package org.apache.commons.ssl.asn1;
import java.io.IOException;
import java.io.OutputStream;
public class BEROctetStringGenerator
extends BERGenerator {
public BEROctetStringGenerator(OutputStream out)
throws IOException {
super(out);
writeBERHeader(DERTags.CONSTRUCTED | DERTags.OCTET_STRING);
}
public BEROctetStringGenerator(
OutputStream out,
int tagNo,
boolean isExplicit)
throws IOException {
super(out, tagNo, isExplicit);
writeBERHeader(DERTags.CONSTRUCTED | DERTags.OCTET_STRING);
}
public OutputStream getOctetOutputStream() {
return getOctetOutputStream(new byte[1000]); // limit for CER encoding.
}
public OutputStream getOctetOutputStream(
byte[] buf) {
return new BufferedBEROctetStream(buf);
}
private class BufferedBEROctetStream
extends OutputStream {
private byte[] _buf;
private int _off;
BufferedBEROctetStream(
byte[] buf) {
_buf = buf;
_off = 0;
}
public void write(
int b)
throws IOException {
_buf[_off++] = (byte) b;
if (_off == _buf.length) {
_out.write(new DEROctetString(_buf).getEncoded());
_off = 0;
}
}
public void write(byte[] b, int off, int len) throws IOException {
while (len > 0) {
int numToCopy = Math.min(len, _buf.length - _off);
System.arraycopy(b, off, _buf, _off, numToCopy);
_off += numToCopy;
if (_off < _buf.length) {
break;
}
_out.write(new DEROctetString(_buf).getEncoded());
_off = 0;
off += numToCopy;
len -= numToCopy;
}
}
public void close()
throws IOException {
if (_off != 0) {
byte[] bytes = new byte[_off];
System.arraycopy(_buf, 0, bytes, 0, _off);
_out.write(new DEROctetString(bytes).getEncoded());
}
writeBEREnd();
}
}
}