Class: Packcr::Buffer

Inherits:
Object
  • Object
show all
Defined in:
lib/packcr/buffer.rb

Instance Method Summary collapse

Constructor Details

#initialize ⇒ Buffer

Returns a new instance of Buffer.



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# File 'lib/packcr/buffer.rb', line 4

def initialize
  @buf = +"".b
end

Instance Method Details

#[](index) ⇒ Object 



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# File 'lib/packcr/buffer.rb', line 12

def [](index)
  @buf[index].ord
end

#[]=(pos, ch) ⇒ Object 



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# File 'lib/packcr/buffer.rb', line 39

def []=(pos, ch)
  @buf[pos] = ch
end

#add(ch) ⇒ Object 



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# File 'lib/packcr/buffer.rb', line 31

def add(ch)
  @buf.concat(ch)
end

#add_pos(offset) ⇒ Object 



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# File 'lib/packcr/buffer.rb', line 43

def add_pos(offset)
  @buf[0, offset] = ""
end

#count_characters(s, e) ⇒ Object 



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# File 'lib/packcr/buffer.rb', line 16

def count_characters(s, e)
  # UTF-8 multibyte character support but without checking UTF-8 validity
  n = 0
  i = s
  while i < e
    c = self[i]
    if c == 0
      break
    end
    n += 1
    i += (c < 0x80) ? 1 : ((c & 0xe0) == 0xc0) ? 2 : ((c & 0xf0) == 0xe0) ? 3 : ((c & 0xf8) == 0xf0) ? 4 : 1
  end
  return n
end

#len ⇒ Object 



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# File 'lib/packcr/buffer.rb', line 8

def len
  @buf.length
end

#to_s ⇒ Object 



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# File 'lib/packcr/buffer.rb', line 35

def to_s
  @buf
end