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+<?php
+
+/*
+ * This file is part of SwiftMailer.
+ * (c) 2004-2009 Chris Corbyn
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * Provides fixed-width byte sizes for reading fixed-width character sets.
+ *
+ * @author Chris Corbyn
+ * @author Xavier De Cock <xdecock@gmail.com>
+ */
+class Swift_CharacterReader_GenericFixedWidthReader implements Swift_CharacterReader
+{
+ /**
+ * The number of bytes in a single character.
+ *
+ * @var int
+ */
+ private $_width;
+
+ /**
+ * Creates a new GenericFixedWidthReader using $width bytes per character.
+ *
+ * @param int $width
+ */
+ public function __construct($width)
+ {
+ $this->_width = $width;
+ }
+
+ /**
+ * Returns the complete character map.
+ *
+ * @param string $string
+ * @param int $startOffset
+ * @param array $currentMap
+ * @param mixed $ignoredChars
+ *
+ * @return int
+ */
+ public function getCharPositions($string, $startOffset, &$currentMap, &$ignoredChars)
+ {
+ $strlen = strlen($string);
+ // % and / are CPU intensive, so, maybe find a better way
+ $ignored = $strlen % $this->_width;
+ $ignoredChars = $ignored ? substr($string, -$ignored) : '';
+ $currentMap = $this->_width;
+
+ return ($strlen - $ignored) / $this->_width;
+ }
+
+ /**
+ * Returns the mapType.
+ *
+ * @return int
+ */
+ public function getMapType()
+ {
+ return self::MAP_TYPE_FIXED_LEN;
+ }
+
+ /**
+ * Returns an integer which specifies how many more bytes to read.
+ *
+ * A positive integer indicates the number of more bytes to fetch before invoking
+ * this method again.
+ *
+ * A value of zero means this is already a valid character.
+ * A value of -1 means this cannot possibly be a valid character.
+ *
+ * @param string $bytes
+ * @param int $size
+ *
+ * @return int
+ */
+ public function validateByteSequence($bytes, $size)
+ {
+ $needed = $this->_width - $size;
+
+ return $needed > -1 ? $needed : -1;
+ }
+
+ /**
+ * Returns the number of bytes which should be read to start each character.
+ *
+ * @return int
+ */
+ public function getInitialByteSize()
+ {
+ return $this->_width;
+ }
+}