com.lowagie.text.pdf.UnembedFontPdfSmartCopy Maven / Gradle / Ivy

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package com.lowagie.text.pdf;

import java.io.IOException;
import java.io.OutputStream;
import java.util.Iterator;

import com.lowagie.text.Document;
import com.lowagie.text.DocumentException;

/**
 * Makes a copy of a PDF, unembedding all embedded fonts. All font headers and descriptors are preserved and only the font file
 * is removed.
 */
public class UnembedFontPdfSmartCopy extends PdfSmartCopy {

    public UnembedFontPdfSmartCopy(Document document, OutputStream os)
            throws DocumentException {
        super(document, os);
    }

    protected PdfDictionary copyDictionary(PdfDictionary in)
            throws IOException, BadPdfFormatException {

        PdfDictionary out = new PdfDictionary();
        PdfReader.getPdfObjectRelease(in.get(PdfName.TYPE));

        for (Iterator it = in.getKeys().iterator(); it.hasNext();) {
            PdfName key = (PdfName) it.next();
            PdfObject value = in.get(key);

            if ((PdfName.FONTFILE.equals(key)
                    || PdfName.FONTFILE2.equals(key)
                    || PdfName.FONTFILE3.equals(key))
                    && !isFontSubset(PdfReader.getFontNameFromDescriptor(in))) {
                continue;
            } else {
                out.put(key, copyObject(value));
            }
        }

        return out;
    }

    private static boolean isFontSubset(String fontName) {
        return fontName != null && fontName.length() >= 8 && fontName.charAt(6) == '+';
    }
}