type1font.java

一个java操作pdf文件的开发包,很好用的.

            else if (ident.equals("XHeight"))
                XHeight = (int)Float.valueOf(tok.nextToken()).floatValue();
            else if (ident.equals("Ascender"))
                Ascender = (int)Float.valueOf(tok.nextToken()).floatValue();
            else if (ident.equals("Descender"))
                Descender = (int)Float.valueOf(tok.nextToken()).floatValue();
            else if (ident.equals("StdHW"))
                StdHW = (int)Float.valueOf(tok.nextToken()).floatValue();
            else if (ident.equals("StdVW"))
                StdVW = (int)Float.valueOf(tok.nextToken()).floatValue();
            else if (ident.equals("StartCharMetrics"))
            {
                isMetrics = true;
                break;
            }
        }
        if (!isMetrics)
            throw new DocumentException("Missing StartCharMetrics in " + fileName);
        while ((line = rf.readLine()) != null)
        {
            StringTokenizer tok = new StringTokenizer(line);
            if (!tok.hasMoreTokens())
                continue;
            String ident = tok.nextToken();
            if (ident.equals("EndCharMetrics"))
            {
                isMetrics = false;
                break;
            }
            Integer C = new Integer(-1);
            Integer WX = new Integer(250);
            String N = "";
            tok = new StringTokenizer(line, ";");
            while (tok.hasMoreTokens())
            {
                StringTokenizer tokc = new StringTokenizer(tok.nextToken());
                if (!tokc.hasMoreTokens())
                    continue;
                ident = tokc.nextToken();
                if (ident.equals("C"))
                    C = Integer.valueOf(tokc.nextToken());
                else if (ident.equals("WX"))
                    WX = Integer.valueOf(tokc.nextToken());
                else if (ident.equals("N"))
                    N = tokc.nextToken();
            }
            CharMetrics.add(new Object[]{C, WX, N});
        }
        if (isMetrics)
            throw new DocumentException("Missing EndCharMetrics in " + fileName);
        while ((line = rf.readLine()) != null)
        {
            StringTokenizer tok = new StringTokenizer(line);
            if (!tok.hasMoreTokens())
                continue;
            String ident = tok.nextToken();
            if (ident.equals("EndFontMetrics"))
                return;
            if (ident.equals("StartKernPairs"))
            {
                isMetrics = true;
                break;
            }
        }
        if (!isMetrics)
            throw new DocumentException("Missing EndFontMetrics in " + fileName);
        while ((line = rf.readLine()) != null)
        {
            StringTokenizer tok = new StringTokenizer(line);
            if (!tok.hasMoreTokens())
                continue;
            String ident = tok.nextToken();
            if (ident.equals("KPX"))
            {
                String first = tok.nextToken();
                String second = tok.nextToken();
                Integer width = new Integer((int)Float.valueOf(tok.nextToken()).floatValue());
                Object relates[] = (Object[])KernPairs.get(first);
                if (relates == null)
                    KernPairs.put(first, new Object[]{second, width});
                else
                {
                    int n = relates.length;
                    Object relates2[] = new Object[n + 2];
                    System.arraycopy(relates, 0, relates2, 0, n);
                    relates2[n] = second;
                    relates2[n + 1] = width;
                    KernPairs.put(first, relates2);
                }
            }
            else if (ident.equals("EndKernPairs"))
            {
                isMetrics = false;
                break;
            }
        }
        if (isMetrics)
            throw new DocumentException("Missing EndKernPairs in " + fileName);
        rf.close();
    }
    
/** If the embedded flag is <CODE>false</CODE> or if the font is
 *  one of the 14 built in types, it returns <CODE>null</CODE>,
 * otherwise the font is read and output in a PdfStream object.
 * @return the PdfStream containing the font or <CODE>null</CODE>
 * @throws DocumentException if there is an error reading the font
 */
    private PdfStream getFontStream() throws DocumentException
    {
        if (builtinFont || !embedded)
            return null;
        RandomAccessFileOrArray rf = null;
        try {
            String filePfb = fileName.substring(0, fileName.length() - 3) + "pfb";
            if (pfb == null)
                rf = new RandomAccessFileOrArray(filePfb);
            else
                rf = new RandomAccessFileOrArray(pfb);
            int fileLength = rf.length();
            byte st[] = new byte[fileLength - 18];
            int lengths[] = new int[3];
            int bytePtr = 0;
            for (int k = 0; k < 3; ++k) {
                if (rf.read() != 0x80)
                    throw new DocumentException("Start marker missing in " + filePfb);
                if (rf.read() != pfbTypes[k])
                    throw new DocumentException("Incorrect segment type in " + filePfb);
                int size = rf.read();
                size += rf.read() << 8;
                size += rf.read() << 16;
                size += rf.read() << 24;
                lengths[k] = size;
                while (size != 0) {
                    int got = rf.read(st, bytePtr, size);
                    if (got < 0)
                        throw new DocumentException("Premature end in " + filePfb);
                    bytePtr += got;
                    size -= got;
                }
            }
            return new StreamFont(st, lengths);
        }
        catch (Exception e) {
            throw new DocumentException(e.getMessage());
        }
        finally {
            if (rf != null) {
                try {
                    rf.close();
                }
                catch (Exception e) {
                    // empty on purpose
                }
            }
        }
    }
    
