tohtmlstream.java

来自「Mobile 应用程序使用 Java Micro Edition (Java M」· Java 代码 · 共 1,824 行 · 第 1/5 页

     * with <CODE>%HH</CODE>, where HH is the hex of the byte value.
     *
     * @param   string      String to convert to XML format.
     * @param doURLEscaping True if we should try to encode as 
     *                      per http://www.ietf.org/rfc/rfc2396.txt.
     *
     * @throws org.xml.sax.SAXException if a bad surrogate pair is detected.
     */
    public void writeAttrURI(
        final java.io.Writer writer, String string, boolean doURLEscaping)
        throws IOException
    {
        // http://www.ietf.org/rfc/rfc2396.txt says:
        // A URI is always in an "escaped" form, since escaping or unescaping a
        // completed URI might change its semantics.  Normally, the only time
        // escape encodings can safely be made is when the URI is being created
        // from its component parts; each component may have its own set of
        // characters that are reserved, so only the mechanism responsible for
        // generating or interpreting that component can determine whether or
        // not escaping a character will change its semantics. Likewise, a URI
        // must be separated into its components before the escaped characters
        // within those components can be safely decoded.
        //
        // ...So we do our best to do limited escaping of the URL, without 
        // causing damage.  If the URL is already properly escaped, in theory, this 
        // function should not change the string value.

        final int end = string.length();
        if (end > m_attrBuff.length)
        {
           m_attrBuff = new char[end*2 + 1];               
        }
        string.getChars(0,end, m_attrBuff, 0); 
        final char[] chars = m_attrBuff;

        int cleanStart = 0;
        int cleanLength = 0;
        
        
        char ch = 0;
        for (int i = 0; i < end; i++)
        {
            ch = chars[i];

            if ((ch < 32) || (ch > 126))
            {
                if (cleanLength > 0)
                {
                    writer.write(chars, cleanStart, cleanLength);
                    cleanLength = 0;
                }
                if (doURLEscaping)
                {
                    // Encode UTF16 to UTF8.
                    // Reference is Unicode, A Primer, by Tony Graham.
                    // Page 92.

                    // Note that Kay doesn't escape 0x20...
                    //  if(ch == 0x20) // Not sure about this... -sb
                    //  {
                    //    writer.write(ch);
                    //  }
                    //  else 
                    if (ch <= 0x7F)
                    {
                        writer.write('%');
                        writer.write(makeHHString(ch));
                    }
                    else if (ch <= 0x7FF)
                    {
                        // Clear low 6 bits before rotate, put high 4 bits in low byte, 
                        // and set two high bits.
                        int high = (ch >> 6) | 0xC0;
                        int low = (ch & 0x3F) | 0x80;
                        // First 6 bits, + high bit
                        writer.write('%');
                        writer.write(makeHHString(high));
                        writer.write('%');
                        writer.write(makeHHString(low));
                    }
                    else if (Encodings.isHighUTF16Surrogate(ch)) // high surrogate
                    {
                        // I'm sure this can be done in 3 instructions, but I choose 
                        // to try and do it exactly like it is done in the book, at least 
                        // until we are sure this is totally clean.  I don't think performance 
                        // is a big issue with this particular function, though I could be 
                        // wrong.  Also, the stuff below clearly does more masking than 
                        // it needs to do.

                        // Clear high 6 bits.
                        int highSurrogate = ((int) ch) & 0x03FF;

                        // Middle 4 bits (wwww) + 1
                        // "Note that the value of wwww from the high surrogate bit pattern
                        // is incremented to make the uuuuu bit pattern in the scalar value 
                        // so the surrogate pair don't address the BMP."
                        int wwww = ((highSurrogate & 0x03C0) >> 6);
                        int uuuuu = wwww + 1;

                        // next 4 bits
                        int zzzz = (highSurrogate & 0x003C) >> 2;

                        // low 2 bits
                        int yyyyyy = ((highSurrogate & 0x0003) << 4) & 0x30;

                        // Get low surrogate character.
                        ch = chars[++i];

