BerInputStream
extends Object| java.lang.Object | |
| ↳ | com.microstrategy.utils.BerInputStream |
 Known Direct Subclasses
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Class Overview
Decodes ASN.1 types encoded with BER (X.690)
Summary
| Constants | |||||||||||
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| int | INDEFINIT_LENGTH | Indicates indefinite length of the current type | |||||||||
| Fields | |||||||||||
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| protected byte[] | buffer | Internal buffer for storing encoded array | |||||||||
| public int | choiceIndex | The last choice index | |||||||||
| public Object | content | Current decoded content | |||||||||
| protected int | contentOffset | Current decoded content offset | |||||||||
| protected InputStream | in | Associated InputStream
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| protected boolean | isIndefinedLength | Indicates defined or indefined reading mode for associated InputStream. | |||||||||
| protected boolean | isVerify | Indicates verify or store mode. | |||||||||
| protected int | length | Current decoded length | |||||||||
| protected int | offset | The position in the buffer. | |||||||||
| public int | oidElement | ||||||||||
| public int | tag | Current decoded tag | |||||||||
| protected int | tagOffset | Current decoded tag offset | |||||||||
| public int[] | times | Keeps last decoded: year, month, day, hour, minute, second, millisecond | |||||||||
| Public Constructors | |||||||||||
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BerInputStream(InputStream in)
Creates stream for decoding.
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BerInputStream(InputStream in, int initialSize)
Creates stream for decoding.
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| Public Methods | |||||||||||
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| void |
compactBuffer()
Reallocates the buffer in order to make it
exactly the size of data it contains
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| Object | get(Object key) | ||||||||||
| final byte[] |
getBuffer()
Returns internal buffer used for decoding
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| final int | getContentOffset() | ||||||||||
| byte[] |
getEncoded()
Returns encoded array.
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| final int |
getEndOffset()
Returns end offset for the current encoded type
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| final int |
getLength()
Returns length of the current content for decoding
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| static int |
getLength(byte[] encoding)
Returns the length of the encoding
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| final int |
getOffset()
Returns the current offset
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| final int |
getTagOffset()
Returns start offset for the current encoded type
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| int |
next()
Decodes next encoded type.
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| void | put(Object key, Object entry) | ||||||||||
| void |
readBitString()
Decodes ASN.1 bitstring type
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| void |
readBoolean()
Decodes ASN.1 boolean type
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| void |
readContent()
Reads the next encoded content from the encoded input stream.
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| void |
readEnumerated()
Decodes ASN.1 Enumerated type
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| void |
readOID()
Decodes ASN.1 ObjectIdentifier type
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| void |
readOctetString()
Decodes ASN.1 Octetstring type
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| final void |
setVerify()
Sets verify mode.
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| Protected Methods | |||||||||||
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| int |
read()
Reads the next encoded byte from the encoded input stream.
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[Expand]
Inherited Methods | |||||||||||
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From class
java.lang.Object
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Constants
protected static final int INDEFINIT_LENGTH
Indicates indefinite length of the current type
Fields
protected byte[] buffer
Internal buffer for storing encoded array
public int choiceIndex
The last choice index
public Object content
Current decoded content
protected int contentOffset
Current decoded content offset
protected InputStream in
Associated InputStream
protected boolean isIndefinedLength
Indicates defined or indefined reading mode for associated InputStream. This mode is defined by reading a length for a first ASN.1 type from InputStream.
protected boolean isVerify
Indicates verify or store mode.
In store mode a decoded content is stored in a newly allocated
appropriate object. The content variable holds
a reference to the last created object.
In verify mode a decoded content is not stored.
protected int length
Current decoded length
protected int offset
The position in the buffer. Next read must place data into the buffer from this offset
public int oidElement
public int tag
Current decoded tag
protected int tagOffset
Current decoded tag offset
public int[] times
Keeps last decoded: year, month, day, hour, minute, second, millisecond
Public Constructors
public BerInputStream (InputStream in)
Creates stream for decoding. Allocates initial buffer of default size
Parameters
| in | is associated InputStream
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Throws
| IOException |
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public BerInputStream (InputStream in, int initialSize)
Creates stream for decoding.
Allocates initial buffer of initialSize size
Parameters
| in | is associated InputStream |
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| initialSize | the internal buffer initial size |
Throws
| IOException |
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Public Methods
public void compactBuffer ()
Reallocates the buffer in order to make it exactly the size of data it contains
public Object get (Object key)
public final byte[] getBuffer ()
Returns internal buffer used for decoding
Returns
- - buffer
public final int getContentOffset ()
public byte[] getEncoded ()
Returns encoded array. MUST be invoked after decoding corresponding ASN.1 notation
public final int getEndOffset ()
Returns end offset for the current encoded type
Returns
- - offset
public final int getLength ()
Returns length of the current content for decoding
Returns
- - length of content
public static int getLength (byte[] encoding)
Returns the length of the encoding
public final int getOffset ()
Returns the current offset
Returns
- - offset
public final int getTagOffset ()
Returns start offset for the current encoded type
Returns
- - offset
public int next ()
Decodes next encoded type. Initializes tag, length, tagOffset and contentOffset variables
Returns
- next decoded tag
Throws
| IOException | - if error occured |
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public void put (Object key, Object entry)
public void readBitString ()
Decodes ASN.1 bitstring type
Throws
| IOException | - if error occured |
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public void readBoolean ()
Decodes ASN.1 boolean type
Throws
| IOException | - if error occured |
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public void readContent ()
Reads the next encoded content from the encoded input stream. The method MUST be used for reading a primitive encoded content.
Throws
| IOException | - if error occured |
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public void readEnumerated ()
Decodes ASN.1 Enumerated type
Throws
| IOException | - if error occured |
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public void readOID ()
Decodes ASN.1 ObjectIdentifier type
Throws
| IOException | - if error occured |
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public void readOctetString ()
Decodes ASN.1 Octetstring type
Throws
| IOException | - if error occured |
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public final void setVerify ()
Sets verify mode.
Protected Methods
protected int read ()
Reads the next encoded byte from the encoded input stream.
Returns
- the next encoded byte
Throws
| IOException | - if error occured |
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