LibTiff Mailing List

Joris,

Let's see if I understand this...  The application interface simply calls
the top-level functions, which are configured by TIFFClientOpen() to use the
proper I/O interface routines for the type of computer and I/O (stream,
file, buffer) called for.  Once thus configured, and with the platform
independent autoconfiguration of the CODECs that occurs during opening of
the TIFF itself, TIFFReadEncodedStrip() and TIFFWriteEncodedStrip() know
where and how to process the data provided.  As a result, to do my TStream
interface, I need only write TIFFStreamReadProc(), TIFFStreamWriteProc(),
TIFFStreamSeekProc(), TIFFStreamCloseProc(), TIFFStreamSizeProc(),
TIFFNoMapProc(), and TIFFNoUnmapProc() and a TIFFOpenStream() that calls
TIFFClientOpen() and passes it these function addresses.

One remaining question, to which I know the answer is yes, but I need to
know where to look for information:  Where do I find specifications or
requirements for writing these routines for which pointers are passed in
TIFFClientOpen()?

Thanks!  You have greatly enlightened me as to the structure and inner
workings of libTIFF!!

Roger Watkins


AWARE [SYSTEMS]		Imaging expertise for the Delphi developer
		TIFF and LibTiff Mailing List Archive
	LibTiff Mailing List TIFF and LibTiff Mailing List Archive March 2005 Previous Thread Next Thread Previous by Thread Next by Thread Previous by Date Next by Date Contact The TIFF Mailing List Homepage This list is run by Frank Warmerdam Archive maintained by AWare Systems	Thread 2005.03.15 17:56 "Need to write CCITT T.6 encoded TIFF file data directly to memory buffer", by Roger Watkins 2005.03.15 18:09 "Re: Need to write CCITT T.6 encoded TIFF file data directly tomemory buffer", by Joris Van Damme 2005.03.16 18:08 "Re: Need to write CCITT T.6 encoded TIFF file data directly tomemory buffer", by Roger Watkins 2005.03.16 19:38 "Re: Need to write CCITT T.6 encoded TIFF file data directlytomemory buffer", by Joris Van Damme 2005.03.16 22:04 "Re: Need to write CCITT T.6 encoded TIFF file data directlytomemory buffer", by Roger Watkins 2005.03.16 22:24 "Re: Need to write CCITT T.6 encoded TIFF file datadirectlytomemory buffer", by Joris Van Damme 2005.03.17 02:35 "Re: Need to write CCITT T.6 encoded TIFF file datadirectlytomemory buffer", by Roger Watkins 2005.03.17 03:10 "Re: Need to write CCITT T.6 encoded TIFF filedatadirectlytomemory buffer", by Joris Van Damme 2005.03.17 23:57 "Re: Need to write CCITT T.6 encoded TIFF file datadirectlytomemory buffer", by Roger Watkins 2005.03.16 22:04 "Re: Need to write CCITT T.6 encoded TIFF file data directlytomemory buffer", by Roger Watkins Joris, Let's see if I understand this... The application interface simply calls the top-level functions, which are configured by TIFFClientOpen() to use the proper I/O interface routines for the type of computer and I/O (stream, file, buffer) called for. Once thus configured, and with the platform independent autoconfiguration of the CODECs that occurs during opening of the TIFF itself, TIFFReadEncodedStrip() and TIFFWriteEncodedStrip() know where and how to process the data provided. As a result, to do my TStream interface, I need only write TIFFStreamReadProc(), TIFFStreamWriteProc(), TIFFStreamSeekProc(), TIFFStreamCloseProc(), TIFFStreamSizeProc(), TIFFNoMapProc(), and TIFFNoUnmapProc() and a TIFFOpenStream() that calls TIFFClientOpen() and passes it these function addresses. One remaining question, to which I know the answer is yes, but I need to know where to look for information: Where do I find specifications or requirements for writing these routines for which pointers are passed in TIFFClientOpen()? Thanks! You have greatly enlightened me as to the structure and inner workings of libTIFF!! Roger Watkins

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2005.03.16 22:04 "Re: Need to write CCITT T.6 encoded TIFF file data directlytomemory buffer", by Roger Watkins