/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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 org.apache.hadoop.fs.azure;
import java.nio.ByteBuffer;
import com.microsoft.azure.storage.blob.BlobRequestOptions;
/**
* Constants and helper methods for ASV's custom data format in page blobs.
*/
final class PageBlobFormatHelpers {
public static final short PAGE_SIZE = 512;
public static final short PAGE_HEADER_SIZE = 2;
public static final short PAGE_DATA_SIZE = PAGE_SIZE - PAGE_HEADER_SIZE;
// Hide constructor for utility class.
private PageBlobFormatHelpers() {
}
/**
* Stores the given short as a two-byte array.
*/
public static byte[] fromShort(short s) {
return ByteBuffer.allocate(2).putShort(s).array();
}
/**
* Retrieves a short from the given two bytes.
*/
public static short toShort(byte firstByte, byte secondByte) {
return ByteBuffer.wrap(new byte[] { firstByte, secondByte })
.getShort();
}
public static BlobRequestOptions withMD5Checking() {
BlobRequestOptions options = new BlobRequestOptions();
options.setUseTransactionalContentMD5(true);
return options;
}
}