xl: Moved to minio/minio - fixes #1112

pkg/xl/encoder.go

@@ -0,0 +1,71 @@
+/*
+ * Minio Cloud Storage, (C) 2015 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 xl
+
+import (
+	encoding "github.com/minio/minio/pkg/erasure"
+	"github.com/minio/minio/pkg/probe"
+)
+
+// encoder internal struct
+type encoder struct {
+	encoder *encoding.Erasure
+	k, m    uint8
+}
+
+// newEncoder - instantiate a new encoder
+func newEncoder(k, m uint8) (encoder, *probe.Error) {
+	e := encoder{}
+	params, err := encoding.ValidateParams(k, m)
+	if err != nil {
+		return encoder{}, probe.NewError(err)
+	}
+	e.encoder = encoding.NewErasure(params)
+	e.k = k
+	e.m = m
+	return e, nil
+}
+
+// TODO - think again if this is needed
+// GetEncodedBlockLen - wrapper around erasure function with the same name
+func (e encoder) GetEncodedBlockLen(dataLength int) (int, *probe.Error) {
+	if dataLength <= 0 {
+		return 0, probe.NewError(InvalidArgument{})
+	}
+	return encoding.GetEncodedBlockLen(dataLength, e.k), nil
+}
+
+// Encode - erasure code input bytes
+func (e encoder) Encode(data []byte) ([][]byte, *probe.Error) {
+	if data == nil {
+		return nil, probe.NewError(InvalidArgument{})
+	}
+	encodedData, err := e.encoder.Encode(data)
+	if err != nil {
+		return nil, probe.NewError(err)
+	}
+	return encodedData, nil
+}
+
+// Decode - erasure decode input encoded bytes
+func (e encoder) Decode(encodedData [][]byte, dataLength int) ([]byte, *probe.Error) {
+	decodedData, err := e.encoder.Decode(encodedData, dataLength)
+	if err != nil {
+		return nil, probe.NewError(err)
+	}
+	return decodedData, nil
+}