Nico Weber 3423b54eb9 LibTextCodec: Make utf-16be and utf-16le codecs actually work ...

There were two problems:

1. They didn't handle surrogates
2. They used signed chars, leading to eg 0x00e4 being treated as 0xffe4

Also add a basic test that catches both issues.
There's some code duplication with Utf16CodePointIterator::operator*(),
but let's get things working first.

2023-01-22 21:30:44 +00:00

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