Web Browser Character Set Tests
Last modified: Thu Jan 12 05:18:00 PST 2012

Requirements:
1. ICU 4.2 (International Components for Unicode)
2. A Web server running PHP
3. Some Web browsers
4. Ruby 1.9.3

Purpose:
Test Web browser support for various character encodings. 

Description:
A couple of tests are included.  One for figuring out which charsets are supported
simply by looping through all registered aliases and seeing if the contentDocument.charset
DOM property reflects them.  And another test that attempts to identify which 
ascii-unsafe[2]  encodings are supported by the browser, by loading a transcoded string
and seeing if the browser decodes it.

There are more interesting ways to test Web browsers, such as by reverse engineering
the mapping tables for legacy characters and their mapped Unicode code points.

Contents:

  \src\ianacharsets.rb        # Parse the IANA charset file into the JSON format
  \src\transcode\transcode.c  # Transcode a string from one charset to another
  \web\*                      # Web pages for testing


[1] ascii-safe
An ASCII-compatible character encoding is a single-byte or variable-length 
encoding in which the bytes 0x09, 0x0A, 0x0C, 0x0D, 0x20 - 0x22, 0x26, 0x27, 
0x2C - 0x3F, 0x41 - 0x5A, and 0x61 - 0x7A, ignoring bytes that are the second 
and later bytes of multibyte sequences, all correspond to single-byte sequences 
that map to the same Unicode characters as those bytes in 
ANSI_X3.4-1968 (US-ASCII). [RFC1345] 

[2] ascii-unsafe
ASCII-compatible bytes do not map.