in jpegloader.c [82:90]
void image_from_buffer(ImageObject* self, void* buf, size_t size) {
FILE* source = fmemopen(buf, size, "rb");
if (source == NULL) {
PyErr_Format(PyExc_IOError, "failed to call fmemopen on buffer");
return;
}
image_from_file(self, source);
}