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Fast IO buffering
C Ruby
branch: master
Failed to load latest commit information.
ext Put the native extension directly under lib
lib Bump version
spec Random is a 1.9ism :(
tasks Hrmm, this stuff seems to be missing/broken
.gitignore Nuke Jeweler and modernize
.rspec Whitespace fixups
.travis.yml Try all the rubies again Put the native extension directly under lib
LICENSE.txt Guess this code dates back to 2007 Add build status to README
Rakefile Hrmm, this stuff seems to be missing/broken
iobuffer.gemspec - iobuffer.rb added (so version.rb can be loaded and we


Build Status

IO::Buffer is a fast byte queue which is primarily intended for non-blocking I/O applications but is suitable wherever buffering is required. IO::Buffer is compatible with Ruby 1.8/1.9 and Rubinius.


IO::Buffer provides a subset of the methods available in Strings:

>> buf =
=> #<IO::Buffer:0x12fc708>
>> buf << "foo"
=> "foo"
>> buf << "bar"
=> "bar"
>> buf.to_str
=> "foobar"
>> buf.size
=> 6

The IO::Buffer#<< method is an alias for IO::Buffer#append. A prepend method is also available:

>> buf =
=> #<IO::Buffer:0x12f5250>
>> buf.append "bar"
=> "bar"
>> buf.prepend "foo"
=> "foo"
>> buf.append "baz"
=> "baz"
>> buf.to_str
=> "foobarbaz"

IO::Buffer#read can be used to retrieve the contents of a buffer. You can mix reads alongside adding more data to the buffer:

>> buf =
=> #<IO::Buffer:0x12fc5f0>
>> buf << "foo"
=> "foo"
>> 2
=> "fo"
>> buf << "bar"
=> "bar"
>> 2
=> "ob"
>> buf << "baz"
=> "baz"
>> 3
=> "arb"

Finally, IO::Buffer provides methods for performing non-blocking I/O with the contents of the buffer. The IO::Buffer#read_from(IO) method will read as much data as possible from the given IO object until the read would block.

The IO::Buffer#write_to(IO) method writes the contents of the buffer to the given IO object until either the buffer is empty or the write would block:

>> buf =
=> #<IO::Buffer:0x12fc5c8>
>> file ="README")
=> #<File:README>
>> buf.read_from(file)
=> 1713
>> buf.to_str
=> "= IO::Buffer\n\nIO::Buffer is a fast byte queue...

If the file descriptor is not ready for I/O, the Errno::EAGAIN exception is raised indicating no I/O was performed.


  • Fork this repository on github
  • Make your changes and send me a pull request
  • If I like them I'll merge them
  • If I've accepted a patch, feel free to ask for commit access


Copyright (c) 2007-12 Tony Arcieri. Distributed under the MIT License. See LICENSE.txt for further details.

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