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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.
+ */
+
+/**
+ * Analyzes US-ASCII characters.
+ *
+ * @author Chris Corbyn
+ */
+class Swift_CharacterReader_UsAsciiReader implements Swift_CharacterReader
+{
+ /**
+ * Returns the complete character map.
+ *
+ * @param string $string
+ * @param int $startOffset
+ * @param array $currentMap
+ * @param string $ignoredChars
+ *
+ * @return int
+ */
+ public function getCharPositions($string, $startOffset, &$currentMap, &$ignoredChars)
+ {
+ $strlen = strlen($string);
+ $ignoredChars = '';
+ for ($i = 0; $i < $strlen; ++$i) {
+ if ($string[$i] > "\x07F") {
+ // Invalid char
+ $currentMap[$i + $startOffset] = $string[$i];
+ }
+ }
+
+ return $strlen;
+ }
+
+ /**
+ * Returns mapType.
+ *
+ * @return int mapType
+ */
+ public function getMapType()
+ {
+ return self::MAP_TYPE_INVALID;
+ }
+
+ /**
+ * 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)
+ {
+ $byte = reset($bytes);
+ if (1 == count($bytes) && $byte >= 0x00 && $byte <= 0x7F) {
+ return 0;
+ }
+
+ return -1;
+ }
+
+ /**
+ * Returns the number of bytes which should be read to start each character.
+ *
+ * @return int
+ */
+ public function getInitialByteSize()
+ {
+ return 1;
+ }
+}