com.google.android.exoplayer2.upstream.crypto

Class AesCipherDataSink

java.lang.Object

com.google.android.exoplayer2.upstream.crypto.AesCipherDataSink

All Implemented Interfaces:

DataSink

public final class AesCipherDataSink
extends java.lang.Object
implements DataSink

A wrapping DataSink that encrypts the data being consumed.

Nested Class Summary

Nested classes/interfaces inherited from interface com.google.android.exoplayer2.upstream.DataSink

DataSink.Factory

Constructor Summary

Constructors

Constructor and Description
AesCipherDataSink(byte[] secretKey, DataSink wrappedDataSink) Create an instance whose write methods have the side effect of overwriting the input data.
AesCipherDataSink(byte[] secretKey, DataSink wrappedDataSink, byte[] scratch) Create an instance whose write methods are free of side effects.

Method Summary

Modifier and Type	Method and Description
void	close() Closes the sink.
void	open(DataSpec dataSpec) Opens the sink to consume the specified data.
void	write(byte[] data, int offset, int length) Consumes the provided data.

Methods inherited from class java.lang.Object

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

Constructor Detail

AesCipherDataSink

public AesCipherDataSink(byte[] secretKey,
                         DataSink wrappedDataSink)

Create an instance whose write methods have the side effect of overwriting the input data. Use this constructor for maximum efficiency in the case that there is no requirement for the input data arrays to remain unchanged.

Parameters:

secretKey - The key data.

wrappedDataSink - The wrapped DataSink.

AesCipherDataSink

public AesCipherDataSink(byte[] secretKey,
                         DataSink wrappedDataSink,
                         byte[] scratch)

Create an instance whose write methods are free of side effects. Use this constructor when the input data arrays are required to remain unchanged.

Parameters:

secretKey - The key data.

wrappedDataSink - The wrapped DataSink.

scratch - Scratch space. Data is decrypted into this array before being written to the wrapped DataSink. It should be of appropriate size for the expected writes. If a write is larger than the size of this array the write will still succeed, but multiple cipher calls will be required to complete the operation.

Method Detail

open

public void open(DataSpec dataSpec)
          throws java.io.IOException

Description copied from interface: DataSink

Opens the sink to consume the specified data.

Specified by:

open in interface DataSink

Parameters:

dataSpec - Defines the data to be consumed.

Throws:

java.io.IOException - If an error occurs opening the sink.

write

public void write(byte[] data,
                  int offset,
                  int length)
           throws java.io.IOException

Description copied from interface: DataSink

Consumes the provided data.

Specified by:

write in interface DataSink

Parameters:

data - The buffer from which data should be consumed.

offset - The offset of the data to consume in buffer.

length - The length of the data to consume, in bytes.

Throws:

java.io.IOException - If an error occurs writing to the sink.

close

public void close()
           throws java.io.IOException

Description copied from interface: DataSink

Closes the sink.

Specified by:

close in interface DataSink

Throws:

java.io.IOException - If an error occurs closing the sink.