65 lines
1.9 KiB
Java
65 lines
1.9 KiB
Java
// SPDX-FileCopyrightText: 2021 David Hook <dgh@cryptoworkshop.com>
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// SPDX-FileCopyrightText: 2022 Paul Schaub <vanitasvitae@fsfe.org>
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//
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// SPDX-License-Identifier: Apache-2.0
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package org.pgpainless.encryption_signing;
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import org.pgpainless.algorithm.StreamEncoding;
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import java.io.IOException;
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import java.io.OutputStream;
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/**
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* {@link OutputStream} which applies CR-LF encoding of its input data, based on the desired {@link StreamEncoding}.
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*
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*
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* If you need PGPainless to CRLF encode signed data for you, you could do the following:
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* {@code
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* <pre>
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* InputStream plaintext = ...
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* EncryptionStream signerOrEncryptor = PGPainless.signAndOrEncrypt(...);
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* CRLFGeneratorStream crlfOut = new CRLFGeneratorStream(signerOrEncryptor, streamEncoding);
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*
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* Streams.pipeAll(plaintext, crlfOut);
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* crlfOut.close;
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*
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* EncryptionResult result = signerOrEncryptor.getResult();
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* </pre>
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* }
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* This implementation originates from the Bouncy Castle library.
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*/
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public class CRLFGeneratorStream extends OutputStream {
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protected final OutputStream crlfOut;
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private final boolean isBinary;
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private int lastB = 0;
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public CRLFGeneratorStream(OutputStream crlfOut, StreamEncoding encoding) {
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this.crlfOut = crlfOut;
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this.isBinary = encoding == StreamEncoding.BINARY;
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}
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public void write(int b) throws IOException {
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if (!isBinary) {
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if (b == '\n' && lastB != '\r') { // Unix
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crlfOut.write('\r');
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} else if (lastB == '\r') { // MAC
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if (b != '\n') {
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crlfOut.write('\n');
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}
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}
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lastB = b;
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}
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crlfOut.write(b);
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}
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public void close() throws IOException {
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if (!isBinary && lastB == '\r') { // MAC
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crlfOut.write('\n');
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}
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crlfOut.close();
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}
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}
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