open/write/close tiff in local buffer instead of using file?

[Horvat Johann]

Dear TIFF forum members,

Is there any possibility to let the following simple (modified) sample
from http://www.ibm.com/developerworks/linux/library/l-libtiff/ use the
tiffbuffer instead of writing the output.tif to the filesystem?

I'll need this, because I'm trying to write mxf files (single large  
file),
which will contain a sequence of DNG/TIFF images...

Thanks in advance
Johann

--------------------------------------------
#include <stdio.h>
#include <tiffio.h>

int main(int argc, char *argv[]){
  // Define an image
  char buffer[25 * 144] = { /* boring hex omitted */ };

  /* tiff output buffer, somewhat bigger than the original buffer */  
char
tiffbuffer[25*144*2];

  TIFF *image;

  // Open the TIFF file
  if((image = TIFFOpen("output.tif", "w")) == NULL){
    printf("Could not open output.tif for writing\n");
    exit(42);
  }

  // We need to set some values for basic tags before we can add any  
data
TIFFSetField(image, TIFFTAG_IMAGEWIDTH, 25 * 8);
  TIFFSetField(image, TIFFTAG_IMAGELENGTH, 144);
  TIFFSetField(image, TIFFTAG_BITSPERSAMPLE, 1);
  TIFFSetField(image, TIFFTAG_SAMPLESPERPIXEL, 1);
  TIFFSetField(image, TIFFTAG_ROWSPERSTRIP, 144);

  TIFFSetField(image, TIFFTAG_COMPRESSION, COMPRESSION_CCITTFAX4);
TIFFSetField(image, TIFFTAG_PHOTOMETRIC, PHOTOMETRIC_MINISWHITE);
TIFFSetField(image, TIFFTAG_FILLORDER, FILLORDER_MSB2LSB);
  TIFFSetField(image, TIFFTAG_PLANARCONFIG, PLANARCONFIG_CONTIG);

  TIFFSetField(image, TIFFTAG_XRESOLUTION, 150.0);
  TIFFSetField(image, TIFFTAG_YRESOLUTION, 150.0);
  TIFFSetField(image, TIFFTAG_RESOLUTIONUNIT, RESUNIT_INCH);

  // Write the information to the file
  TIFFWriteEncodedStrip(image, 0, buffer, 25 * 144);

  // Close the file
  TIFFClose(image);
}
--------------------------------------------


_______________________________________________
Tiff mailing list: Tiff@...
http://lists.maptools.org/mailman/listinfo/tiff
http://www.remotesensing.org/libtiff/

[Bob Friesenhahn]

On Mon, 19 Oct 2009, Horvat Johann wrote:

> Dear TIFF forum members,
>
> Is there any possibility to let the following simple (modified) sample
> from http://www.ibm.com/developerworks/linux/library/l-libtiff/ use the
> tiffbuffer instead of writing the output.tif to the filesystem?
>
> I'll need this, because I'm trying to write mxf files (single large
> file),
> which will contain a sequence of DNG/TIFF images...

If you use TIFFClientOpen() then you can supply your own I/O callbacks
in order to use a buffer in memory.  After the TIFF has been written
to a memory buffer, you can append it to your MXF file.  There is also
the option to use TIFFClientOpen() and have your I/O wrapper functions
adjust the file offsets so that a new TIFF appends to the file.  TIFF
I/O does seeks and requests the file size so you would need to
intercept these requests and lie appropriately.

Bob
--
Bob Friesenhahn
bfriesen@..., http://www.simplesystems.org/users/bfriesen/
GraphicsMagick Maintainer,    http://www.GraphicsMagick.org/
_______________________________________________
Tiff mailing list: Tiff@...
http://lists.maptools.org/mailman/listinfo/tiff
http://www.remotesensing.org/libtiff/

[Edward Lam]

Bob Friesenhahn wrote:
> If you use TIFFClientOpen() then you can supply your own I/O callbacks
> in order to use a buffer in memory.  After the TIFF has been written
> to a memory buffer, you can append it to your MXF file.  There is also
> the option to use TIFFClientOpen() and have your I/O wrapper functions
> adjust the file offsets so that a new TIFF appends to the file.  TIFF
> I/O does seeks and requests the file size so you would need to
> intercept these requests and lie appropriately.

There's a similar example that can be found under the contrib/stream
directory in the libtiff source distribution. If you're using C++, then
you can probably use it directly, calling TiffStream::makeFileStream()
with an ostrstream of your buffer.

Regards,
-Edward
_______________________________________________
Tiff mailing list: Tiff@...
http://lists.maptools.org/mailman/listinfo/tiff
http://www.remotesensing.org/libtiff/