/*
* 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.sshd.client.subsystem.sftp.extensions.helpers;
import java.io.IOException;
import java.io.StreamCorruptedException;
import java.util.Collection;
import org.apache.sshd.client.subsystem.sftp.RawSftpClient;
import org.apache.sshd.client.subsystem.sftp.SftpClient;
import org.apache.sshd.common.util.GenericUtils;
import org.apache.sshd.common.util.NumberUtils;
import org.apache.sshd.common.util.buffer.Buffer;
import org.apache.sshd.common.util.buffer.BufferUtils;
/**
* @author <a href="mailto:dev@mina.apache.org">Apache MINA SSHD Project</a>
*/
public abstract class AbstractMD5HashExtension extends AbstractSftpClientExtension {
protected AbstractMD5HashExtension(String name, SftpClient client, RawSftpClient raw, Collection<String> extras) {
super(name, client, raw, extras);
}
protected byte[] doGetHash(Object target, long offset, long length, byte[] quickHash) throws IOException {
Buffer buffer = getCommandBuffer(target, Long.SIZE + 2 * Long.BYTES + Integer.BYTES + NumberUtils.length(quickHash));
String opcode = getName();
putTarget(buffer, target);
buffer.putLong(offset);
buffer.putLong(length);
buffer.putBytes((quickHash == null) ? GenericUtils.EMPTY_BYTE_ARRAY : quickHash);
if (log.isDebugEnabled()) {
log.debug("doGetHash({})[{}] - offset={}, length={}, quick-hash={}",
opcode, (target instanceof CharSequence) ? target : BufferUtils.toHex(BufferUtils.EMPTY_HEX_SEPARATOR, (byte[]) target),
offset, length, BufferUtils.toHex(':', quickHash));
}
buffer = checkExtendedReplyBuffer(receive(sendExtendedCommand(buffer)));
if (buffer == null) {
throw new StreamCorruptedException("Missing extended reply data");
}
String targetType = buffer.getString();
if (String.CASE_INSENSITIVE_ORDER.compare(targetType, opcode) != 0) {
throw new StreamCorruptedException("Mismatched reply target type: expected=" + opcode + ", actual=" + targetType);
}
byte[] hashValue = buffer.getBytes();
if (log.isDebugEnabled()) {
log.debug("doGetHash({})[{}] - offset={}, length={}, quick-hash={} - result={}",
opcode, target, offset, length,
BufferUtils.toHex(':', quickHash), BufferUtils.toHex(':', hashValue));
}
return hashValue;
}
}