org.bouncycastle.asn1.BERGenerator Maven / Gradle / Ivy
package org.bouncycastle.asn1;
import java.io.IOException;
import java.io.OutputStream;
/**
* Base class for generators for indefinite-length structures.
*/
public class BERGenerator
extends ASN1Generator
{
private boolean _tagged = false;
private boolean _isExplicit;
private int _tagNo;
protected BERGenerator(OutputStream out)
{
super(out);
}
protected BERGenerator(OutputStream out, int tagNo, boolean isExplicit)
{
super(out);
// TODO Check proper handling of implicit tagging
_tagged = true;
_isExplicit = isExplicit;
_tagNo = tagNo;
}
public OutputStream getRawOutputStream()
{
return _out;
}
private void writeHdr(int tag) throws IOException
{
_out.write(tag);
_out.write(0x80);
}
protected void writeBERHeader(int tag) throws IOException
{
if (_tagged)
{
int tagNum = _tagNo | BERTags.TAGGED;
if (_isExplicit)
{
writeHdr(tagNum | BERTags.CONSTRUCTED);
writeHdr(tag);
}
else
{
if ((tag & BERTags.CONSTRUCTED) != 0)
{
writeHdr(tagNum | BERTags.CONSTRUCTED);
}
else
{
writeHdr(tagNum);
}
}
}
else
{
writeHdr(tag);
}
}
protected void writeBEREnd() throws IOException
{
_out.write(0x00);
_out.write(0x00);
if (_tagged && _isExplicit) // write extra end for tag header
{
_out.write(0x00);
_out.write(0x00);
}
}
}