Class: JXL::Bit::Writer

Inherits:
Object
  • Object
show all
Defined in:
lib/jxl/bit/writer.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ Writer

Returns a new instance of Writer.



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# File 'lib/jxl/bit/writer.rb', line 8

def initialize
  @bytes = +"".b
  @buffer = 0
  @count = 0
  @bits_written = 0
end

Instance Attribute Details

#bits_written ⇒ Object (readonly)

Returns the value of attribute bits_written.



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# File 'lib/jxl/bit/writer.rb', line 6

def bits_written
  @bits_written
end

Instance Method Details

#align ⇒ Object 



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# File 'lib/jxl/bit/writer.rb', line 26

def align
  write((-@count) & 7, 0)
end

#bytes ⇒ Object 



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# File 'lib/jxl/bit/writer.rb', line 30

def bytes
  align
  @bytes.dup
end

#write(count, value) ⇒ Object

Raises:

  • (ArgumentError) 


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# File 'lib/jxl/bit/writer.rb', line 15

def write(count, value)
  raise ArgumentError, "invalid bit count" unless count.between?(0, 64)
  raise ArgumentError, "value does not fit" if value.negative? || value.bit_length > count

  @buffer |= value << @count
  @count += count
  @bits_written += count
  flush_bytes
  self
end