| /* |
| * 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.tools.ant.util; |
| |
| import java.io.InputStream; |
| import java.io.IOException; |
| import java.io.OutputStream; |
| import java.io.PrintStream; |
| |
| /** |
| * UUEncoding of an input stream placed into an outputstream. |
| * This class is meant to be a drop in replacement for |
| * sun.misc.UUEncoder, which was previously used by Ant. |
| * The uuencode algorithm code has been copied from the |
| * geronimo project. |
| **/ |
| |
| public class UUEncoder { |
| protected static final int DEFAULT_MODE = 644; |
| private static final int MAX_CHARS_PER_LINE = 45; |
| private static final int INPUT_BUFFER_SIZE = MAX_CHARS_PER_LINE * 100; |
| private OutputStream out; |
| private String name; |
| |
| /** |
| * Constructor specifing a name for the encoded buffer, begin |
| * line will be: |
| * <pre> |
| * begin 644 [NAME] |
| * </pre> |
| * @param name the name of the encoded buffer. |
| */ |
| public UUEncoder(String name) { |
| this.name = name; |
| } |
| |
| /** |
| * UUEncode bytes from the input stream, and write them as text characters |
| * to the output stream. This method will run until it exhausts the |
| * input stream. |
| * @param is the input stream. |
| * @param out the output stream. |
| * @throws IOException if there is an error. |
| */ |
| public void encode(InputStream is, OutputStream out) |
| throws IOException { |
| this.out = out; |
| encodeBegin(); |
| byte[] buffer = new byte[INPUT_BUFFER_SIZE]; |
| int count; |
| while ((count = is.read(buffer, 0, buffer.length)) != -1) { |
| int pos = 0; |
| while (count > 0) { |
| int num = count > MAX_CHARS_PER_LINE |
| ? MAX_CHARS_PER_LINE |
| : count; |
| encodeLine(buffer, pos, num, out); |
| pos += num; |
| count -= num; |
| } |
| } |
| out.flush(); |
| encodeEnd(); |
| } |
| |
| /** |
| * Encode a string to the output. |
| */ |
| private void encodeString(String n) throws IOException { |
| PrintStream writer = new PrintStream(out); |
| writer.print(n); |
| writer.flush(); |
| } |
| |
| private void encodeBegin() throws IOException { |
| encodeString("begin " + DEFAULT_MODE + " " + name + "\n"); |
| } |
| |
| private void encodeEnd() throws IOException { |
| encodeString(" \nend\n"); |
| } |
| |
| /** |
| * Encode a single line of data (less than or equal to 45 characters). |
| * |
| * @param data The array of byte data. |
| * @param off The starting offset within the data. |
| * @param length Length of the data to encode. |
| * @param out The output stream the encoded data is written to. |
| * |
| * @exception IOException |
| */ |
| private void encodeLine( |
| byte[] data, int offset, int length, OutputStream out) |
| throws IOException { |
| // write out the number of characters encoded in this line. |
| // CheckStyle:MagicNumber OFF |
| out.write((byte) ((length & 0x3F) + ' ')); |
| // CheckStyle:MagicNumber ON |
| byte a; |
| byte b; |
| byte c; |
| |
| for (int i = 0; i < length;) { |
| // set the padding defaults |
| b = 1; |
| c = 1; |
| // get the next 3 bytes (if we have them) |
| a = data[offset + i++]; |
| if (i < length) { |
| b = data[offset + i++]; |
| if (i < length) { |
| c = data[offset + i++]; |
| } |
| } |
| |
| // CheckStyle:MagicNumber OFF |
| byte d1 = (byte) (((a >>> 2) & 0x3F) + ' '); |
| byte d2 = (byte) ((((a << 4) & 0x30) | ((b >>> 4) & 0x0F)) + ' '); |
| byte d3 = (byte) ((((b << 2) & 0x3C) | ((c >>> 6) & 0x3)) + ' '); |
| byte d4 = (byte) ((c & 0x3F) + ' '); |
| // CheckStyle:MagicNumber ON |
| |
| out.write(d1); |
| out.write(d2); |
| out.write(d3); |
| out.write(d4); |
| } |
| |
| // terminate with a linefeed alone |
| out.write('\n'); |
| } |
| } |