--- /dev/null
+<?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, 2006 Martin Geisler.
+ * Copyright (C) 2017 Johannes Weberhofer.
+ *
+ * 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
+ */
+namespace lsolesen\pel;
+
+/**
+ * Classes for dealing with JPEG markers.
+ *
+ * This class defines the constants to be used whenever one refers to
+ * a JPEG marker. All the methods defined are static, and they all
+ * operate on one argument which should be one of the class constants.
+ * They will all be denoted by PelJpegMarker in the documentation.
+ *
+ * @author Martin Geisler <mgeisler@users.sourceforge.net>
+ * @author Johannes Weberhofer <jweberhofer@weberhofer.at>
+ *
+ * @license http://www.gnu.org/licenses/gpl.html GNU General Public
+ * License (GPL)
+ * @package PEL
+ */
+class PelJpegMarker
+{
+
+ /**
+ * Encoding (baseline)
+ */
+ const SOF0 = 0xC0;
+
+ /**
+ * Encoding (extended sequential)
+ */
+ const SOF1 = 0xC1;
+
+ /**
+ * Encoding (progressive)
+ */
+ const SOF2 = 0xC2;
+
+ /**
+ * Encoding (lossless)
+ */
+ const SOF3 = 0xC3;
+
+ /**
+ * Define Huffman table
+ */
+ const DHT = 0xC4;
+
+ /**
+ * Encoding (differential sequential)
+ */
+ const SOF5 = 0xC5;
+
+ /**
+ * Encoding (differential progressive)
+ */
+ const SOF6 = 0xC6;
+
+ /**
+ * Encoding (differential lossless)
+ */
+ const SOF7 = 0xC7;
+
+ /**
+ * Extension
+ */
+ const JPG = 0xC8;
+
+ /**
+ * Encoding (extended sequential, arithmetic)
+ */
+ const SOF9 = 0xC9;
+
+ /**
+ * Encoding (progressive, arithmetic)
+ */
+ const SOF10 = 0xCA;
+
+ /**
+ * Encoding (lossless, arithmetic)
+ */
+ const SOF11 = 0xCB;
+
+ /**
+ * Define arithmetic coding conditioning
+ */
+ const DAC = 0xCC;
+
+ /**
+ * Encoding (differential sequential, arithmetic)
+ */
+ const SOF13 = 0xCD;
+
+ /**
+ * Encoding (differential progressive, arithmetic)
+ */
+ const SOF14 = 0xCE;
+
+ /**
+ * Encoding (differential lossless, arithmetic)
+ */
+ const SOF15 = 0xCF;
+
+ /**
+ * Restart 0
+ */
+ const RST0 = 0xD0;
+
+ /**
+ * Restart 1
+ */
+ const RST1 = 0xD1;
+
+ /**
+ * Restart 2
+ */
+ const RST2 = 0xD2;
+
+ /**
+ * Restart 3
+ */
+ const RST3 = 0xD3;
+
+ /**
+ * Restart 4
+ */
+ const RST4 = 0xD4;
+
+ /**
+ * Restart 5
+ */
+ const RST5 = 0xD5;
+
+ /**
+ * Restart 6
+ */
+ const RST6 = 0xD6;
+
+ /**
+ * Restart 7
+ */
+ const RST7 = 0xD7;
+
+ /**
+ * Start of image
+ */
+ const SOI = 0xD8;
+
+ /**
+ * End of image
+ */
+ const EOI = 0xD9;
+
+ /**
+ * Start of scan
+ */
+ const SOS = 0xDA;
+
+ /**
+ * Define quantization table
+ */
+ const DQT = 0xDB;
+
+ /**
+ * Define number of lines
+ */
+ const DNL = 0xDC;
+
+ /**
+ * Define restart interval
+ */
+ const DRI = 0xDD;
+
+ /**
+ * Define hierarchical progression
+ */
+ const DHP = 0xDE;
+
+ /**
+ * Expand reference component
+ */
+ const EXP = 0xDF;
+
+ /**
+ * Application segment 0
+ */
+ const APP0 = 0xE0;
+
+ /**
+ * Application segment 1
+ *
+ * When a JPEG image contains Exif data, the data will normally be
+ * stored in this section and a call to {@link PelJpeg::getExif()}
+ * will return a {@link PelExif} object representing it.
