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include/swiftmailer/lib/classes/Swift/CharacterReader/GenericFixedWidthReader.php

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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;
+    }
+}