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DSS Model contains the data model representation for DSS

There is a newer version: 6.0.d4j.2

package port.org.bouncycastle.asn1;

import java.io.IOException;
import java.io.InputStream;

class ConstructedOctetStream extends InputStream {

	private final ASN1StreamParser _parser;

	private boolean _first = true;
	private InputStream _currentStream;

	ConstructedOctetStream(ASN1StreamParser parser) {
		_parser = parser;
	}

	@Override
	public int read(byte[] b, int off, int len) throws IOException {
		if (_currentStream == null) {
			if (!_first) {
				return -1;
			}

			ASN1OctetStringParser s = (ASN1OctetStringParser) _parser.readObject();

			if (s == null) {
				return -1;
			}

			_first = false;
			_currentStream = s.getOctetStream();
		}

		int totalRead = 0;

		for (;;) {
			int numRead = _currentStream.read(b, off + totalRead, len - totalRead);

			if (numRead >= 0) {
				totalRead += numRead;

				if (totalRead == len) {
					return totalRead;
				}
			} else {
				ASN1OctetStringParser aos = (ASN1OctetStringParser) _parser.readObject();

				if (aos == null) {
					_currentStream = null;
					return totalRead < 1 ? -1 : totalRead;
				}

				_currentStream = aos.getOctetStream();
			}
		}
	}

	@Override
	public int read() throws IOException {
		if (_currentStream == null) {
			if (!_first) {
				return -1;
			}

			ASN1OctetStringParser s = (ASN1OctetStringParser) _parser.readObject();

			if (s == null) {
				return -1;
			}

			_first = false;
			_currentStream = s.getOctetStream();
		}

		for (;;) {
			int b = _currentStream.read();

			if (b >= 0) {
				return b;
			}

			ASN1OctetStringParser s = (ASN1OctetStringParser) _parser.readObject();

			if (s == null) {
				_currentStream = null;
				return -1;
			}

			_currentStream = s.getOctetStream();
		}
	}

}