| // |
| // ======================================================================== |
| // Copyright (c) 1995-2014 Mort Bay Consulting Pty. Ltd. |
| // ------------------------------------------------------------------------ |
| // All rights reserved. This program and the accompanying materials |
| // are made available under the terms of the Eclipse Public License v1.0 |
| // and Apache License v2.0 which accompanies this distribution. |
| // |
| // The Eclipse Public License is available at |
| // http://www.eclipse.org/legal/epl-v10.html |
| // |
| // The Apache License v2.0 is available at |
| // http://www.opensource.org/licenses/apache2.0.php |
| // |
| // You may elect to redistribute this code under either of these licenses. |
| // ======================================================================== |
| // |
| |
| package org.eclipse.jetty.server; |
| |
| import java.io.IOException; |
| import java.io.OutputStreamWriter; |
| import java.io.Writer; |
| |
| import org.eclipse.jetty.http.AbstractGenerator; |
| import org.eclipse.jetty.util.ByteArrayOutputStream2; |
| import org.eclipse.jetty.util.StringUtil; |
| |
| /** OutputWriter. |
| * A writer that can wrap a {@link HttpOutput} stream and provide |
| * character encodings. |
| * |
| * The UTF-8 encoding is done by this class and no additional |
| * buffers or Writers are used. |
| * The UTF-8 code was inspired by http://javolution.org |
| */ |
| public class HttpWriter extends Writer |
| { |
| public static final int MAX_OUTPUT_CHARS = 512; |
| |
| private static final int WRITE_CONV = 0; |
| private static final int WRITE_ISO1 = 1; |
| private static final int WRITE_UTF8 = 2; |
| |
| final HttpOutput _out; |
| final AbstractGenerator _generator; |
| int _writeMode; |
| int _surrogate; |
| |
| /* ------------------------------------------------------------ */ |
| public HttpWriter(HttpOutput out) |
| { |
| _out=out; |
| _generator=_out._generator; |
| _surrogate=0; // AS lastUTF16CodePoint |
| } |
| |
| /* ------------------------------------------------------------ */ |
| public void setCharacterEncoding(String encoding) |
| { |
| if (encoding == null || StringUtil.__ISO_8859_1.equalsIgnoreCase(encoding)) |
| { |
| _writeMode = WRITE_ISO1; |
| } |
| else if (StringUtil.__UTF8.equalsIgnoreCase(encoding)) |
| { |
| _writeMode = WRITE_UTF8; |
| } |
| else |
| { |
| _writeMode = WRITE_CONV; |
| if (_out._characterEncoding == null || !_out._characterEncoding.equalsIgnoreCase(encoding)) |
| _out._converter = null; // Set lazily in getConverter() |
| } |
| |
| _out._characterEncoding = encoding; |
| if (_out._bytes==null) |
| _out._bytes = new ByteArrayOutputStream2(MAX_OUTPUT_CHARS); |
| } |
| |
| /* ------------------------------------------------------------ */ |
| @Override |
| public void close() throws IOException |
| { |
| _out.close(); |
| } |
| |
| /* ------------------------------------------------------------ */ |
| @Override |
| public void flush() throws IOException |
| { |
| _out.flush(); |
| } |
| |
| /* ------------------------------------------------------------ */ |
| @Override |
| public void write (String s,int offset, int length) throws IOException |
| { |
| while (length > MAX_OUTPUT_CHARS) |
| { |
| write(s, offset, MAX_OUTPUT_CHARS); |
| offset += MAX_OUTPUT_CHARS; |
| length -= MAX_OUTPUT_CHARS; |
| } |
| |
| if (_out._chars==null) |
| { |
| _out._chars = new char[MAX_OUTPUT_CHARS]; |
| } |
| char[] chars = _out._chars; |
| s.getChars(offset, offset + length, chars, 0); |
| write(chars, 0, length); |
| } |
| |
| /* ------------------------------------------------------------ */ |
| @Override |
| public void write (char[] s,int offset, int length) throws IOException |
| { |
| HttpOutput out = _out; |
| |
| while (length > 0) |
| { |
| out._bytes.reset(); |
