Package org.verapdf.as.filters.io

Class COSFilterASCIIReader

java.lang.Object

org.verapdf.as.filters.io.COSFilterASCIIReader

public class COSFilterASCIIReader
extends Object

This is class-helper for decoding ASCII85 and ASCII Hex strings. It reads next required amount of bytes and guarantees that white-space characters will be skipped. It also looks for end of data.

Author:

Sergey Shemyakov

Constructor Summary

Constructors

Constructor	Description
COSFilterASCIIReader(ASInputStream stream, boolean isASCIIHex)	Constructor from encoded stream.

Method Summary

Modifier and Type	Method	Description
byte[]	getNextBytes()	Method gets next portion of bytes: two for ASCII Hex encoding and five for ASCII85 encoding.

Methods inherited from class java.lang.Object

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

Constructor Details

COSFilterASCIIReader

public COSFilterASCIIReader(ASInputStream stream,
 boolean isASCIIHex)

Constructor from encoded stream.

Parameters:

stream - is ASCII Hex or ASCII85 encoded stream.

isASCIIHex - is true if stream ASCII Hex encoded, false if stream is ASCII85 encoded.

Method Details

getNextBytes

public byte[] getNextBytes()
                    throws IOException

Method gets next portion of bytes: two for ASCII Hex encoding and five for ASCII85 encoding. It ignores all the white-space characters.

Returns:

null if end of stream is reached and next portion of bytes otherwise. If ASCII85 is chosen, method can return less than 5 bytes in case if they are last group of bytes in data string.

Throws:

IOException