1 /* |
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2 * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved. |
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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4 * |
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5 * This code is free software; you can redistribute it and/or modify it |
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6 * under the terms of the GNU General Public License version 2 only, as |
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7 * published by the Free Software Foundation. Oracle designates this |
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8 * particular file as subject to the "Classpath" exception as provided |
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9 * by Oracle in the LICENSE file that accompanied this code. |
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10 * |
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11 * This code is distributed in the hope that it will be useful, but WITHOUT |
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12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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14 * version 2 for more details (a copy is included in the LICENSE file that |
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15 * accompanied this code). |
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16 * |
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17 * You should have received a copy of the GNU General Public License version |
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18 * 2 along with this work; if not, write to the Free Software Foundation, |
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19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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20 * |
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21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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22 * or visit www.oracle.com if you need additional information or have any |
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23 * questions. |
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24 */ |
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25 |
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26 /* |
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27 * @(#)UUEncoderStream.java 1.3 02/03/27 |
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28 */ |
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29 |
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30 |
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31 |
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32 package com.sun.xml.internal.messaging.saaj.packaging.mime.util; |
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33 |
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34 import java.io.*; |
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35 |
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36 /** |
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37 * This class implements a UUEncoder. It is implemented as |
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38 * a FilterOutputStream, so one can just wrap this class around |
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39 * any output stream and write bytes into this filter. The Encoding |
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40 * is done as the bytes are written out. |
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41 * |
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42 * @author John Mani |
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43 */ |
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44 |
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45 public class UUEncoderStream extends FilterOutputStream { |
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46 private byte[] buffer; // cache of bytes that are yet to be encoded |
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47 private int bufsize = 0; // size of the cache |
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48 private boolean wrotePrefix = false; |
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49 |
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50 protected String name; // name of file |
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51 protected int mode; // permissions mode |
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52 |
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53 /** |
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54 * Create a UUencoder that encodes the specified input stream |
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55 * @param out the output stream |
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56 */ |
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57 public UUEncoderStream(OutputStream out) { |
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58 this(out, "encoder.buf", 644); |
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59 } |
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60 |
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61 /** |
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62 * Create a UUencoder that encodes the specified input stream |
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63 * @param out the output stream |
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64 * @param name Specifies a name for the encoded buffer |
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65 */ |
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66 public UUEncoderStream(OutputStream out, String name) { |
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67 this(out, name, 644); |
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68 } |
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69 |
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70 /** |
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71 * Create a UUencoder that encodes the specified input stream |
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72 * @param out the output stream |
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73 * @param name Specifies a name for the encoded buffer |
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74 * @param mode Specifies permission mode for the encoded buffer |
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75 */ |
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76 public UUEncoderStream(OutputStream out, String name, int mode) { |
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77 super(out); |
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78 this.name = name; |
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79 this.mode = mode; |
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80 buffer = new byte[45]; |
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81 } |
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82 |
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83 /** |
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84 * Set up the buffer name and permission mode. |
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85 * This method has any effect only if it is invoked before |
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86 * you start writing into the output stream |
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87 */ |
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88 public void setNameMode(String name, int mode) { |
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89 this.name = name; |
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90 this.mode = mode; |
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91 } |
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92 |
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93 public void write(byte[] b, int off, int len) throws IOException { |
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94 for (int i = 0; i < len; i++) |
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95 write(b[off + i]); |
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96 } |
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97 |
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98 public void write(byte[] data) throws IOException { |
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99 write(data, 0, data.length); |
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100 } |
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101 |
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102 public void write(int c) throws IOException { |
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103 /* buffer up characters till we get a line's worth, then encode |
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104 * and write them out. Max number of characters allowed per |
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105 * line is 45. |
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106 */ |
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107 buffer[bufsize++] = (byte)c; |
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108 if (bufsize == 45) { |
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109 writePrefix(); |
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110 encode(); |
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111 bufsize = 0; |
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112 } |
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113 } |
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114 |
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115 public void flush() throws IOException { |
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116 if (bufsize > 0) { // If there's unencoded characters in the buffer |
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117 writePrefix(); |
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118 encode(); // .. encode them |
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119 } |
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120 writeSuffix(); |
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121 out.flush(); |
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122 } |
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123 |
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124 public void close() throws IOException { |
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125 flush(); |
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126 out.close(); |
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127 } |
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128 |
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129 /** |
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130 * Write out the prefix: "begin <mode> <name>" |
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131 */ |
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132 private void writePrefix() throws IOException { |
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133 if (!wrotePrefix) { |
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134 PrintStream ps = new PrintStream(out); |
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135 ps.println("begin " + mode + " " + name); |
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136 ps.flush(); |
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137 wrotePrefix = true; |
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138 } |
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139 } |
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140 |
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141 /** |
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142 * Write a single line containing space and the suffix line |
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143 * containing the single word "end" (terminated by a newline) |
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144 */ |
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145 private void writeSuffix() throws IOException { |
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146 PrintStream ps = new PrintStream(out); |
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147 ps.println(" \nend"); |
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148 ps.flush(); |
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149 } |
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150 |
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151 /** |
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152 * Encode a line. |
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153 * Start off with the character count, followed by the encoded atoms |
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154 * and terminate with LF. (or is it CRLF or the local line-terminator ?) |
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155 * Take three bytes and encodes them into 4 characters |
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156 * If bufsize if not a multiple of 3, the remaining bytes are filled |
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157 * with '1'. This insures that the last line won't end in spaces |
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158 * and potentiallly be truncated. |
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159 */ |
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160 private void encode() throws IOException { |
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161 byte a, b, c; |
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162 int c1, c2, c3, c4; |
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163 int i = 0; |
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164 |
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165 // Start off with the count of characters in the line |
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166 out.write((bufsize & 0x3f) + ' '); |
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167 |
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168 while (i < bufsize) { |
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169 a = buffer[i++]; |
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170 if (i < bufsize) { |
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171 b = buffer[i++]; |
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172 if (i < bufsize) |
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173 c = buffer[i++]; |
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174 else // default c to 1 |
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175 c = 1; |
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176 } |
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177 else { // default b & c to 1 |
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178 b = 1; |
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179 c = 1; |
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180 } |
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181 |
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182 c1 = (a >>> 2) & 0x3f; |
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183 c2 = ((a << 4) & 0x30) | ((b >>> 4) & 0xf); |
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184 c3 = ((b << 2) & 0x3c) | ((c >>> 6) & 0x3); |
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185 c4 = c & 0x3f; |
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186 out.write(c1 + ' '); |
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187 out.write(c2 + ' '); |
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188 out.write(c3 + ' '); |
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189 out.write(c4 + ' '); |
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190 } |
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191 // Terminate with LF. (should it be CRLF or local line-terminator ?) |
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192 out.write('\n'); |
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193 } |
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194 |
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195 /**** begin TEST program ***** |
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196 public static void main(String argv[]) throws Exception { |
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197 FileInputStream infile = new FileInputStream(argv[0]); |
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198 UUEncoderStream encoder = new UUEncoderStream(System.out); |
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199 int c; |
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200 |
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201 while ((c = infile.read()) != -1) |
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202 encoder.write(c); |
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203 encoder.close(); |
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204 } |
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205 **** end TEST program *****/ |
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206 } |
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