1 | <?php |
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13 | class FileInputStream extends InputStream |
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14 | { |
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15 | /** |
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16 | * @var File ファイルオブジェクト |
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17 | */ |
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18 | protected $file; |
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19 | |||
20 | /** |
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21 | * constructor |
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22 | * @param mixed $file ファイルオブジェクトまたはファイルパス |
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23 | * @throws InvalidArgumentException |
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24 | * @throws IOException |
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25 | */ |
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26 | public function __construct($file) |
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27 | { |
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28 | if ($file instanceof File) { |
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29 | $this->file = $file; |
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30 | } elseif (is_string($file)) { |
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31 | $this->file = new File($file); |
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32 | } else { |
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33 | throw new InvalidArgumentException("Unable to open file: " . $file); |
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34 | } |
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35 | |||
36 | // 読み込みはロックを掛けずダーティーリード |
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37 | $stream = fopen($this->file->getAbsoluteFilePath(), 'r'); |
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38 | if (!is_resource($stream) || $stream === false) { |
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39 | throw new IOException("Unable open " . $this->file->getAbsoluteFilePath()); |
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40 | } |
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41 | |||
42 | parent::__construct($stream); |
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43 | } |
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44 | |||
45 | /** |
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46 | * 入力ストリームを閉じる |
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47 | */ |
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48 | public function close() |
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49 | { |
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50 | if ($this->stream === null) { |
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51 | return; |
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52 | } |
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53 | |||
54 | if (get_resource_type($this->stream) !== 'Unknown' && fclose($this->stream) === false) { |
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55 | throw new IOException("Cannot close input stream."); |
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56 | } |
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57 | |||
58 | $this->stream = null; |
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59 | } |
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60 | |||
61 | /** |
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62 | * {@inheritdoc} |
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63 | */ |
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64 | public function read($length = null) |
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65 | { |
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66 | if ($this->stream === null) { |
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67 | return null; |
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68 | } |
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69 | |||
70 | if ($this->eof()) { |
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71 | return null; |
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72 | } |
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73 | |||
74 | $out = null; |
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75 | if ($length === null) { |
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76 | if (($out = @fread($this->stream, 1)) === false) { |
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77 | throw new IOException("Failed to read stream."); |
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78 | } |
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79 | } else { |
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80 | if (!is_int($length)) { |
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81 | throw new InvalidArgumentException("Stream read must be a numeric value."); |
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82 | } |
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83 | // ポインタ位置が負になった場合、警告が出てfalseを返す |
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84 | // ポインタの終端を越えた場合、読み込みを終了する |
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85 | // すでに終端位置の場合、空文字を返す |
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86 | if (($out = @fread($this->stream, $length)) === false) { |
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87 | throw new IOException("Failed to read stream."); |
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88 | } |
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89 | } |
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90 | |||
91 | return $out; |
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92 | } |
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93 | |||
94 | /** |
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95 | * 入力ストリームから行単位でデータを読み込む |
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96 | * 末尾に改行コードは含まない |
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97 | * @return string 読み込みデータ |
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98 | */ |
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99 | public function readLine() |
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100 | { |
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101 | if ($this->stream === null) { |
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102 | return null; |
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103 | } |
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104 | |||
105 | if ($this->eof()) { |
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106 | return null; |
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107 | } |
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108 | |||
109 | $out = fgets($this->stream); |
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110 | if ($out === false) { |
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111 | return null; |
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112 | } |
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113 | |||
114 | $this->cursorPosition = ftell($this->stream); |
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115 | |||
116 | return trim($out); |
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117 | } |
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118 | |||
119 | /** |
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120 | * {@inheritdoc} |
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121 | */ |
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122 | public function skip(int $pos) |
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123 | { |
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124 | if ($this->stream === null) { |
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125 | return -1; |
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126 | } |
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127 | |||
128 | // 現在のポインタ位置から$posだけ後方へ移動 |
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129 | // シークに対応していないファイルシステムの場合、-1を返す |
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130 | if (fseek($this->stream, $pos, SEEK_CUR) === -1) { |
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131 | return -1; |
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132 | } |
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133 | |||
134 | $start = $this->cursorPosition; |
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135 | $this->cursorPosition = ftell($this->stream); |
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136 | |||
137 | $skipNum = 0; |
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138 | if ($start > $this->cursorPosition) { |
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139 | // 後方へ移動 |
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140 | $skipNum = $start - $this->cursorPosition; |
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141 | } else { |
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142 | // 前方へ移動 |
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143 | $skipNum = $this->cursorPosition - $start; |
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144 | } |
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145 | |||
146 | return $skipNum; |
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147 | } |
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148 | |||
149 | /** |
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150 | * {@inheritdoc} |
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151 | */ |
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152 | public function reset() |
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153 | { |
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154 | if (!$this->isMarkSupported()) { |
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155 | throw new IOException(get_class($this) . " does not support mark and reset."); |
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156 | } |
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157 | |||
158 | if ($this->stream === null) { |
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159 | return; |
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160 | } |
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161 | |||
162 | // ポインタ位置をmark位置に移動 |
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163 | fseek($this->stream, $this->markedPosition, SEEK_SET); |
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164 | // mark位置を初期値に戻す |
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165 | $this->cursorPosition = $this->markedPosition; |
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166 | $this->markedPosition = 0; |
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167 | } |
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168 | |||
169 | /** |
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170 | * {@inheritdoc} |
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171 | */ |
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172 | public function eof() |
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173 | { |
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174 | return feof($this->stream); |
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175 | } |
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176 | |||
177 | /** |
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178 | * {@inheritdoc} |
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179 | */ |
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180 | public function isMarkSupported() |
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181 | { |
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182 | return true; |
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183 | } |
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184 | } |
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185 |