Add bambu-nfc dump parse, Key-A HKDF, and spool merge.

Parse filanfc-dump/v1 zip/JSON, Bambu 1K images, and merge stickers by tray UID. dump and mifare packages stay importable for a later common library.

mifare/mifare_test.go

@@ -0,0 +1,30 @@
+package mifare
+
+import "testing"
+
+func TestSectorOfAndBlockRange(t *testing.T) {
+	t.Parallel()
+	if got := SectorOf(9); got != 2 {
+		t.Errorf("SectorOf(9) = %d; want 2", got)
+	}
+	first, last := BlockRange(2)
+	if first != 8 || last != 12 {
+		t.Errorf("BlockRange(2) = %d,%d; want 8,12", first, last)
+	}
+}
+
+func TestSectorBytes(t *testing.T) {
+	t.Parallel()
+	img := make([]byte, Size1K)
+	img[2*SectorSize] = 0xAB
+	got, err := SectorBytes(img, 2)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if got[0] != 0xAB || len(got) != SectorSize {
+		t.Errorf("SectorBytes sector 2: len=%d first=%02x", len(got), got[0])
+	}
+	if _, err := SectorBytes(img[:1023], 0); err == nil {
+		t.Fatal("short image: want error")
+	}
+}