+ */
+ const APP1 = 0xE1;
+
+ /**
+ * Application segment 2
+ */
+ const APP2 = 0xE2;
+
+ /**
+ * Application segment 3
+ */
+ const APP3 = 0xE3;
+
+ /**
+ * Application segment 4
+ */
+ const APP4 = 0xE4;
+
+ /**
+ * Application segment 5
+ */
+ const APP5 = 0xE5;
+
+ /**
+ * Application segment 6
+ */
+ const APP6 = 0xE6;
+
+ /**
+ * Application segment 7
+ */
+ const APP7 = 0xE7;
+
+ /**
+ * Application segment 8
+ */
+ const APP8 = 0xE8;
+
+ /**
+ * Application segment 9
+ */
+ const APP9 = 0xE9;
+
+ /**
+ * Application segment 10
+ */
+ const APP10 = 0xEA;
+
+ /**
+ * Application segment 11
+ */
+ const APP11 = 0xEB;
+
+ /**
+ * Application segment 12
+ */
+ const APP12 = 0xEC;
+
+ /**
+ * Application segment 13
+ */
+ const APP13 = 0xED;
+
+ /**
+ * Application segment 14
+ */
+ const APP14 = 0xEE;
+
+ /**
+ * Application segment 15
+ */
+ const APP15 = 0xEF;
+
+ /**
+ * Extension 0
+ */
+ const JPG0 = 0xF0;
+
+ /**
+ * Extension 1
+ */
+ const JPG1 = 0xF1;
+
+ /**
+ * Extension 2
+ */
+ const JPG2 = 0xF2;
+
+ /**
+ * Extension 3
+ */
+ const JPG3 = 0xF3;
+
+ /**
+ * Extension 4
+ */
+ const JPG4 = 0xF4;
+
+ /**
+ * Extension 5
+ */
+ const JPG5 = 0xF5;
+
+ /**
+ * Extension 6
+ */
+ const JPG6 = 0xF6;
+
+ /**
+ * Extension 7
+ */
+ const JPG7 = 0xF7;
+
+ /**
+ * Extension 8
+ */
+ const JPG8 = 0xF8;
+
+ /**
+ * Extension 9
+ */
+ const JPG9 = 0xF9;
+
+ /**
+ * Extension 10
+ */
+ const JPG10 = 0xFA;
+
+ /**
+ * Extension 11
+ */
+ const JPG11 = 0xFB;
+
+ /**
+ * Extension 12
+ */
+ const JPG12 = 0xFC;
+
+ /**
+ * Extension 13
+ */
+ const JPG13 = 0xFD;
+
+ /**
+ * Comment
+ */
+ const COM = 0xFE;
+
+ /**
+ * Values for marker's short names
+ */
+ protected static $jpegMarkerShort = array(
+ self::SOF0 => 'SOF0',
+ self::SOF1 => 'SOF1',
+ self::SOF2 => 'SOF2',
+ self::SOF3 => 'SOF3',
+ self::SOF5 => 'SOF5',
+ self::SOF6 => 'SOF6',
+ self::SOF7 => 'SOF7',
+ self::SOF9 => 'SOF9',
+ self::SOF10 => 'SOF10',
+ self::SOF11 => 'SOF11',
+ self::SOF13 => 'SOF13',
+ self::SOF14 => 'SOF14',
+ self::SOF15 => 'SOF15',
+ self::SOI => 'SOI',
+ self::EOI => 'EOI',
+ self::SOS => 'SOS',
+ self::COM => 'COM',
+ self::DHT => 'DHT',
+ self::JPG => 'JPG',
+ self::DAC => 'DAC',
+ self::RST0 => 'RST0',
+ self::RST1 => 'RST1',
+ self::RST2 => 'RST2',
+ self::RST3 => 'RST3',
+ self::RST4 => 'RST4',
+ self::RST5 => 'RST5',
+ self::RST6 => 'RST6',
+ self::RST7 => 'RST7',
+ self::DQT => 'DQT',
+ self::DNL => 'DNL',
+ self::DRI => 'DRI',
+ self::DHP => 'DHP',
+ self::EXP => 'EXP',
+ self::APP0 => 'APP0',
+ self::APP1 => 'APP1',
+ self::APP2 => 'APP2',
+ self::APP3 => 'APP3',
+ self::APP4 => 'APP4',
+ self::APP5 => 'APP5',
+ self::APP6 => 'APP6',
+ self::APP7 => 'APP7',
+ self::APP8 => 'APP8',
+ self::APP9 => 'APP9',
+ self::APP10 => 'APP10',
+ self::APP11 => 'APP11',
+ self::APP12 => 'APP12',
+ self::APP13 => 'APP13',
+ self::APP14 => 'APP14',
+ self::APP15 => 'APP15',
+ self::JPG0 => 'JPG0',
+ self::JPG1 => 'JPG1',
+ self::JPG2 => 'JPG2',
+ self::JPG3 => 'JPG3',
+ self::JPG4 => 'JPG4',
+ self::JPG5 => 'JPG5',
+ self::JPG6 => 'JPG6',
+ self::JPG7 => 'JPG7',
+ self::JPG8 => 'JPG8',
+ self::JPG9 => 'JPG9',
+ self::JPG10 => 'JPG10',
+ self::JPG11 => 'JPG11',
+ self::JPG12 => 'JPG12',
+ self::JPG13 => 'JPG13',
+ self::COM => 'COM'
+ );
+
+ /**
+ * Values for marker's descriptions names.
