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annotate src/org/eclipse/jetty/server/HttpWriter.java @ 848:22a4e93ed20e

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author Franklin Schmidt <fschmidt@gmail.com>
date Mon, 19 Sep 2016 16:38:36 -0600
parents 3428c60d7cfc
children 23ec25435b8c
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1 //
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2 // ========================================================================
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3 // Copyright (c) 1995-2014 Mort Bay Consulting Pty. Ltd.
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4 // ------------------------------------------------------------------------
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5 // All rights reserved. This program and the accompanying materials
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6 // are made available under the terms of the Eclipse Public License v1.0
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7 // and Apache License v2.0 which accompanies this distribution.
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8 //
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9 // The Eclipse Public License is available at
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10 // http://www.eclipse.org/legal/epl-v10.html
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11 //
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12 // The Apache License v2.0 is available at
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13 // http://www.opensource.org/licenses/apache2.0.php
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14 //
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15 // You may elect to redistribute this code under either of these licenses.
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16 // ========================================================================
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17 //
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18
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19 package org.eclipse.jetty.server;
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20
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21 import java.io.IOException;
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22 import java.io.OutputStreamWriter;
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23 import java.io.Writer;
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24
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25 import org.eclipse.jetty.http.AbstractGenerator;
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26 import org.eclipse.jetty.util.ByteArrayOutputStream2;
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27 import org.eclipse.jetty.util.StringUtil;
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28
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29 /** OutputWriter.
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30 * A writer that can wrap a {@link HttpOutput} stream and provide
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31 * character encodings.
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32 *
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33 * The UTF-8 encoding is done by this class and no additional
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34 * buffers or Writers are used.
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35 * The UTF-8 code was inspired by http://javolution.org
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36 */
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37 public class HttpWriter extends Writer
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38 {
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39 public static final int MAX_OUTPUT_CHARS = 512;
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40
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41 private static final int WRITE_CONV = 0;
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42 private static final int WRITE_ISO1 = 1;
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43 private static final int WRITE_UTF8 = 2;
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44
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45 final HttpOutput _out;
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46 final AbstractGenerator _generator;
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47 int _writeMode;
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48 int _surrogate;
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49
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50 /* ------------------------------------------------------------ */
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51 public HttpWriter(HttpOutput out)
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52 {
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53 _out=out;
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54 _generator=_out._generator;
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55 _surrogate=0; // AS lastUTF16CodePoint
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56 }
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57
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58 /* ------------------------------------------------------------ */
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59 public void setCharacterEncoding(String encoding)
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60 {
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61 if (encoding == null || StringUtil.__ISO_8859_1.equalsIgnoreCase(encoding))
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62 {
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63 _writeMode = WRITE_ISO1;
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64 }
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65 else if (StringUtil.__UTF8.equalsIgnoreCase(encoding))
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66 {
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67 _writeMode = WRITE_UTF8;
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68 }
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69 else
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70 {
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71 _writeMode = WRITE_CONV;
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72 if (_out._characterEncoding == null || !_out._characterEncoding.equalsIgnoreCase(encoding))
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73 _out._converter = null; // Set lazily in getConverter()
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74 }
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75
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76 _out._characterEncoding = encoding;
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77 if (_out._bytes==null)
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78 _out._bytes = new ByteArrayOutputStream2(MAX_OUTPUT_CHARS);
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79 }
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80
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81 /* ------------------------------------------------------------ */
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82 @Override
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83 public void close() throws IOException
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84 {
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85 _out.close();
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86 }
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87
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88 /* ------------------------------------------------------------ */
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89 @Override
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90 public void flush() throws IOException
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91 {
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92 _out.flush();
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93 }
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94
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95 /* ------------------------------------------------------------ */
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96 @Override
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97 public void write (String s,int offset, int length) throws IOException
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98 {
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99 while (length > MAX_OUTPUT_CHARS)
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100 {
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101 write(s, offset, MAX_OUTPUT_CHARS);
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102 offset += MAX_OUTPUT_CHARS;
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103 length -= MAX_OUTPUT_CHARS;
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104 }
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105
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106 if (_out._chars==null)
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107 {
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108 _out._chars = new char[MAX_OUTPUT_CHARS];
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109 }
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110 char[] chars = _out._chars;
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111 s.getChars(offset, offset + length, chars, 0);
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112 write(chars, 0, length);
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113 }
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114
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115 /* ------------------------------------------------------------ */
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116 @Override
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117 public void write (char[] s,int offset, int length) throws IOException
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118 {
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119 HttpOutput out = _out;
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120
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121 while (length > 0)
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122 {
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123 out._bytes.reset();
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124 int chars = length>MAX_OUTPUT_CHARS?MAX_OUTPUT_CHARS:length;
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125
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126 switch (_writeMode)
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127 {
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128 case WRITE_CONV:
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129 {
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130 Writer converter=getConverter();
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131 converter.write(s, offset, chars);
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132 converter.flush();
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133 }
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134 break;
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135
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136 case WRITE_ISO1:
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137 {
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138 byte[] buffer=out._bytes.getBuf();
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139 int bytes=out._bytes.getCount();
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140
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141 if (chars>buffer.length-bytes)
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142 chars=buffer.length-bytes;
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143
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144 for (int i = 0; i < chars; i++)
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145 {
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146 int c = s[offset+i];
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147 buffer[bytes++]=(byte)(c<256?c:'?'); // ISO-1 and UTF-8 match for 0 - 255
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148 }
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149 if (bytes>=0)
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150 out._bytes.setCount(bytes);
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151
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152 break;
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153 }
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154
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155 case WRITE_UTF8:
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156 {
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157 byte[] buffer=out._bytes.getBuf();
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158 int bytes=out._bytes.getCount();
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159
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160 if (bytes+chars>buffer.length)
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161 chars=buffer.length-bytes;
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162
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163 for (int i = 0; i < chars; i++)
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164 {
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165 int code = s[offset+i];
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166
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167 // Do we already have a surrogate?
