/*
    * 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
    *
   *   https://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.utils;
  
  import static org.apache.commons.compress.utils.ByteUtils.fromLittleEndian;
  import static org.apache.commons.compress.utils.ByteUtils.toLittleEndian;
  import static org.junit.jupiter.api.Assertions.assertArrayEquals;
  import static org.junit.jupiter.api.Assertions.assertEquals;
  import static org.junit.jupiter.api.Assertions.assertThrows;
  
  import java.io.ByteArrayInputStream;
  import java.io.ByteArrayOutputStream;
  import java.io.DataInput;
  import java.io.DataInputStream;
  import java.io.DataOutput;
  import java.io.DataOutputStream;
  import java.io.EOFException;
  import java.io.IOException;
  import java.util.Arrays;
  
  import org.apache.commons.compress.utils.ByteUtils.InputStreamByteSupplier;
  import org.apache.commons.compress.utils.ByteUtils.OutputStreamByteConsumer;
  import org.junit.jupiter.api.Test;
  
  class ByteUtilsTest {
  
      @Test
      void testFromLittleEndianFromArray() {
          final byte[] b = { 1, 2, 3, 4, 5 };
          assertEquals(2 + 3 * 256 + 4 * 256 * 256, fromLittleEndian(b, 1, 3));
      }
  
      @Test
      void testFromLittleEndianFromArrayOneArg() {
          final byte[] b = { 2, 3, 4 };
          assertEquals(2 + 3 * 256 + 4 * 256 * 256, fromLittleEndian(b));
      }
  
      @Test
      void testFromLittleEndianFromArrayOneArgThrowsForLengthTooBig() {
          assertThrows(IllegalArgumentException.class, () -> fromLittleEndian(new byte[] { 1, 2, 3, 4, 5, 6, 7, 8, 9 }));
      }
  
      @Test
      void testFromLittleEndianFromArrayOneArgUnsignedInt32() {
          final byte[] b = { 2, 3, 4, (byte) 128 };
          assertEquals(2 + 3 * 256 + 4 * 256 * 256 + 128L * 256 * 256 * 256, fromLittleEndian(b));
      }
  
      @Test
      void testFromLittleEndianFromArrayThrowsForLengthTooBig() {
          assertThrows(IllegalArgumentException.class, () -> fromLittleEndian(ByteUtils.EMPTY_BYTE_ARRAY, 0, 9));
      }
  
      @Test
      void testFromLittleEndianFromArrayUnsignedInt32() {
          final byte[] b = { 1, 2, 3, 4, (byte) 128 };
          assertEquals(2 + 3 * 256 + 4 * 256 * 256 + 128L * 256 * 256 * 256, fromLittleEndian(b, 1, 4));
      }
  
      @Test
      void testFromLittleEndianFromDataInput() throws IOException {
          final DataInput din = new DataInputStream(new ByteArrayInputStream(new byte[] { 2, 3, 4, 5 }));
          assertEquals(2 + 3 * 256 + 4 * 256 * 256, fromLittleEndian(din, 3));
      }
  
      @Test
      void testFromLittleEndianFromDataInputThrowsForLengthTooBig() {
          final DataInput din = new DataInputStream(new ByteArrayInputStream(ByteUtils.EMPTY_BYTE_ARRAY));
          assertThrows(IllegalArgumentException.class, () -> fromLittleEndian(din, 9));
      }
  
      @Test
      void testFromLittleEndianFromDataInputThrowsForPrematureEnd() {
          final DataInput din = new DataInputStream(new ByteArrayInputStream(new byte[] { 2, 3 }));
          assertThrows(EOFException.class, () -> fromLittleEndian(din, 3));
      }
  
      @Test
      void testFromLittleEndianFromDataInputUnsignedInt32() throws IOException {
          final DataInput din = new DataInputStream(new ByteArrayInputStream(new byte[] { 2, 3, 4, (byte) 128 }));
          assertEquals(2 + 3 * 256 + 4 * 256 * 256 + 128L * 256 * 256 * 256, fromLittleEndian(din, 4));
     }
 
     @Test
     void testFromLittleEndianFromStream() throws IOException {
         final ByteArrayInputStream bin = new ByteArrayInputStream(new byte[] { 2, 3, 4, 5 });
         assertEquals(2 + 3 * 256 + 4 * 256 * 256, fromLittleEndian(bin, 3));
     }
 
     @Test
     void testFromLittleEndianFromStreamThrowsForLengthTooBig() {
         assertThrows(IllegalArgumentException.class, () -> fromLittleEndian(new ByteArrayInputStream(ByteUtils.EMPTY_BYTE_ARRAY), 9));
     }
 
     @Test
     void testFromLittleEndianFromStreamThrowsForPrematureEnd() {
         final ByteArrayInputStream bin = new ByteArrayInputStream(new byte[] { 2, 3 });
         assertThrows(IOException.class, () -> fromLittleEndian(bin, 3));
     }
 
     @Test
     void testFromLittleEndianFromStreamUnsignedInt32() throws IOException {
         final ByteArrayInputStream bin = new ByteArrayInputStream(new byte[] { 2, 3, 4, (byte) 128 });
         assertEquals(2 + 3 * 256 + 4 * 256 * 256 + 128L * 256 * 256 * 256, fromLittleEndian(bin, 4));
     }
 
