[Esapi-php] Pretty print functions

[jah]

OK, attached is CodecDebug.php which is an initial attempt at the
functions for outputting codec debugging info - hopefully as you
envisaged , Mike.  Also attached is codec_debugging.patch which shows
the functions in use in Codec decode and encode, and in PercentCodec,
pretty much as you said it would be, I think.
I'm sure you'll let me know if it needs work - consider it a rough draft
and fire away.

Here's an example output:

DEBUG - [ -> ] DefaultEncoder->encodeForURL, Codec->encode,
PercentCodec->encodeCharacter:
Normalized codec input: 4 bytes ['' . "\0" . '' . "\0" . '' . "\0" . '<']
Normalized codec input: 4 bytes ['' . "\0" . '' . "\0" . '' . "\0" . 's']
Normalized codec input: 4 bytes ['' . "\0" . '' . "\0" . '' . "\0" . 'c']
Normalized codec input: 4 bytes ['' . "\0" . '' . "\0" . '' . "\0" . 'r']
Normalized codec input: 4 bytes ['' . "\0" . '' . "\0" . '' . "\0" . 'i']
Normalized codec input: 4 bytes ['' . "\0" . '' . "\0" . '' . "\0" . 'p']
Normalized codec input: 4 bytes ['' . "\0" . '' . "\0" . '' . "\0" . 't']
Normalized codec input: 4 bytes ['' . "\0" . '' . "\0" . '' . "\0" . '>']
Encoded: [%3Cscript%3E]

DEBUG - [ -> ] DefaultEncoder->canonicalize, Codec->decode,
PercentCodec->decodeCharacter:
Normalized codec input: 4 bytes ['' . "\0" . '' . "\0" . '' . "\0" . '%']
Normalized codec input: 4 bytes ['' . "\0" . '' . "\0" . '' . "\0" . '3']
Normalized codec input: 4 bytes ['' . "\0" . '' . "\0" . '' . "\0" . 'C']
Normalized codec input: 4 bytes ['' . "\0" . '' . "\0" . '' . "\0" . 's']
Normalized codec input: 4 bytes ['' . "\0" . '' . "\0" . '' . "\0" . 'c']
Normalized codec input: 4 bytes ['' . "\0" . '' . "\0" . '' . "\0" . 'r']
Normalized codec input: 4 bytes ['' . "\0" . '' . "\0" . '' . "\0" . 'i']
Normalized codec input: 4 bytes ['' . "\0" . '' . "\0" . '' . "\0" . 'p']
Normalized codec input: 4 bytes ['' . "\0" . '' . "\0" . '' . "\0" . 't']
Normalized codec input: 4 bytes ['' . "\0" . '' . "\0" . '' . "\0" . '%']
Normalized codec input: 4 bytes ['' . "\0" . '' . "\0" . '' . "\0" . '3']
Normalized codec input: 4 bytes ['' . "\0" . '' . "\0" . '' . "\0" . 'E']
Decoded: [<script>]

Regards,

jah

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