issue-#133 Encoding/Decoding unicode filenames & paths

[Ivan Denisov]

Encoder/Decoder can not decode Unicode filenames.

Encoding process goes well, but then during decoding the filenames in dialog list shown wrong and BlackBox can not create such files.

http://redmine.blackboxframework.org/issues/133

Reported by Hans Klaver
http://community.blackboxframework.org/ ... f=32&t=141

[Josef Templ]

I am not sure that the error is only in the decoding.

Look at StdCoder.WriteHeader:

Code: Select all

			ch := name[i]; INC(byte, ASH(ORD(ch), bit)); INC(bit, 8);

This line assumes 8 bit characters, if I interpret it right.

- Josef

[Zinn]

Josef, the error is in Decode & in Encode. Here is the draft of my correction. Ivan please create a new save set and check if the new save set can be decode. The old broken one can't decode with this corrections.
Further we should check if there is no incompatibility with other existing save sets.
-Helmut

Code: Select all

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  --- end of encoding ---

[Zinn]

I forgot to delete the debug ASSERT in the procedure ShowError. It should be deleted.
- Helmut

[Josef Templ]

I have created issue-#133 with Helmut's changes plus

- ListFiles also needs to be changed, otherwise 'About encoded Material' still lists wrong file names.
- nn renamed to utf8.

Here are the diffs: http://redmine.blackboxframework.org/pr ... 6a0f3ab1b6.

Do we need to care about compatibility with the old version?
My understanding is that the old version worked for 8-bit characters in file names only, i.e. for Latin-1.
I have tested this under a German Windows with German special characters and it worked.
With the new version decoding generates a TRAP because conversion of UTF-8 to CHARs fails.
It would be possible to change the ASSERT to an IF - ELSE that uses the old format in case the UTF-8 conversion fails.

How does and did it behave under Cyrillic Windows? The test below consists of two files with german special characters.

- Josef

StdCoder.Decode ..,1 ..X.....l9Sl9SGQfnxwarwaLLyKmCas3js3D7jxtTSnPS8HLyKmC4
y0,...
1Ak...rC....58FTuPE,5TWyqlKrqKKrGrtumdGLmGorCquU2hgnRAXDFTvMUn7FTvMf1G2sET
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Ik0k2Ex8.,E.cUXDJ99SdfJHPNjvQCJuGKfaqmY6MwdONl1QCh0708T,U..w.YY0.,sUGpmWbB
xhYhAbndMHT9NY6Mw.sQq2Y6cwB.0.b.,6.Q,6.k.kz9ssHpmsETfPdfQT9PNPNZvQRtIdnVGL
tmKWKqt2Ul1.UiQcjpho,YcZRiX3.5011.85...CLL.U2V.Iy2U.UIU.U7U.2..AU0CyIhA8pu
mqm8rtumdcIf9PY62Ulb8.CLL8pumqmY62UmT.6.QJw.QI2U.sU.ktumdsIdPSNPN7ONbH.4D.
o3aLq.,cwD.0.E2EhU.E,,.RNEd9RZPO3PRdPNb9F9vQ0U2U...GG.6.16.6.665hKE.mLT5UT
yB4.4.0E.cUUB,bnUG5..E...p.0.4.I3tfj1E.6.VQ.E..YVsH4EKithQVs9E3Qw70.5uP..w
,6..E2E.U76.ImCRCpc85J.nT32kwL,ZcIFHBrGA,WJ....
1Ak...rC....58FTuPE,5TWyqlKrqKKrGrtumdGLmGorCquU2hgnRAXDFTvMUn7FTvMf1G2sET
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mqm8rtumdcIf9PY62Ulb8.CLL8pumqmY62UmT.6.QJw.QI2U.sU.ktumdsIdPSNPN7ONbH.4D.
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yB4.4.0E.cUUB,bnUG5..E...p.0.4.I3tfj1E.6.VQ.E..YVsH4EKithQVs9E3Qw70.5uP..w
,6..E2E.U76.ImCRCpc85J.nT32kwL,ZcIFHBrGA,WJ....
--- end of encoding ---

[DGDanforth]

With the new version decoding generates a TRAP because conversion of UTF-8 to CHARs fails.
It would be possible to change the ASSERT to an IF - ELSE that uses the old format in case the UTF-8 conversion fails.

I feel we definitely need to be backward compatible since archived coded files should still be decodable.
-Doug

[Josef Templ]

For ASCII names (7 bit) it is already compatible.
The question is how to treat non-ascii names, in particular Latin-1 (8 bit).

[Zinn]

To get it backward compatible we have to write

IF res = 0 THEN Kernel.Utf8ToString(utf8, name, res); IF res = 2 THEN res := 0 END; ASSERT(res = 0) END;

in procedure ReadHeader, DecodeFileList and ListFiles.

It is important to have IF res = 0 THEN in front of the Kernel.Utf8ToString translation. It doesn't matter if want compatibility.
We need the statement IF res = 2 THEN res := 0 END; for backward compatibility.

The backward compatibility works for Latin-1 only. It does not work for Cyrillic Windows. This problem here starts with Cyrillic encode does not work.

- Helmut

[Ivan Denisov]

I tested the version
http://blackboxframework.org/unstable/i ... a1.701.zip
All works fine now. IMHO the issue is ready for voting.

[Josef Templ]

Ivan, did you try to decode my test file under BB1.6 with Russian Windows?

What are the file names that you get?

This test would show if full Latin-1 support was available in 1.6 and 1.7.
If we want to retain Latin-1 support as it was before, we would have to do a little
more than what Helmut proposed, I think.

- Josef