...ever since its inception in 16cba77220
"#112673# initial checkin of HWP filter" (but curr is needed as a local scratch
pad in the STARTT macro)
Change-Id: I7233bf99b7d6f9ac0d3d3384ba4508f84ba8fa38
Filter for a word processor file format popular in Korea (Hangul Word Processor). Unfortunately apparently there is a newer version of the file format in use nowadays and the code doesn't handle that correctly but silently corrupts the input. See fdo#70097.