     @Test
     void testFromLittleEndianFromSupplier() throws IOException {
         final ByteArrayInputStream bin = new ByteArrayInputStream(new byte[] { 2, 3, 4, 5 });
         assertEquals(2 + 3 * 256 + 4 * 256 * 256, fromLittleEndian(new InputStreamByteSupplier(bin), 3));
     }
 
     @Test
     void testFromLittleEndianFromSupplierThrowsForLengthTooBig() {
         assertThrows(IllegalArgumentException.class,
                 () -> fromLittleEndian(new InputStreamByteSupplier(new ByteArrayInputStream(ByteUtils.EMPTY_BYTE_ARRAY)), 9));
     }
 
     @Test
     void testFromLittleEndianFromSupplierThrowsForPrematureEnd() {
         final ByteArrayInputStream bin = new ByteArrayInputStream(new byte[] { 2, 3 });
         assertThrows(IOException.class, () -> fromLittleEndian(new InputStreamByteSupplier(bin), 3));
     }
 
     @Test
     void testFromLittleEndianFromSupplierUnsignedInt32() throws IOException {
         final ByteArrayInputStream bin = new ByteArrayInputStream(new byte[] { 2, 3, 4, (byte) 128 });
         assertEquals(2 + 3 * 256 + 4 * 256 * 256 + 128L * 256 * 256 * 256, fromLittleEndian(new InputStreamByteSupplier(bin), 4));
     }
 
     @Test
     void testToLittleEndianToByteArray() {
         final byte[] b = new byte[4];
         toLittleEndian(b, 2 + 3 * 256 + 4 * 256 * 256, 1, 3);
         assertArrayEquals(new byte[] { 2, 3, 4 }, Arrays.copyOfRange(b, 1, 4));
     }
 
     @Test
     void testToLittleEndianToByteArrayUnsignedInt32() {
         final byte[] b = new byte[4];
         toLittleEndian(b, 2 + 3 * 256 + 4 * 256 * 256 + 128L * 256 * 256 * 256, 0, 4);
         assertArrayEquals(new byte[] { 2, 3, 4, (byte) 128 }, b);
     }
 
     @Test
     void testToLittleEndianToConsumer() throws IOException {
         final byte[] byteArray;
         final byte[] expected = { 2, 3, 4 };
         try (ByteArrayOutputStream bos = new ByteArrayOutputStream()) {
             toLittleEndian(new OutputStreamByteConsumer(bos), 2 + 3 * 256 + 4 * 256 * 256, 3);
             byteArray = bos.toByteArray();
             assertArrayEquals(expected, byteArray);
         }
         assertArrayEquals(expected, byteArray);
     }
 
     @Test
     void testToLittleEndianToConsumerUnsignedInt32() throws IOException {
         final byte[] byteArray;
         final byte[] expected = { 2, 3, 4, (byte) 128 };
         try (ByteArrayOutputStream bos = new ByteArrayOutputStream()) {
             toLittleEndian(new OutputStreamByteConsumer(bos), 2 + 3 * 256 + 4 * 256 * 256 + 128L * 256 * 256 * 256, 4);
             byteArray = bos.toByteArray();
             assertArrayEquals(expected, byteArray);
         }
         assertArrayEquals(expected, byteArray);
     }
 
     @Test
     void testToLittleEndianToDataOutput() throws IOException {
         final byte[] byteArray;
         final byte[] expected = { 2, 3, 4 };
         try (ByteArrayOutputStream bos = new ByteArrayOutputStream()) {
             final DataOutput dos = new DataOutputStream(bos);
             toLittleEndian(dos, 2 + 3 * 256 + 4 * 256 * 256, 3);
             byteArray = bos.toByteArray();
             assertArrayEquals(expected, byteArray);
         }
         assertArrayEquals(expected, byteArray);
     }
 
     @Test
     void testToLittleEndianToDataOutputUnsignedInt32() throws IOException {
         final byte[] byteArray;
         final byte[] expected = { 2, 3, 4, (byte) 128 };
         try (ByteArrayOutputStream bos = new ByteArrayOutputStream()) {
             final DataOutput dos = new DataOutputStream(bos);
             toLittleEndian(dos, 2 + 3 * 256 + 4 * 256 * 256 + 128L * 256 * 256 * 256, 4);
             byteArray = bos.toByteArray();
             assertArrayEquals(expected, byteArray);
         }
         assertArrayEquals(expected, byteArray);
     }
 
     @Test
     void testToLittleEndianToStream() throws IOException {
         final byte[] byteArray;
         final byte[] expected = { 2, 3, 4 };
         try (ByteArrayOutputStream bos = new ByteArrayOutputStream()) {
             toLittleEndian(bos, 2 + 3 * 256 + 4 * 256 * 256, 3);
             byteArray = bos.toByteArray();
             assertArrayEquals(expected, byteArray);
         }
         assertArrayEquals(expected, byteArray);
     }
 
     @Test
     void testToLittleEndianToStreamUnsignedInt32() throws IOException {
         final byte[] byteArray;
         final byte[] expected = { 2, 3, 4, (byte) 128 };
         try (ByteArrayOutputStream bos = new ByteArrayOutputStream()) {
             toLittleEndian(bos, 2 + 3 * 256 + 4 * 256 * 256 + 128L * 256 * 256 * 256, 4);
             byteArray = bos.toByteArray();
             assertArrayEquals(expected, byteArray);
         }
         assertArrayEquals(expected, byteArray);
     }
 }