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package org.spongycastle.asn1;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import org.spongycastle.util.io.Streams;
public abstract class DERGenerator
extends ASN1Generator
{
private boolean _tagged = false;
private boolean _isExplicit;
private int _tagNo;
protected DERGenerator(
OutputStream out)
{
super(out);
}
public DERGenerator(
OutputStream out,
int tagNo,
boolean isExplicit)
{
super(out);
_tagged = true;
_isExplicit = isExplicit;
_tagNo = tagNo;
}
private void writeLength(
OutputStream out,
int length)
throws IOException
{
if (length > 127)
{
int size = 1;
int val = length;
while ((val >>>= 8) != 0)
{
size++;
}
out.write((byte)(size | 0x80));
for (int i = (size - 1) * 8; i >= 0; i -= 8)
{
out.write((byte)(length >> i));
}
}
else
{
out.write((byte)length);
}
}
void writeDEREncoded(
OutputStream out,
int tag,
byte[] bytes)
throws IOException
{
out.write(tag);
writeLength(out, bytes.length);
out.write(bytes);
}
void writeDEREncoded(
int tag,
byte[] bytes)
throws IOException
{
if (_tagged)
{
int tagNum = _tagNo | BERTags.TAGGED;
if (_isExplicit)
{
int newTag = _tagNo | BERTags.CONSTRUCTED | BERTags.TAGGED;
ByteArrayOutputStream bOut = new ByteArrayOutputStream();
writeDEREncoded(bOut, tag, bytes);
writeDEREncoded(_out, newTag, bOut.toByteArray());
}
else
{
if ((tag & BERTags.CONSTRUCTED) != 0)
{
writeDEREncoded(_out, tagNum | BERTags.CONSTRUCTED, bytes);
}
else
{
writeDEREncoded(_out, tagNum, bytes);
}
}
}
else
{
writeDEREncoded(_out, tag, bytes);
}
}
void writeDEREncoded(
OutputStream out,
int tag,
InputStream in)
throws IOException
{
writeDEREncoded(out, tag, Streams.readAll(in));
}
}
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