iaik.asn1

Class CountingDerInputStream

java.lang.Object

java.io.InputStream

iaik.asn1.DerInputStream

iaik.asn1.CountingDerInputStream

All Implemented Interfaces:

java.io.Closeable, java.lang.AutoCloseable

public class CountingDerInputStream
extends DerInputStream

Extends class DerInputStream to count the number of bytes read from the stream. This class is not thread safe, and counts with a signed 32 bit integer, so the counter will overflow after a maximum of 2,147,483,647 (inclusive) read bytes.

Field Summary

Fields inherited from class iaik.asn1.DerInputStream

APPLICATION, BIT_STRING, BMPString, BOOLEAN, CONSTRUCTED, CONTEXT_SPECIFIC, ENUMERATED, EXTERNAL, GeneralizedTime, GeneralString, IA5String, INTEGER, NULL, NumericString, OBJECT_DESCRIPTOR, OBJECT_ID, OCTET_STRING, PrintableString, PRIVATE, SEQUENCE, SET, T61String, UNIString, UNIVERSAL, UTCTime, UTF8String, VisibleString

Constructor Summary

Constructors

Constructor and Description
CountingDerInputStream(java.io.InputStream is) Creates a new DerInputStream to read data from the specified input stream.

Method Summary

Methods

Modifier and Type	Method and Description
int	getPos() Gets the read position (number of bytes read so far).
int	read() Reads one byte from this InputStream.
int	read(boolean unread) Reads one byte from this InputStream.
int	read(byte[] b, int off, int len) Reads bytes into a portion of an array.
long	skip(long n) Skips n bytes.

Methods inherited from class iaik.asn1.DerInputStream

available, close, getTag, nextIsApplication, nextIsConstructed, nextIsContextSpecific, nextIsPrivate, nextIsUniversal, nextTag, readBitString, readBoolean, readConstructed, readContextSpecific, readContextSpecific, readEOC, readGeneralizedTime, readInteger, readNull, readObjectID, readOctetString, readOctetString, readOctetStringByteArray, readSequence, readSet, readString, readUTCTime, skipObjects

Methods inherited from class java.io.InputStream

mark, markSupported, read, reset

Methods inherited from class java.lang.Object

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

Constructor Detail

CountingDerInputStream

public CountingDerInputStream(java.io.InputStream is)

Creates a new DerInputStream to read data from the specified input stream. The given input stream supplies DER/BER encoded data.

Parameters:

is - the InputStream supplying DER/BER encoded data

Method Detail

read

public int read()
         throws java.io.IOException

Reads one byte from this InputStream. If the length encoding of this InputStream is indefinite no length checking is performed.

Overrides:

read in class DerInputStream

Returns:

the next byte from this InputStream

Throws:

java.io.IOException - if an I/O or a DER decoding error occurs

read

public int read(boolean unread)
         throws java.io.IOException

Reads one byte from this InputStream. If the length encoding of this InputStream is indefinite no length checking is performed. If unread is set to true, the byte is pushed back again.

Overrides:

read in class DerInputStream

Parameters:

unread - true if the byte shall be unread

Returns:

the next byte from this InputStream

Throws:

java.io.IOException - if an I/O or a DER decoding error occurs

read

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

Reads bytes into a portion of an array. If the length encoding of this InputStream is indefinite no length checking is performed.

Overrides:

read in class DerInputStream

Parameters:

b - the byte array to which the data shall be read

off - the start offset of the data

len - the maximum number of bytes to be read

Returns:

the number of bytes actually read, or -1 if no more bytes can be read because the end of the stream already has been reached

Throws:

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

skip

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

Skips n bytes.

Overrides:

skip in class DerInputStream

Parameters:

n - the number of bytes to be skipped

Throws:

java.io.IOException - if an I/O or a DER decoding error occurs

getPos

public int getPos()

Gets the read position (number of bytes read so far).

Returns:

the number of bytes read so far.