type1font.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

        }
        else
            throw new DocumentException(afmFile + " is not an AFM or PFM font file.");

        EncodingScheme = EncodingScheme.trim();
        if (EncodingScheme.equals("AdobeStandardEncoding") || EncodingScheme.equals("StandardEncoding")) {
            fontSpecific = false;
        }
        if (!encoding.startsWith("#"))
            PdfEncodings.convertToBytes(" ", enc); // check if the encoding exists
        createEncoding();
    }
    
/** Gets the width from the font according to the <CODE>name</CODE> or,
 * if the <CODE>name</CODE> is null, meaning it is a symbolic font,
 * the char <CODE>c</CODE>.
 * @param c the char if the font is symbolic
 * @param name the glyph name
 * @return the width of the char
 */
    int getRawWidth(int c, String name) {
        Object metrics[];
        if (name == null) { // font specific
            metrics = (Object[])CharMetrics.get(new Integer(c));
        }
        else {
            if (name.equals(".notdef"))
                return 0;
            metrics = (Object[])CharMetrics.get(name);
        }
        if (metrics != null)
            return ((Integer)(metrics[1])).intValue();
        return 0;
    }
    
/** Gets the kerning between two Unicode characters. The characters
 * are converted to names and this names are used to find the kerning
 * pairs in the <CODE>HashMap</CODE> <CODE>KernPairs</CODE>.
 * @param char1 the first char
 * @param char2 the second char
 * @return the kerning to be applied
 */
    public int getKerning(char char1, char char2)
    {
        String first = GlyphList.unicodeToName((int)char1);
        if (first == null)
            return 0;
        String second = GlyphList.unicodeToName((int)char2);
        if (second == null)
            return 0;
        Object obj[] = (Object[])KernPairs.get(first);
        if (obj == null)
            return 0;
        for (int k = 0; k < obj.length; k += 2) {
            if (second.equals(obj[k]))
                return ((Integer)obj[k + 1]).intValue();
        }
        return 0;
    }
    
    
    /** Reads the font metrics
     * @param rf the AFM file
     * @throws DocumentException the AFM file is invalid
     * @throws IOException the AFM file could not be read
     */
    public void process(RandomAccessFileOrArray rf) throws DocumentException, IOException
    {
        String line;
        boolean isMetrics = false;
        while ((line = rf.readLine()) != null)
        {
            StringTokenizer tok = new StringTokenizer(line, " ,\n\r\t\f");
            if (!tok.hasMoreTokens())
                continue;
            String ident = tok.nextToken();
            if (ident.equals("FontName"))
                FontName = tok.nextToken("\u00ff").substring(1);
            else if (ident.equals("FullName"))
                FullName = tok.nextToken("\u00ff").substring(1);
            else if (ident.equals("FamilyName"))
                FamilyName = tok.nextToken("\u00ff").substring(1);
            else if (ident.equals("Weight"))
                Weight = tok.nextToken("\u00ff").substring(1);
            else if (ident.equals("ItalicAngle"))
                ItalicAngle = Float.parseFloat(tok.nextToken());
            else if (ident.equals("IsFixedPitch"))
                IsFixedPitch = tok.nextToken().equals("true");
            else if (ident.equals("CharacterSet"))
                CharacterSet = tok.nextToken("\u00ff").substring(1);
            else if (ident.equals("FontBBox"))
            {
                llx = (int)Float.parseFloat(tok.nextToken());
                lly = (int)Float.parseFloat(tok.nextToken());
                urx = (int)Float.parseFloat(tok.nextToken());
                ury = (int)Float.parseFloat(tok.nextToken());
            }
            else if (ident.equals("UnderlinePosition"))
                UnderlinePosition = (int)Float.parseFloat(tok.nextToken());
            else if (ident.equals("UnderlineThickness"))
                UnderlineThickness = (int)Float.parseFloat(tok.nextToken());
            else if (ident.equals("EncodingScheme"))
                EncodingScheme = tok.nextToken("\u00ff").substring(1);
            else if (ident.equals("CapHeight"))
                CapHeight = (int)Float.parseFloat(tok.nextToken());
            else if (ident.equals("XHeight"))
                XHeight = (int)Float.parseFloat(tok.nextToken());
            else if (ident.equals("Ascender"))
                Ascender = (int)Float.parseFloat(tok.nextToken());
            else if (ident.equals("Descender"))
                Descender = (int)Float.parseFloat(tok.nextToken());
            else if (ident.equals("StdHW"))
                StdHW = (int)Float.parseFloat(tok.nextToken());
            else if (ident.equals("StdVW"))
                StdVW = (int)Float.parseFloat(tok.nextToken());
            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 = "";
            int B[] = null;

            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 = new Integer((int)Float.parseFloat(tokc.nextToken()));
                else if (ident.equals("N"))
                    N = tokc.nextToken();
                else if (ident.equals("B")) {
                    B = new int[]{Integer.parseInt(tokc.nextToken()), 
                                         Integer.parseInt(tokc.nextToken()),
                                         Integer.parseInt(tokc.nextToken()),
                                         Integer.parseInt(tokc.nextToken())};
                }
            }
            Object metrics[] = new Object[]{C, WX, N, B};
            if (C.intValue() >= 0)
                CharMetrics.put(C, metrics);
            CharMetrics.put(N, metrics);
        }
        if (isMetrics)
            throw new DocumentException("Missing EndCharMetrics in " + fileName);
        if (!CharMetrics.containsKey("nonbreakingspace")) {
            Object[] space = (Object[])CharMetrics.get("space");
            if (space != null)
                CharMetrics.put("nonbreakingspace", space);
        }
        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.parseFloat(tok.nextToken()));
                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() != PFB_TYPES[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);
        }
        finally {
            if (rf != null) {
                try {
                    rf.close();