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annotate src/org/eclipse/jetty/server/HttpWriter.java @ 1019:f126d30e04a4
start replacing BufferCache with StringCache
| author | Franklin Schmidt <fschmidt@gmail.com> |
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| date | Mon, 31 Oct 2016 03:33:42 -0600 |
| parents | 8fef34f665e7 |
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| rev | line source |
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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.HttpGenerator; |
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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. |
| 985 | 30 * A writer that can wrap a {@link AbstractHttpConnection.Output} 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 */ |
| 984 | 37 public final class HttpWriter extends Writer |
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38 { |
| 984 | 39 private static final int MAX_OUTPUT_CHARS = 512; |
| 40 | |
| 41 private static final int WRITE_CONV = 0; | |
| 42 private static final int WRITE_ISO1 = 1; | |
| 43 private static final int WRITE_UTF8 = 2; | |
| 44 | |
| 985 | 45 private final AbstractHttpConnection.Output _out; |
| 984 | 46 private int _writeMode; |
| 47 private int _surrogate; | |
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48 |
| 985 | 49 public HttpWriter(AbstractHttpConnection.Output out) |
| 984 | 50 { |
| 51 _out = out; | |
| 52 _surrogate = 0; // AS lastUTF16CodePoint | |
| 53 } | |
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54 |
| 984 | 55 public void setCharacterEncoding(String encoding) |
| 56 { | |
| 57 if (encoding == null || StringUtil.__ISO_8859_1.equalsIgnoreCase(encoding)) | |
| 58 { | |
| 59 _writeMode = WRITE_ISO1; | |
| 60 } | |
| 61 else if (StringUtil.__UTF8.equalsIgnoreCase(encoding)) | |
| 62 { | |
| 63 _writeMode = WRITE_UTF8; | |
| 64 } | |
| 65 else | |
| 66 { | |
| 67 _writeMode = WRITE_CONV; | |
| 68 if (_out._characterEncoding == null || !_out._characterEncoding.equalsIgnoreCase(encoding)) | |
| 69 _out._converter = null; // Set lazily in getConverter() | |
| 70 } | |
| 71 | |
| 72 _out._characterEncoding = encoding; | |
| 73 if (_out._bytes==null) | |
| 74 _out._bytes = new ByteArrayOutputStream2(MAX_OUTPUT_CHARS); | |
| 75 } | |
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76 |
| 984 | 77 @Override |
| 78 public void close() throws IOException | |
| 79 { | |
| 80 _out.close(); | |
| 81 } | |
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82 |
| 984 | 83 @Override |
| 84 public void flush() throws IOException | |
| 85 { | |
| 86 _out.flush(); | |
| 87 } | |
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88 |
| 984 | 89 @Override |
| 90 public void write (String s,int offset, int length) throws IOException | |
| 91 { | |
| 92 while (length > MAX_OUTPUT_CHARS) | |
| 93 { | |
| 94 write(s, offset, MAX_OUTPUT_CHARS); | |
| 95 offset += MAX_OUTPUT_CHARS; | |
| 96 length -= MAX_OUTPUT_CHARS; | |
| 97 } | |
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98 |
| 984 | 99 if (_out._chars==null) |
| 100 { | |
| 101 _out._chars = new char[MAX_OUTPUT_CHARS]; | |
| 102 } | |
| 103 char[] chars = _out._chars; | |
| 104 s.getChars(offset, offset + length, chars, 0); | |
| 105 write(chars, 0, length); | |
| 106 } | |
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107 |
| 984 | 108 @Override |
| 109 public void write (char[] s,int offset, int length) throws IOException | |
| 110 { | |
| 111 while (length > 0) | |
| 112 { | |
| 985 | 113 _out._bytes.reset(); |
| 984 | 114 int chars = length>MAX_OUTPUT_CHARS?MAX_OUTPUT_CHARS:length; |
| 115 | |
| 116 switch (_writeMode) | |
| 117 { | |
| 118 case WRITE_CONV: | |
| 119 { | |
| 120 Writer converter = getConverter(); | |
| 121 converter.write(s, offset, chars); | |
| 122 converter.flush(); | |
| 123 } | |
| 124 break; | |
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125 |
| 984 | 126 case WRITE_ISO1: |
| 127 { | |
| 985 | 128 byte[] buffer = _out._bytes.getBuf(); |
| 129 int bytes = _out._bytes.getCount(); | |
| 984 | 130 |
| 131 if (chars>buffer.length-bytes) | |
| 132 chars=buffer.length-bytes; | |
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133 |
| 984 | 134 for (int i = 0; i < chars; i++) |
| 135 { | |
| 136 int c = s[offset+i]; | |
| 137 buffer[bytes++]=(byte)(c<256?c:'?'); // ISO-1 and UTF-8 match for 0 - 255 | |
| 138 } | |
| 139 if (bytes>=0) | |
| 985 | 140 _out._bytes.setCount(bytes); |
