What Is fop.jar? I got it from the fop-2.7-bin.zip.

fop.jar in fop-2.7-bin.zip is the JAR file for FOP 2.7, which is a print formatter driven by XSL formatting objects (XSL-FO). You can obtain fop.jar from the build folder of the fop-2.7-bin.zip file.

Below is the information about the fop.jar (2.2) file:

JAR File Size and Download Location:

JAR name: fop.jar, fop-2.7.jar
Target JDK version: 1.7
File name: fop.jar
File size: 4442817 bytes
Release date: 20-Jan-2022
Download: Apache FOP Website

Java source code files for fop.jar:

⏎ org/apache/fop/pdf/PDFWArray.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

/* $Id: PDFWArray.java 1761020 2016-09-16 11:17:35Z ssteiner $ */

package org.apache.fop.pdf;

import java.util.List;

/**
 * Class representing a <b>W</b> array for CID fonts.
 */
public class PDFWArray {

    /**
     * The metrics
     */
    private List entries = new java.util.ArrayList();

    /**
     * Default constructor
     */
    public PDFWArray() {
    }

    /**
     * Convenience constructor
     * @param metrics the metrics array to initially add
     */
    public PDFWArray(int[] metrics) {
        addEntry(0, metrics);
    }

    /**
     * Add an entry for single starting CID.
     * i.e. in the form "c [w ...]"
     *
     * @param start the starting CID value.
     * @param metrics the metrics array.
     */
    public void addEntry(int start, int[] metrics) {
        entries.add(new Entry(start, metrics));
    }

    /**
     * Add an entry for a range of CIDs (/W element on p 213)
     *
     * @param first the first CID in the range
     * @param last the last CID in the range
     * @param width the width for all CIDs in the range
     */
    public void addEntry(int first, int last, int width) {
        entries.add(new int[] {
            first, last, width
        });
    }

    /**
     * Add an entry for a range of CIDs (/W2 element on p 210)
     *
     * @param first the first CID in the range
     * @param last the last CID in the range
     * @param width the width for all CIDs in the range
     * @param posX the x component for the vertical position vector
     * @param posY the y component for the vertical position vector
     */
    public void addEntry(int first, int last, int width, int posX, int posY) {
        entries.add(new int[] {
            first, last, width, posX, posY
        });
    }

    /**
     * Convert this object to PDF code.
     * @return byte[] the PDF code
     */
    public byte[] toPDF() {
        return PDFDocument.encode(toPDFString());
    }

    /**
     * Convert this object to PDF code.
     * @return String the PDF code
     */
    public String toPDFString() {
        StringBuffer p = new StringBuffer();
        p.append("[ ");
        int len = entries.size();
        for (Object entry : entries) {
            if (entry instanceof int[]) {
                int[] line = (int[]) entry;
                for (int aLine : line) {
                    p.append(aLine);
                    p.append(" ");
                }
            } else {
                ((Entry) entry).fillInPDF(p);
            }
        }
        p.append("]");
        return p.toString();
    }

    /**
     * Inner class for entries in the form "c [w ...]"
     */
    private static class Entry {
        private int start;
        private int[] metrics;
        public Entry(int s, int[] m) {
            start = s;
            metrics = m;
        }

        public void fillInPDF(StringBuffer p) {
            // p.setLength(0);
            p.append(start);
            p.append(" [");
            for (int metric : metrics) {
                p.append(metric);
                p.append(" ");
            }
            p.append("] ");
        }

    }
}

⏎ org/apache/fop/pdf/PDFWArray.java

Or download all of them as a single archive file:

File name: fop-2.7-src.zip
File size: 3401312 bytes
Release date: 2022-01-20
Download 

⇒ "fop" Command in fop-2.7-bin.zip

⇐ What Is fop-2.7-bin.zip

⇑ Download and Installing of FOP 2.x

⇑⇑ FAQ for FOP (Formatting Object Processor)