kits/app/Message.cpp

1112 	often the one receiving the message will not need to change the message
1546 BMessage::_UpdateOffsets(uint32 offset, int32 change)
1553 				field->offset += change;
1560 BMessage::_ResizeData(uint32 offset, int32 change)
1562 	if (change == 0)
1567 	if (change > 0) {
1570 		if (fDataAvailable >= (uint32)change) {
1574 				memmove(fData + offset + change, fData + offset,
1578 			_UpdateOffsets(offset, change);
1580 			fDataAvailable -= change;
1581 			fHeader->data_size += change;
1589 		size = max_c(size, fHeader->data_size + change);
1597 			memmove(fData + offset + change, fData + offset,
1601 		fHeader->data_size += change;
1604 		ssize_t length = fHeader->data_size - offset + change;
1606 			memmove(fData + offset, fData + offset - change, length);
1608 		// change is negative
1609 		fHeader->data_size += change;
1610 		fDataAvailable -= change;
1618 				_UpdateOffsets(offset, change);
1627 	_UpdateOffsets(offset, change);
1835 		int32 change = numBytes + sizeof(uint32);
1836 		result = _ResizeData(offset, change);
1846 		field->data_size += change;
2018 		int32 change = numBytes - currentSize;
2019 		result = _ResizeData(offset, change);
2026 		field->data_size += change;