[Fribidi-discuss] What length should I expect in fribidi functions?
didi at tau.ac.il
Mon Aug 5 23:09:01 EST 2002
On Tue, Aug 06, 2002 at 10:31:49AM +0430, Behdad Esfahbod wrote:
> On Mon, 5 Aug 2002, Yedidyah Bar-David wrote:
> > Hello,
> > I declared variables of length FRIBIDI_MAX_STRING_LENGTH in a library
> > that uses fribidi (the babylon parser of wordtrans). Now, in one of
> > the latest versions of fribidi, FRIBIDI_MAX_STRING_LENGTH became too
> > large to allocate beforehand.
> FRIBIDI_MAX_STRING_LENGTH is the maximum length of a string that
> fribidi supports, it should not be used for allocations.
> > I have a string in ISO8859-8. I want to convert it to unicode, then do
> > log2vis, then back to ISO8859-8.
> > What length temporary arrays should be? can charset-to-unicode
> > make it more than 4 times bigger? 6 times? More than that?
> > Is it documented anywhere?
> The charset-to-unicode converts strings to UTF-32, not UTF-8, it
> means that the output needs exactly sizeof(FriBidiChar) times
> longer memory, which is 4 times by default. to convert a buffer
> char buf, you need to define a FriBidiChar out
> > In utf-8(7), it says:
> > * UTF-8 encoded UCS characters may be up to six bytes
> > long, however the Unicode standard specifies no charac
> > ters above 0x10ffff, so Unicode characters can only be
> > up to four bytes long in UTF-8.
> > Thanks,
> > Didi
> Behdad Esfahbod 15 Mordad 1381, 2002 Aug 6
> http://behdad.org/ [Finger for Geek Code]
> #define is_persian_leap(y) ((((y)-474)%2820+2820)%2820*31%128<31)
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