Function MOV_make_string2

src/jrd/mov.cpp:360–419

ULONG MOV_make_string2(Jrd::thread_db* tdbb,
					 const dsc* desc,
					 USHORT ttype,
					 UCHAR** address,
					 Jrd::MoveBuffer& buffer,
					 bool limit)
{
/**************************************
 *
 *	M O V _ m a k e _ s t r i n g 2
 *
 **************************************
 *
 * Functional description
 *	Make a string, in a specified text type, out of a descriptor.
 *	The address of the resultant string is returned by reference.
 *	MOV_make_string2 returns the length of the string in bytes.
 *
 **************************************/

	if (desc->isBlob())
	{
		// fake descriptor
		dsc temp;
		temp.dsc_dtype = dtype_text;
		temp.setTextType(ttype);

		Firebird::UCharBuffer bpb;
		BLB_gen_bpb_from_descs(desc, &temp, bpb);

		Jrd::blb* blob = Jrd::blb::open2(tdbb, tdbb->getRequest()->req_transaction,
			reinterpret_cast<Jrd::bid*>(desc->dsc_address), bpb.getCount(), bpb.begin());

		ULONG size;

		if (temp.getCharSet() == desc->getCharSet())
		{
			size = blob->blb_length;
		}
		else
		{
			size = (blob->blb_length / INTL_charset_lookup(tdbb, desc->getCharSet())->minBytesPerChar()) *
				INTL_charset_lookup(tdbb, temp.getCharSet())->maxBytesPerChar();
		}

		*address = buffer.getBuffer(size);

		size = blob->BLB_get_data(tdbb, *address, size, true);

		if (limit && size > MAX_COLUMN_SIZE)
		{
			ERR_post(Arg::Gds(isc_arith_except) <<
					 Arg::Gds(isc_blob_truncation));
		}

		return size;
	}