/*
    *  Licensed to the Apache Software Foundation (ASF) under one or more
    *  contributor license agreements.  See the NOTICE file distributed with
    *  this work for additional information regarding copyright ownership.
    *  The ASF licenses this file to You under the Apache License, Version 2.0
    *  (the "License"); you may not use this file except in compliance with
    *  the License.  You may obtain a copy of the License at
    *
    *      http://www.apache.org/licenses/LICENSE-2.0
   *
   *  Unless required by applicable law or agreed to in writing, software
   *  distributed under the License is distributed on an "AS IS" BASIS,
   *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   *  See the License for the specific language governing permissions and
   *  limitations under the License.
   */
  
  package org.apache.commons.compress.archivers.zip;
  
  import static org.junit.jupiter.api.Assertions.assertEquals;
  import static org.junit.jupiter.api.Assertions.assertNotEquals;
  
  import java.math.BigInteger;
  
  import org.junit.jupiter.api.Test;
  
  /**
   * JUnit tests for org.apache.commons.compress.archivers.zip.ZipEightByteInteger.
   */
  public class ZipEightByteIntegerTest {
  
      /**
       * Test conversion from bytes.
       */
      @Test
      public void testBIFromBytes() {
          final byte[] val = { (byte) 0xFE, (byte) 0xFF, (byte) 0xFF, (byte) 0xFF, (byte) 0xFF, (byte) 0xFF, (byte) 0xFF, (byte) 0xFF };
          final ZipEightByteInteger zl = new ZipEightByteInteger(val);
          assertEquals(BigInteger.valueOf(Long.MAX_VALUE).shiftLeft(1), zl.getValue(), "value from bytes");
      }
  
      /**
       * Test conversion to bytes.
       */
      @Test
      public void testBIToBytes() {
          final ZipEightByteInteger zl = new ZipEightByteInteger(BigInteger.valueOf(Long.MAX_VALUE).shiftLeft(1));
          final byte[] result = zl.getBytes();
          assertEquals(8, result.length, "length getBytes");
          assertEquals((byte) 0xFE, result[0], "first byte getBytes");
          assertEquals((byte) 0xFF, result[1], "second byte getBytes");
          assertEquals((byte) 0xFF, result[2], "third byte getBytes");
          assertEquals((byte) 0xFF, result[3], "fourth byte getBytes");
          assertEquals((byte) 0xFF, result[4], "fifth byte getBytes");
          assertEquals((byte) 0xFF, result[5], "sixth byte getBytes");
          assertEquals((byte) 0xFF, result[6], "seventh byte getBytes");
          assertEquals((byte) 0xFF, result[7], "eighth byte getBytes");
      }
  
      /**
       * Test the contract of the equals method.
       */
      @Test
      public void testEquals() {
          final ZipEightByteInteger zl = new ZipEightByteInteger(0x12345678);
          final ZipEightByteInteger zl2 = new ZipEightByteInteger(0x12345678);
          final ZipEightByteInteger zl3 = new ZipEightByteInteger(0x87654321);
  
          assertEquals(zl, zl, "reflexive");
  
          assertEquals(zl, zl2, "works");
          assertNotEquals(zl, zl3, "works, part two");
  
          assertEquals(zl2, zl, "symmetric");
  
          assertNotEquals(null, zl, "null handling");
          assertNotEquals(zl, Integer.valueOf(0x1234), "non ZipEightByteInteger handling");
      }
  
      /**
       * Test conversion from bytes.
       */
      @Test
      public void testLongFromBytes() {
          final byte[] val = { 0x78, 0x56, 0x34, 0x12, (byte) 0xAB, 0x00, 0x00, 0x00 };
          final ZipEightByteInteger zl = new ZipEightByteInteger(val);
          assertEquals(0xAB12345678L, zl.getLongValue(), "longValue from bytes");
      }
  
      /**
       * Test conversion to bytes.
       */
      @Test
      public void testLongToBytes() {
          final ZipEightByteInteger zl = new ZipEightByteInteger(0xAB12345678L);
          final byte[] result = zl.getBytes();
          assertEquals(8, result.length, "length getBytes");
          assertEquals(0x78, result[0], "first byte getBytes");
          assertEquals(0x56, result[1], "second byte getBytes");
         assertEquals(0x34, result[2], "third byte getBytes");
         assertEquals(0x12, result[3], "fourth byte getBytes");
         assertEquals((byte) 0xAB, result[4], "fifth byte getBytes");
         assertEquals(0, result[5], "sixth byte getBytes");
         assertEquals(0, result[6], "seventh byte getBytes");
         assertEquals(0, result[7], "eighth byte getBytes");
     }
 
     /**
      * Test sign handling.
      */
     @Test
     public void testSign() {
         final ZipEightByteInteger zl = new ZipEightByteInteger(
                 new byte[] { (byte) 0xFF, (byte) 0xFF, (byte) 0xFF, (byte) 0xFF, (byte) 0xFF, (byte) 0xFF, (byte) 0xFF, (byte) 0xFF });
         assertEquals(BigInteger.valueOf(Long.MAX_VALUE).shiftLeft(1).setBit(0), zl.getValue());
     }
 }