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141 |
| 984 | 142 break; |
| 143 } | |
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144 |
| 984 | 145 case WRITE_UTF8: |
| 146 { | |
| 985 | 147 byte[] buffer = _out._bytes.getBuf(); |
| 148 int bytes = _out._bytes.getCount(); | |
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149 |
| 984 | 150 if (bytes+chars>buffer.length) |
| 151 chars=buffer.length-bytes; | |
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152 |
| 984 | 153 for (int i = 0; i < chars; i++) |
| 154 { | |
| 155 int code = s[offset+i]; | |
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156 |
| 984 | 157 // Do we already have a surrogate? |
| 158 if(_surrogate==0) | |
| 159 { | |
| 160 // No - is this char code a surrogate? | |
| 161 if(Character.isHighSurrogate((char)code)) | |
| 162 { | |
| 163 _surrogate=code; // UCS-? | |
| 164 continue; | |
| 165 } | |
| 166 } | |
| 167 // else handle a low surrogate | |
| 168 else if(Character.isLowSurrogate((char)code)) | |
| 169 { | |
| 170 code = Character.toCodePoint((char)_surrogate, (char)code); // UCS-4 | |
| 171 } | |
| 172 // else UCS-2 | |
| 173 else | |
| 174 { | |
| 175 code=_surrogate; // UCS-2 | |
| 176 _surrogate=0; // USED | |
| 177 i--; | |
| 178 } | |
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179 |
| 984 | 180 if ((code & 0xffffff80) == 0) |
| 181 { | |
| 182 // 1b | |
| 183 if (bytes>=buffer.length) | |
| 184 { | |
| 185 chars=i; | |
| 186 break; | |
| 187 } | |
| 188 buffer[bytes++]=(byte)(code); | |
| 189 } | |
| 190 else | |
| 191 { | |
| 192 if((code&0xfffff800)==0) | |
| 193 { | |
| 194 // 2b | |
| 195 if (bytes+2>buffer.length) | |
| 196 { | |
| 197 chars=i; | |
| 198 break; | |
| 199 } | |
| 200 buffer[bytes++]=(byte)(0xc0|(code>>6)); | |
| 201 buffer[bytes++]=(byte)(0x80|(code&0x3f)); | |
| 202 } | |
| 203 else if((code&0xffff0000)==0) | |
| 204 { | |
| 205 // 3b | |
| 206 if (bytes+3>buffer.length) | |
| 207 { | |
| 208 chars=i; | |
| 209 break; | |
| 210 } | |
| 211 buffer[bytes++]=(byte)(0xe0|(code>>12)); | |
| 212 buffer[bytes++]=(byte)(0x80|((code>>6)&0x3f)); | |
| 213 buffer[bytes++]=(byte)(0x80|(code&0x3f)); | |
| 214 } | |
| 215 else if((code&0xff200000)==0) | |
| 216 { | |
| 217 // 4b | |
| 218 if (bytes+4>buffer.length) | |
| 219 { | |
| 220 chars=i; | |
| 221 break; | |
| 222 } | |
| 223 buffer[bytes++]=(byte)(0xf0|(code>>18)); | |
| 224 buffer[bytes++]=(byte)(0x80|((code>>12)&0x3f)); | |
| 225 buffer[bytes++]=(byte)(0x80|((code>>6)&0x3f)); | |
| 226 buffer[bytes++]=(byte)(0x80|(code&0x3f)); | |
| 227 } | |
| 228 else if((code&0xf4000000)==0) | |
| 229 { | |
| 230 // 5b | |
| 231 if (bytes+5>buffer.length) | |
| 232 { | |
| 233 chars=i; | |
| 234 break; | |
| 235 } | |
| 236 buffer[bytes++]=(byte)(0xf8|(code>>24)); | |
| 237 buffer[bytes++]=(byte)(0x80|((code>>18)&0x3f)); | |
| 238 buffer[bytes++]=(byte)(0x80|((code>>12)&0x3f)); | |
| 239 buffer[bytes++]=(byte)(0x80|((code>>6)&0x3f)); | |
| 240 buffer[bytes++]=(byte)(0x80|(code&0x3f)); | |
| 241 } | |
| 242 else if((code&0x80000000)==0) | |
| 243 { | |
| 244 // 6b | |
| 245 if (bytes+6>buffer.length) | |
| 246 { | |
| 247 chars=i; | |
| 248 break; | |
| 249 } | |
| 250 buffer[bytes++]=(byte)(0xfc|(code>>30)); | |
| 251 buffer[bytes++]=(byte)(0x80|((code>>24)&0x3f)); | |
| 252 buffer[bytes++]=(byte)(0x80|((code>>18)&0x3f)); | |
| 253 buffer[bytes++]=(byte)(0x80|((code>>12)&0x3f)); | |
| 254 buffer[bytes++]=(byte)(0x80|((code>>6)&0x3f)); | |
| 255 buffer[bytes++]=(byte)(0x80|(code&0x3f)); | |
| 256 } | |
| 257 else | |
| 258 { | |
| 259 buffer[bytes++]=(byte)('?'); | |
| 260 } | |
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261 |
| 984 | 262 _surrogate=0; // USED |
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263 |
| 984 | 264 if (bytes==buffer.length) |
| 265 { | |
| 266 chars=i+1; | |
| 267 break; | |
| 268 } | |
| 269 } | |
| 270 } | |
| 985 | 271 _out._bytes.setCount(bytes); |
| 984 | 272 break; |
| 273 } | |
| 274 default: | |
| 275 throw new IllegalStateException(); | |
| 276 } | |
| 277 | |
| 985 | 278 _out._bytes.writeTo(_out); |
| 984 | 279 length-=chars; |
| 280 offset+=chars; | |
| 281 } | |
| 282 } | |
| 283 | |
| 284 private Writer getConverter() throws IOException | |
| 285 { | |
| 286 if (_out._converter == null) | |
| 287 _out._converter = new OutputStreamWriter(_out._bytes, _out._characterEncoding); | |
| 288 return _out._converter; | |
| 289 } | |
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290 } |