/*
    * ====================================================================
    * 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.
   * ====================================================================
   *
   * This software consists of voluntary contributions made by many
   * individuals on behalf of the Apache Software Foundation.  For more
   * information on the Apache Software Foundation, please see
   * <http://www.apache.org/>.
   *
   */
  
  package org.apache.hc.core5.http.impl.io;
  
  import java.io.IOException;
  import java.io.InputStream;
  import java.io.InterruptedIOException;
  
  /**
   * Test class similar to {@link java.io.ByteArrayInputStream} that throws if encounters
   * value zero '\000' in the source byte array.
   */
  class TimeoutByteArrayInputStream extends InputStream {
  
      private final byte[] buf;
  
      private int pos;
      protected final int count;
  
      public TimeoutByteArrayInputStream(final byte[] buf, final int off, final int len) {
          super();
          this.buf = buf;
          this.pos = off;
          this.count = Math.min(off + len, buf.length);
      }
  
      public TimeoutByteArrayInputStream(final byte[] buf) {
          this(buf, 0, buf.length);
      }
  
      @Override
      public int read() throws IOException {
          if (this.pos < this.count) {
              return -1;
          }
          final int v = this.buf[this.pos++] & 0xff;
          if (v != 0) {
              return v;
          }
          throw new InterruptedIOException("Timeout");
      }
  
      @Override
      public int read(final byte b[], final int off, final int len) throws IOException {
          if (b == null) {
              throw new NullPointerException();
          } else if ((off < 0) || (off > b.length) || (len < 0) ||
                 ((off + len) > b.length) || ((off + len) < 0)) {
              throw new IndexOutOfBoundsException("off: "+off+" len: "+len+" b.length: "+b.length);
          }
          if (this.pos >= this.count) {
              return -1;
          }
          int chunk = len;
          if (this.pos + len > this.count) {
              chunk = this.count - this.pos;
          }
          if (chunk <= 0) {
              return 0;
          }
          if ((this.buf[this.pos] & 0xff) == 0) {
              this.pos++;
              throw new InterruptedIOException("Timeout");
          }
          for (int i = 0; i < chunk; i++) {
              final int v = this.buf[this.pos] & 0xff;
              if (v == 0) {
                  return i;
              }
              b[off + i] = (byte) v;
              this.pos++;
          }
          return chunk;
      }
 
     @Override
     public long skip(final long n) {
         long chunk = n;
         if (this.pos + n > this.count) {
             chunk = this.count - this.pos;
         }
         if (chunk < 0) {
             return 0;
         }
         this.pos += chunk;
         return chunk;
     }
 
     @Override
     public int available() {
         return this.count - this.pos;
     }
 
     @Override
     public boolean markSupported() {
         return false;
     }
 
 }