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File Content: `PelExif.php`

<?php

/**
 * PEL: PHP Exif Library.
 * A library with support for reading and
 * writing all Exif headers in JPEG and TIFF images using PHP.
 *
 * Copyright (C) 2004, 2005 Martin Geisler.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program in the file COPYING; if not, write to the
 * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
 * Boston, MA 02110-1301 USA
 */

/**
 * Class representing Exif data.
 *
 * Exif data resides as {@link PelJpegContent data} and consists of a
 * header followed by a number of {@link PelJpegIfd IFDs}.
 *
 * The interesting method in this class is {@link getTiff()} which
 * will return the {@link PelTiff} object which really holds the data
 * which one normally think of when talking about Exif data. This is
 * because Exif data is stored as an extension of the TIFF file
 * format.
 *
 * @author Martin Geisler <mgeisler@users.sourceforge.net>
 * @package PEL
 */
namespace lsolesen\pel;

class PelExif extends PelJpegContent
{

    /**
     * Exif header.
     *
     * The Exif data must start with these six bytes to be considered
     * valid.
     */
    const EXIF_HEADER = "Exif\0\0";

    /**
     * The PelTiff object contained within.
     *
     * @var PelTiff
     */
    private $tiff = null;

    /**
     * Construct a new Exif object.
     *
     * The new object will be empty --- use the {@link load()} method to
     * load Exif data from a {@link PelDataWindow} object, or use the
     * {@link setTiff()} to change the {@link PelTiff} object, which is
     * the true holder of the Exif {@link PelEntry entries}.
     */
    public function __construct()
    {
        // nothing to be done
    }

    /**
     * Load and parse Exif data.
     *
     * This will populate the object with Exif data, contained as a
     * {@link PelTiff} object. This TIFF object can be accessed with
     * the {@link getTiff()} method.
     *
     * @param PelDataWindow $d
     */
    public function load(PelDataWindow $d)
    {
        Pel::debug('Parsing %d bytes of Exif data...', $d->getSize());

        /* There must be at least 6 bytes for the Exif header. */
        if ($d->getSize() < 6) {
            throw new PelInvalidDataException('Expected at least 6 bytes of Exif ' . 'data, found just %d bytes.', $d->getSize());
        }
        /* Verify the Exif header */
        if ($d->strcmp(0, self::EXIF_HEADER)) {
            $d->setWindowStart(strlen(self::EXIF_HEADER));
        } else {
            throw new PelInvalidDataException('Exif header not found.');
        }

        /* The rest of the data is TIFF data. */
        $this->tiff = new PelTiff();
        $this->tiff->load($d);
    }

    /**
     * Change the TIFF information.
     *
     * Exif data is really stored as TIFF data, and this method can be
     * used to change this data from one {@link PelTiff} object to
     * another.
     *
     * @param PelTiff $tiff
     *            the new TIFF object.
     */
    public function setTiff(PelTiff $tiff)
    {
        $this->tiff = $tiff;
    }

    /**
     * Get the underlying TIFF object.
     *
     * The actual Exif data is stored in a {@link PelTiff} object, and
     * this method provides access to it.
     *
     * @return PelTiff|null the TIFF object with the Exif data.
     */
    public function getTiff()
    {
        return $this->tiff;
    }

    /**
     * Produce bytes for the Exif data.
     *
     * @return string bytes representing this object.
     */
    public function getBytes()
    {
        return self::EXIF_HEADER . $this->tiff->getBytes();
    }

    /**
     * Return a string representation of this object.
     *
     * @return string a string describing this object. This is mostly
     *         useful for debugging.
     */
    public function __toString()
    {
        return Pel::tra("Dumping Exif data...\n") . $this->tiff->__toString();
    }
}

Name	Size	Permission
PelCanonMakerNotes.php	8958 bytes	0644
PelConvert.php	14173 bytes	0644
PelDataWindow.php	19433 bytes	0644
PelDataWindowOffsetException.php	1141 bytes	0644
PelDataWindowWindowException.php	1378 bytes	0644
PelEntry.php	7985 bytes	0644
PelEntryAscii.php	3793 bytes	0644
PelEntryByte.php	3039 bytes	0644
PelEntryCopyright.php	5324 bytes	0644
PelEntryException.php	2475 bytes	0644
PelEntryLong.php	4156 bytes	0644
PelEntryNumber.php	8694 bytes	0644
PelEntryRational.php	6221 bytes	0644
PelEntrySByte.php	3313 bytes	0644
PelEntrySLong.php	3429 bytes	0644
PelEntrySRational.php	5485 bytes	0644
PelEntrySShort.php	36714 bytes	0644
PelEntryShort.php	15184 bytes	0644
PelEntryTime.php	12303 bytes	0644
PelEntryUndefined.php	5621 bytes	0644
PelEntryUserComment.php	4104 bytes	0644
PelEntryVersion.php	5093 bytes	0644
PelEntryWindowsString.php	5663 bytes	0644
PelException.php	2044 bytes	0644
PelExif.php	4439 bytes	0644
PelFormat.php	6131 bytes	0644
PelIfd.php	56077 bytes	0644
PelIfdException.php	1426 bytes	0644
PelIllegalFormatException.php	1534 bytes	0644
PelInvalidArgumentException.php	1387 bytes	0644
PelInvalidDataException.php	1375 bytes	0644
PelJpeg.php	23082 bytes	0644
PelJpegComment.php	2762 bytes	0644
PelJpegContent.php	2262 bytes	0644
PelJpegInvalidMarkerException.php	1898 bytes	0644
PelJpegMarker.php	11789 bytes	0644
PelMakerNotes.php	2417 bytes	0644
PelMakerNotesMalformedException.php	1676 bytes	0644
PelOverflowException.php	2121 bytes	0644
PelTag.php	69462 bytes	0644
PelTiff.php	10078 bytes	0644
PelWrongComponentCountException.php	2189 bytes	0644

File Content: PelExif.php

File Content: `PelExif.php`