* Re: tzdata bug?
2024-04-17 7:33 ` tzdata bug? alf salte
@ 2024-04-18 5:30 ` Brian Inglis
0 siblings, 0 replies; 2+ messages in thread
From: Brian Inglis @ 2024-04-18 5:30 UTC (permalink / raw)
To: cygwin
On 2024-04-17 01:33, alf salte via Cygwin wrote:
> The man 5 tzfile page says that data should be in big endian format but when I inspect a tzfile on my system it seems that the second part with 8 byte integers are in little endian format rather than the big endian that the man page says it should be.
> Is this intentional or is it a bug?
What are you using to inspect the file?
If you are using vim's xxd, remember that it defaults to big-endian format!
If you check 0x2c bytes after 2nd TZif# header, many files will have entries
ffffffffxxxxxxxx in increasing order to 00000000xxxxxxxx; for example:
$ xxd -s 0x537 -l 0x2c -g4 /usr/share/zoneinfo/Europe/London
00000537: 545a6966 32000000 00000000 00000000 TZif2...........
00000547: 00000000 00000008 00000008 00000000 ................
00000557: 000000f2 00000008 00000011 ............
$ xxd -s 0x563 -l 0x790 -g8 /usr/share/zoneinfo/Europe/London
00000563: ffffffff1a5d09cb ffffffff9b26ada0 .....].......&..
00000573: ffffffff9bd60520 ffffffff9ccf30a0 ....... ......0.
00000583: ffffffff9da4c3a0 ffffffff9e9c9da0 ................
00000593: ffffffff9f971aa0 ffffffffa085ba20 ...............
000005a3: ffffffffa176fca0 ffffffffa2659c20 .....v.......e.
000005b3: ffffffffa37bc8a0 ffffffffa44eb8a0 .....{.......N..
000005c3: ffffffffa53ffb20 ffffffffa6256020 .....?. .....%`
000005d3: ffffffffa727c620 ffffffffa82a2c20 .....'. .....*,
000005e3: ffffffffa8ebf8a0 ffffffffaa00d3a0 ................
000005f3: ffffffffaad51520 ffffffffabe9f020 ....... .......
00000603: ffffffffacc76c20 ffffffffadc9d220 ......l .......
00000613: ffffffffaea74e20 ffffffffafa079a0 ......N ......y.
00000623: ffffffffb0873020 ffffffffb192d0a0 ......0 ........
00000633: ffffffffb2704ca0 ffffffffb372b2a0 .....pL......r..
00000643: ffffffffb4502ea0 ffffffffb5495a20 .....P.......IZ
00000653: ffffffffb63010a0 ffffffffb73276a0 .....0.......2v.
00000663: ffffffffb80ff2a0 ffffffffb91258a0 ..............X.
00000673: ffffffffb9efd4a0 ffffffffbae90020 ...............
00000683: ffffffffbbd8f120 ffffffffbcdb5720 ....... ......W
00000693: ffffffffbdb8d320 ffffffffbeb1fea0 ....... ........
000006a3: ffffffffbf98b520 ffffffffc09b1b20 ....... .......
000006b3: ffffffffc1789720 ffffffffc27afd20 .....x. .....z.
000006c3: ffffffffc3587920 ffffffffc451a4a0 .....Xy .....Q..
000006d3: ffffffffc5385b20 ffffffffc63ac120 .....8[ .....:.
000006e3: ffffffffc758d6a0 ffffffffc7da09a0 .....X..........
000006f3: ffffffffca162690 ffffffffca975990 ......&.......Y.
00000703: ffffffffcbd11e90 ffffffffcc773b90 .............w;.
00000713: ffffffffcdb10090 ffffffffce605810 .............`X.
00000723: ffffffffcf90e290 ffffffffd06e5e90 .............n^.
00000733: ffffffffd1721610 ffffffffd1fb3210 .....r........2.
00000743: ffffffffd269fe20 ffffffffd36329a0 .....i. .....c).
00000753: ffffffffd449e020 ffffffffd51e21a0 .....I. ......!.
00000763: ffffffffd542fd90 ffffffffd5dfe010 .....B..........
00000773: ffffffffd64eac20 ffffffffd6fe03a0 .....N. ........
00000783: ffffffffd82e8e20 ffffffffd8f99520 ....... .......
00000793: ffffffffda0e7020 ffffffffdaebec20 ......p .......
000007a3: ffffffffdbe517a0 ffffffffdccbce20 ...............
000007b3: ffffffffddc4f9a0 ffffffffdeb4eaa0 ................
000007c3: ffffffffdfae1620 ffffffffe094cca0 ....... ........
000007d3: ffffffffe17248a0 ffffffffe26b7420 .....rH......kt
000007e3: ffffffffe3522aa0 ffffffffe45490a0 .....R*......T..
