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November 2005

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2005.11.17 22:43 "[libtiff v3.7.3] TIFFClientOpen - possible bug when 'mode' = 'w' ?", by Nghia Tran

Hi

I'm writing a DLL that exposes a 'tiff2pdf' conversion routine so it can be
called from VB6. I base my code on the tool 'tiff2pdf' which comes part of
libtiff. So create my own structure, implement the 4 function pointers, and
use TIFFClientOpen() to pass in the handles. No problem with the input file.

For the output file, when I traced the call to TIFFClientOpen: 

   output = TIFFClientOpen("dummyOutput", "w", (thandle_t) &pdfFile,
                         MemFileReadProc, MemFileWriteProc,
                         MemFileSeekProc, MemFileCloseProc,
                         MemFileSizeProc, NULL,
                         NULL);

in the file tif_open.c, at line 169: 

    tif->tif_mode = m &~ (O_CREAT|O_TRUNC);

This statement causes the code that setups the TIFF header starting at line
307 to be skipped over.  So what is the purpose of line 169 ?

To make my code work, I commented out line 169 in tif_open.c, but I'm
unsure if there's any other problem elsewhere since this is my first
attempt at using libtiff.
My environment is VS6 SP6, WinXP SP1.
 
Can someone help ?

Thanks in advance.

  Nghia Tran.