/*
    * Copyright (C) 2012, Robin Rosenberg
    * and other copyright owners as documented in the project's IP log.
    *
    * This program and the accompanying materials are made available
    * under the terms of the Eclipse Distribution License v1.0 which
    * accompanies this distribution, is reproduced below, and is
    * available at http://www.eclipse.org/org/documents/edl-v10.php
    *
   * All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or
   * without modification, are permitted provided that the following
   * conditions are met:
   *
   * - Redistributions of source code must retain the above copyright
   *   notice, this list of conditions and the following disclaimer.
   *
   * - Redistributions in binary form must reproduce the above
   *   copyright notice, this list of conditions and the following
   *   disclaimer in the documentation and/or other materials provided
   *   with the distribution.
   *
   * - Neither the name of the Eclipse Foundation, Inc. nor the
   *   names of its contributors may be used to endorse or promote
   *   products derived from this software without specific prior
   *   written permission.
   *
   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
   * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
   * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
   * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
   * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
   * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
   * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
   * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
   * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
   * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   */
  
  package org.eclipse.jgit.util.io;
  
  import static java.nio.charset.StandardCharsets.UTF_8;
  
  import java.io.ByteArrayInputStream;
  import java.io.ByteArrayOutputStream;
  import java.io.IOException;
  import java.io.InputStream;
  
  import org.junit.Assert;
  import org.junit.Test;
  
  public class AutoCRLFInputStreamTest {
  
  	@Test
  	public void test() throws IOException {
  		assertNoCrLf("", "");
  		assertNoCrLf("\r", "\r");
  		assertNoCrLf("\r\n", "\n");
  		assertNoCrLf("\r\n", "\r\n");
  		assertNoCrLf("\r\r", "\r\r");
  		assertNoCrLf("\r\n\r", "\n\r");
  		assertNoCrLf("\r\n\r\r", "\r\n\r\r");
  		assertNoCrLf("\r\n\r\n", "\r\n\r\n");
  		assertNoCrLf("\r\n\r\n\r", "\n\r\n\r");
  		assertNoCrLf("\0\n", "\0\n");
  	}
  
  	@Test
  	public void testBoundary() throws IOException {
  		for (int i = AutoCRLFInputStream.BUFFER_SIZE - 10; i < AutoCRLFInputStream.BUFFER_SIZE + 10; i++) {
  			String s1 = Strings.repeat("a", i);
  			assertNoCrLf(s1, s1);
  			String s2 = Strings.repeat("\0", i);
  			assertNoCrLf(s2, s2);
  		}
  	}
  
  	private void assertNoCrLf(String string, String string2) throws IOException {
  		assertNoCrLfHelper(string, string2);
  		// \u00e5 = LATIN SMALL LETTER A WITH RING ABOVE
  		// the byte value is negative
  		assertNoCrLfHelper("\u00e5" + string, "\u00e5" + string2);
  		assertNoCrLfHelper("\u00e5" + string + "\u00e5", "\u00e5" + string2
  				+ "\u00e5");
  		assertNoCrLfHelper(string + "\u00e5", string2 + "\u00e5");
  	}
  
  	private void assertNoCrLfHelper(String expect, String input)
  			throws IOException {
  		byte[] inbytes = input.getBytes(UTF_8);
  		byte[] expectBytes = expect.getBytes(UTF_8);
  		for (int i = 0; i < 5; ++i) {
  			byte[] buf = new byte[i];
  			try (ByteArrayInputStream bis = new ByteArrayInputStream(inbytes);
  					InputStream in = new AutoCRLFInputStream(bis, true);
 					ByteArrayOutputStream out = new ByteArrayOutputStream()) {
 				if (i > 0) {
 					int n;
 					while ((n = in.read(buf)) >= 0) {
 						out.write(buf, 0, n);
 					}
 				} else {
 					int c;
 					while ((c = in.read()) != -1)
 						out.write(c);
 				}
 				out.flush();
 				byte[] actualBytes = out.toByteArray();
 				Assert.assertEquals("bufsize=" + i, encode(expectBytes),
 						encode(actualBytes));
 			}
 		}
 	}
 
 	String encode(byte[] in) {
 		StringBuilder str = new StringBuilder();
 		for (byte b : in) {
 			if (b < 32)
 				str.append(0xFF & b);
 			else {
 				str.append("'");
 				str.append((char) b);
 				str.append("'");
 			}
 			str.append(' ');
 		}
 		return str.toString();
 	}
 
 }