Package software.amazon.awssdk.core.internal.io

Class ChecksumValidatingInputStream

java.lang.Object

java.io.InputStream

software.amazon.awssdk.core.internal.io.ChecksumValidatingInputStream

All Implemented Interfaces:

Closeable, AutoCloseable, Abortable

public class ChecksumValidatingInputStream
extends InputStream
implements Abortable

Stream that will update the Checksum as the data is read. When end of the stream is reached the computed Checksum is validated with Expected checksum.

Constructor Summary

Constructors

Constructor	Description
ChecksumValidatingInputStream(InputStream inputStream, SdkChecksum sdkChecksum, String expectedChecksum)	Creates an input stream using the specified Checksum, input stream, and length.

Method Summary

Modifier and Type	Method	Description
void	abort()
void	close()
int	read()	Reads from the underlying stream.
int	read(byte[] buf, int off, int len)	Reads up to len bytes at a time from the input stream, updates the checksum.
void	reset()	Resets stream state, including the running checksum.

Methods inherited from class java.io.InputStream

available, mark, markSupported, read, skip

Methods inherited from class java.lang.Object

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

Constructor Detail

ChecksumValidatingInputStream

public ChecksumValidatingInputStream(InputStream inputStream,
                                     SdkChecksum sdkChecksum,
                                     String expectedChecksum)

Creates an input stream using the specified Checksum, input stream, and length.

Parameters:

inputStream - the input stream

sdkChecksum - the Checksum implementation

expectedChecksum - the checksum value as seen un .

Method Detail

read

public int read()
         throws IOException

Reads from the underlying stream. If the end of the stream is reached, the running checksum will be appended a byte at a time (1 per read call).

Specified by:

read in class InputStream

Returns:

byte read, if eos has been reached, -1 will be returned.

Throws:

IOException

read

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

Reads up to len bytes at a time from the input stream, updates the checksum. If the end of the stream has been reached the checksum will be appended to the last 4 bytes.

Overrides:

read in class InputStream

Parameters:

buf - buffer to write into

off - offset in the buffer to write to

len - maximum number of bytes to attempt to read.

Returns:

number of bytes written into buf, otherwise -1 will be returned to indicate eos.

Throws:

IOException

reset

public void reset()
           throws IOException

Resets stream state, including the running checksum.

Overrides:

reset in class InputStream

Throws:

IOException

abort

public void abort()

Specified by:

abort in interface Abortable

close

public void close()
           throws IOException

Specified by:

close in interface AutoCloseable

Specified by:

close in interface Closeable

Overrides:

close in class InputStream

Throws:

IOException