com.amazonaws.services.s3.internal.crypto.RenewableCipherLiteInputStream Maven / Gradle / Ivy
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/*
* Copyright 2013-2016 Amazon.com, Inc. or its affiliates. All Rights Reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License").
* You may not use this file except in compliance with the License.
* A copy of the License is located at
*
* http://aws.amazon.com/apache2.0
*
* or in the "license" file accompanying this file. This file 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 com.amazonaws.services.s3.internal.crypto;
import java.io.IOException;
import java.io.InputStream;
/**
* A specific kind of {@link CipherLiteInputStream} that supports partial
* mark-and-reset in the sense that, if the underlying input stream supports
* mark-and-reset, this input stream can then be marked at and get reset back to
* the very beginning of the stream (but not anywhere else).
*/
public final class RenewableCipherLiteInputStream extends CipherLiteInputStream {
private boolean hasBeenAccessed;
public RenewableCipherLiteInputStream(InputStream is, CipherLite cipherLite) {
super(is, cipherLite);
}
public RenewableCipherLiteInputStream(InputStream is, CipherLite c,
int buffsize) {
super(is, c, buffsize);
}
public RenewableCipherLiteInputStream(InputStream is, CipherLite c,
int buffsize, boolean multipart, boolean lastMultiPart) {
super(is, c, buffsize, multipart, lastMultiPart);
}
protected RenewableCipherLiteInputStream(InputStream is) {
super(is);
}
/**
* Mark and reset is currently only partially supported, in the sense that,
* if the underlying input stream supports mark-and-reset, this input stream
* can then be marked at and get reset back to the very beginning of the
* stream (but not anywhere else).
*/
@Override
public boolean markSupported() {
abortIfNeeded();
return in.markSupported();
}
/**
* Mark and reset is currently only partially supported, in the sense that,
* if the underlying input stream supports mark-and-reset, this input stream
* can then be marked at and get reset back to the very beginning of the
* stream (but not anywhere else).
*
* @throws UnsupportedOperationException
* if mark is called after this stream has been accessed.
*/
@Override
public void mark(final int readlimit) {
abortIfNeeded();
if (hasBeenAccessed) {
throw new UnsupportedOperationException(
"Marking is only supported before your first call to "
+ "read or skip.");
}
in.mark(readlimit);
}
/**
* Resets back to the very beginning of the stream.
*
* Mark and reset is currently only partially supported, in the sense that,
* if the underlying input stream supports mark-and-reset, this input stream
* can then be marked at and get reset back to the very beginning of the
* stream (but not anywhere else).
*/
@Override
public void reset() throws IOException {
abortIfNeeded();
in.reset();
renewCipherLite();
resetInternal();
hasBeenAccessed = false;
}
@Override
public int read() throws IOException {
hasBeenAccessed = true;
return super.read();
}
@Override
public int read(final byte[] b) throws IOException {
hasBeenAccessed = true;
return super.read(b);
}
@Override
public int read(final byte[] b, final int off, final int len)
throws IOException {
hasBeenAccessed = true;
return super.read(b, off, len);
}
@Override
public long skip(final long n) throws IOException {
hasBeenAccessed = true;
return super.skip(n);
}
}