- update to 4.4.0:
  * TIFFIsBigTiff() function added.
  * Functions TIFFFieldSetGetSize() and TIFFieldSetGetCountSize() added.
  * LZWDecode(): major speed improvements (~30% faster)
  * Predictor 2 (horizontal differenciation): support 64-bit
  * Support libjpeg 9d
  * avoid hang in TIFFRewriteDirectory() if a classic file > 4 GB is attempted
    to be created
  * tif_jbig.c: fix crash when reading a file with multiple IFD in
    memory-mapped mode and when bit reversal is needed
  * TIFFFetchNormalTag(): avoid calling memcpy() with a null source pointer and
    size of zero
  * TIFFWriteDirectoryTagData(): turn assertion on data length into a runtime
    check
  * TIFFFetchStripThing(): avoid calling memcpy() with a null source pointer
    and size of zero
  * TIFFReadDirectory(): avoid calling memcpy() with a null source pointer and
    size of zero
  * TIFFYCbCrToRGBInit(): avoid Integer-overflow
  * TIFFGetField(TIFFTAG_STRIPBYTECOUNTS/TIFFTAG_STRIPOFFSETS): return error if
    returned pointer is NULL (fixes #342)
  * OJPEG: avoid assertion when using TIFFReadScanline()
  * TIFFReadDirectory: fix OJPEG hack
  * LZW codec: fix support for strips/tiles > 2 GB on Windows
  * TIFFAppendToStrip(): fix rewrite-in-place logic
  * Fix TIFFRewriteDirectory discarding directories.
  * TIFFReadCustomDirectory(): avoid crash when reading SubjectDistance tag on
    a non EXIF directory
  * Fix Segmentation fault printing GPS directory if Altitude tag is present
  * tif_jpeg.c: do not emit progressive scans with mozjpeg. (#266)

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