000007f3: ffffffffe5320ca0 ffffffffe63dad20 .....2.......=.
00000803: ffffffffe71b2920 ffffffffe81454a0 ......) ......T.
00000813: ffffffffe8fb0b20 ffffffffe9fd7120 ....... ......q
00000823: ffffffffeadaed20 ffffffffebdd5320 ....... ......S
00000833: ffffffffecbacf20 ffffffffedb3faa0 ....... ........
00000843: ffffffffee9ab120 ffffffffef8167a0 ....... ......g.
00000853: fffffffff09f7d20 fffffffff16149a0 ......} .....aI.
00000863: fffffffff27f5f20 fffffffff34a6620 ......_ .....Jf
00000873: fffffffff45f4120 fffffffff5210da0 ....._A .....!..
00000883: fffffffff63f2320 fffffffff700efa0 .....?# ........
00000893: fffffffff81f0520 fffffffff8e0d1a0 ....... ........
000008a3: fffffffff9fee720 fffffffffac0b3a0 ....... ........
000008b3: fffffffffbe803a0 fffffffffc7baba0 .............{..
000008c3: fffffffffdc7bb70 000000000370c620 .......p.....p.
000008d3: 0000000004295820 000000000550a820 .....)X .....P.
000008e3: 0000000006093a20 0000000007308a20 ......: .....0.
000008f3: 0000000007e91c20 0000000009106c20 ....... ......l
00000903: 0000000009c8fe20 000000000af04e20 ....... ......N
00000913: 000000000bb21aa0 000000000cd03020 ..............0
00000923: 000000000d91fca0 000000000eb01220 ...............
00000933: 000000000f71dea0 0000000010992ea0 .....q..........
00000943: 000000001151c0a0 00000000127910a0 .....Q.......y..
00000953: 000000001331a2a0 000000001458f2a0 .....1.......X..
00000963: 000000001523eb90 000000001638c690 .....#.......8..
00000973: 000000001703cd90 000000001818a890 ................
00000983: 0000000018e3af90 0000000019f88a90 ................
00000993: 000000001ac39190 000000001be1a710 ................
000009a3: 000000001cacae10 000000001dc18910 ................
000009b3: 000000001e8c9010 000000001fa16b10 ..............k.
000009c3: 00000000206c7210 0000000021814d10 .... lr.....!.M.
000009d3: 00000000224c5410 0000000023612f10 ...."LT.....#a/.
000009e3: 00000000242c3610 00000000254a4b90 ....$,6.....%JK.
000009f3: 00000000260c1810 00000000272a2d90 ....&.......'*-.
00000a03: 0000000027f53490 00000000290a0f90 ....'.4.....)...
00000a13: 0000000029d51690 000000002ae9f190 ....).......*...
00000a23: 000000002bb4f890 000000002cc9d390 ....+.......,...
00000a33: 000000002d94da90 000000002ea9b590 ....-...........
00000a43: 000000002f74bc90 0000000030899790 ..../t......0...
00000a53: 00000000315dd910 000000003272b410 ....1]......2r..
00000a63: 00000000333dbb10 0000000034529610 ....3=......4R..
00000a73: 00000000351d9d10 0000000036327810 ....5.......62x.
00000a83: 0000000036fd7f10 00000000381b9490 ....6.......8...
00000a93: 0000000038dd6110 0000000039fb7690 ....8.a.....9.v.
00000aa3: 000000003abd4310 000000003bdb5890 ....:.C.....;.X.
00000ab3: 000000003ca65f90 000000003dbb3a90 ....<._.....=.:.
00000ac3: 000000003e864190 000000003f9b1c90 ....>.A.....?...
00000ad3: 0000000040662390 0000000041843910 ....@f#.....A.9.
00000ae3: 0000000042460590 0000000043641b10 ....BF......Cd..
00000af3: 000000004425e790 000000004543fd10 ....D%......EC..
00000b03: 000000004605c990 000000004723df10 ....F.......G#..
00000b13: 0000000047eee610 000000004903c110 ....G.......I...
00000b23: 0000000049cec810 000000004ae3a310 ....I.......J...
00000b33: 000000004baeaa10 000000004cccbf90 ....K.......L...
00000b43: 000000004d8e8c10 000000004eaca190 ....M.......N...
00000b53: 000000004f6e6e10 00000000508c8390 ....Onn.....P...
00000b63: 0000000051578a90 00000000526c6590 ....QW......Rle.
00000b73: 0000000053376c90 00000000544c4790 ....S7l.....TLG.
00000b83: 0000000055174e90 00000000562c2990 ....U.N.....V,).
00000b93: 0000000056f73090 0000000058154610 ....V.0.....X.F.
00000ba3: 0000000058d71290 0000000059f52810 ....X.......Y.(.
