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1 <?php |
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2 |
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3 /* |
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4 * This file is part of SwiftMailer. |
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5 * (c) 2004-2009 Chris Corbyn |
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6 * |
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7 * For the full copyright and license information, please view the LICENSE |
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8 * file that was distributed with this source code. |
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9 */ |
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10 |
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11 |
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12 /** |
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13 * Provides fixed-width byte sizes for reading fixed-width character sets. |
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14 * @package Swift |
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15 * @subpackage Encoder |
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16 * @author Chris Corbyn |
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17 * @author Xavier De Cock <xdecock@gmail.com> |
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18 */ |
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19 class Swift_CharacterReader_GenericFixedWidthReader |
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20 implements Swift_CharacterReader |
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21 { |
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22 |
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23 /** |
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24 * The number of bytes in a single character. |
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25 * @var int |
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26 * @access private |
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27 */ |
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28 private $_width; |
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29 |
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30 /** |
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31 * Creates a new GenericFixedWidthReader using $width bytes per character. |
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32 * @param int $width |
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33 */ |
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34 public function __construct($width) |
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35 { |
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36 $this->_width = $width; |
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37 } |
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38 |
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39 /** |
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40 * Returns the complete charactermap |
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41 * |
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42 * @param string $string |
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43 * @param int $startOffset |
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44 * @param array $currentMap |
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45 * @param mixed $ignoredChars |
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46 * @return $int |
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47 */ |
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48 public function getCharPositions($string, $startOffset, &$currentMap, &$ignoredChars) |
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49 { |
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50 $strlen = strlen($string); |
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51 // % and / are CPU intensive, so, maybe find a better way |
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52 $ignored = $strlen%$this->_width; |
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53 $ignoredChars = substr($string, - $ignored); |
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54 $currentMap = $this->_width; |
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55 return ($strlen - $ignored)/$this->_width; |
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56 |
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57 } |
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58 |
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59 /** |
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60 * Returns mapType |
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61 * @int mapType |
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62 */ |
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63 public function getMapType() |
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64 { |
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65 return self::MAP_TYPE_FIXED_LEN; |
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66 } |
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67 |
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68 /** |
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69 * Returns an integer which specifies how many more bytes to read. |
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70 * A positive integer indicates the number of more bytes to fetch before invoking |
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71 * this method again. |
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72 * A value of zero means this is already a valid character. |
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73 * A value of -1 means this cannot possibly be a valid character. |
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74 * @param string $bytes |
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75 * @return int |
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76 */ |
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77 public function validateByteSequence($bytes, $size) |
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78 { |
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79 $needed = $this->_width - $size; |
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80 return ($needed > -1) |
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81 ? $needed |
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82 : -1 |
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83 ; |
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84 } |
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85 |
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86 /** |
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87 * Returns the number of bytes which should be read to start each character. |
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88 * @return int |
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89 */ |
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90 public function getInitialByteSize() |
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91 { |
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92 return $this->_width; |
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93 } |
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94 |
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95 } |