OpenEuphoria

Re: Self Extractor

• Posted by Juergen Luethje <j.lue at gmx.de> May 31, 2003
• 485 views

Hi Kat, you wrote:

> On 29 May 2003, at 9:20, Carl W. wrote:
>
>> mistertrik at hotmail.com wrote:
>>
>>> I tried using PKUNZIP.EXE, but it can't handle long filenames (truncates
>>> everything to 8 chars, ie PROGRAMF), and it borks about 3/4 of the way
>>> through
>>> the extraction.
>>>
>>> Basically, it needs to be DOS based and not munge up long filenames.. is
>>> that
>>> possible?
>>
>> DOS mode doesn't allow long filenames (Microsoft would rather you used
>> the GUI), but there's a tool out there called LFNDos that will give
>> access to long filenames in DOS mode.
>>
>> Second, grab a copy of the PKZip 2.5 package as this handles long
>> filenames when it thinks it sees Windows running (LFNDos fools it
>> successfully). Alternatively get the freeware DJGPP Unzip32.exe and
>> cwsdpmi.exe (along with LFNDOS) to do the unzipping.
>
> <prolly !helpful>
> It's my understanding you can do LFN in dos7 without windows running, and
> without any other apps, IF the dos program knows how to stuff the cpu
> registers for the interrupt call.

Sorry, this understanding is false. There must be an appropriate API for
Long File Names, and this is *not* provided by (any version of) bare
MS-DOS.
Normally, LFN are only available when IFSMgr (i.e. Windows 95+) is
running. Under bare MS-DOS, they only can be accessed by using special
TSR programs, such as
- LFNDOS: http://saturn.spaceports.com/~dosuser/dosutils.htm
- DOSLFN: http://www.tu-chemnitz.de/~heha/hs_freeware/doslfn.zip

That the DOS program knows how to stuff the cpu registers for the
interrupt call, is necessary of course, but it's not sufficient.
a) There must be an API for LFN, *and*
b) the program must call the proper functions of that API.

Point b) is simple for Eu programmers, because they just can use
my lib  http://www.rapideuphoria.com/lfn.zip  which does the job
automagically. 

Best regards,
   Juergen

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