Method validateLength

src/jrd/cvt.cpp:505–532

ULONG EngineCallbacks::validateLength(CharSet* charSet, CHARSET_ID charSetId, ULONG length, const UCHAR* start,
	const USHORT size)
{
	fb_assert(charSet);

	if (charSet && (charSet->isMultiByte() || length > size))
	{
		const ULONG srcCharLength = charSet->length(length, start, true);
		const ULONG destCharLength = (ULONG) size / charSet->maxBytesPerChar();

		if (srcCharLength > destCharLength)
		{
			const ULONG spaceByteLength = charSet->getSpaceLength();
			const ULONG trimmedByteLength = charSet->removeTrailingSpaces(length, start);
			const ULONG trimmedCharLength = srcCharLength - (length - trimmedByteLength) / spaceByteLength;

			if (trimmedCharLength <= destCharLength)
				return trimmedByteLength + (destCharLength - trimmedCharLength) * spaceByteLength;
			else
			{
				err(Arg::Gds(isc_arith_except) << Arg::Gds(isc_string_truncation) <<
					Arg::Gds(isc_trunc_limits) << Arg::Num(destCharLength) << Arg::Num(srcCharLength));
			}
		}
	}

	return length;
}


ULONG TruncateCallbacks::validateLength(CharSet* charSet, CHARSET_ID charSetId, ULONG length, const UCHAR* start,