Simplify erasure code by separating bitrot from erasure code (#5959)

cmd/bitrot_test.go

@@ -0,0 +1,71 @@
+/*
+ * Minio Cloud Storage, (C) 2018 Minio, Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package cmd
+
+import (
+	"io/ioutil"
+	"log"
+	"os"
+	"testing"
+)
+
+func TestBitrotReaderWriter(t *testing.T) {
+	tmpDir, err := ioutil.TempDir("", "")
+	if err != nil {
+		log.Fatal(err)
+	}
+	defer os.RemoveAll(tmpDir)
+
+	volume := "testvol"
+	filePath := "testfile"
+
+	disk, err := newPosix(tmpDir)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	disk.MakeVol(volume)
+
+	writer := newBitrotWriter(disk, volume, filePath, HighwayHash256)
+
+	err = writer.Append([]byte("aaaaaaaaa"))
+	if err != nil {
+		log.Fatal(err)
+	}
+	err = writer.Append([]byte("a"))
+	if err != nil {
+		log.Fatal(err)
+	}
+	err = writer.Append([]byte("aaaaaaaaaa"))
+	if err != nil {
+		log.Fatal(err)
+	}
+	err = writer.Append([]byte("aaaaa"))
+	if err != nil {
+		log.Fatal(err)
+	}
+	err = writer.Append([]byte("aaaaaaaaaa"))
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	reader := newBitrotReader(disk, volume, filePath, HighwayHash256, 35, writer.Sum())
+
+	if _, err = reader.ReadChunk(0, 35); err != nil {
+		log.Fatal(err)
+	}
+}