repopagestore_load_page_range
dp = repopagestore_load_page_range(&data->store, off / REPOPAGE_BLOBSIZE, (off + len - 1) / REPOPAGE_BLOBSIZE);
repopagestore_load_page_range(store, 0, store->num_pages - 1);
unsigned char *repopagestore_load_page_range(Repopagestore *store, unsigned int pstart, unsigned int pend);