/** Generates the font descriptor for this font or <CODE>null</CODE> if it is
 * one of the 14 built in fonts.
 * @param fontStream the indirect reference to a PdfStream containing the font or <CODE>null</CODE>
 * @return the PdfDictionary containing the font descriptor or <CODE>null</CODE>
 */
    private PdfDictionary getFontDescriptor(PdfIndirectReference fontStream)
    {
        if (builtinFont)
            return null;
        PdfDictionary dic = new PdfDictionary(new PdfName("FontDescriptor"));
        dic.put(new PdfName("Ascent"), new PdfNumber(Ascender));
        dic.put(new PdfName("CapHeight"), new PdfNumber(CapHeight));
        dic.put(new PdfName("Descent"), new PdfNumber(Descender));
        dic.put(new PdfName("FontBBox"), new PdfRectangle(llx, lly, urx, ury));
        dic.put(new PdfName("FontName"), new PdfName(FontName));
        dic.put(new PdfName("ItalicAngle"), new PdfNumber(ItalicAngle));
        dic.put(new PdfName("StemV"), new PdfNumber(StdVW));
        if (fontStream != null)
            dic.put(new PdfName("FontFile"), fontStream);
        int flags = 0;
        if (IsFixedPitch)
            flags |= 1;
        flags |= fontSpecific ? 4 : 32;
        if (ItalicAngle < 0)
            flags |= 64;
        if (FontName.indexOf("Caps") >= 0 || FontName.endsWith("SC"))
            flags |= 131072;
        if (Weight.equals("Bold"))
            flags |= 262144;
        dic.put(new PdfName("Flags"), new PdfNumber(flags));
        
        return dic;
    }
    
    /** Generates the font dictionary for this font.
     * @return the PdfDictionary containing the font dictionary
     * @param firstChar the first valid character
     * @param lastChar the last valid character
     * @param shortTag a 256 bytes long <CODE>byte</CODE> array where each unused byte is represented by 0
     * @param fontDescriptor the indirect reference to a PdfDictionary containing the font descriptor or <CODE>null</CODE>
     */
    private PdfDictionary getFontBaseType(PdfIndirectReference fontDescriptor, int firstChar, int lastChar, byte shortTag[])
    {
        PdfDictionary dic = new PdfDictionary(PdfName.FONT);
        dic.put(PdfName.SUBTYPE, PdfName.TYPE1);
        dic.put(PdfName.BASEFONT, new PdfName(FontName));
        boolean stdEncoding = encoding.equals("Cp1252") || encoding.equals("MacRoman");
        if (!fontSpecific) {
            for (int k = firstChar; k <= lastChar; ++k) {
                if (!differences[k].equals(notdef)) {
                    firstChar = k;
                    break;
                }
            }
            if (stdEncoding)
                dic.put(PdfName.ENCODING, encoding.equals("Cp1252") ? PdfName.WIN_ANSI_ENCODING : PdfName.MAC_ROMAN_ENCODING);
            else {
                PdfDictionary enc = new PdfDictionary(new PdfName("Encoding"));
                PdfArray dif = new PdfArray();
                boolean gap = true;                
                for (int k = firstChar; k <= lastChar; ++k) {
                    if (shortTag[k] != 0) {
                        if (gap) {
                            dif.add(new PdfNumber(k));
                            gap = false;
                        }
                        dif.add(new PdfName(differences[k]));
                    }
                    else
                        gap = true;
                }
                enc.put(new PdfName("Differences"), dif);
                dic.put(PdfName.ENCODING, enc);
            }
        }
        if (forceWidthsOutput || !(builtinFont && (fontSpecific || stdEncoding))) {
            dic.put(new PdfName("FirstChar"), new PdfNumber(firstChar));
            dic.put(new PdfName("LastChar"), new PdfNumber(lastChar));
            PdfArray wd = new PdfArray();
            for (int k = firstChar; k <= lastChar; ++k) {
                if (shortTag[k] == 0)
                    wd.add(new PdfNumber(0));
                else
                    wd.add(new PdfNumber(widths[k]));
            }
            dic.put(new PdfName("Widths"), wd);
        }
        if (!builtinFont && fontDescriptor != null)
            dic.put(new PdfName("FontDescriptor"), fontDescriptor);
        return dic;
    }
    
