GSMEncoder encodes and decodes Ruby Strings to and from the SMS default alphabet. It also supports the default extension table. The default alphabet and it's extension table is defined in GSM 03.38

This is port of Twitter's Java implementation

Installation

NOTE: ruby >= 1.9.2 is required

gem install gsm_encoder

Usage

require 'gsm_encoder'

# encoding
GSMEncoder.encode 'hello @ world' # => binary string

# decoding
GSMEncoder.decode(GSMEncoder.encode('hi')) # => 'hi'

# can encode?
GSMEncoder.can_encode?('`') # => false

# replaces unsupported chars with '?'
GSMEncoder.encode('`') # => '?'

# replaces unsupported chars with a provided value ' '
GSMEncoder.encode('`', ' ') # => ' '

Updates

0.1.1

Added support for Spanish shift

0.1.2

Fixed bug when encoding line feed & carriage return

0.1.3

Adds the ability to provide the character used when encoding unsupported strings

0.1.4

Code cleanup and speedup

0.1.5

Even faster. About 4 times. Many thanks to @dlarrabee

0.1.7

Even faster! Many thanks to @ThomasSevestre