while (len > 0) {
uint64_t block_num = offset / BLUESKY_BLOCK_SIZE;
gint block_offset = offset % BLUESKY_BLOCK_SIZE;
gint bytes = MIN(BLUESKY_BLOCK_SIZE - block_offset, len);
gboolean preserve = TRUE;
while (len > 0) {
uint64_t block_num = offset / BLUESKY_BLOCK_SIZE;
gint block_offset = offset % BLUESKY_BLOCK_SIZE;
gint bytes = MIN(BLUESKY_BLOCK_SIZE - block_offset, len);
gboolean preserve = TRUE;