truetypefontunicode.java

iText是一个能够快速产生PDF文件的java类库。iText的java类对于那些要产生包含文本

            boolean firstTime = true;
            for (int k = 0; k < metrics.length; ++k) {
                int metric[] = (int[])metrics[k];
                if (metric[1] == 1000)
                    continue;
                int m = metric[0];
                if (m == lastNumber + 1) {
                    buf.append(' ').append(metric[1]);
                }
                else {
                    if (!firstTime) {
                        buf.append(']');
                    }
                    firstTime = false;
                    buf.append(m).append('[').append(metric[1]);
                }
                lastNumber = m;
            }
            if (buf.length() > 1) {
                buf.append("]]");
                dic.put(PdfName.W, new PdfLiteral(buf.toString()));
            }
        }
        return dic;
    }
    
    /** Generates the font dictionary.
     * @param descendant the descendant dictionary
     * @param subsetPrefix the subset prefix
     * @param toUnicode the ToUnicode stream
     * @return the stream
     */    
    private PdfDictionary getFontBaseType(PdfIndirectReference descendant, String subsetPrefix, PdfIndirectReference toUnicode) {
        PdfDictionary dic = new PdfDictionary(PdfName.FONT);

        dic.put(PdfName.SUBTYPE, PdfName.TYPE0);
        // The PDF Reference manual advises to add -encoding to CID font names
		if (cff)
		  dic.put(PdfName.BASEFONT, new PdfName(subsetPrefix+fontName+"-"+encoding));
		  //dic.put(PdfName.BASEFONT, new PdfName(subsetPrefix+fontName));
		else
		  dic.put(PdfName.BASEFONT, new PdfName(subsetPrefix + fontName));
		  //dic.put(PdfName.BASEFONT, new PdfName(fontName));
        dic.put(PdfName.ENCODING, new PdfName(encoding));
        dic.put(PdfName.DESCENDANTFONTS, new PdfArray(descendant));
        if (toUnicode != null)
            dic.put(PdfName.TOUNICODE, toUnicode);  
        return dic;
    }

    /** The method used to sort the metrics array.
     * @param o1 the first element
     * @param o2 the second element
     * @return the comparisation
     */    
    public int compare(Object o1, Object o2) {
        int m1 = ((int[])o1)[0];
        int m2 = ((int[])o2)[0];
        if (m1 < m2)
            return -1;
        if (m1 == m2)
            return 0;
        return 1;
    }
    
    /** Outputs to the writer the font dictionaries and streams.
     * @param writer the writer for this document
     * @param ref the font indirect reference
     * @param params several parameters that depend on the font type
     * @throws IOException on error
     * @throws DocumentException error in generating the object
     */
    void writeFont(PdfWriter writer, PdfIndirectReference ref, Object params[]) throws DocumentException, IOException {
        HashMap longTag = (HashMap)params[0];
        addRangeUni(longTag, true, subset);
        Object metrics[] = longTag.values().toArray();
        Arrays.sort(metrics, this);
        PdfIndirectReference ind_font = null;
        PdfObject pobj = null;
        PdfIndirectObject obj = null;
        // sivan: cff
        if (cff) {
			RandomAccessFileOrArray rf2 = new RandomAccessFileOrArray(rf);
			byte b[] = new byte[cffLength];
			try {
				rf2.reOpen();
				rf2.seek(cffOffset);
				rf2.readFully(b);
			} finally {
				try {
					rf2.close();
				} catch (Exception e) {
					// empty on purpose
				}
			}
            if (subset || subsetRanges != null) {
                CFFFontSubset cff = new CFFFontSubset(new RandomAccessFileOrArray(b),longTag);
                b = cff.Process( (cff.getNames())[0] );
            }
			pobj = new StreamFont(b, "CIDFontType0C");
			obj = writer.addToBody(pobj);
			ind_font = obj.getIndirectReference();
        } else {
            byte[] b;
            if (subset || directoryOffset != 0) {
                TrueTypeFontSubSet sb = new TrueTypeFontSubSet(fileName, new RandomAccessFileOrArray(rf), longTag, directoryOffset, false, false);
                b = sb.process();
            }
            else {
                b = getFullFont();
            }
            int lengths[] = new int[]{b.length};
            pobj = new StreamFont(b, lengths);
            obj = writer.addToBody(pobj);
            ind_font = obj.getIndirectReference();
        }
        String subsetPrefix = "";
        if (subset)
            subsetPrefix = createSubsetPrefix();
        PdfDictionary dic = getFontDescriptor(ind_font, subsetPrefix);
        obj = writer.addToBody(dic);
        ind_font = obj.getIndirectReference();

        pobj = getCIDFontType2(ind_font, subsetPrefix, metrics);
        obj = writer.addToBody(pobj);
        ind_font = obj.getIndirectReference();

        pobj = getToUnicode(metrics);
        PdfIndirectReference toUnicodeRef = null;
        
        if (pobj != null) {
            obj = writer.addToBody(pobj);
            toUnicodeRef = obj.getIndirectReference();
        }

        pobj = getFontBaseType(ind_font, subsetPrefix, toUnicodeRef);
        writer.addToBody(pobj, ref);
    }

    /** A forbidden operation. Will throw a null pointer exception.
     * @param text the text
     * @return always <CODE>null</CODE>
     */    
    byte[] convertToBytes(String text)
    {
        return null;
    }

    /**
     * Checks if a character exists in this font.
     * @param c the character to check
     * @return <CODE>true</CODE> if the character has a glyph,
     * <CODE>false</CODE> otherwise
     */
    public boolean charExists(char c) {
        HashMap map = null;
        if (fontSpecific)
            map = cmap10;
        else
            map = cmap31;
        if (map == null)
            return false;
        if (fontSpecific) {
            if ((c & 0xff00) == 0 || (c & 0xff00) == 0xf000)
                return map.get(new Integer(c & 0xff)) != null;
            else
                return false;
        }
        else
            return map.get(new Integer(c)) != null;
    }
    
    /**
     * Sets the character advance.
     * @param c the character
     * @param advance the character advance normalized to 1000 units
     * @return <CODE>true</CODE> if the advance was set,
     * <CODE>false</CODE> otherwise
     */
    public boolean setCharAdvance(char c, int advance) {
        HashMap map = null;
        if (fontSpecific)
            map = cmap10;
        else
            map = cmap31;
        if (map == null)
            return false;
        int m[] = null;
        if (fontSpecific) {
            if ((c & 0xff00) == 0 || (c & 0xff00) == 0xf000)
                m = (int[])map.get(new Integer(c & 0xff));
            else
                return false;
        }
        else
            m = (int[])map.get(new Integer(c));
        if (m == null)
            return false;
        else
            m[1] = advance;
        return true;
    }
    
    public int[] getCharBBox(char c) {
        if (bboxes == null)
            return null;
        HashMap map = null;
        if (fontSpecific)
            map = cmap10;
        else
            map = cmap31;
        if (map == null)
            return null;
        int m[] = null;
        if (fontSpecific) {
            if ((c & 0xff00) == 0 || (c & 0xff00) == 0xf000)
                m = (int[])map.get(new Integer(c & 0xff));
            else
                return null;
        }
        else
            m = (int[])map.get(new Integer(c));
        if (m == null)
            return null;
        return bboxes[m[0]];
    }
}