iaik.utils
Class ASN1InputStream

java.lang.Object
  |
  +--java.io.InputStream
        |
        +--java.io.FilterInputStream
              |
              +--iaik.utils.Base64InputStream
                    |
                    +--iaik.utils.ASN1InputStream

public class ASN1InputStream

extends Base64InputStream

This Filter-InputStream can be used to read a lot of different formats for ASN.1 objects. The data which can be read from this stream is always binary DER encoded ASN.1!

The following formats have been tested:

• one or more binary DER encoded ASN.1 objects

   0x30 0x82 0x03 0xE9 ...

• one or more Base64/DER encoded ASN.1 objects

   MIIB2zCCAUQCBQC3xiKfMA0GCSqGSIb3DQEBBAUAMDUxCzAJBgNVBAYTAkFUMQ0w
   ...
   PZm5TIGAxUXR96AalaJwvG8wdk+l3t1BmMI6
   MIIB2zCCAUQCBQC3xiKfMA0GCSqGSIb3DQEBBAUAMDUxCzAJBgNVBAYTAkFUMQ0w
   ...
   Sk03xc18zfv5DhZ8Vuz3Nk1qgi1mPq0krImanGtFtBszSSnmpNW08ujUTvGHhDk=
   

• one or more Base64/DER encoded ASN.1 objects with BEGIN/END

   -----BEGIN CERTIFICATE-----
   MIIB9zCCAWACBEZWm84wDQYJKoZIhvcNAQEEBQAwNTELMAkGA1UEBhMCQVQxDTAL
   ...
   PZm5TIGAxUXR96AalaJwvG8wdk+l3t1BmMI6
   -----END CERTIFICATE-----
   -----BEGIN CERTIFICATE-----
   MIIB2zCCAUQCBQC3xiKfMA0GCSqGSIb3DQEBBAUAMDUxCzAJBgNVBAYTAkFUMQ0w
   ...
   Sk03xc18zfv5DhZ8Vuz3Nk1qgi1mPq0krImanGtFtBszSSnmpNW08ujUTvGHhDk=
   -----END CERTIFICATE-----

Version:

File Revision 12

Fields inherited from class iaik.utils.Base64InputStream

decoding, ERROR, IGNORE, NOTIFY

Fields inherited from class java.io.FilterInputStream

in

Constructor Summary

ASN1InputStream(InputStream is)
Creates a new ASN1InputStream to read data from the specified input stream.

Method Summary

int	available() Returns the number of bytes that can be read from this input stream without blocking.
protected void	notify(byte[] buffer) Called by super class if a '-' shall be decoded.
int	read() Reads the next byte of data from this input stream.
int	read(byte[] b, int off, int len) Reads up to len bytes of data from this input stream into an array of bytes.

Methods inherited from class iaik.utils.Base64InputStream

setIgnoreInvalidCharacters

Methods inherited from class java.io.FilterInputStream

close, mark, markSupported, 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)
                throws IOException

Creates a new ASN1InputStream to read data from the specified input stream.

Parameters:

is - the underlying input stream

Throws:

IOException - if an I/O error occurs during reading from the stream

Method Detail

notify

protected void notify(byte[] buffer)
               throws IOException

Called by super class if a '-' shall be decoded.

Overrides:

notify in class Base64InputStream

Following copied from class: iaik.utils.Base64InputStream

Parameters:

buffer - the characters already read from the input stream; and the first one was marked with NOTIFY

Throws:

IOException - allows the subclass to throw an Exception if an error occurs

read

public int read()
         throws IOException

Reads the next byte of data from this input stream.

Overrides:

read in class Base64InputStream

Returns:

the next byte of data, or -1 if the end of the stream is reached

Throws:

IOException - if an I/O error occurs

read

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

Reads up to len bytes of data from this input stream into an array of bytes.

Overrides:

read in class Base64InputStream

Parameters:

b - the buffer into which the data is read

off - the start offset of the data

len - the maximum number of bytes read

Returns:

the total number of bytes read into the buffer, or -1 if there is no more data because the end of the stream has been reached

Throws:

IOException - if an I/O error occurs

available

public int available()
              throws IOException

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

Overrides:

available in class FilterInputStream

Returns:

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

Throws:

IOException - if an I/O error occurs