Importing upstream Jetty jetty-9.2.1.v20140609

[gigi.git] / lib / jetty / org / eclipse / jetty / server / Utf8HttpWriter.java

diff --git a/lib/jetty/org/eclipse/jetty/server/Utf8HttpWriter.java b/lib/jetty/org/eclipse/jetty/server/Utf8HttpWriter.java
new file mode 100644 (file)
index 0000000..cbd1adb
--- /dev/null
+++ b/lib/jetty/org/eclipse/jetty/server/Utf8HttpWriter.java
@@ -0,0 +1,188 @@
+//
+//  ========================================================================
+//  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;
+
+/** 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 Utf8HttpWriter extends HttpWriter
+{
+    int _surrogate=0;
+
+    /* ------------------------------------------------------------ */
+    public Utf8HttpWriter(HttpOutput out)
+    {
+        super(out);
+    }
+
+    /* ------------------------------------------------------------ */
+    @Override
+    public void write (char[] s,int offset, int length) throws IOException
+    {
+        HttpOutput out = _out;
+        if (length==0 && out.isAllContentWritten())
+        {
+            close();
+            return;
+        }
+        
+        while (length > 0)
+        {
+            _bytes.reset();
+            int chars = length>MAX_OUTPUT_CHARS?MAX_OUTPUT_CHARS:length;
+
+            byte[] buffer=_bytes.getBuf();
+            int bytes=_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;
+                    }
+                }
+            }
+            _bytes.setCount(bytes);
+
+            _bytes.writeTo(out);
+            length-=chars;
+            offset+=chars;
+        }
+    }
+}