes[1] & 0x3f) << 6) + (bytes[2] & 0x3f)].pack("U")
      bytes.shift(3)
    # Characters with code points above U+FFFF (so-called supplementary characters) are represented by separately encoding the
    # two surrogate code units of their UTF-16 representation
    elsif (bytes[0] == 0b11101101) && (bytes[3] == 0b11101101)
      new_str << [0x10000 + ((bytes[1] & 0x0f) << 16) + ((bytes[2] & 0x3f) << 10) + ((bytes[4] & 0x0f) << 6) + (bytes[5] & 0x3f)].pack("U")
      bytes.shift(6)
    else
      raise "Invalid \"Modified\" UTF-8 byte `#{bytes[0]}'"
    end
  end
  new_str
end

#u2 ⇒ Object 



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# File 'lib/java_dissassembler/array.rb', line 2

def u2
  self.pack("C*").unpack("s>").first
end

#u4 ⇒ Object 



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# File 'lib/java_dissassembler/array.rb', line 6

def u4
  self.pack("C*").unpack("N").first
end