--- /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, 2005 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;
+
+/**
+ * Namespace for functions operating on Exif formats.
+ *
+ * This class defines the constants that are to be used whenever one
+ * has to refer to the format of an Exif tag. They will be
+ * collectively denoted by the pseudo-type PelFormat throughout the
+ * documentation.
+ *
+ * All the methods defined here are static, and they all operate on a
+ * single argument which should be one of the class constants.
+ *
+ * @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
+ *
+ */
+class PelFormat
+{
+
+ /**
+ * Unsigned byte.
+ *
+ * Each component will be an unsigned 8-bit integer with a value
+ * between 0 and 255.
+ *
+ * Modelled with the {@link PelEntryByte} class.
+ */
+ const BYTE = 1;
+
+ /**
+ * ASCII string.
+ *
+ * Each component will be an ASCII character.
+ *
+ * Modelled with the {@link PelEntryAscii} class.
+ */
+ const ASCII = 2;
+
+ /**
+ * Unsigned short.
+ *
+ * Each component will be an unsigned 16-bit integer with a value
+ * between 0 and 65535.
+ *
+ * Modelled with the {@link PelEntryShort} class.
+ */
+ const SHORT = 3;
+
+ /**
+ * Unsigned long.
+ *
+ * Each component will be an unsigned 32-bit integer with a value
+ * between 0 and 4294967295.
+ *
+ * Modelled with the {@link PelEntryLong} class.
+ */
+ const LONG = 4;
+
+ /**
+ * Unsigned rational number.
+ *
+ * Each component will consist of two unsigned 32-bit integers
+ * denoting the enumerator and denominator. Each integer will have
+ * a value between 0 and 4294967295.
+ *
+ * Modelled with the {@link PelEntryRational} class.
+ */
+ const RATIONAL = 5;
+
+ /**
+ * Signed byte.
+ *
+ * Each component will be a signed 8-bit integer with a value
+ * between -128 and 127.
+ *
+ * Modelled with the {@link PelEntrySByte} class.
+ */
+ const SBYTE = 6;
+
+ /**
+ * Undefined byte.
+ *
+ * Each component will be a byte with no associated interpretation.
+ *
+ * Modelled with the {@link PelEntryUndefined} class.
+ */
+ const UNDEFINED = 7;
+
+ /**
+ * Signed short.
+ *
+ * Each component will be a signed 16-bit integer with a value
+ * between -32768 and 32767.
+ *
+ * Modelled with the {@link PelEntrySShort} class.
+ */
+ const SSHORT = 8;
+
+ /**
+ * Signed long.
+ *
+ * Each component will be a signed 32-bit integer with a value
+ * between -2147483648 and 2147483647.
+ *
+ * Modelled with the {@link PelEntrySLong} class.
+ */
+ const SLONG = 9;
+
+ /**
+ * Signed rational number.
+ *
+ * Each component will consist of two signed 32-bit integers
+ * denoting the enumerator and denominator. Each integer will have
+ * a value between -2147483648 and 2147483647.
+ *
+ * Modelled with the {@link PelEntrySRational} class.
+ */
+ const SRATIONAL = 10;
+
+ /**
+ * Floating point number.
+ *
+ * Entries with this format are not currently implemented.
+ */
+ const FLOAT = 11;
+
+ /**
+ * Double precision floating point number.
+ *
+ * Entries with this format are not currently implemented.
+ */
+ const DOUBLE = 12;
+
+ /**
+ * Values for format's short names
+ */
+ protected static $formatName = array(
+ self::ASCII => 'Ascii',
+ self::BYTE => 'Byte',
+ self::SHORT => 'Short',
+ self::LONG => 'Long',
+ self::RATIONAL => 'Rational',
+ self::SBYTE => 'SByte',
+ self::SSHORT => 'SShort',
+ self::SLONG => 'SLong',
+ self::SRATIONAL => 'SRational',
+ self::FLOAT => 'Float',
+ self::DOUBLE => 'Double',
+ self::UNDEFINED => 'Undefined'
+ );
+
+ protected static $formatLength = array(
+ self::ASCII => 1,
+ self::BYTE => 1,
+ self::SHORT => 2,
+ self::LONG => 4,
+ self::RATIONAL => 8,
+ self::SBYTE => 1,
+ self::SSHORT => 2,
+ self::SLONG => 4,
+ self::SRATIONAL => 8,
+ self::FLOAT => 4,
+ self::DOUBLE => 8,
+ self::UNDEFINED => 1
+ );
+
+ /**
+ * Returns the name of a format like 'Ascii' for the {@link ASCII} format
+ *
+ * @param integer $type
+ * as defined in {@link PelFormat}
+ * @return string
+ */
+ public static function getName($type)
+ {
+ if (array_key_exists($type, self::$formatName)) {
+ return self::$formatName[$type];
+ } else {
+ return Pel::fmt('Unknown format: 0x%X', $type);
+ }
+ }
+
+ /**
+ * Return the size of components in a given format in bytes needed to store one component with the
+ * given format.
+ *
+ * @param integer $type
+ * as defined in {@link PelFormat}
+ * @return integer|string
+ */
+ public static function getSize($type)
+ {
+ if (array_key_exists($type, self::$formatLength)) {
+ return self::$formatLength[$type];
+ } else {
+ return Pel::fmt('Unknown format: 0x%X', $type);
+ }
+ }
+}
projects / yaffs-website / blobdiff