Class: Mathtype::FileParser

Inherits:
Object
  • Object
show all
Defined in:
lib/mathtype-0.0.7.5/lib/file_parser/parser.rb

Direct Known Subclasses

EpsFileParser, OleFileParser, WmfFileParser

Constant Summary collapse

A64 = 
{
  "a" => 0, "b" => 1, "c" => 2, "d" => 3, "e" => 4,
  "f" => 5, "g" => 6, "h" => 7, "i" => 8, "j" => 9,
  "k" => 10, "l" => 11, "m" => 12, "n" => 13, "o" => 14, "p" => 15,
  "q" => 16, "r" => 17, "s" => 18, "t" => 19, "u" => 20, "v" => 21,
  "w" => 22, "x" => 23, "y" => 24, "z" => 25, "A" => 26, "B" => 27,
  "C" => 28, "D" => 29, "E" => 30, "F" => 31, "G" => 32, "H" => 33,
  "I" => 34, "J" => 35, "K" => 36, "L" => 37, "M" => 38, "N" => 39,
  "O" => 40, "P" => 41, "Q" => 42, "R" => 43, "S" => 44, "T" => 45,
  "U" => 46, "V" => 47, "W" => 48, "X" => 49, "Y" => 50, "Z" => 51,
  "0" => 52, "1" => 53, "2" => 54, "3" => 55, "4" => 56, "5" => 57,
  "6" => 58, "7" => 59, "8" => 60, "9" => 61, "+" => 62, "-" => 63,
  0 => "a", 1 => "b", 2 => "c", 3 => "d", 4 => "e",
  5 => "f", 6 => "g", 7 => "h", 8 => "i", 9 => "j",
  10 => "k", 11 => "l", 12 => "m", 13 => "n", 14 => "o", 15 => "p",
  16 => "q", 17 => "r", 18 => "s", 19 => "t", 20 => "u", 21 => "v",
  22 => "w", 23 => "x", 24 => "y", 25 => "z", 26 => "A", 27 => "B",
  28 => "C", 29 => "D", 30 => "E", 31 => "F", 32 => "G", 33 => "H",
  34 => "I", 35 => "J", 36 => "K", 37 => "L", 38 => "M", 39 => "N",
  40 => "O", 41 => "P", 42 => "Q", 43 => "R", 44 => "S", 45 => "T",
  46 => "U", 47 => "V", 48 => "W", 49 => "X", 50 => "Y", 51 => "Z",
  52 => "0", 53 => "1", 54 => "2", 55 => "3", 56 => "4", 57 => "5",
  58 => "6", 59 => "7", 60 => "8", 61 => "9", 62 => "+", 63 => "-"
}

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(path) ⇒ FileParser

Returns a new instance of FileParser.



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# File 'lib/mathtype-0.0.7.5/lib/file_parser/parser.rb', line 5

def initialize(path)
  read_from_file(path)
end

Instance Attribute Details

#equation ⇒ Object (readonly)

Returns the value of attribute equation.



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# File 'lib/mathtype-0.0.7.5/lib/file_parser/parser.rb', line 4

def equation
  @equation
end

#raw ⇒ Object (readonly)

Returns the value of attribute raw.



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# File 'lib/mathtype-0.0.7.5/lib/file_parser/parser.rb', line 3

def raw
  @raw
end

Instance Method Details

#checksum ⇒ Object 



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# File 'lib/mathtype-0.0.7.5/lib/file_parser/parser.rb', line 9

def checksum
  (@equation.bytes.reduce(:+) & 0xFFFF).to_s(16).upcase
end

#decode(string64) ⇒ Object 



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# File 'lib/mathtype-0.0.7.5/lib/file_parser/parser.rb', line 45

def decode(string64)
  #decode from base64 mtef to binary mtef
  l = string64.length
  i = b0 = b1 = carry = 0
  out = []
  while i < l
    chr  = A64[string64[i]]
    case i % 4
    when 0
      b0  = chr
      b1 = 0
    when 1
      b0 += ((chr & 3) << 6)
      b1    = ((chr & 0xfc) >> 2)
      out   << b0
    when 2
      b0  = ((chr & 0x30) >> 4)
      b1   += ((chr & 0xf) << 4)
    when 3
      b0 += chr << 2
      out << b1 << b0
      b0=b1=0
    end
    i += 1
  end
  out << b0 if i % 2 == 1
  return out.pack("C*")
end

#encode(mtef) ⇒ Object 



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# File 'lib/mathtype-0.0.7.5/lib/file_parser/parser.rb', line 74

def encode(mtef)
  #encode from binary mtef to base64 mtef
  out = ""
  bytes = mtef.bytes
  i = shft = 0
  l = bytes.length
  carry = 0
  while i < l
    chr = bytes[i] << shft
    chr = chr | carry
    out << A64[chr & 0x3f]
    carry = chr >> 6
    i += 1
    shft = (i % 3) * 2
    if shft == 0
      out << A64[carry]
      carry = 0
    end
  end
  return out
end

#read_from_file(path) ⇒ Object 



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# File 'lib/mathtype-0.0.7.5/lib/file_parser/parser.rb', line 13

def read_from_file(path)
  f = File.open(path, "rb")
  @raw = f.read
  f.close
end