And still no test case. :p
| iris% cat test_jpeg.pike
| int main()
| {
| string s = Stdio.read_bytes("sugar.jpg");
| object i = Image.JPEG.decode(s);
| string out = Image.JPEG.encode(i);
| write("%O\n",out[..5]);
| return 0;
| }
| iris% pike test_jpeg.pike
| "\377\330\377\340\0\20"
