RE: Roundtripping in Unicode

From: Lars Kristan (lars.kristan@hermes.si)
Date: Wed Dec 15 2004 - 08:15:53 CST

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    Philippe Verdy wrote:
    > I have not
    > found a solution to this problem, and I don't know if such
    > solution even
    > exists; if such solution exists, it should be quite complex...).

    I think it should be possible to mathematically prove that it doesn't exist.

    So, I claim you cannot achive NOT-UTF-8 => UTF-16 => NOT-UTF-8 and UTF-16 =>
    NOT-UTF-8 => UTF-16 at the same time. But this is not really needed, since
    nothing of this affects any UTF trip (and none of the above is one).

    And, the funny thing is - currently NOT2-UTF-16 => NOT2-UTF-8 => NOT2-UTF-16
    *is* possible (NOT2, because it is not the same conversion, it is actually
    UCS2 conversion). But there is no need for it. NOT-UTF-8 => UTF-16 =>
    NOT-UTF-8 is THE most valuable one. Outside of Unicode that is. Unicode
    could acknowledge that fact and yield 128 codepoints.

    Lars

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