DctDecodeFilter.java

/*
    This file is part of the iText (R) project.
    Copyright (c) 1998-2025 Apryse Group NV
    Authors: Apryse Software.

    This program is offered under a commercial and under the AGPL license.
    For commercial licensing, contact us at https://itextpdf.com/sales.  For AGPL licensing, see below.

    AGPL licensing:
    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU Affero General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Affero General Public License for more details.

    You should have received a copy of the GNU Affero General Public License
    along with this program.  If not, see <https://www.gnu.org/licenses/>.
 */
package com.itextpdf.kernel.pdf.filters;

import com.itextpdf.kernel.logs.KernelLogMessageConstant;
import com.itextpdf.kernel.pdf.PdfDictionary;
import com.itextpdf.kernel.pdf.PdfName;
import com.itextpdf.kernel.pdf.PdfObject;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * Handles a DCTDecode filter. For now no modification applies and the data would be return as is
 * (in JPEG baseline format).
 */
public class DctDecodeFilter implements IFilterHandler {

    private static final Logger LOGGER = LoggerFactory.getLogger(DctDecodeFilter.class);

    @Override
    public byte[] decode(byte[] b, PdfName filterName, PdfObject decodeParams, PdfDictionary streamDictionary) {
        LOGGER.info(KernelLogMessageConstant.DCTDECODE_FILTER_DECODING);
        return b;
    }
}