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.

dump/dump_test.go

@@ -0,0 +1,58 @@
+package dump
+
+import (
+	"errors"
+	"os"
+	"path/filepath"
+	"strings"
+	"testing"
+)
+
+func TestParseJSONFixture(t *testing.T) {
+	t.Parallel()
+	f, err := os.Open(filepath.Join("..", "testdata", "dumps", "e27be276.json"))
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer f.Close()
+	d, err := ParseJSON(f)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if d.ChipUID != "e27be276" {
+		t.Errorf("ChipUID = %q", d.ChipUID)
+	}
+	if d.Format != FormatV1 {
+		t.Errorf("Format = %q", d.Format)
+	}
+	if len(d.Image) != 1024 {
+		t.Errorf("Image len = %d", len(d.Image))
+	}
+	if len(d.SectorsFail) != 0 {
+		t.Errorf("SectorsFail = %v", d.SectorsFail)
+	}
+}
+
+func TestParseZipFixture(t *testing.T) {
+	t.Parallel()
+	f, err := os.Open(filepath.Join("..", "testdata", "dumps.zip"))
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer f.Close()
+	dumps, err := ParseZip(f)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if len(dumps) != 6 {
+		t.Errorf("len = %d; want 6", len(dumps))
+	}
+}
+
+func TestParseJSONRejectsBadFormat(t *testing.T) {
+	t.Parallel()
+	_, err := ParseJSON(strings.NewReader(`{"format":"nope","chip_uid":"aa","dump_hex":"` + strings.Repeat("00", 1024) + `"}`))
+	if !errors.Is(err, ErrInvalidDump) {
+		t.Fatalf("err = %v; want ErrInvalidDump", err)
+	}
+}