00000bb3: 000000005ab6f490 000000005bd50a10 ....Z.......[...
00000bc3: 000000005ca01110 000000005db4ec10 ....\.......]...
00000bd3: 000000005e7ff310 000000005f94ce10 ....^......._...
00000be3: 00000000605fd510 00000000617dea90 ....`_......a}..
00000bf3: 00000000623fb710 00000000635dcc90 ....b?......c]..
00000c03: 00000000641f9910 00000000653dae90 ....d.......e=..
00000c13: 000000006608b590 00000000671d9090 ....f.......g...
00000c23: 0000000067e89790 0000000068fd7290 ....g.......h.r.
00000c33: 0000000069c87990 000000006add5490 ....i.y.....j.T.
00000c43: 000000006ba85b90 000000006cc67110 ....k.[.....l.q.
00000c53: 000000006d883d90 000000006ea65310 ....m.=.....n.S.
00000c63: 000000006f681f90 0000000070863510 ....oh......p.5.
00000c73: 0000000071513c10 0000000072661710 ....qQ<.....rf..
00000c83: 0000000073311e10 000000007445f910 ....s1......tE..
00000c93: 0000000075110010 00000000762f1590 ....u.......v/..
00000ca3: 0000000076f0e210 00000000780ef790 ....v.......x...
00000cb3: 0000000078d0c410 0000000079eed990 ....x.......y...
00000cc3: 000000007ab0a610 000000007bcebb90 ....z.......{...
00000cd3: 000000007c99c290 000000007dae9d90 ....|.......}...
00000ce3: 000000007e79a490 000000007f8e7f90 ....~y..........
$ xxd -s 0xcf3 -l 0xf2 -g1 /usr/share/zoneinfo/Europe/London
00000cf3: 04 01 02 01 02 01 02 01 02 01 02 01 02 01 02 01 ................
00000d03: 02 01 02 01 02 01 02 01 02 01 02 01 02 01 02 01 ................
00000d13: 02 01 02 01 02 01 02 01 02 01 02 01 02 01 02 01 ................
00000d23: 02 01 03 01 03 01 03 01 03 01 03 01 02 01 02 01 ................
00000d33: 03 01 02 01 02 01 02 01 02 01 02 01 02 01 02 01 ................
00000d43: 02 01 02 01 02 01 02 01 02 01 02 01 02 01 02 01 ................
00000d53: 02 01 02 01 02 01 02 01 02 01 02 01 05 07 01 02 ................
00000d63: 01 02 01 02 01 02 01 02 01 02 01 02 01 02 01 02 ................
00000d73: 06 07 06 07 06 07 06 07 06 07 06 07 06 07 06 07 ................
00000d83: 06 07 06 07 06 07 06 07 06 07 06 07 06 07 06 07 ................
00000d93: 06 07 06 07 06 07 06 07 06 07 06 07 06 07 06 07 ................
00000da3: 06 07 06 07 06 07 06 07 06 07 06 07 06 07 06 07 ................
00000db3: 06 07 06 07 06 07 06 07 06 07 06 07 06 07 06 07 ................
00000dc3: 06 07 06 07 06 07 06 07 06 07 06 07 06 07 06 07 ................
00000dd3: 06 07 06 07 06 07 06 07 06 07 06 07 06 07 06 07 ................
00000de3: 06 07 ..
$ xxd -s 0xde5 -l 0x30 -g6 -c12 /usr/share/zoneinfo/Europe/London
00000de5: ffffffb50000 00000e100104 ............
00000df1: 000000000008 00001c20010c ......... ..
00000dfd: 000000000008 00000e100004 ............
00000e09: 00000e100104 000000000008 ............
$ xxd -s 0xe15 -l 0x11 -g1 /usr/share/zoneinfo/Europe/London
00000e15: 4c 4d 54 00 42 53 54 00 47 4d 54 00 42 44 53 54 LMT.BST.GMT.BDST
00000e25: 00 .
$ xxd -s 0xe26 -l 0x10 -g1 /usr/share/zoneinfo/Europe/London
00000e26: 00 01 01 01 00 00 01 01 00 00 00 00 00 00 01 01 ................
$ xxd -s 0xe36 -l 0x1a -g1 /usr/share/zoneinfo/Europe/London
00000e36: 0a 47 4d 54 30 42 53 54 2c 4d 33 2e 35 2e 30 2f .GMT0BST,M3.5.0/
00000e46: 31 2c 4d 31 30 2e 35 2e 30 0a 1,M10.5.0.
--
Take care. Thanks, Brian Inglis Calgary, Alberta, Canada
La perfection est atteinte Perfection is achieved
non pas lorsqu'il n'y a plus rien à ajouter not when there is no more to add
mais lorsqu'il n'y a plus rien à retirer but when there is no more to cut
-- Antoine de Saint-Exupéry
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