[Mono-dev] [PATCH] Implement internal Encodings using unified code base

[Kornél Pál]

Hi,

Please review the attached patch.

First of all this patch fixes
https://bugzilla.novell.com/show_bug.cgi?id=363713

This patch only contains infrastructural changes that result in the
following:
- GetByteCount, GetBytes, GetCharCount, GetChars have one implementation per
encoding
- all internal encodings now use usafe code that results in better
performance
- internal encodings use the fastest possible code path to these
implementations
- inherited encodings use MS.NET compatible code paths
- encoding code can be maintained much easier
- argument checks are shared so code can't go out of sync

Note that no actual encoding algorytms are changed so there should be no
behavioral changes.

Also note that I added an InternalEncoding class that is only used by
Latin1Encoding currenly but I will later figure out some hack to integrate
external (I18N assemblies) encoding classes to this infrastructure and that
will use this InternalEncoding class.

Kornél 
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