                        // Clear high 6 bits.
                        int lowSurrogate = ((int) ch) & 0x03FF;

                        // put the middle 4 bits into the bottom of yyyyyy (byte 3)
                        yyyyyy = yyyyyy | ((lowSurrogate & 0x03C0) >> 6);

                        // bottom 6 bits.
                        int xxxxxx = (lowSurrogate & 0x003F);

                        int byte1 = 0xF0 | (uuuuu >> 2); // top 3 bits of uuuuu
                        int byte2 =
                            0x80 | (((uuuuu & 0x03) << 4) & 0x30) | zzzz;
                        int byte3 = 0x80 | yyyyyy;
                        int byte4 = 0x80 | xxxxxx;

                        writer.write('%');
                        writer.write(makeHHString(byte1));
                        writer.write('%');
                        writer.write(makeHHString(byte2));
                        writer.write('%');
                        writer.write(makeHHString(byte3));
                        writer.write('%');
                        writer.write(makeHHString(byte4));
                    }
                    else
                    {
                        int high = (ch >> 12) | 0xE0; // top 4 bits
                        int middle = ((ch & 0x0FC0) >> 6) | 0x80;
                        // middle 6 bits
                        int low = (ch & 0x3F) | 0x80;
                        // First 6 bits, + high bit
                        writer.write('%');
                        writer.write(makeHHString(high));
                        writer.write('%');
                        writer.write(makeHHString(middle));
                        writer.write('%');
                        writer.write(makeHHString(low));
                    }

                }
                else if (escapingNotNeeded(ch))
                {
                    writer.write(ch);
                }
                else
                {
                    writer.write("&#");
                    writer.write(Integer.toString(ch));
                    writer.write(';');
                }
                // In this character range we have first written out any previously accumulated 
                // "clean" characters, then processed the current more complicated character,
                // which may have incremented "i".
                // We now we reset the next possible clean character.
                cleanStart = i + 1;
            }
            // Since http://www.ietf.org/rfc/rfc2396.txt refers to the URI grammar as
            // not allowing quotes in the URI proper syntax, nor in the fragment 
            // identifier, we believe that it's OK to double escape quotes.
            else if (ch == '"')
            {
                // If the character is a '%' number number, try to avoid double-escaping.
                // There is a question if this is legal behavior.

                // Dmitri Ilyin: to check if '%' number number is invalid. It must be checked if %xx is a sign, that would be encoded
                // The encoded signes are in Hex form. So %xx my be in form %3C that is "<" sign. I will try to change here a little.

                //        if( ((i+2) < len) && isASCIIDigit(stringArray[i+1]) && isASCIIDigit(stringArray[i+2]) )

                // We are no longer escaping '%'

                if (cleanLength > 0)
                {
                    writer.write(chars, cleanStart, cleanLength);
                    cleanLength = 0;
                }   
                
                
                // Mike Kay encodes this as &#34;, so he may know something I don't?
                if (doURLEscaping)
                    writer.write("%22");
                else
                    writer.write("&quot;"); // we have to escape this, I guess.

                // We have written out any clean characters, then the escaped '%' and now we
                // We now we reset the next possible clean character.
                cleanStart = i + 1;    
            }
            else
            {
                // no processing for this character, just count how
                // many characters in a row that we have that need no processing
                cleanLength++;
            }
        }
        
        // are there any clean characters at the end of the array
        // that we haven't processed yet?
        if (cleanLength > 1)
        {
            // if the whole string can be written out as-is do so
            // otherwise write out the clean chars at the end of the
            // array
            if (cleanStart == 0)
                writer.write(string);
            else
                writer.write(chars, cleanStart, cleanLength);
        }
        else if (cleanLength == 1)
        {
            // a little optimization for 1 clean character
            // (we could have let the previous if(...) handle them all)
            writer.write(ch);
        }
    }

