Chris Mullins <cmullins@yahoo.com> wrote:
> I've got a big unicode character, and i'm trying to build it into a string.
>
> The unicode character is in the range "0x10400", so it's going to require a
> surrogate pair.
>
> I've been through all the logic to iterate over strings that already have
> these pairs in them, but how do I encode this Unicode Character INTO the
> string? The string is UTF-8 encoded, but none of the things I've trided
> using the encoders seems to work right...
>
> Breaking it up into words (0x0001 and x0400) is obviously incorrect, as this
> violates the valid ranges for a high-surrogate .
>
> I'm at a loss as to how to deal with it from here...

"Jon Skeet" <skeet@pobox.com> wrote:
> Chris Mullins <cmullins@yahoo.com> wrote:
> > I've got a big unicode character, and i'm trying to build it into a
string.
> >
> > The unicode character is in the range "0x10400", so it's going to
require a
> > surrogate pair.
> >
>
> Try breaking the pair into 0xd801 and 0xdc00 - I believe the algorithm
> is basically:
>
> o Subtract 0x10000
> o High surrogate is 0xd800+(result/0x400)
> o Low surrogate is 0xdc00+(result%0x400)
>

Chris Mullins <cmullins@yahoo.com> wrote:
> After reading more, it looks like your suggestion is the best option for
> .NET. I'm going to take any code point > 0xFFFF and break it down into a
> surrogate pair, according to the algorithm found at:
> http://www.unicode.org/book/ch03.pdf
>
> This says the encoding chars will be encoded as:
> H = (S-0x10000) / 0x400 + 0xD800
> L = (S-0x10000) % 0x400 + 0xDC00
>
> Now, I need to figure out what to do next...
>
> Do I just append the High/Low surrogate pairs into my .NET string, or do I
> have to pass this character array through the approate UTF8/16 encoder to
> turn it into an encoded byte stream, and then somehow massage that into my
> string?