cfffont.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

            IndexBaseItem privateBase = new IndexBaseItem();
            l.addLast(privateBase);
            
            // looking at the PS that acrobat generates from a PDF with
            // a CFF opentype font embeded with an identity-H encoding,
            // it seems that it does not need a FontName.
            //l.addLast(new DictNumberItem((standardStrings.length+(stringOffsets.length-1)+2)));
            //l.addLast(new UInt8Item((char)12));
            //l.addLast(new UInt8Item((char)38)); // FontName
            
            l.addLast(new DictNumberItem(fonts[j].privateLength));
            OffsetItem privateRef = new DictOffsetItem();
            l.addLast(privateRef);
            l.addLast(new UInt8Item((char)18)); // Private
            
            l.addLast(new IndexMarkerItem(privateIndex1Ref,privateBase));
            
            // copy the private index & local subroutines
            
            l.addLast(new MarkerItem(privateRef));
            // copy the private dict and the local subroutines.
            // the length of the private dict seems to NOT include
            // the local subroutines.
            l.addLast(new RangeItem(buf,fonts[j].privateOffset,fonts[j].privateLength));
            if (fonts[j].privateSubrs >= 0) {
                //System.err.println("has subrs="+fonts[j].privateSubrs+" ,len="+fonts[j].privateLength);
                l.addLast(getEntireIndexRange(fonts[j].privateSubrs));
            }
        }
        
        // copy the charstring index
        
        l.addLast(new MarkerItem(charstringsRef));
        l.addLast(getEntireIndexRange(fonts[j].charstringsOffset));
        
        // now create the new CFF font
        
        int[] currentOffset = new int[1];
        currentOffset[0] = 0;
        
        Iterator listIter = l.iterator();
        while ( listIter.hasNext() ) {
            Item item = (Item) listIter.next();
            item.increment(currentOffset);
        }
        
        listIter = l.iterator();
        while ( listIter.hasNext() ) {
            Item item = (Item) listIter.next();
            item.xref();
        }
        
        int size = currentOffset[0];
        byte[] b = new byte[size];
        
        listIter = l.iterator();
        while ( listIter.hasNext() ) {
            Item item = (Item) listIter.next();
            item.emit(b);
        }
        
        return b;
    }
    
    
    public boolean isCID(String fontName) {
        int j;
        for (j=0; j<fonts.length; j++)
            if (fontName.equals(fonts[j].name)) return fonts[j].isCID;
        return false;
    }
    
    public boolean exists(String fontName) {
        int j;
        for (j=0; j<fonts.length; j++)
            if (fontName.equals(fonts[j].name)) return true;
        return false;
    }
    
    
    public String[] getNames() {
        String[] names = new String[ fonts.length ];
        for (int i=0; i<fonts.length; i++)
            names[i] = fonts[i].name;
        return names;
    }
    /**
     * A random Access File or an array
     */
    protected RandomAccessFileOrArray buf;
    private int offSize;
    
    protected int nameIndexOffset;
    protected int topdictIndexOffset;
    protected int stringIndexOffset;
    protected int gsubrIndexOffset;
    protected int[] nameOffsets;
    protected int[] topdictOffsets;
    protected int[] stringOffsets;
    protected int[] gsubrOffsets;
    
    /**
     * TODO Changed from private to protected by Ygal&Oren
     */
    protected final class Font {
        public String    name;
        public String    fullName;
        public boolean   isCID = false;
        public int       privateOffset     = -1; // only if not CID
        public int       privateLength     = -1; // only if not CID
        public int       privateSubrs      = -1;
        public int       charstringsOffset = -1;
        public int       encodingOffset    = -1;
        public int       charsetOffset     = -1;
        public int       fdarrayOffset     = -1; // only if CID
        public int       fdselectOffset    = -1; // only if CID
        public int[]     fdprivateOffsets;
        public int[]     fdprivateLengths;
        public int[]     fdprivateSubrs;
        
        // Added by Oren & Ygal
        public int nglyphs;
        public int nstrings;
        public int CharsetLength;
        public int[]    charstringsOffsets;
        public int[]    charset;
        public int[] 	FDSelect;
        public int FDSelectLength;
        public int FDSelectFormat;
        public int 		CharstringType = 2;
        public int FDArrayCount;
        public int FDArrayOffsize;
        public int[] FDArrayOffsets;
        public int[] PrivateSubrsOffset;
        public int[][] PrivateSubrsOffsetsArray;
        public int[]       SubrsOffsets;
    }
    // Changed from private to protected by Ygal&Oren
    protected Font[] fonts;
    
    public CFFFont(RandomAccessFileOrArray inputbuffer) {
        
        //System.err.println("CFF: nStdString = "+standardStrings.length);
        buf = inputbuffer;
        seek(0);
        
        int major, minor;
        major = getCard8();
        minor = getCard8();
        
        //System.err.println("CFF Major-Minor = "+major+"-"+minor);
        
        int hdrSize = getCard8();
        
        offSize = getCard8();
        
        //System.err.println("offSize = "+offSize);
        
