Package com.mku.salmonfs.streams

Class AesFileInputStream

java.lang.Object

java.io.InputStream

com.mku.streams.InputStreamWrapper

com.mku.salmonfs.streams.AesFileInputStream

All Implemented Interfaces:

java.io.Closeable, java.lang.AutoCloseable

public class AesFileInputStream
extends InputStreamWrapper

InputStream wrapper for seeking and reading an encrypted AesFile. This class provides a seekable source with parallel streams and cached buffers for performance.

Field Summary

Fields inherited from class com.mku.streams.InputStreamWrapper

DEFAULT_BACK_OFFSET, DEFAULT_BUFFER_SIZE, DEFAULT_BUFFERS, MAX_BUFFERS

Constructor Summary

Constructors

Constructor	Description
AesFileInputStream(AesFile salmonFile)	Instantiate a seekable stream from an encrypted file source
AesFileInputStream(AesFile salmonFile, int buffersCount, int bufferSize, int threads, int backOffset)	Instantiate a seekable stream from an encrypted file source

Method Summary

Modifier and Type	Method	Description
void	close()	Close the stream and associated backed streams and clear buffers.
protected int	fillBuffer(Buffer cacheBuffer, long startPosition, int length)	Fills a cache buffer with the decrypted data from the encrypted source file.

Methods inherited from class com.mku.streams.InputStreamWrapper

fillBufferPart, getAlignSize, getBackOffset, getBuffersCount, getBufferSize, getLength, getPositionEnd, getPositionStart, getTotalSize, read, read, reset, setBackOffset, setBuffersCount, setPositionEnd, setPositionStart, setTotalSize, skip

Methods inherited from class java.io.InputStream

available, mark, markSupported, nullInputStream, read, readAllBytes, readNBytes, readNBytes, transferTo

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

AesFileInputStream

public AesFileInputStream(AesFile salmonFile)
                   throws java.io.IOException

Instantiate a seekable stream from an encrypted file source

Parameters:

salmonFile - The source file.

Throws:

java.io.IOException - Thrown if there is an IO error.

AesFileInputStream

public AesFileInputStream(AesFile salmonFile,
                          int buffersCount,
                          int bufferSize,
                          int threads,
                          int backOffset)
                   throws java.io.IOException

Instantiate a seekable stream from an encrypted file source

Parameters:

salmonFile - The source file.

buffersCount - Number of buffers to use.

bufferSize - The length of each buffer.

threads - The number of threads/streams to source the file in parallel.

backOffset - The back offset.

Throws:

java.io.IOException - Thrown if there is an IO error.

Method Detail

fillBuffer

protected int fillBuffer(Buffer cacheBuffer,
                         long startPosition,
                         int length)
                  throws java.io.IOException

Fills a cache buffer with the decrypted data from the encrypted source file.

Overrides:

fillBuffer in class InputStreamWrapper

Parameters:

cacheBuffer - The cache buffer that will store the decrypted contents

startPosition - The start position

length - The length of the data requested

Returns:

The number of bytes read

Throws:

java.io.IOException - When IO error occurs

close

public void close()
           throws java.io.IOException

Close the stream and associated backed streams and clear buffers.

Specified by:

close in interface java.lang.AutoCloseable

Specified by:

close in interface java.io.Closeable

Overrides:

close in class InputStreamWrapper

Throws:

java.io.IOException - Thrown if there is an IO error.