content: /*
   * Copyright 2016 Google Inc.
   *
   * Licensed 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 com.google.android.things.contrib.driver.apa102;
  
  import org.hamcrest.BaseMatcher;
  import org.hamcrest.Description;
  
  import java.util.Arrays;
  
  public class BytesMatcher extends BaseMatcher<byte[]> {
      private byte[] mExpectedBytes;
  
      BytesMatcher(byte[] expectedBytes) {
          mExpectedBytes = expectedBytes;
      }
  
      public static BytesMatcher contains(byte... expectedBytes) {
          return new BytesMatcher(expectedBytes);
      }
  
      @Override
      public void describeTo(Description description) {
          description.appendText(Arrays.toString(mExpectedBytes));
      }
  
      @Override
      public boolean matches(Object item) {
          byte[] spiData = (byte[]) item;
          for (int i = 0; i < spiData.length - mExpectedBytes.length + 1; i++) {
              int j;
              for (j = 0; j < mExpectedBytes.length; j++) {
                  if (spiData[i+j] != mExpectedBytes[j]) {
                      break;
                  }
              }
              if (j == mExpectedBytes.length) {
                  return true;
              }
          }
          return false;
      }
  }
  