1 files changed, 91 insertions, 0 deletions
diff --git a/internal/contentenc/content_test.go b/internal/contentenc/content_test.go
new file mode 100644
index 0000000..70ad58d
--- /dev/null
+++ b/internal/contentenc/content_test.go
@@ -0,0 +1,91 @@
+package contentenc
+
+import (
+	"testing"
+)
+
+type testRange struct {
+	offset uint64
+	length uint64
+}
+
+func TestSplitRange(t *testing.T) {
+	var ranges []testRange
+
+	ranges = append(ranges, testRange{0, 70000},
+		testRange{0, 10},
+		testRange{234, 6511},
+		testRange{65444, 54},
+		testRange{0, 1024 * 1024},
+		testRange{0, 65536},
+		testRange{6654, 8945})
+
+	key := make([]byte, KEY_LEN)
+	f := NewCryptFS(key, true, false, true)
+
+	for _, r := range ranges {
+		parts := f.ExplodePlainRange(r.offset, r.length)
+		var lastBlockNo uint64 = 1 << 63
+		for _, p := range parts {
+			if p.BlockNo == lastBlockNo {
+				t.Errorf("Duplicate block number %d", p.BlockNo)
+			}
+			lastBlockNo = p.BlockNo
+			if p.Length > DEFAULT_PLAINBS || p.Skip >= DEFAULT_PLAINBS {
+				t.Errorf("Test fail: n=%d, length=%d, offset=%d\n", p.BlockNo, p.Length, p.Skip)
+			}
+		}
+	}
+}
+
+func TestCiphertextRange(t *testing.T) {
+	var ranges []testRange
+
+	ranges = append(ranges, testRange{0, 70000},
+		testRange{0, 10},
+		testRange{234, 6511},
+		testRange{65444, 54},
+		testRange{6654, 8945})
+
+	key := make([]byte, KEY_LEN)
+	f := NewCryptFS(key, true, false, true)
+
+	for _, r := range ranges {
+
+		blocks := f.ExplodePlainRange(r.offset, r.length)
+		alignedOffset, alignedLength := blocks[0].JointCiphertextRange(blocks)
+		skipBytes := blocks[0].Skip
+
+		if alignedLength < r.length {
+			t.Errorf("alignedLength=%d is smaller than length=%d", alignedLength, r.length)
+		}
+		if (alignedOffset-HEADER_LEN)%f.cipherBS != 0 {
+			t.Errorf("alignedOffset=%d is not aligned", alignedOffset)
+		}
+		if r.offset%f.plainBS != 0 && skipBytes == 0 {
+			t.Errorf("skipBytes=0")
+		}
+	}
+}
+
+func TestBlockNo(t *testing.T) {
+	key := make([]byte, KEY_LEN)
+	f := NewCryptFS(key, true, false, true)
+
+	b := f.CipherOffToBlockNo(788)
+	if b != 0 {
+		t.Errorf("actual: %d", b)
+	}
+	b = f.CipherOffToBlockNo(HEADER_LEN + f.cipherBS)
+	if b != 1 {
+		t.Errorf("actual: %d", b)
+	}
+	b = f.PlainOffToBlockNo(788)
+	if b != 0 {
+		t.Errorf("actual: %d", b)
+	}
+	b = f.PlainOffToBlockNo(f.plainBS)
+	if b != 1 {
+		t.Errorf("actual: %d", b)
+	}
+}