    /** 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 {
        int firstChar = ((Integer)params[0]).intValue();
        int lastChar = ((Integer)params[1]).intValue();
        byte shortTag[] = (byte[])params[2];
        if (!subset) {
            firstChar = 0;
            lastChar = shortTag.length - 1;
            for (int k = 0; k < shortTag.length; ++k)
                shortTag[k] = 1;
        }
        PdfIndirectReference ind_font = null;
        PdfObject pobj = null;
        PdfIndirectObject obj = null;
        pobj = getFontStream();
        if (pobj != null){
            obj = writer.addToBody(pobj);
            ind_font = obj.getIndirectReference();
        }
        pobj = getFontDescriptor(ind_font);
        if (pobj != null){
            obj = writer.addToBody(pobj);
            ind_font = obj.getIndirectReference();
        }
        pobj = getFontBaseType(ind_font, firstChar, lastChar, shortTag);
        writer.addToBody(pobj, ref);
    }
    
    /** Gets the font parameter identified by <CODE>key</CODE>. Valid values
     * for <CODE>key</CODE> are <CODE>ASCENT</CODE>, <CODE>CAPHEIGHT</CODE>, <CODE>DESCENT</CODE>,
     * <CODE>ITALICANGLE</CODE>, <CODE>BBOXLLX</CODE>, <CODE>BBOXLLY</CODE>, <CODE>BBOXURX</CODE>
     * and <CODE>BBOXURY</CODE>.
     * @param key the parameter to be extracted
     * @param fontSize the font size in points
     * @return the parameter in points
     */    
    public float getFontDescriptor(int key, float fontSize) {
        switch (key) {
            case AWT_ASCENT:
            case ASCENT:
                return Ascender * fontSize / 1000;
            case CAPHEIGHT:
                return CapHeight * fontSize / 1000;
            case AWT_DESCENT:
            case DESCENT:
                return Descender * fontSize / 1000;
            case ITALICANGLE:
                return ItalicAngle;
            case BBOXLLX:
                return llx * fontSize / 1000;
            case BBOXLLY:
                return lly * fontSize / 1000;
            case BBOXURX:
                return urx * fontSize / 1000;
            case BBOXURY:
                return ury * fontSize / 1000;
            case AWT_LEADING:
                return 0;
            case AWT_MAXADVANCE:
                return (urx - llx) * fontSize / 1000;
        }
        return 0;
    }
    
    /** Gets the postscript font name.
     * @return the postscript font name
     */
    public String getPostscriptFontName() {
        return FontName;
    }
    
    /** Gets the full name of the font. If it is a True Type font
     * each array element will have {Platform ID, Platform Encoding ID,
     * Language ID, font name}. The interpretation of this values can be
     * found in the Open Type specification, chapter 2, in the 'name' table.<br>
     * For the other fonts the array has a single element with {"", "", "",
     * font name}.
     * @return the full name of the font
     */
    public String[][] getFullFontName() {
        return new String[][]{{"", "", "", FullName}};
    }
    
    /** Gets the family name of the font. If it is a True Type font
     * each array element will have {Platform ID, Platform Encoding ID,
     * Language ID, font name}. The interpretation of this values can be
     * found in the Open Type specification, chapter 2, in the 'name' table.<br>
     * For the other fonts the array has a single element with {"", "", "",
     * font name}.
     * @return the family name of the font
     */
    public String[][] getFamilyFontName() {
        return new String[][]{{"", "", "", FamilyName}};
    }
    
    /** Checks if the font has any kerning pairs.
     * @return <CODE>true</CODE> if the font has any kerning pairs
     */    
    public boolean hasKernPairs() {
        return KernPairs.size() > 0;
    }
    
}