org.gudy.bouncycastle.asn1
Class ASN1InputStream

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

All Implemented Interfaces:

Closeable, DERTags

public class ASN1InputStream
extends 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

Fields inherited from class java.io.FilterInputStream

in

Fields inherited from interface org.gudy.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(InputStream is)

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

Method Summary

protected DERObject	buildObject(int tag, int tagNo, int length) build an object given its tag and the number of bytes to construct it from.
protected void	readFully(byte[] bytes)
protected int	readLength()
DERObject	readObject()

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

Constructor Detail

ASN1InputStream

public ASN1InputStream(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(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 IOException

Throws:

IOException

readFully

protected void readFully(byte[] bytes)
                  throws IOException

Throws:

IOException

buildObject

protected DERObject buildObject(int tag,
                                int tagNo,
                                int length)
                         throws IOException

build an object given its tag and the number of bytes to construct it from.

Throws:

IOException

readObject

public DERObject readObject()
                     throws IOException

Throws:

IOException