Add windows code for sha1 and crc32c

pkg/utils/checksum/crc32c/crc32c_windows.go

@@ -0,0 +1,51 @@
+/*
+ * Minimalist Object Storage, (C) 2014 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 crc32c
+
+import (
+	"hash/crc32"
+	"io"
+)
+
+var castanagoliTable = crc32.MakeTable(crc32.Castagnoli)
+
+/// Convenience functions
+
+// Sum32 - single caller crc helper
+func Sum32(buffer []byte) uint32 {
+	crc := crc32.New(castanagoliTable)
+	crc.Reset()
+	crc.Write(buffer)
+	return crc.Sum32()
+}
+
+// Sum - io.Reader based crc helper
+func Sum(reader io.Reader) (uint32, error) {
+	h := crc32.New(castanagoliTable)
+	var err error
+	for err == nil {
+		length := 0
+		byteBuffer := make([]byte, 1024*1024)
+		length, err = reader.Read(byteBuffer)
+		byteBuffer = byteBuffer[0:length]
+		h.Write(byteBuffer)
+	}
+	if err != io.EOF {
+		return 0, err
+	}
+	return h.Sum32(), nil
+}