/**
    * 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.wss4j.stax.utils;
  
  import org.apache.xml.security.utils.I18n;
  
  import java.io.FilterInputStream;
  import java.io.IOException;
  import java.io.InputStream;
  
  /**
   */
  public final class LimitingInputStream extends FilterInputStream {
  
      private long limit;
      private long count;
  
      public LimitingInputStream(InputStream in, long limit) {
          super(in);
          this.limit = limit;
      }
  
      @Override
      public int read() throws IOException {
          int r = super.read();
          if (r >= 0) {
              incrementCountAndTestLimit(r);
          }
          return r;
      }
  
      @Override
      public int read(byte[] b) throws IOException {
          return read(b, 0, b.length);
      }
  
      @Override
      public int read(byte[] b, int off, int len) throws IOException {
          int r = super.read(b, off, len);
          if (r >= 0) {
              incrementCountAndTestLimit(r);
          }
          return r;
      }
  
      private void incrementCountAndTestLimit(long read) throws IOException {
          this.count += read;
          if (this.count > this.limit) {
              throw new IOException(I18n.getExceptionMessage("secureProcessing.inputStreamLimitReached", new Object[]{this.limit}));
          }
      }
  }