io.jar is a component in iText Java library to provide input/output functionalities. iText Java library allows you to generate and manage PDF documents.

The Source Code files are provided together with the JAR file in the binary packge like iText7-Core-7.1.4.zip. You can download it at iText 7 Core Download site.

You can compile it to generate your JAR file, using io.pom as the build configuration file.

The source code of io-7.1.4.jar is provided below:

⏎ com/itextpdf/io/font/woff2/Woff2MemoryOut.java

// Copyright 2016 Google Inc. All Rights Reserved.
//
// Licensed 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.
//
// This is part of java port of project hosted at https://github.com/google/woff2
package com.itextpdf.io.font.woff2;

/**
 * Fixed memory block for woff2 out.
 */
class Woff2MemoryOut implements Woff2Out {
    private byte[] buf_;
    private int buf_size_;
    private int offset_;

    public Woff2MemoryOut(byte[] buf_, int buf_size_) {
        this.buf_ = buf_;
        this.buf_size_ = buf_size_;
        this.offset_ = 0;
    }

    @Override
    public void write(byte[] buf, int buff_offset, int n) {
        write(buf, buff_offset, offset_, n);
    }

    @Override
    public void write(byte[] buf, int buff_offset, int offset, int n) {
        if (offset > buf_size_ || n > buf_size_ - offset) {
            throw new FontCompressionException(FontCompressionException.WRITE_FAILED);
        }
        System.arraycopy(buf, buff_offset, buf_, offset, n);
        offset_ = Math.max(offset_, offset + n);
    }

    @Override
    public int size() {
        return offset_;
    }
}

⏎ com/itextpdf/io/font/woff2/Woff2MemoryOut.java

Or download all of them as a single archive file:

File name: io-7.1.4-sources.jar
File size: 608762 bytes
Release date: 2018-10-09
Download 

⇒ iText layout.jar Source Code

⇐ iText kernel.jar Source Code

⇑ Download and Install iText Java Library

⇑⇑ iText for PDF Generation