bool
combine_ucs2_ucs2 (RECODE_SUBTASK subtask)
{
unsigned value;
if (get_ucs2 (&value, subtask))
{
struct state *state = NULL;
if (subtask->task->byte_order_mark)
put_ucs2 (BYTE_ORDER_MARK, subtask);
while (true)
{
struct state *shift
= find_shifted_state (state, value, subtask->step);
if (shift)
{
state = shift;
if (!get_ucs2 (&value, subtask))
break;
}
else if (state)
{
if (state->result == NOT_A_CHARACTER)
backtrack_ucs2 (state, subtask);
else
put_ucs2 (state->result, subtask);
state = NULL;
}
else
{
put_ucs2 (value, subtask);
if (!get_ucs2 (&value, subtask))
break;
}
}
if (state)
{
if (state->result == NOT_A_CHARACTER)
backtrack_ucs2 (state, subtask);
else
put_ucs2 (state->result, subtask);
}
}
SUBTASK_RETURN (subtask);
}
bool
combine_byte_ucs2 (RECODE_CONST_STEP step, RECODE_TASK task)
{
unsigned value;
if (value = get_byte (task), value != EOF)
{
struct state *state = NULL;
if (task->byte_order_mark)
put_ucs2 (BYTE_ORDER_MARK, task);
while (true)
{
struct state *shift = find_shifted_state (state, value, step);
if (shift)
{
state = shift;
if (value = get_byte (task), value == EOF)
break;
}
else if (state)
{
if (state->result == NOT_A_CHARACTER)
backtrack_ucs2 (state, task);
else
put_ucs2 (state->result, task);
state = NULL;
}
else
{
put_ucs2 (value, task);
if (value = get_byte (task), value == EOF)
break;
}
}
if (state)
if (state->result == NOT_A_CHARACTER)
backtrack_ucs2 (state, task);
else
put_ucs2 (state->result, task);
}
TASK_RETURN (task);
}
static void
backtrack_ucs2 (struct state *state, RECODE_SUBTASK subtask)
{
if (state->result == NOT_A_CHARACTER)
{
backtrack_ucs2 (state->unshift, subtask);
put_ucs2 (state->character, subtask);
}
else
put_ucs2 (state->result, subtask);
}