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/fonts/CIDFontType.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: CIDFontType.java 1805622 2017-08-21 11:52:08Z ssteiner $ */

package org.apache.fop.fonts;

/**
 * This class enumerates all supported CID font types.
 */
public enum CIDFontType {

    /**
     * CID Font Type 0 (based on Type 1 format)
     */
    CIDTYPE0("CIDFontType0", 0),

    /**
     * CID Font Type 2 (based on TrueType format)
     */
    CIDTYPE2("CIDFontType2", 2);

    private final String name;
    private final int value;

    /**
     * Construct a CID font type.
     * @param name a type name
     * @param value a type value
     */
    CIDFontType(String name, int value) {
        this.name = name;
        this.value = value;
    }


    /**
     * Returns the CIDFontType by name.
     * @param name Name of the CID font type to look up
     * @return FontType the CID font type
     */
    public static CIDFontType byName(String name) {
        if (name.equalsIgnoreCase(CIDFontType.CIDTYPE0.getName())) {
            return CIDFontType.CIDTYPE0;
        } else if (name.equalsIgnoreCase(CIDFontType.CIDTYPE2.getName())) {
            return CIDFontType.CIDTYPE2;
        } else {
            throw new IllegalArgumentException("Invalid CID font type: " + name);
        }
    }


    /**
     * Returns the CID FontType by value.
     * @param value Value of the CID font type to look up
     * @return FontType the CID font type
     */
    public static CIDFontType byValue(int value) {
        if (value == CIDFontType.CIDTYPE0.getValue()) {
            return CIDFontType.CIDTYPE0;
        } else if (value == CIDFontType.CIDTYPE2.getValue()) {
            return CIDFontType.CIDTYPE2;
        } else {
            throw new IllegalArgumentException("Invalid CID font type: " + value);
        }
    }

    public String getName() {
        return name;
    }

    public int getValue() {
        return value;
    }
}

⏎ org/apache/fop/fonts/CIDFontType.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)