Re: Problems reading PNG from memory
John Bowler <[email protected]> Thu, 8 Sep 2022 12:17:12 -0700
| Newsgroups | gmane.comp.graphics.png.devel |
|---|---|
| Message-ID | <CAP7U39_yBbhDOeL6PDSBnBL7COjMss_Dp0Xy-gS9XXLjYjzRiQ@mail.gmail.com> |
On Thu, Sep 8, 2022 at 11:46 AM John Bowler < [email protected]> wrote: > This should work: >> > > png_image image; >> image.version = PNG_IMAGE_VERSION; >> png_image_beging_read_from_memory(&image, *image_data*, sizeof >> *image_data*); >> if (PNG_IMAGE_FAILED(image)) >> fprintf(stderr, "PNG read failed: '%s'\n", image.message); > > A correction, the opaque pointer must be set to NULL as well: > png_image image; > *image.opaque = 0;* image.version = PNG_IMAGE_VERSION; > >> png_image_beging_read_from_memory(&image, *image_data*, sizeof > *image_data*); > >> if (PNG_IMAGE_FAILED(image)) > fprintf(stderr, "PNG read failed: '%s'\n", image.message); > If the opaque pointer isn't NULL on entry to png_image_begin_read_ the call will fail and, I think, crash (inside png_image_error). _______________________________________________ png-mng-implement mailing list png-mng-implement-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org https://lists.sourceforge.net/lists/listinfo/png-mng-implement