> On Mar 30, 2017, at 9:03 PM, Carl Hoefs <newsli...@autonomy.caltech.edu> > wrote: > >> On Mar 30, 2017, at 8:10 PM, Greg Parker <gpar...@apple.com >> <mailto:gpar...@apple.com>> wrote: >> >>> On Mar 30, 2017, at 7:09 PM, Carl Hoefs <newsli...@autonomy.caltech.edu >>> <mailto:newsli...@autonomy.caltech.edu>> wrote: >>> >>> 26 C3 E9 E2 6C 6A 38 0C 46 C3 E9 E2 6C 6A 40 0B 46 C3 E9 E2 83 6A DC 0A 66 >>> C3 E9 E2 83 6A 0E 0B >>> A5 C3 EF E2 AF 6A 40 0B A5 C3 EF E2 C6 6A 40 0B C5 C3 F5 E2 C6 6A 16 0A C5 >>> C3 F5 E2 DC 6A 0E 0B >>> 26 C3 3C E3 9E 62 B2 09 26 C3 3C E3 9E 62 B2 09 26 C3 36 E3 B4 62 BA 08 06 >>> C3 36 E3 CB 62 C2 07 >>> 45 C4 76 E3 44 6C 38 0C 25 C4 76 E3 5A 6C 06 0C 25 C4 76 E3 5A 6C DC 0A 05 >>> C4 7D E3 70 6C DC 0A >> >> >> Byte-swapped VAX type D might be right, but it's so easy to be off by a >> factor of 2 here that it's hard to trust any guess. >> >> Using CFSwapInt64() from CoreFoundation/CFByteOrder.h and from_vax_d8() from >> https://pubs.usgs.gov/of/2005/1424/ <https://pubs.usgs.gov/of/2005/1424/>, >> your bytes above are: >> -41.7215935353 >> -49.7215935353 >> -49.7215935353 >> -49.7215935366 >> -49.7215935366 >> -57.7215935366 >> -57.7215935366 >> -82.9432328547 >> -82.9432328547 >> -82.9432328574 >> -82.9432328574 >> -98.9432786338 >> -98.9432786338 >> -98.9432786363 >> -98.9432786363 >> -41.7219100388 >> > > Enticing results! When I use CFSwapInt64(), it does this to the bytes: > > - raw bytes: 69BF5DE3 9F530306 > - swp bytes: 0603539F E35DBF69 > * [04] time_base: > 2400969845129752384725738662412037010364031309686872696685853017835577483033453697155629104443247189829603912142488904070729903714756009814926441089319983058422454699494905107871645497808138444180815872.000000 > > > The 'time_base' value is what I get when I printf the swapped-bytes value > with a %f formatter. > Not sure why you're getting good results...
CFSwapInt64() is not sufficient. I used CFSwapInt64() followed by from_vax_d8() from the USGS URL above. The latter is what performs the real floating-point format transformation from VAX to IEEE. -- Greg Parker gpar...@apple.com <mailto:gpar...@apple.com> Runtime Wrangler _______________________________________________ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
