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April 2009
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2009.04.07 15:35 "Re: Writing tiff to in-memory buffer", by Bob Friesenhahn
On Tue, 7 Apr 2009, Christian Henning wrote: > Ok, my read function was wrong. Since I only want to write into the > buffer the read procedure should return 0 and not the size read. > Fixing that gives me a valid TIFF*. I also need to setup my seek_proc > to prohibit it from seeking on an empty ostream. Doing though would > raise the failbit. I don't understand why TIFFClientOpen is calling > seek_proc( 0,0). It seems redundant to me. Without thoroughly analyzing the code, (and making a WAG) I get the impression that libtiff reads back the header it just wrote to obtain the actual endianness of the data and the TIFF subformat. It is also true that a write stream should be flushed before depending on data being in the file. Bob -- Bob Friesenhahn bfriesen@simple.dallas.tx.us, http://www.simplesystems.org/users/bfriesen/ GraphicsMagick Maintainer, http://www.GraphicsMagick.org/