Class: BinData::IO::RawIO

Inherits:
Object
  • Object
show all
Defined in:
lib/bindata/io.rb

Overview

API used to access the raw data stream.

Instance Method Summary collapse

Constructor Details

#initialize(io) ⇒ RawIO

Returns a new instance of RawIO.



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# File 'lib/bindata/io.rb', line 316

def initialize(io)
  @io = io
  @pos = 0

  if is_seekable?(io)
    @initial_pos = io.pos
  else
    singleton_class.prepend(UnSeekableIO)
  end
end

Instance Method Details

#is_seekable?(io) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/bindata/io.rb', line 327

def is_seekable?(io)
  io.pos
rescue NoMethodError, Errno::ESPIPE, Errno::EPIPE, Errno::EINVAL
  nil
end

#num_bytes_remaining ⇒ Object 



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# File 'lib/bindata/io.rb', line 337

def num_bytes_remaining
  start_mark = @io.pos
  @io.seek(0, ::IO::SEEK_END)
  end_mark = @io.pos
  @io.seek(start_mark, ::IO::SEEK_SET)

  end_mark - start_mark
end

#offset ⇒ Object 



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# File 'lib/bindata/io.rb', line 346

def offset
  @pos
end

#read(n) ⇒ Object 



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# File 'lib/bindata/io.rb', line 361

def read(n)
  @io.read(n).tap { |data| @pos += (data&.size || 0) }
end

#seek_abs(n) ⇒ Object 



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# File 'lib/bindata/io.rb', line 356

def seek_abs(n)
  @io.seek(n + @initial_pos, ::IO::SEEK_SET)
  @pos = n
end

#seekable? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/bindata/io.rb', line 333

def seekable?
  true
end

#skip(n) ⇒ Object

Raises:

  • (IOError) 


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# File 'lib/bindata/io.rb', line 350

def skip(n)
  raise IOError, "can not skip backwards" if n.negative?
  @io.seek(n, ::IO::SEEK_CUR)
  @pos += n
end

#write(data) ⇒ Object 



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# File 'lib/bindata/io.rb', line 365

def write(data)
  @io.write(data)
end