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Fix #559 DNG 1.6 passcount assertion

Su Laus requested to merge Su_Laus/libtiff:fix_559_DNG_1.6_passcount_error into master

Fix #559 (closed) DNG 1.6 passcount assertion

Amend DNG tags definition introduced with MR 482:

  • DNG 1.6 tags specified as UTF-8 strings are defined as variable TIFF_BYTE with passcount=TRUE.
  • For all tags with TIFF_SETGET_C32_UINT8 the readcount and writecount were corrected to -3 (TIFF_VARIABLE2).

Testprogram to write and read all tags defined within LibTIFF is introduced. It also checks for valid passcount flag setting for the defined tags but some special tags are excluded from that check.

Closes #559 (closed), #574 (closed).

Edited by Su Laus

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