Package dap4.dap4lib

Class DeChunkedInputStream

java.lang.Object

java.io.InputStream

dap4.dap4lib.DeChunkedInputStream

All Implemented Interfaces:

Closeable, AutoCloseable

public class DeChunkedInputStream
extends InputStream

This class transforms a chunked input stream to a de-chunked input stream. Given the input stream, produce a ByteBuffer with all chunking information removed. There are two special cases. 1. Error chunk -- cache the error chunk as text and provide accessors to obtain it. 2. DMR -- cache the DMR, whatever the mode, and provide accessors.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
protected static class	DeChunkedInputStream.Chunk
static class	DeChunkedInputStream.State

Field Summary

Fields

Modifier and Type	Field	Description
protected boolean	checksumming
protected DeChunkedInputStream.Chunk	chunk
protected long	crc32
protected Checksum	crc32alg
protected String	dmrtext
protected String	errortext
protected RequestMode	mode
protected ByteOrder	remoteorder
protected DeChunkedInputStream.State	state

Constructor Summary

Constructors

Constructor	Description
DeChunkedInputStream(InputStream src, RequestMode mode)

Method Summary

Modifier and Type	Method	Description
int	available()
void	close()
void	computeChecksum(byte[] b, int offset, int extent)
void	computeChecksum(int b)
long	endChecksum()
byte[]	getCurrentChunk()
String	getDMRText()
String	getErrorText()
ByteOrder	getRemoteOrder()
DeChunkedInputStream.State	getState()
void	mark(int readlimit)
boolean	markSupported()
int	read()
int	read(byte[] b)
int	read(byte[] b, int off, int len)
protected int	readChunk(DeChunkedInputStream.Chunk chunk)
protected int	readDMR(DeChunkedInputStream.Chunk chunk)
protected boolean	readHeader(DeChunkedInputStream.Chunk chunk)	Read the size+flags header from the input source and use it to initialize the chunk state
void	reset()
long	skip(long n)
void	startChecksum()

Methods inherited from class java.io.InputStream

nullInputStream, readAllBytes, readNBytes, readNBytes, transferTo

Methods inherited from class java.lang.Object

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

Field Detail

mode

protected RequestMode mode

remoteorder

protected ByteOrder remoteorder

state

protected DeChunkedInputStream.State state

chunk

protected DeChunkedInputStream.Chunk chunk

crc32alg

protected Checksum crc32alg

crc32

protected long crc32

checksumming

protected boolean checksumming

errortext

protected String errortext

dmrtext

protected String dmrtext

Constructor Detail

DeChunkedInputStream

public DeChunkedInputStream(InputStream src,
                            RequestMode mode)
                     throws IOException

Throws:

IOException

Method Detail

available

public int available()
              throws IOException

Overrides:

available in class InputStream

Throws:

IOException

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

mark

public void mark(int readlimit)

Overrides:

mark in class InputStream

reset

public void reset()
           throws IOException

Overrides:

reset in class InputStream

Throws:

IOException

markSupported

public boolean markSupported()

Overrides:

markSupported in class InputStream

read

public int read()
         throws IOException

Specified by:

read in class InputStream

Throws:

IOException

read

public int read(byte[] b)
         throws IOException

Overrides:

read in class InputStream

Throws:

IOException

read

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

Overrides:

read in class InputStream

Throws:

IOException

skip

public long skip(long n)
          throws IOException

Overrides:

skip in class InputStream

Throws:

IOException

getState

public DeChunkedInputStream.State getState()

getErrorText

public String getErrorText()

getDMRText

public String getDMRText()

getCurrentChunk

public byte[] getCurrentChunk()
                       throws IOException

Throws:

IOException

getRemoteOrder

public ByteOrder getRemoteOrder()

readChunk

protected int readChunk(DeChunkedInputStream.Chunk chunk)
                 throws IOException

Throws:

IOException

readDMR

protected int readDMR(DeChunkedInputStream.Chunk chunk)
               throws IOException

Throws:

IOException

readHeader

protected boolean readHeader(DeChunkedInputStream.Chunk chunk)
                      throws IOException

Read the size+flags header from the input source and use it to initialize the chunk state

Returns:

true if header read false if immediate eof encountered or chunk is too short

Throws:

IOException

startChecksum

public void startChecksum()

computeChecksum

public void computeChecksum(byte[] b,
                            int offset,
                            int extent)

computeChecksum

public void computeChecksum(int b)

endChecksum

public long endChecksum()