    /**
     * Writes the specified <var>string</var> after substituting <VAR>specials</VAR>,
     * and UTF-16 surrogates for character references <CODE>&amp;#xnn</CODE>.
     *
     * @param   string      String to convert to XML format.
     * @param   encoding    CURRENTLY NOT IMPLEMENTED.
     *
     * @throws org.xml.sax.SAXException
     */
    public void writeAttrString(
        final java.io.Writer writer, String string, String encoding)
        throws IOException
    {
        final int end = string.length();
        if (end > m_attrBuff.length)
        {
            m_attrBuff = new char[end * 2 + 1];
        }
        string.getChars(0, end, m_attrBuff, 0);
        final char[] chars = m_attrBuff;

        

        int cleanStart = 0;
        int cleanLength = 0;

        char ch = 0;
        for (int i = 0; i < end; i++)
        {
            ch = chars[i];

            // System.out.println("SPECIALSSIZE: "+SPECIALSSIZE);
            // System.out.println("ch: "+(int)ch);
            // System.out.println("m_maxCharacter: "+(int)m_maxCharacter);
            // System.out.println("m_attrCharsMap[ch]: "+(int)m_attrCharsMap[ch]);
            if (escapingNotNeeded(ch) && (!m_charInfo.isSpecialAttrChar(ch)))
            {
                cleanLength++;
            }
            else if ('<' == ch || '>' == ch)
            {
                cleanLength++; // no escaping in this case, as specified in 15.2
            }
            else if (
                ('&' == ch) && ((i + 1) < end) && ('{' == chars[i + 1]))
            {
                cleanLength++; // no escaping in this case, as specified in 15.2
            }
            else
            {
                if (cleanLength > 0)
                {
                    writer.write(chars,cleanStart,cleanLength);
                    cleanLength = 0;
                }
                int pos = accumDefaultEntity(writer, ch, i, chars, end, false, true);

                if (i != pos)
                {
                    i = pos - 1;
                }
                else
                {
                    if (Encodings.isHighUTF16Surrogate(ch))
                    {
 
                            writeUTF16Surrogate(ch, chars, i, end);
                            i++; // two input characters processed
                                 // this increments by one and the for()
                                 // loop itself increments by another one.
                    }

                    // The next is kind of a hack to keep from escaping in the case 
                    // of Shift_JIS and the like.

                    /*
                    else if ((ch < m_maxCharacter) && (m_maxCharacter == 0xFFFF)
                    && (ch != 160))
                    {
                    writer.write(ch);  // no escaping in this case
                    }
                    else
                    */
                    String outputStringForChar = m_charInfo.getOutputStringForChar(ch);
                    if (null != outputStringForChar)
                    {
                        writer.write(outputStringForChar);
                    }
                    else if (escapingNotNeeded(ch))
                    {
                        writer.write(ch); // no escaping in this case
                    }
                    else
                    {
                        writer.write("&#");
                        writer.write(Integer.toString(ch));
                        writer.write(';');
                    }
                }
                cleanStart = i + 1;
            }
        } // end of for()
        
        // are there any clean characters at the end of the array
        // that we haven't processed yet?
        if (cleanLength > 1)
        {
            // if the whole string can be written out as-is do so
            // otherwise write out the clean chars at the end of the
            // array
            if (cleanStart == 0)
                writer.write(string);
            else
                writer.write(chars, cleanStart, cleanLength);
        }
        else if (cleanLength == 1)
        {
            // a little optimization for 1 clean character
            // (we could have let the previous if(...) handle them all)
            writer.write(ch);
        }
    }



    /**
     * Receive notification of character data.
     *
     * <p>The Parser will call this method to report each chunk of
     * character data.  SAX parsers may return all contiguous character
     * data in a single chunk, or they may split it into several
     * chunks; however, all of the characters in any single event
     * must come from the same external entity, so that the Locator
     * provides useful information.</p>
     *
     * <p>The application must not attempt to read from the array
     * outside of the specified range.</p>
     *
     * <p>Note that some parsers will report whitespace using the
     * ignorableWhitespace() method rather than this one (validating
     * parsers must do so).</p>