content: /**
   * 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.activemq.util;
  
  import java.io.IOException;
  import java.io.InputStream;
  
  /**
   * Very similar to the java.io.ByteArrayInputStream but this version is not
   * thread safe.
   */
  public class ByteArrayInputStream extends InputStream {
  
      byte buffer[];
      int limit;
      int pos;
      int mark;
  
      public ByteArrayInputStream(byte data[]) {
          this(data, 0, data.length);
      }
  
      public ByteArrayInputStream(ByteSequence sequence) {
          this(sequence.getData(), sequence.getOffset(), sequence.getLength());
      }
  
      public ByteArrayInputStream(byte data[], int offset, int size) {
          this.buffer = data;
          this.mark = offset;
          this.pos = offset;
          this.limit = offset + size;
      }
  
      public int read() throws IOException {
          if (pos < limit) {
              return buffer[pos++] & 0xff;
          } else {
              return -1;
          }
      }
  
      public int read(byte[] b) throws IOException {
          return read(b, 0, b.length);
      }
  
      public int read(byte b[], int off, int len) {
          if (pos < limit) {
              len = Math.min(len, limit - pos);
              if (len > 0) {
                  System.arraycopy(buffer, pos, b, off, len);
                  pos += len;
              }
              return len;
          } else {
              return -1;
          }
      }
  
      public long skip(long len) throws IOException {
          if (pos < limit) {
              len = Math.min(len, limit - pos);
              if (len > 0) {
                  pos += len;
              }
              return len;
          } else {
              return -1;
          }
      }
  
      public int available() {
          return limit - pos;
      }
  
      public boolean markSupported() {
          return true;
      }
  
      public void mark(int markpos) {
          mark = pos;
      }
  
      public void reset() {
          pos = mark;
      }
  }
  