This PR (and fix981_canonAutoFocus2) use a decoder listed in TiffMappingInfo to
decode Exif.Canon.AFInfo. The decoding function "manufactures" Exif tags such as
Exif.Canon.AFNumPoints from the data in Exif.Canon.AFInfo. These tags must never
be written to file and are removed from the metadata in
exif.cpp/ExifParser::encode().
Three of the tags created (AFPointsInFocus,AFPointsSelected, AFPrimaryPoint) are
bitmasks. As the camera can have up to 64 focus points, the tags are a 64 bit
mask to say which points are active. The function printBitmask() reports data
such as 1,2,3 or (none).
This decoding function decodeCanonAFInfo() added to TiffMappingInfo manufactures
the new tags. Normally, tags are processed by the binary tag decoder and that
approach was taken in branch fix981_canonAf. However, the binary tag decoder
cannot deal with AFInfo because the size of some metadata arrays cannot be
determined at compile time.
* Fix 582 Add support for FocusPosition in Sony RAW files
* Thanks to @boardhead sonyFpCrypt() works correctly. Removed debug code. Fixed typos.
* Update doc/templates/Makefile to process Sony2Fp
* Following review by @boardhead. Renamed sonyFpCrypt() as sonyTagDecipher().
* Fixed writing the tag thanks to @boardhead explaining encipher/decipher.
Sadly, ArrayCfg/crpyt does not know if he's encrypting/decrypting.
I've added a sniff in TiffEncoder::visitBinaryArrayEnd to avoid changing the API.
* Added URL to discussion concerning sonyTagCipher()
* make sonyTagCipher() a static function with no external visibility.
