Method canonical

src/common/TextType.cpp:354–388

ULONG TextType::canonical(ULONG srcLen, const UCHAR* src, ULONG dstLen, UCHAR* dst)
{
	if (tt->texttype_fn_canonical)
		return (*tt->texttype_fn_canonical)(tt, srcLen, src, dstLen, dst);

	if (getCharSet()->isMultiByte())
	{
		fb_assert(tt->texttype_canonical_width == sizeof(ULONG));

		Firebird::HalfStaticArray<UCHAR, BUFFER_SMALL> utf16_str;

		ULONG utf16_len = getCharSet()->getConvToUnicode().convertLength(srcLen);

		ULONG errPos;

		// convert to UTF-16
		utf16_len = getCharSet()->getConvToUnicode().convert(srcLen, src,
			utf16_len, utf16_str.getBuffer(utf16_len), &errPos);

		USHORT errCode;

		// convert UTF-16 to UTF-32
		return UnicodeUtil::utf16ToUtf32(utf16_len, Firebird::Aligner<USHORT>(utf16_str.begin(), utf16_len),
			dstLen, Firebird::OutAligner<ULONG>(dst, dstLen), &errCode, &errPos) / sizeof(ULONG);
	}

	fb_assert(
		(tt->texttype_canonical_width == 0 && !tt->texttype_fn_canonical) ||
		tt->texttype_canonical_width == getCharSet()->minBytesPerChar());
	fb_assert(dstLen >= srcLen);

	memcpy(dst, src, srcLen);

	return srcLen / getCharSet()->minBytesPerChar();
}

BYTE TextType::getCanonicalWidth() const
{