[delphizip] Re: Windows 95 Compatibility [continuing]
- From: R Peters <rpeters@xxxxxxxxxxxxx>
- To: delphizip@xxxxxxxxxxxxx
- Date: Thu, 30 Sep 2010 05:12:41 +1000
To speed up searching for non-wild file names I pre-calculate the CRC of the
uppercase name to use as a hash key for comparison - if the keys don't match
there is no point trying to compare the names themselves (comparing the
names also uses uppercase - oh the stupid initial decision for Windows to
ignore case for file/domain names).
Of course doing it my way it will not correctly upcase characters that that
version of Windows does not handle but the rest won't handle it either -
early Windows only had just enough Unicode support to convert the MBCS to
Unicode for the file handling and that only for installed code-pages.
Russell Peters
On Wed, Sep 29, 2010 at 9:41 PM, James Turner <james.d.h.turner@xxxxxxxxxxxx
> wrote:
> > From memory I only use it to 'standardize' characters to before
> > calculating crc which is the reason I decided against a full
> > library with its enormous Unicode tables.
>
> I still don't understand how or why this code is being used - CRC means
> cyclic redundancy check to me.
>
> -- James Turner
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