com.ksyun.ks3.service.encryption.internal

类 AbstractRepeatableCipherInputStream<T>

java.lang.Object

java.io.InputStream

java.io.FilterInputStream

com.ksyun.ks3.service.encryption.internal.AbstractRepeatableCipherInputStream<T>

所有已实现的接口:

Closeable, AutoCloseable

直接已知子类:

RepeatableCipherInputStream

public abstract class AbstractRepeatableCipherInputStream<T>
extends FilterInputStream

Common base class used to wrap an InputStream with a cipher input stream to encrypt it, and handles resets by attempting to reset on the original, unencrypted data InputStream, and recreate an identical Cipher and identical CipherInputStream on the original data.

It's repeatable if and only if the underlying unencryptedDataStream is repeatable - if the underlying input stream is not repeatable and you're going to buffer to make it repeatable anyways, it makes more sense to do so after wrapping in this object, so we buffer the encrypted data and don't have to bother re-encrypting on retry.

This stream only supports being marked before the first call to read or skip, since it's not possible to rewind the encryption state of a CipherInputStream to an arbitrary point. If you call mark after calling read or skip, it will throw an UnsupportedOperationException.

字段概要

从类继承的字段 java.io.FilterInputStream

in

构造器概要

构造器

限定符	构造器和说明
protected	AbstractRepeatableCipherInputStream(InputStream input, FilterInputStream cipherInputStream, T cipherFactory) Constructs a new repeatable cipher input stream using the specified InputStream as the source data, and the CipherFactory for building Cipher objects.

方法概要

方法

限定符和类型	方法和说明
protected abstract FilterInputStream	createCipherInputStream(InputStream unencryptedDataStream, T cipherFactory)
void	mark(int readlimit)
boolean	markSupported()
int	read()
int	read(byte[] b)
int	read(byte[] b, int off, int len)
void	reset()
long	skip(long n)

从类继承的方法 java.io.FilterInputStream

available, close

从类继承的方法 java.lang.Object

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

构造器详细资料

AbstractRepeatableCipherInputStream

protected AbstractRepeatableCipherInputStream(InputStream input,
                                   FilterInputStream cipherInputStream,
                                   T cipherFactory)

Constructs a new repeatable cipher input stream using the specified InputStream as the source data, and the CipherFactory for building Cipher objects.

参数:

input - The original, unencrypted data stream. This stream should be markable/resetable in order for this class to work correctly.

cipherInputStream - The cipher input stream wrapping the original input stream

cipherFactory - The factory used for creating identical cipher objects when this stream is reset and a new CipherInputStream is needed.

方法详细资料

markSupported

public boolean markSupported()

覆盖:

markSupported 在类中 FilterInputStream

mark

public void mark(int readlimit)

覆盖:

mark 在类中 FilterInputStream

reset

public void reset()
           throws IOException

覆盖:

reset 在类中 FilterInputStream

抛出:

IOException

read

public int read()
         throws IOException

覆盖:

read 在类中 FilterInputStream

抛出:

IOException

read

public int read(byte[] b)
         throws IOException

覆盖:

read 在类中 FilterInputStream

抛出:

IOException

read

public int read(byte[] b,
       int off,
       int len)
         throws IOException

覆盖:

read 在类中 FilterInputStream

抛出:

IOException

skip

public long skip(long n)
          throws IOException

覆盖:

skip 在类中 FilterInputStream

抛出:

IOException

createCipherInputStream

protected abstract FilterInputStream createCipherInputStream(InputStream unencryptedDataStream,
                                        T cipherFactory)