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1 /* |
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2 * Copyright (c) 1997, 2012, 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 * @(#)QPEncoderStream.java 1.6 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 Quoted Printable Encoder. 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 QPEncoderStream extends FilterOutputStream { |
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46 private int count = 0; // number of bytes that have been output |
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47 private int bytesPerLine; // number of bytes per line |
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48 private boolean gotSpace = false; |
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49 private boolean gotCR = false; |
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50 |
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51 /** |
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52 * Create a QP encoder that encodes the specified input stream |
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53 * @param out the output stream |
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54 * @param bytesPerLine the number of bytes per line. The encoder |
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55 * inserts a CRLF sequence after this many number |
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56 * of bytes. |
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57 */ |
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58 public QPEncoderStream(OutputStream out, int bytesPerLine) { |
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59 super(out); |
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60 // Subtract 1 to account for the '=' in the soft-return |
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61 // at the end of a line |
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62 this.bytesPerLine = bytesPerLine - 1; |
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63 } |
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64 |
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65 /** |
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66 * Create a QP encoder that encodes the specified input stream. |
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67 * Inserts the CRLF sequence after outputting 76 bytes. |
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68 * @param out the output stream |
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69 */ |
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70 public QPEncoderStream(OutputStream out) { |
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71 this(out, 76); |
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72 } |
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73 |
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74 /** |
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75 * Encodes <code>len</code> bytes from the specified |
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76 * <code>byte</code> array starting at offset <code>off</code> to |
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77 * this output stream. |
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78 * |
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79 * @param b the data. |
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80 * @param off the start offset in the data. |
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81 * @param len the number of bytes to write. |
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82 * @exception IOException if an I/O error occurs. |
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83 */ |
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84 public void write(byte[] b, int off, int len) throws IOException { |
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85 for (int i = 0; i < len; i++) |
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86 write(b[off + i]); |
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87 } |
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88 |
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89 /** |
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90 * Encodes <code>b.length</code> bytes to this output stream. |
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91 * @param b the data to be written. |
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92 * @exception IOException if an I/O error occurs. |
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93 */ |
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94 public void write(byte[] b) throws IOException { |
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95 write(b, 0, b.length); |
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96 } |
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97 |
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98 /** |
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99 * Encodes the specified <code>byte</code> to this output stream. |
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100 * @param c the <code>byte</code>. |
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101 * @exception IOException if an I/O error occurs. |
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102 */ |
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103 public void write(int c) throws IOException { |
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104 c = c & 0xff; // Turn off the MSB. |
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105 if (gotSpace) { // previous character was <SPACE> |
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106 if (c == '\r' || c == '\n') |
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107 // if CR/LF, we need to encode the <SPACE> char |
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108 output(' ', true); |
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109 else // no encoding required, just output the char |
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110 output(' ', false); |
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111 gotSpace = false; |
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112 } |
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113 |
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114 if (c == '\r') { |
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115 gotCR = true; |
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116 outputCRLF(); |
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117 } else { |
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118 if (c == '\n') { |
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119 if (gotCR) |
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120 // This is a CRLF sequence, we already output the |
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121 // corresponding CRLF when we got the CR, so ignore this |
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122 ; |
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123 else |
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124 outputCRLF(); |
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125 } else if (c == ' ') { |
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126 gotSpace = true; |
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127 } else if (c < 040 || c >= 0177 || c == '=') |
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128 // Encoding required. |
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129 output(c, true); |
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130 else // No encoding required |
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131 output(c, false); |
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132 // whatever it was, it wasn't a CR |
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133 gotCR = false; |
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134 } |
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135 } |
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136 |
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137 /** |
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138 * Flushes this output stream and forces any buffered output bytes |
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139 * to be encoded out to the stream. |
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140 * @exception IOException if an I/O error occurs. |
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141 */ |
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142 public void flush() throws IOException { |
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143 out.flush(); |
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144 } |
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145 |
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146 /** |
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147 * Forces any buffered output bytes to be encoded out to the stream |
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148 * and closes this output stream |
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149 */ |
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150 public void close() throws IOException { |
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151 out.close(); |
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152 } |
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153 |
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154 private void outputCRLF() throws IOException { |
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155 out.write('\r'); |
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156 out.write('\n'); |
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157 count = 0; |
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158 } |
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159 |
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160 // The encoding table |
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161 private final static char hex[] = { |
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162 '0','1', '2', '3', '4', '5', '6', '7', |
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163 '8','9', 'A', 'B', 'C', 'D', 'E', 'F' |
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164 }; |
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165 |
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166 protected void output(int c, boolean encode) throws IOException { |
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167 if (encode) { |
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168 if ((count += 3) > bytesPerLine) { |
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169 out.write('='); |
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170 out.write('\r'); |
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171 out.write('\n'); |
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172 count = 3; // set the next line's length |
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173 } |
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174 out.write('='); |
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175 out.write(hex[c >> 4]); |
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176 out.write(hex[c & 0xf]); |
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177 } else { |
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178 if (++count > bytesPerLine) { |
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179 out.write('='); |
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180 out.write('\r'); |
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181 out.write('\n'); |
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182 count = 1; // set the next line's length |
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183 } |
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184 out.write(c); |
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185 } |
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186 } |
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187 |
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188 /**** begin TEST program *** |
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189 public static void main(String argv[]) throws Exception { |
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190 FileInputStream infile = new FileInputStream(argv[0]); |
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191 QPEncoderStream encoder = new QPEncoderStream(System.out); |
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192 int c; |
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193 |
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194 while ((c = infile.read()) != -1) |
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195 encoder.write(c); |
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196 encoder.close(); |
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197 } |
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198 *** end TEST program ***/ |
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199 } |