com.objsys.asn1j.runtime

Class Asn1DerInputStream

java.lang.Object

com.objsys.asn1j.runtime.Asn1MessageBufferBase

com.objsys.asn1j.runtime.Asn1MessageBuffer

com.objsys.asn1j.runtime.Asn1DecodeBuffer

com.objsys.asn1j.runtime.Asn1BerDecodeBuffer

com.objsys.asn1j.runtime.Asn1DerDecodeBuffer

com.objsys.asn1j.runtime.Asn1DerInputStream

All Implemented Interfaces:

Asn1InputStream

public class Asn1DerInputStream
extends Asn1DerDecodeBuffer
implements Asn1InputStream

This class handles the input stream for the decoding of ASN.1 messages as specified in the Distinguished Encoding Rules (DER) as documented in the ITU-T X.690 standard.

Field Summary

Fields inherited from class com.objsys.asn1j.runtime.Asn1DecodeBuffer

mByteCount

Fields inherited from class com.objsys.asn1j.runtime.Asn1MessageBufferBase

context, mTypeCode

Constructor Summary

Constructors

Constructor and Description
Asn1DerInputStream(java.io.InputStream istream) This constructor creates a DER decode buffer object that references an encoded ASN.1 message.

Method Summary

Modifier and Type	Method and Description
int	available() Returns the number of bytes that can be read (or skipped over) from this input stream without blocking by the next caller of a method for this input stream.
void	close() Closes this input stream and releases any system resources associated with the stream.
void	mark(int readLimit) This method is used to mark the current position in the input stream for retry processing.
boolean	markSupported() Tests if this input stream supports the mark and reset methods.
void	reset() This method is used to reset the current position in the input stream back to the location of the last 'mark' call.
long	skip(long nbytes) This method will skip over the requested number of bytes in the input stream.

Methods inherited from class com.objsys.asn1j.runtime.Asn1BerDecodeBuffer

calcIndefLen, decodeEnumValue, decodeEnumValue, decodeLength, decodeOpenType, decodeOpenType, decodeTag, decodeTagAndLength, getLastTag, handleException, matchTag, matchTag, matchTag, movePastEOC, parse, peekTag, peekTag, readByte, setExceptionHandler, skipTLV, throwIfUnhandled

Methods inherited from class com.objsys.asn1j.runtime.Asn1DecodeBuffer

addCaptureBuffer, capture, decodeIntValue, decodeOIDContents, decodeOIDContentsBig, decodeRelOIDContents, decodeRelOIDContentsBig, getByteCount, getInputStream, getLazyOpenTypeDecode, hexDump, init, read, read, read, read2Bytes, read4Bytes, removeCaptureBuffer, setInputStream, setLazyOpenTypeDecode, skipOIDContents, skipRelOIDContents

Methods inherited from class com.objsys.asn1j.runtime.Asn1MessageBuffer

addNamedEventHandler, getEventHandlerListCount, hasEventHandlers, invokeCharacters, invokeEndElement, invokeStartElement, setEventHandlerList

Methods inherited from class com.objsys.asn1j.runtime.Asn1MessageBufferBase

getContext, hexDump, hexDump, setKey, setTypeCode

Methods inherited from class java.lang.Object

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

Constructor Detail

Asn1DerInputStream

public Asn1DerInputStream(java.io.InputStream istream)

This constructor creates a DER decode buffer object that references an encoded ASN.1 message. In this case, the message is passed in using an InputStream object.

Parameters:

istream - Input stream containing an encoded ASN.1 message.

Method Detail

available

public int available()
              throws java.io.IOException

Returns the number of bytes that can be read (or skipped over) from this input stream without blocking by the next caller of a method for this input stream. The next caller might be the same thread or or another thread.

Specified by:

available in interface Asn1InputStream

Returns:

the number of bytes that can be read from this input stream without blocking.

Throws:

java.io.IOException - if an I/O error occurs.

close

public void close()
           throws java.io.IOException

Closes this input stream and releases any system resources associated with the stream.

Specified by:

close in interface Asn1InputStream

Throws:

java.io.IOException - if an I/O error occurs.

mark

public void mark(int readLimit)

This method is used to mark the current position in the input stream for retry processing. It is equivalent to the Java InputStream 'mark' method.

Specified by:

mark in interface Asn1InputStream

Overrides:

mark in class Asn1DecodeBuffer

Parameters:

readLimit - Max number of bytes that can be read before mark becomes invalid.

markSupported

public boolean markSupported()

Tests if this input stream supports the mark and reset methods. The markSupported method of InputStream returns false.

Specified by:

markSupported in interface Asn1InputStream

Returns:

true if this true type supports the mark and reset method; false otherwise.

reset

public void reset()

This method is used to reset the current position in the input stream back to the location of the last 'mark' call. It is equivalent to the Java InputStream 'reset' method.

Specified by:

reset in interface Asn1InputStream

Overrides:

reset in class Asn1DecodeBuffer

skip

public long skip(long nbytes)
          throws java.io.IOException

This method will skip over the requested number of bytes in the input stream.

Specified by:

skip in interface Asn1InputStream

Overrides:

skip in class Asn1DecodeBuffer

Parameters:

nbytes - Number of bytes to skip

Returns:

the actual number of bytes skipped.

Throws:

java.io.IOException - if an I/O error occurs.