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/cli/ImageInputHandler.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: ImageInputHandler.java 1616590 2014-08-07 20:27:59Z gadams $ */

package org.apache.fop.cli;

import java.io.File;
import java.io.StringReader;
import java.util.Vector;

import javax.xml.transform.Source;
import javax.xml.transform.stream.StreamSource;

/**
 * InputHandler for the images (for example TIFF) as input.
 */
public class ImageInputHandler extends InputHandler {

    /**
     * Main constructor.
     * @param imagefile the image file
     * @param xsltfile XSLT file (may be null in which case the default stylesheet is used)
     * @param params Vector of command-line parameters (name, value,
     *      name, value, ...) for XSL stylesheet, null if none
     */
    public ImageInputHandler(File imagefile, File xsltfile, Vector params) {
        super(imagefile, xsltfile, params);
    }

    /** {@inheritDoc} */
    protected Source createMainSource() {
        return new StreamSource(new StringReader(
                "<image>" + this.sourcefile.toURI().toASCIIString() + "</image>"));
    }

    /** {@inheritDoc} */
    protected Source createXSLTSource() {
        Source src = super.createXSLTSource();
        if (src == null) {
            src = new StreamSource(ImageInputHandler.class.getResource("image2fo.xsl").toExternalForm());
        }
        return src;
    }

}

⏎ org/apache/fop/cli/ImageInputHandler.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)