| int chars = length>MAX_OUTPUT_CHARS?MAX_OUTPUT_CHARS:length; |
| |
| switch (_writeMode) |
| { |
| case WRITE_CONV: |
| { |
| Writer converter=getConverter(); |
| converter.write(s, offset, chars); |
| converter.flush(); |
| } |
| break; |
| |
| case WRITE_ISO1: |
| { |
| byte[] buffer=out._bytes.getBuf(); |
| int bytes=out._bytes.getCount(); |
| |
| if (chars>buffer.length-bytes) |
| chars=buffer.length-bytes; |
| |
| for (int i = 0; i < chars; i++) |
| { |
| int c = s[offset+i]; |
| buffer[bytes++]=(byte)(c<256?c:'?'); // ISO-1 and UTF-8 match for 0 - 255 |
| } |
| if (bytes>=0) |
| out._bytes.setCount(bytes); |
| |
| break; |
| } |
| |
| case WRITE_UTF8: |
| { |
| byte[] buffer=out._bytes.getBuf(); |
| int bytes=out._bytes.getCount(); |
| |
| if (bytes+chars>buffer.length) |
| chars=buffer.length-bytes; |
| |
| for (int i = 0; i < chars; i++) |
| { |
| int code = s[offset+i]; |
| |
| // Do we already have a surrogate? |
| if(_surrogate==0) |
| { |
| // No - is this char code a surrogate? |
| if(Character.isHighSurrogate((char)code)) |
| { |
| _surrogate=code; // UCS-? |
| continue; |
| } |
| } |
| // else handle a low surrogate |
| else if(Character.isLowSurrogate((char)code)) |
| { |
| code = Character.toCodePoint((char)_surrogate, (char)code); // UCS-4 |
| } |
| // else UCS-2 |
| else |
| { |
| code=_surrogate; // UCS-2 |
| _surrogate=0; // USED |
| i--; |
| } |
| |
| if ((code & 0xffffff80) == 0) |
| { |
| // 1b |
| if (bytes>=buffer.length) |
| { |
| chars=i; |
| break; |
| } |
| buffer[bytes++]=(byte)(code); |
| } |
| else |
| { |
| if((code&0xfffff800)==0) |
| { |
| // 2b |
| if (bytes+2>buffer.length) |
| { |
| chars=i; |
| break; |
| } |
| buffer[bytes++]=(byte)(0xc0|(code>>6)); |
| buffer[bytes++]=(byte)(0x80|(code&0x3f)); |
| } |
| else if((code&0xffff0000)==0) |
| { |
| // 3b |
| if (bytes+3>buffer.length) |
| { |
| chars=i; |
| break; |
| } |
| buffer[bytes++]=(byte)(0xe0|(code>>12)); |
| buffer[bytes++]=(byte)(0x80|((code>>6)&0x3f)); |
| buffer[bytes++]=(byte)(0x80|(code&0x3f)); |
| } |
| else if((code&0xff200000)==0) |
| { |
| // 4b |
| if (bytes+4>buffer.length) |
| { |
| chars=i; |
| break; |
| } |
| buffer[bytes++]=(byte)(0xf0|(code>>18)); |
| buffer[bytes++]=(byte)(0x80|((code>>12)&0x3f)); |
| buffer[bytes++]=(byte)(0x80|((code>>6)&0x3f)); |
| buffer[bytes++]=(byte)(0x80|(code&0x3f)); |
| } |
| else if((code&0xf4000000)==0) |
| { |
| // 5b |
| if (bytes+5>buffer.length) |
| { |
| chars=i; |
| break; |
| } |
| buffer[bytes++]=(byte)(0xf8|(code>>24)); |
| buffer[bytes++]=(byte)(0x80|((code>>18)&0x3f)); |
| buffer[bytes++]=(byte)(0x80|((code>>12)&0x3f)); |
| buffer[bytes++]=(byte)(0x80|((code>>6)&0x3f)); |
| buffer[bytes++]=(byte)(0x80|(code&0x3f)); |
| } |
| else if((code&0x80000000)==0) |
| { |
| // 6b |
| if (bytes+6>buffer.length) |
| { |
| chars=i; |
| break; |
| } |
| buffer[bytes++]=(byte)(0xfc|(code>>30)); |
| buffer[bytes++]=(byte)(0x80|((code>>24)&0x3f)); |
| buffer[bytes++]=(byte)(0x80|((code>>18)&0x3f)); |
| buffer[bytes++]=(byte)(0x80|((code>>12)&0x3f)); |
| buffer[bytes++]=(byte)(0x80|((code>>6)&0x3f)); |
| buffer[bytes++]=(byte)(0x80|(code&0x3f)); |
| } |
| else |
| { |
| buffer[bytes++]=(byte)('?'); |
| } |
| |
| _surrogate=0; // USED |
| |
| if (bytes==buffer.length) |
| { |
| chars=i+1; |
| break; |
| } |
| } |
| } |
| out._bytes.setCount(bytes); |
| break; |
| } |
| default: |
| throw new IllegalStateException(); |
| } |
| |
| out._bytes.writeTo(out); |
| length-=chars; |
| offset+=chars; |
| } |
| } |
| |
| |
| /* ------------------------------------------------------------ */ |
| private Writer getConverter() throws IOException |
| { |
| if (_out._converter == null) |
| _out._converter = new OutputStreamWriter(_out._bytes, _out._characterEncoding); |
| return _out._converter; |
| } |
| } |