public int Feed(IBytesConsumer consumer, int maxbytes)
{
int n = 0;
if (pendinglen == 0)
{
RefillBuffer();
}
int tofeed = maxbytes > 0 && maxbytes < pendinglen ? maxbytes : pendinglen;
if (tofeed > 0)
{
n = consumer.Consume(buf, offset, tofeed);
if (n > 0)
{
offset += n;
pendinglen -= n;
}
}
if (n < 1 && failIfNoFeed)
{
throw new PngjInputException("failed feed bytes");
}
return(n);
}