Class: Snappy::Writer

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

Constant Summary collapse

MAGIC = 
"\x82SNAPPY\x0".force_encoding Encoding::ASCII_8BIT
DEFAULT_VERSION = 
1
MINIMUM_COMPATIBLE_VERSION = 
1
DEFAULT_BLOCK_SIZE = 
32 * 1024

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(io, block_size = DEFAULT_BLOCK_SIZE) ⇒ Writer

Returns a new instance of Writer.



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# File 'lib/snappy/writer.rb', line 14

def initialize(io, block_size = DEFAULT_BLOCK_SIZE)
  @block_size = block_size
  @buffer = ""
  @io = io
  @io.set_encoding Encoding::ASCII_8BIT unless RUBY_VERSION =~ /^1\.8/
  write_header!
  if block_given?
    yield self
    dump!
  end
end

Instance Attribute Details

#block_size ⇒ Object (readonly)

Returns the value of attribute block_size.



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# File 'lib/snappy/writer.rb', line 12

def block_size
  @block_size
end

#io ⇒ Object (readonly)

Returns the value of attribute io.



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# File 'lib/snappy/writer.rb', line 12

def io
  @io
end

Instance Method Details

#<<(msg) ⇒ Object Also known as: write 



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# File 'lib/snappy/writer.rb', line 26

def <<(msg)
  @buffer << msg.to_s
  dump! if @buffer.size > @block_size
end

#close ⇒ Object 



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# File 'lib/snappy/writer.rb', line 42

def close
  @io.close
end

#dump! ⇒ Object Also known as: flush 



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# File 'lib/snappy/writer.rb', line 33

def dump!
  compressed = Snappy.deflate(@buffer)
  @io << [compressed.size, compressed].pack("Na#{compressed.size}")
  @io.flush
  @buffer = ""
end