I have the following code:
//
// Now write EXIFTAG_CFAPATTERN
which is basically what we put into cfaDimPat
// when the other (non-EXIF)
CFA related tags were written.
//
if (cfa)
{
constexpr
uint16_t count = sizeof(cfaDimPat.dim) + sizeof(cfaDimPat.cfa.cfa4);
TIFFSetField(m_tiff, EXIFTAG_CFAPATTERN, count, cfaDimPat);
}
Which works just fine on Windows. However, on Linux I get a SIGSEGV and my
signal handler prints a backtrace as follows:
00002431 2025-06-22 04:43:00.002 005575 7f8a2f604100 >In
signalHandler(SIGSEGV)
00002432 2025-06-22 04:43:00.064 005575 7f8a2f604100
>__GI___sigaction at :?
00002432 2025-06-22 04:43:00.064 005575 7f8a2f604100 >
00002433 2025-06-22 04:43:00.110 005575 7f8a2f604100
>__memcpy_avx_unaligned_erms at
./string/../sysdeps/x86_64/multiarch/memmove-vec-unaligned-erms.S:399
00002433 2025-06-22 04:43:00.110 005575 7f8a2f604100 >
00002434 2025-06-22 04:43:00.147 005575 7f8a2f604100
>_TIFFVSetField at tif_dir.c:?
00002434 2025-06-22 04:43:00.147 005575 7f8a2f604100 >
00002435 2025-06-22 04:43:00.186 005575 7f8a2f604100
>TIFFSetField at ??:?
00002435 2025-06-22 04:43:00.186 005575 7f8a2f604100 >
00002436 2025-06-22 04:43:00.743 005575 7f8a2f604100
>CTIFFWriter::Open() at
/home/amonra/.vs/DSS/DeepSkyStackerKernel/TIFFUtil.cpp:1077
Where line 1077 is the TIFFSetField call above.
tif_dirinfo.c says this about that tag:
{EXIFTAG_CFAPATTERN, -1, -1, TIFF_UNDEFINED, 0, TIFF_SETGET_C16_UINT8,
FIELD_CUSTOM, 1, 1, "CFAPattern", NULL}
Have I got the type for the count value incorrect or got that value wrong
(should I provide the count of uint16_t values rather than count of bytes)?
The cfaDimPat structure is defined as follows:
struct
{
uint16_t dim[2]{ 0 };
union
{
uint8_t cfa4[4];
uint8_t cfa9[9];
uint8_t cfa16[16];
} cfa { 0 };
} cfaDimPat;
Thank you, David
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