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## org.bouncycastle.asn1
Class ASN1InputStream

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

All Implemented Interfaces:
  BERTags

public class ASN1InputStream
extends java.io.FilterInputStream
implements BERTags

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.bouncycastle.asn1.BERTags
`APPLICATION, BIT_STRING, BMP_STRING, BOOLEAN, CONSTRUCTED, CONTEXT_SPECIFIC, DATE, DATE_TIME, DURATION, EMBEDDED_PDV, ENUMERATED, EXTERNAL, FLAGS, GENERAL_STRING, GENERALIZED_TIME, GRAPHIC_STRING, IA5_STRING, INTEGER, NULL, NUMERIC_STRING, OBJECT_DESCRIPTOR, OBJECT_IDENTIFIER, OBJECT_IDENTIFIER_IRI, OCTET_STRING, PRINTABLE_STRING, PRIVATE, REAL, RELATIVE_OID, RELATIVE_OID_IRI, SEQUENCE, SEQUENCE_OF, SET, SET_OF, T61_STRING, TAGGED, TIME, TIME_OF_DAY, UNIVERSAL, UNIVERSAL_STRING, UNRESTRICTED_STRING, UTC_TIME, UTF8_STRING, VIDEOTEX_STRING, VISIBLE_STRING`

Constructor Summary
`ASN1InputStream(byte[] input)` Create an ASN1InputStream based on the input byte array.
`ASN1InputStream(byte[] input, boolean lazyEvaluate)` Create an ASN1InputStream based on the input byte array.
`ASN1InputStream(java.io.InputStream is)`
`ASN1InputStream(java.io.InputStream input, boolean lazyEvaluate)` Create an ASN1InputStream where no DER object will be longer than limit, and constructed objects such as sequences will be parsed lazily.
`ASN1InputStream(java.io.InputStream input, int limit)` Create an ASN1InputStream where no DER object will be longer than limit.
`ASN1InputStream(java.io.InputStream input, int limit, boolean lazyEvaluate)` Create an ASN1InputStream where no DER object will be longer than limit, and constructed objects such as sequences will be parsed lazily.

Method Summary
`protected ASN1Primitive` | `buildObject(int tag, int tagNo, int length)` build an object given its tag and the number of bytes to construct it from.
`protected int` | `getLimit()`
`protected void` | `readFully(byte[] bytes)`
`protected int` | `readLength()`
`ASN1Primitive` | `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(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(byte[] input,
                           boolean lazyEvaluate)

  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.
  `lazyEvaluate` - true if parsing inside constructed objects can be delayed.

### 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.

### ASN1InputStream

    public ASN1InputStream(java.io.InputStream input,
                           boolean lazyEvaluate)

  Create an ASN1InputStream where no DER object will be longer than limit, and constructed objects such as sequences will be parsed lazily.

Parameters:
  `input` - stream containing ASN.1 encoded data.
  `lazyEvaluate` - true if parsing inside constructed objects can be delayed.

### ASN1InputStream

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

  Create an ASN1InputStream where no DER object will be longer than limit, and constructed objects such as sequences will be parsed lazily.

Parameters:
  `input` - stream containing ASN.1 encoded data.
  `limit` - maximum size of a DER encoded object.
  `lazyEvaluate` - true if parsing inside constructed objects can be delayed.

Method Detail

### getLimit

    protected int getLimit()

### 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 ASN1Primitive buildObject(int tag,
                                        int tagNo,
                                        int length)
                                 throws java.io.IOException

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

  Parameters:
    `tag` - the full tag details.
    `tagNo` - the tagNo defined.
    `length` - the length of the object.
  Returns:
    the resulting primitive.
  Throws:
    `java.io.IOException` - on processing exception.

### readObject

    public ASN1Primitive readObject()
                             throws java.io.IOException

  Throws:
    `java.io.IOException`

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