org.bouncycastle.asn1
Class ASN1InputStream

java.lang.Object
  java.io.InputStream
      java.io.FilterInputStream
          org.bouncycastle.asn1.ASN1InputStream

All Implemented Interfaces:

java.io.Closeable, DERTags

public class ASN1InputStream
extends java.io.FilterInputStream
implements DERTags

a general purpose ASN.1 decoder - note: this class differs from the others in that it returns null after it has read the last object in the stream. If an ASN.1 NULL is encountered a DER/BER Null object is returned.

Field Summary

private static DERObject	END_OF_STREAM
(package private) boolean	eofFound
(package private) int	limit

Fields inherited from class java.io.FilterInputStream

in

Fields inherited from interface org.bouncycastle.asn1.DERTags

APPLICATION, BIT_STRING, BMP_STRING, BOOLEAN, CONSTRUCTED, ENUMERATED, EXTERNAL, GENERAL_STRING, GENERALIZED_TIME, GRAPHIC_STRING, IA5_STRING, INTEGER, NULL, NUMERIC_STRING, OBJECT_IDENTIFIER, OCTET_STRING, PRINTABLE_STRING, SEQUENCE, SEQUENCE_OF, SET, SET_OF, T61_STRING, TAGGED, UNIVERSAL_STRING, UTC_TIME, UTF8_STRING, VIDEOTEX_STRING, VISIBLE_STRING

Constructor Summary

ASN1InputStream(byte[] input)
Create an ASN1InputStream based on the input byte array.

ASN1InputStream(java.io.InputStream is)

ASN1InputStream(java.io.InputStream input, int limit)
Create an ASN1InputStream where no DER object will be longer than limit.

Method Summary

private BERConstructedOctetString	buildConstructedOctetString()
private BERConstructedOctetString	buildDerConstructedOctetString(byte[] input)
protected DERObject	buildObject(int tag, int tagNo, byte[] bytes) build an object given its tag and a byte stream to construct it from.
protected void	readFully(byte[] bytes)
private byte[]	readIndefiniteLengthFully() read a string of bytes representing an indefinite length object.
protected int	readLength()
DERObject	readObject()
private int	readTagNumber(int tag)

Methods inherited from class java.io.FilterInputStream

available, close, mark, markSupported, read, read, read, reset, skip

Methods inherited from class java.lang.Object

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

Field Detail

END_OF_STREAM

private static final DERObject END_OF_STREAM

eofFound

boolean eofFound

limit

int limit

Constructor Detail

ASN1InputStream

public ASN1InputStream(java.io.InputStream is)

ASN1InputStream

public ASN1InputStream(byte[] input)

Create an ASN1InputStream based on the input byte array. The length of DER objects in the stream is automatically limited to the length of the input array.

Parameters:

input - array containing ASN.1 encoded data.

ASN1InputStream

public ASN1InputStream(java.io.InputStream input,
                       int limit)

Create an ASN1InputStream where no DER object will be longer than limit.

Parameters:

input - stream containing ASN.1 encoded data.

limit - maximum size of a DER encoded object.

Method Detail

readLength

protected int readLength()
                  throws java.io.IOException

Throws:

java.io.IOException

readFully

protected void readFully(byte[] bytes)
                  throws java.io.IOException

Throws:

java.io.IOException

buildObject

protected DERObject buildObject(int tag,
                                int tagNo,
                                byte[] bytes)
                         throws java.io.IOException

build an object given its tag and a byte stream to construct it from.

Throws:

java.io.IOException

readIndefiniteLengthFully

private byte[] readIndefiniteLengthFully()
                                  throws java.io.IOException

read a string of bytes representing an indefinite length object.

Throws:

java.io.IOException

buildConstructedOctetString

private BERConstructedOctetString buildConstructedOctetString()
                                                       throws java.io.IOException

Throws:

java.io.IOException

buildDerConstructedOctetString

private BERConstructedOctetString buildDerConstructedOctetString(byte[] input)
                                                          throws java.io.IOException

Throws:

java.io.IOException

readObject

public DERObject readObject()
                     throws java.io.IOException

Throws:

java.io.IOException

readTagNumber

private int readTagNumber(int tag)
                   throws java.io.IOException

Throws:

java.io.IOException