831    uint8 const *img_buffer, *img_buffer_end;  member
840    s->img_buffer = s->img_buffer_end;  in start_file()
851    s->img_buffer = (uint8 const *) buffer;  in start_mem()
861       s->img_buffer = s->img_buffer_end-1;  in refill_buffer()
863       *s->img_buffer = 0;  in refill_buffer()
866       s->img_buffer = s->buffer_start;  in refill_buffer()
874    if (s->img_buffer < s->img_buffer_end)  in get8()
875       return *s->img_buffer++;  in get8()
879       return *s->img_buffer++;  in get8()
895    return s->img_buffer >= s->img_buffer_end;     in at_eof()
907       int blen = s->img_buffer_end - s->img_buffer;  in skip()
909          s->img_buffer = s->img_buffer_end;  in skip()
915    s->img_buffer += n;  in skip()
922       int blen = s->img_buffer_end - s->img_buffer;  in getn()
925          memcpy(buffer, s->img_buffer, blen);  in getn()
927          s->img_buffer = s->img_buffer_end;  in getn()
932    if (s->img_buffer+n <= s->img_buffer_end) {  in getn()
933       memcpy(buffer, s->img_buffer, n);  in getn()
934       s->img_buffer += n;  in getn()