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168 if(_surrogate==0)
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169 {
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170 // No - is this char code a surrogate?
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171 if(Character.isHighSurrogate((char)code))
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172 {
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173 _surrogate=code; // UCS-?
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174 continue;
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175 }
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176 }
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177 // else handle a low surrogate
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178 else if(Character.isLowSurrogate((char)code))
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179 {
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180 code = Character.toCodePoint((char)_surrogate, (char)code); // UCS-4
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181 }
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182 // else UCS-2
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183 else
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184 {
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185 code=_surrogate; // UCS-2
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186 _surrogate=0; // USED
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187 i--;
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188 }
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189
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190 if ((code & 0xffffff80) == 0)
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191 {
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192 // 1b
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193 if (bytes>=buffer.length)
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194 {
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195 chars=i;
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196 break;
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197 }
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198 buffer[bytes++]=(byte)(code);
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199 }
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200 else
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201 {
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202 if((code&0xfffff800)==0)
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203 {
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204 // 2b
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205 if (bytes+2>buffer.length)
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206 {
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207 chars=i;
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208 break;
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209 }
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210 buffer[bytes++]=(byte)(0xc0|(code>>6));
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211 buffer[bytes++]=(byte)(0x80|(code&0x3f));
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212 }
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213 else if((code&0xffff0000)==0)
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214 {
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215 // 3b
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216 if (bytes+3>buffer.length)
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217 {
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218 chars=i;
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219 break;
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220 }
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221 buffer[bytes++]=(byte)(0xe0|(code>>12));
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222 buffer[bytes++]=(byte)(0x80|((code>>6)&0x3f));
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223 buffer[bytes++]=(byte)(0x80|(code&0x3f));
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224 }
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225 else if((code&0xff200000)==0)
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226 {
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227 // 4b
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228 if (bytes+4>buffer.length)
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229 {
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230 chars=i;
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231 break;
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232 }
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233 buffer[bytes++]=(byte)(0xf0|(code>>18));
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234 buffer[bytes++]=(byte)(0x80|((code>>12)&0x3f));
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235 buffer[bytes++]=(byte)(0x80|((code>>6)&0x3f));
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236 buffer[bytes++]=(byte)(0x80|(code&0x3f));
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237 }
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238 else if((code&0xf4000000)==0)
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239 {
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240 // 5b
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241 if (bytes+5>buffer.length)
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242 {
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243 chars=i;
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244 break;
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245 }
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246 buffer[bytes++]=(byte)(0xf8|(code>>24));
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247 buffer[bytes++]=(byte)(0x80|((code>>18)&0x3f));
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diff changeset
248 buffer[bytes++]=(byte)(0x80|((code>>12)&0x3f));
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249 buffer[bytes++]=(byte)(0x80|((code>>6)&0x3f));
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250 buffer[bytes++]=(byte)(0x80|(code&0x3f));
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251 }
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252 else if((code&0x80000000)==0)
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253 {
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254 // 6b
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255 if (bytes+6>buffer.length)
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256 {
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257 chars=i;
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diff changeset
258 break;
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diff changeset
259 }
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diff changeset
260 buffer[bytes++]=(byte)(0xfc|(code>>30));
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diff changeset
261 buffer[bytes++]=(byte)(0x80|((code>>24)&0x3f));
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diff changeset
262 buffer[bytes++]=(byte)(0x80|((code>>18)&0x3f));
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diff changeset
263 buffer[bytes++]=(byte)(0x80|((code>>12)&0x3f));
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diff changeset
264 buffer[bytes++]=(byte)(0x80|((code>>6)&0x3f));
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diff changeset
265 buffer[bytes++]=(byte)(0x80|(code&0x3f));
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266 }
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diff changeset
267 else
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268 {
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269 buffer[bytes++]=(byte)('?');
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diff changeset
270 }
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271
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diff changeset
272 _surrogate=0; // USED
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diff changeset
273
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diff changeset
274 if (bytes==buffer.length)
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diff changeset
275 {
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diff changeset
276 chars=i+1;
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diff changeset
277 break;
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278 }
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279 }
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diff changeset
280 }
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diff changeset
281 out._bytes.setCount(bytes);
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282 break;
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283 }
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diff changeset
284 default:
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285 throw new IllegalStateException();
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diff changeset
286 }
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287
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diff changeset
288 out._bytes.writeTo(out);
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diff changeset
289 length-=chars;
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diff changeset
290 offset+=chars;
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diff changeset
291 }
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diff changeset
292 }
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293
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294
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diff changeset
295 /* ------------------------------------------------------------ */
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diff changeset
296 private Writer getConverter() throws IOException
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diff changeset
297 {
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298 if (_out._converter == null)
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diff changeset
299 _out._converter = new OutputStreamWriter(_out._bytes, _out._characterEncoding);
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diff changeset
300 return _out._converter;
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diff changeset
301 }
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302 }