+ */
+ protected static $jpegMarkerDescriptions = array(
+ self::SOF0 => 'Encoding (baseline)',
+ self::SOF1 => 'Encoding (extended sequential)',
+ self::SOF2 => 'Encoding (progressive)',
+ self::SOF3 => 'Encoding (lossless)',
+ self::SOF5 => 'Encoding (differential sequential)',
+ self::SOF6 => 'Encoding (differential progressive)',
+ self::SOF7 => 'Encoding (differential lossless)',
+ self::SOF9 => 'Encoding (extended sequential, arithmetic)',
+ self::SOF10 => 'Encoding (progressive, arithmetic)',
+ self::SOF11 => 'Encoding (lossless, arithmetic)',
+ self::SOF13 => 'Encoding (differential sequential, arithmetic)',
+ self::SOF14 => 'Encoding (differential progressive, arithmetic)',
+ self::SOF15 => 'Encoding (differential lossless, arithmetic)',
+ self::SOI => 'Start of image',
+ self::EOI => 'End of image',
+ self::SOS => 'Start of scan',
+ self::COM => 'Comment',
+ self::DHT => 'Define Huffman table',
+ self::JPG => 'Extension',
+ self::DAC => 'Define arithmetic coding conditioning',
+ 'RST' => 'Restart %d',
+ self::DQT => 'Define quantization table',
+ self::DNL => 'Define number of lines',
+ self::DRI => 'Define restart interval',
+ self::DHP => 'Define hierarchical progression',
+ self::EXP => 'Expand reference component',
+ 'APP' => 'Application segment %d',
+ 'JPG' => 'Extension %d',
+ self::COM => 'Comment'
+ );
+
+ /**
+ * Check if a byte is a valid JPEG marker.
+ * If the byte is recognized true is returned, otherwise false will be returned.
+ *
+ * @param integer $marker
+ * the marker as defined in {@link PelJpegMarker}
+ *
+ * @return boolean
+ */
+ public static function isValid($marker)
+ {
+ return ($marker >= self::SOF0 && $marker <= self::COM);
+ }
+
+ /**
+ * Turn a JPEG marker into bytes.
+ * This will be a string with just a single byte since all JPEG markers are simply single bytes.
+ *
+ * @param integer $marker
+ * the marker as defined in {@link PelJpegMarker}
+ *
+ * @return string
+ */
+ public static function getBytes($marker)
+ {
+ return chr($marker);
+ }
+
+ /**
+ * Return the short name for a marker, e.g., 'SOI' for the Start
+ * of Image marker.
+ *
+ * @param integer $marker
+ * the marker as defined in {@link PelJpegMarker}
+ *
+ * @return string
+ */
+ public static function getName($marker)
+ {
+ if (array_key_exists($marker, self::$jpegMarkerShort)) {
+ return self::$jpegMarkerShort[$marker];
+ } else {
+ return Pel::fmt('Unknown marker: 0x%02X', $marker);
+ }
+ }
+
+ /**
+ * Returns a description of a JPEG marker.
+ *
+ * @param integer $marker
+ * the marker as defined in {@link PelJpegMarker}
+ *
+ * @return string
+ */
+ public static function getDescription($marker)
+ {
+ if (array_key_exists($marker, self::$jpegMarkerShort)) {
+ if (array_key_exists($marker, self::$jpegMarkerDescriptions)) {
+ return self::$jpegMarkerDescriptions[$marker];
+ } else {
+ $splitted = preg_split(
+ "/(\d+)/",
+ self::$jpegMarkerShort[$marker],
+ - 1,
+ PREG_SPLIT_NO_EMPTY | PREG_SPLIT_DELIM_CAPTURE);
+ if ((count($splitted) == 2) && array_key_exists($splitted[0], self::$jpegMarkerDescriptions)) {
+ return Pel::fmt(self::$jpegMarkerDescriptions[$splitted[0]], $splitted[1]);
+ }
+ }
+ }
+ return Pel::fmt('Unknown marker: 0x%02X', $marker);
+ }
+}
projects / yaffs-website / blobdiff