        //int count, indexOffSize, indexOffset, nextOffset;
        
        nameIndexOffset    = hdrSize;
        nameOffsets        = getIndex(nameIndexOffset);
        topdictIndexOffset = nameOffsets[nameOffsets.length-1];
        topdictOffsets     = getIndex(topdictIndexOffset);
        stringIndexOffset  = topdictOffsets[topdictOffsets.length-1];
        stringOffsets      = getIndex(stringIndexOffset);
        gsubrIndexOffset   = stringOffsets[stringOffsets.length-1];
        gsubrOffsets       = getIndex(gsubrIndexOffset);
        
        fonts = new Font[nameOffsets.length-1];
        
        // now get the name index
        
        /*
        names             = new String[nfonts];
        privateOffset     = new int[nfonts];
        charsetOffset     = new int[nfonts];
        encodingOffset    = new int[nfonts];
        charstringsOffset = new int[nfonts];
        fdarrayOffset     = new int[nfonts];
        fdselectOffset    = new int[nfonts];
         */
        
        for (int j=0; j<nameOffsets.length-1; j++) {
            fonts[j] = new Font();
            seek(nameOffsets[j]);
            fonts[j].name = "";
            for (int k=nameOffsets[j]; k<nameOffsets[j+1]; k++) {
                fonts[j].name += (char)getCard8();
            }
            //System.err.println("name["+j+"]=<"+fonts[j].name+">");
        }
        
        // string index
        
        //strings = new String[stringOffsets.length-1];
        /*
        System.err.println("std strings = "+standardStrings.length);
        System.err.println("fnt strings = "+(stringOffsets.length-1));
        for (char j=0; j<standardStrings.length+(stringOffsets.length-1); j++) {
            //seek(stringOffsets[j]);
            //strings[j] = "";
            //for (int k=stringOffsets[j]; k<stringOffsets[j+1]; k++) {
            //	strings[j] += (char)getCard8();
            //}
            System.err.println("j="+(int)j+" <? "+(standardStrings.length+(stringOffsets.length-1)));
            System.err.println("strings["+(int)j+"]=<"+getString(j)+">");
        }
         */
        
        // top dict
        
        for (int j=0; j<topdictOffsets.length-1; j++) {
            seek(topdictOffsets[j]);
            while (getPosition() < topdictOffsets[j+1]) {            	
                getDictItem();
                if (key=="FullName") {
                    //System.err.println("getting fullname sid = "+((Integer)args[0]).intValue());
                    fonts[j].fullName = getString((char)((Integer)args[0]).intValue());
                    //System.err.println("got it");
                } else if (key=="ROS")
                    fonts[j].isCID = true;
                else if (key=="Private") {
                    fonts[j].privateLength  = ((Integer)args[0]).intValue();
                    fonts[j].privateOffset  = ((Integer)args[1]).intValue();
                }
                else if (key=="charset"){
                    fonts[j].charsetOffset = ((Integer)args[0]).intValue();
                    
                }
                else if (key=="Encoding"){
                    fonts[j].encodingOffset = ((Integer)args[0]).intValue();
                    ReadEncoding(fonts[j].encodingOffset);
                }
                else if (key=="CharStrings") {
                    fonts[j].charstringsOffset = ((Integer)args[0]).intValue();
                    //System.err.println("charstrings "+fonts[j].charstringsOffset);
                    // Added by Oren & Ygal
                    int p = getPosition();
                    fonts[j].charstringsOffsets = getIndex(fonts[j].charstringsOffset);
                    seek(p);
                } else if (key=="FDArray")
                    fonts[j].fdarrayOffset = ((Integer)args[0]).intValue();
                else if (key=="FDSelect")
                    fonts[j].fdselectOffset = ((Integer)args[0]).intValue();
                else if (key=="CharstringType")
                	fonts[j].CharstringType = ((Integer)args[0]).intValue();
            }
            
            // private dict
            if (fonts[j].privateOffset >= 0) {
                //System.err.println("PRIVATE::");
                seek(fonts[j].privateOffset);
                while (getPosition() < fonts[j].privateOffset+fonts[j].privateLength) {
                    getDictItem();
                    if (key=="Subrs")
                    	//Add the private offset to the lsubrs since the offset is 
                    	// relative to the begining of the PrivateDict
                        fonts[j].privateSubrs = ((Integer)args[0]).intValue()+fonts[j].privateOffset;
                }
            }
            
            // fdarray index
            if (fonts[j].fdarrayOffset >= 0) {
                int[] fdarrayOffsets = getIndex(fonts[j].fdarrayOffset);
                
                fonts[j].fdprivateOffsets = new int[fdarrayOffsets.length-1];
                fonts[j].fdprivateLengths = new int[fdarrayOffsets.length-1];
                
                //System.err.println("FD Font::");
                
                for (int k=0; k<fdarrayOffsets.length-1; k++) {
                    seek(fdarrayOffsets[k]);
                    while (getPosition() < fdarrayOffsets[k+1])
                        getDictItem();
                    if (key=="Private") {
                        fonts[j].fdprivateLengths[k]  = ((Integer)args[0]).intValue();
                        fonts[j].fdprivateOffsets[k]  = ((Integer)args[1]).intValue();
                    }
                    
                }
            }
        }
        //System.err.println("CFF: done");
    }
    
    // ADDED BY Oren & Ygal
    
    void ReadEncoding(int nextIndexOffset){
    	int format;
    	seek(nextIndexOffset);
    	format = getCard8();
    }    
}