Module: BinData::IO::Common::UnSeekableStream

Defined in:
lib/bindata/io.rb

Overview

Manually keep track of offset for unseekable streams.

Instance Method Summary collapse

Instance Method Details

#num_bytes_remaining ⇒ Object

The number of bytes remaining in the input stream.

Raises:

  • (IOError) 


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# File 'lib/bindata/io.rb', line 130

def num_bytes_remaining
  raise IOError, "stream is unseekable"
end

#offset_raw ⇒ Object 



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# File 'lib/bindata/io.rb', line 125

def offset_raw
  @offset
end

#with_readahead ⇒ Object

All io calls in block are rolled back after this method completes.



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# File 'lib/bindata/io.rb', line 136

def with_readahead
  mark = @offset
  @read_data = ""
  @in_readahead = true

  class << self
    alias_method :read_raw_without_readahead, :read_raw
    alias_method :read_raw, :read_raw_with_readahead
  end

  begin
    yield
  ensure
    @offset = mark
    @in_readahead = false
  end
end