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HADOOP-10653. Add a new constructor for CryptoInputStream that receives current position of wrapped stream. Contributed by Yi Liu

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git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/fs-encryption@1599228 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Yi Liu 2014-06-02 14:35:32 +00:00
parent 871616b993
commit 75ec5792df
3 changed files with 24 additions and 3 deletions
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3
hadoop-common-project/hadoop-common/CHANGES-fs-encryption.txt
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@ -21,6 +21,9 @@ fs-encryption (Unreleased)
HADOOP-10635. Add a method to CryptoCodec to generate SRNs for IV. (Yi Liu)
HADOOP-10653. Add a new constructor for CryptoInputStream that
receives current position of wrapped stream. (Yi Liu)
OPTIMIZATIONS
BUG FIXES

10
hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/crypto/CryptoInputStream.java
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@ -102,18 +102,22 @@ public class CryptoInputStream extends FilterInputStream implements
public CryptoInputStream(InputStream in, CryptoCodec codec,
int bufferSize, byte[] key, byte[] iv) throws IOException {
this(in, codec, bufferSize, key, iv,
CryptoStreamUtils.getInputStreamOffset(in));
}
public CryptoInputStream(InputStream in, CryptoCodec codec,
int bufferSize, byte[] key, byte[] iv, long streamOffset) throws IOException {
super(in);
this.bufferSize = CryptoStreamUtils.checkBufferSize(codec, bufferSize);
this.codec = codec;
this.key = key.clone();
this.initIV = iv.clone();
this.iv = iv.clone();
this.streamOffset = streamOffset;
inBuffer = ByteBuffer.allocateDirect(this.bufferSize);
outBuffer = ByteBuffer.allocateDirect(this.bufferSize);
decryptor = getDecryptor();
if (in instanceof Seekable) {
streamOffset = ((Seekable) in).getPos();
}
resetStreamOffset(streamOffset);
}

14
hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/crypto/CryptoStreamUtils.java
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@ -20,10 +20,13 @@
import static org.apache.hadoop.fs.CommonConfigurationKeysPublic.HADOOP_SECURITY_CRYPTO_BUFFER_SIZE_DEFAULT;
import static org.apache.hadoop.fs.CommonConfigurationKeysPublic.HADOOP_SECURITY_CRYPTO_BUFFER_SIZE_KEY;
import java.io.IOException;
import java.io.InputStream;
import java.nio.ByteBuffer;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.Seekable;
import com.google.common.base.Preconditions;
@ -52,4 +55,15 @@ public static int checkBufferSize(CryptoCodec codec, int bufferSize) {
"Minimum value of buffer size is " + MIN_BUFFER_SIZE + ".");
return bufferSize - bufferSize % codec.getAlgorithmBlockSize();
}
/**
* If input stream is {@link org.apache.hadoop.fs.Seekable}, return it's
* current position, otherwise return 0;
*/
public static long getInputStreamOffset(InputStream in) throws IOException {
if (in instanceof Seekable) {
return ((Seekable) in).getPos();
}
return 0;
}
}