1 /*
   2  * Copyright (c) 2019, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.  Oracle designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Oracle in the LICENSE file that accompanied this code.
  10  *
  11  * This code is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 
  26 package sun.tools.common;
  27 
  28 import java.io.BufferedInputStream;
  29 import java.io.IOException;
  30 import java.io.InputStream;
  31 import java.io.InputStreamReader;
  32 import java.io.PrintStream;
  33 import java.util.Arrays;
  34 
  35 /**
  36  * A helper class which prints the content of input streams to print streams.
  37  */
  38 public class PrintStreamPrinter {
  39 
  40     /**
  41      * Reads characters in UTF-8 format from the input stream and prints them
  42      * with the given print stream. Closes the input stream before it returns.
  43      *
  44      * @return The number of printed characters.
  45      */
  46     public static long drainUTF8(InputStream is, PrintStream ps) throws IOException {
  47         long result = 0;
  48 
  49         try (BufferedInputStream bis = new BufferedInputStream(is);
  50              InputStreamReader isr = new InputStreamReader(bis, "UTF-8")) {
  51             char c[] = new char[8192];
  52             int n;
  53 
  54             do {
  55                 n = isr.read(c);
  56 
  57                 if (n > 0) {
  58                     result += n;
  59                     System.out.print(n == c.length ? c : Arrays.copyOf(c, n));
  60                 }
  61             } while (n > 0);
  62         }
  63 
  64         return result;
  65     }
  66 }