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 com.aliyun.odps.commons.util;
  
  import java.io.ByteArrayOutputStream;
  import java.io.FileInputStream;
  import java.io.IOException;
  import java.io.InputStream;
  import java.io.OutputStream;
  
  /**
   * IO Utils
   */
  public class IOUtils {
  
    public static final int READ_BUFFER_SIZE = 4096;
  
    private static final int EOF = -1;
  
    /**
     * Read fully from the InputStream
     *
     * @param in
     * @return
     * @throws IOException
     */
    public static byte[] readFully(InputStream in) throws IOException {
      try {
        byte[] buf = new byte[READ_BUFFER_SIZE];
        int read = -1;
        ByteArrayOutputStream os = new ByteArrayOutputStream();
        while ((read = in.read(buf)) != -1) {
          os.write(buf, 0, read);
        }
        os.close();
        return os.toByteArray();
      } finally {
        if (in != null) {
          in.close();
        }
      }
    }
  
    /**
     * Get InputStream bytes count without reading
     *
     * @param in
     * @return
     * @throws IOException
     */
    public static long getInputStreamLength(InputStream in) throws IOException {
      if (in instanceof FileInputStream) {
        return ((FileInputStream) in).getChannel().size();
      }
      return in.available();
    }
  
    /**
     * Reset the InputStream to the beginning/mark position without a large buffer
     *
     * @param in
     * @throws IOException
     */
    public static void resetInputStream(InputStream in) throws IOException {
      if (in.markSupported()) {
        in.reset();
      }
      if (in instanceof FileInputStream) {
        ((FileInputStream) in).getChannel().position(0);
      }
    }
  
    /**
     * Copy bytes from a large (over 2GB) <code>InputStream</code> to an
     * <code>OutputStream</code>.
     * <p>
     * This method buffers the input internally, so there is no need to use a
     * <code>BufferedInputStream</code>.
     * <p>
     * The buffer size is given by {@link #DEFAULT_BUFFER_SIZE}.
     *
     * @param input
     *     the <code>InputStream</code> to read from
     * @param output
     *     the <code>OutputStream</code> to write to
     * @return the number of bytes copied
     * @throws NullPointerException
     *     if the input or output is null
     * @throws IOException
     *     if an I/O error occurs
     * @since Shamelessly cloned from Apache Commons IO 1.3 IOUtils
     */
    public static long copyLarge(InputStream input, OutputStream output) throws IOException {
      return copyLarge(input, output, new byte[READ_BUFFER_SIZE]);
    }
  
    /**
     * Copy bytes from a large (over 2GB) <code>InputStream</code> to an
     * <code>OutputStream</code>.
     * <p>
     * This method uses the provided buffer, so there is no need to use a
     * <code>BufferedInputStream</code>.
     * <p>
     *
     * @param input
     *     the <code>InputStream</code> to read from
     * @param output
     *     the <code>OutputStream</code> to write to
     * @param buffer
     *     the buffer to use for the copy
     * @return the number of bytes copied
     * @throws NullPointerException
     *     if the input or output is null
     * @throws IOException
     *     if an I/O error occurs
     * @since Shamelessly cloned from Apache Commons IO 2.2 IOUtils
     */
    public static long copyLarge(InputStream input, OutputStream output, byte[] buffer)
        throws IOException {
      long count = 0;
      int n = 0;
      while (EOF != (n = input.read(buffer))) {
        output.write(buffer, 0, n);
        count += n;
      }
      return count;
    }
  
    public static String readStreamAsString(InputStream in, String charset) throws IOException {
      return new String(readFully(in), charset);
    }
  
    public static String readStreamAsString(InputStream in) throws IOException {
      return new String(readFully(in), "utf-8");
    }
  
    public static void closeSilently(InputStream in) {
      if (in != null) {
        try {
          in.close();
        } catch (IOException e) {
          // ignore
        }
      }
    }
  }
  