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39 | PointedEar | 1 | <?php |
2 | /** |
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3 | * Zend Framework (http://framework.zend.com/) |
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4 | * |
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5 | * @link http://github.com/zendframework/zf2 for the canonical source repository |
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6 | * @copyright Copyright (c) 2005-2013 Zend Technologies USA Inc. (http://www.zend.com) |
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7 | * @license http://framework.zend.com/license/new-bsd New BSD License |
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8 | */ |
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9 | |||
10 | namespace Zend\I18n\Translator\Loader; |
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11 | |||
12 | use Zend\I18n\Exception; |
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13 | use Zend\I18n\Translator\Plural\Rule as PluralRule; |
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14 | use Zend\I18n\Translator\TextDomain; |
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15 | use Zend\Stdlib\ErrorHandler; |
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16 | |||
17 | /** |
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18 | * Gettext loader. |
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19 | */ |
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20 | class Gettext implements FileLoaderInterface |
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21 | { |
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22 | /** |
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23 | * Current file pointer. |
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24 | * |
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25 | * @var resource |
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26 | */ |
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27 | protected $file; |
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28 | |||
29 | /** |
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30 | * Whether the current file is little endian. |
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31 | * |
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32 | * @var bool |
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33 | */ |
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34 | protected $littleEndian; |
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35 | |||
36 | /** |
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37 | * load(): defined by FileLoaderInterface. |
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38 | * |
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39 | * @see FileLoaderInterface::load() |
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40 | * @param string $locale |
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41 | * @param string $filename |
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42 | * @return TextDomain |
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43 | * @throws Exception\InvalidArgumentException |
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44 | */ |
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45 | public function load($locale, $filename) |
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46 | { |
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47 | if (!is_file($filename) || !is_readable($filename)) { |
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48 | throw new Exception\InvalidArgumentException(sprintf( |
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49 | 'Could not open file %s for reading', |
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50 | $filename |
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51 | )); |
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52 | } |
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53 | |||
54 | $textDomain = new TextDomain(); |
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55 | |||
56 | ErrorHandler::start(); |
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57 | $this->file = fopen($filename, 'rb'); |
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58 | $error = ErrorHandler::stop(); |
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59 | if (false === $this->file) { |
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60 | throw new Exception\InvalidArgumentException(sprintf( |
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61 | 'Could not open file %s for reading', |
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62 | $filename |
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63 | ), 0, $error); |
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64 | } |
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65 | |||
66 | // Verify magic number |
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67 | $magic = fread($this->file, 4); |
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68 | |||
69 | if ($magic == "\x95\x04\x12\xde") { |
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70 | $this->littleEndian = false; |
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71 | } elseif ($magic == "\xde\x12\x04\x95") { |
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72 | $this->littleEndian = true; |
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73 | } else { |
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74 | fclose($this->file); |
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75 | throw new Exception\InvalidArgumentException(sprintf( |
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76 | '%s is not a valid gettext file', |
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77 | $filename |
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78 | )); |
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79 | } |
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80 | |||
81 | // Verify major revision (only 0 and 1 supported) |
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82 | $majorRevision = ($this->readInteger() >> 16); |
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83 | |||
84 | if ($majorRevision !== 0 && $majorRevision !== 1) { |
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85 | fclose($this->file); |
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86 | throw new Exception\InvalidArgumentException(sprintf( |
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87 | '%s has an unknown major revision', |
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88 | $filename |
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89 | )); |
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90 | } |
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91 | |||
92 | // Gather main information |
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93 | $numStrings = $this->readInteger(); |
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94 | $originalStringTableOffset = $this->readInteger(); |
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95 | $translationStringTableOffset = $this->readInteger(); |
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96 | |||
97 | // Usually there follow size and offset of the hash table, but we have |
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98 | // no need for it, so we skip them. |
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99 | fseek($this->file, $originalStringTableOffset); |
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100 | $originalStringTable = $this->readIntegerList(2 * $numStrings); |
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101 | |||
102 | fseek($this->file, $translationStringTableOffset); |
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103 | $translationStringTable = $this->readIntegerList(2 * $numStrings); |
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104 | |||
105 | // Read in all translations |
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106 | for ($current = 0; $current < $numStrings; $current++) { |
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107 | $sizeKey = $current * 2 + 1; |
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108 | $offsetKey = $current * 2 + 2; |
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109 | $originalStringSize = $originalStringTable[$sizeKey]; |
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110 | $originalStringOffset = $originalStringTable[$offsetKey]; |
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111 | $translationStringSize = $translationStringTable[$sizeKey]; |
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112 | $translationStringOffset = $translationStringTable[$offsetKey]; |
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113 | |||
114 | $originalString = array(''); |
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115 | if ($originalStringSize > 0) { |
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116 | fseek($this->file, $originalStringOffset); |
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117 | $originalString = explode("\0", fread($this->file, $originalStringSize)); |
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118 | } |
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119 | |||
120 | if ($translationStringSize > 0) { |
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121 | fseek($this->file, $translationStringOffset); |
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122 | $translationString = explode("\0", fread($this->file, $translationStringSize)); |
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123 | |||
124 | if (count($originalString) > 1 && count($translationString) > 1) { |
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125 | $textDomain[$originalString[0]] = $translationString; |
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126 | |||
127 | array_shift($originalString); |
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128 | |||
129 | foreach ($originalString as $string) { |
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130 | $textDomain[$string] = ''; |
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131 | } |
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132 | } else { |
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133 | $textDomain[$originalString[0]] = $translationString[0]; |
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134 | } |
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135 | } |
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136 | } |
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137 | |||
138 | // Read header entries |
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139 | if (array_key_exists('', $textDomain)) { |
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140 | $rawHeaders = explode("\n", trim($textDomain[''])); |
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141 | |||
142 | foreach ($rawHeaders as $rawHeader) { |
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143 | list($header, $content) = explode(':', $rawHeader, 2); |
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144 | |||
145 | if (trim(strtolower($header)) === 'plural-forms') { |
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146 | $textDomain->setPluralRule(PluralRule::fromString($content)); |
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147 | } |
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148 | } |
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149 | |||
150 | unset($textDomain['']); |
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151 | } |
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152 | |||
153 | fclose($this->file); |
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154 | |||
155 | return $textDomain; |
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156 | } |
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157 | |||
158 | /** |
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159 | * Read a single integer from the current file. |
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160 | * |
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161 | * @return integer |
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162 | */ |
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163 | protected function readInteger() |
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164 | { |
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165 | if ($this->littleEndian) { |
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166 | $result = unpack('Vint', fread($this->file, 4)); |
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167 | } else { |
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168 | $result = unpack('Nint', fread($this->file, 4)); |
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169 | } |
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170 | |||
171 | return $result['int']; |
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172 | } |
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173 | |||
174 | /** |
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175 | * Read an integer from the current file. |
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176 | * |
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177 | * @param integer $num |
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178 | * @return integer |
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179 | */ |
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180 | protected function readIntegerList($num) |
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181 | { |
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182 | if ($this->littleEndian) { |
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183 | return unpack('V' . $num, fread($this->file, 4 * $num)); |
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184 | } |
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185 | |||
186 | return unpack('N' . $num, fread($this->file, 4 * $num)); |
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187 | } |
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188 | } |