+int ChunkReceiver::ToLoad() const noexcept {
+ return store.EstimateMissing();
+}
+
+void ChunkReceiver::LoadOne() {
+ if (!store.HasMissing()) return;
+
+ Chunk::Pos pos = store.NextMissing();
+ Chunk *chunk = store.Allocate(pos);
+ if (!chunk) {
+ // chunk store corrupted?
+ return;
+ }
+
+ if (save.Exists(pos)) {
+ save.Read(*chunk);
+ }
+}
+
+void ChunkReceiver::LoadN(size_t n) {
+ size_t end = min(n, size_t(ToLoad()));
+ for (size_t i = 0; i < end && store.HasMissing(); ++i) {
+ LoadOne();
+ }
+}
+
+void ChunkReceiver::StoreN(size_t n) {
+ size_t saved = 0;
+ for (Chunk &chunk : store) {
+ if (chunk.ShouldUpdateSave()) {
+ save.Write(chunk);
+ ++saved;
+ if (saved >= n) {
+ break;
+ }
+ }
+ }
+}
+
+