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<?php |
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namespace WebStream\IO; |
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use WebStream\Exception\Extend\InvalidArgumentException; |
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use WebStream\Exception\Extend\IOException; |
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/** |
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* FileInputStream |
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* @author Ryuichi TANAKA. |
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* @since 2016/02/05 |
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* @version 0.7 |
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*/ |
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class FileInputStream extends InputStream |
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{ |
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/** |
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* @var File ファイルオブジェクト |
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*/ |
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protected $file; |
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/** |
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* constructor |
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* @param mixed $file ファイルオブジェクトまたはファイルパス |
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* @throws InvalidArgumentException |
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* @throws IOException |
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*/ |
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public function __construct($file) |
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{ |
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if ($file instanceof File) { |
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$this->file = $file; |
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} elseif (is_string($file)) { |
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$this->file = new File($file); |
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} else { |
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throw new InvalidArgumentException("Unable to open file: " . $file); |
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} |
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// 読み込みはロックを掛けずダーティーリード |
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$stream = fopen($this->file->getAbsoluteFilePath(), 'r'); |
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if (!is_resource($stream) || $stream === false) { |
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throw new IOException("Unable open " . $this->file->getAbsoluteFilePath()); |
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} |
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parent::__construct($stream); |
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} |
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/** |
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* 入力ストリームを閉じる |
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*/ |
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public function close() |
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{ |
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if ($this->stream === null) { |
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return; |
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} |
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if (get_resource_type($this->stream) !== 'Unknown' && fclose($this->stream) === false) { |
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throw new IOException("Cannot close input stream."); |
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} |
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$this->stream = null; |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function read($length = null) |
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{ |
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if ($this->stream === null) { |
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return null; |
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} |
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if ($this->eof()) { |
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return null; |
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} |
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$out = null; |
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if ($length === null) { |
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if (($out = @fread($this->stream, 1)) === false) { |
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throw new IOException("Failed to read stream."); |
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} |
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} else { |
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if (!is_int($length)) { |
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throw new InvalidArgumentException("Stream read must be a numeric value."); |
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} |
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// 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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// 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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// すでに終端位置の場合、空文字を返す |
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if (($out = @fread($this->stream, $length)) === false) { |
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throw new IOException("Failed to read stream."); |
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} |
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} |
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return $out; |
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} |
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/** |
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* 入力ストリームから行単位でデータを読み込む |
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* 末尾に改行コードは含まない |
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* @return string 読み込みデータ |
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*/ |
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public function readLine() |
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{ |
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if ($this->stream === null) { |
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return null; |
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} |
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if ($this->eof()) { |
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return null; |
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} |
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$out = fgets($this->stream); |
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if ($out === false) { |
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return null; |
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} |
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$this->cursorPosition = ftell($this->stream); |
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return trim($out); |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function skip(int $pos) |
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{ |
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if ($this->stream === null) { |
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return -1; |
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} |
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// 現在のポインタ位置から$posだけ後方へ移動 |
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// シークに対応していないファイルシステムの場合、-1を返す |
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if (fseek($this->stream, $pos, SEEK_CUR) === -1) { |
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return -1; |
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} |
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$start = $this->cursorPosition; |
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$this->cursorPosition = ftell($this->stream); |
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$skipNum = 0; |
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if ($start > $this->cursorPosition) { |
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// 後方へ移動 |
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$skipNum = $start - $this->cursorPosition; |
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} else { |
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// 前方へ移動 |
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$skipNum = $this->cursorPosition - $start; |
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} |
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return $skipNum; |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function reset() |
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{ |
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if (!$this->isMarkSupported()) { |
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throw new IOException(get_class($this) . " does not support mark and reset."); |
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} |
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if ($this->stream === null) { |
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return; |
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} |
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// ポインタ位置をmark位置に移動 |
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fseek($this->stream, $this->markedPosition, SEEK_SET); |
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// mark位置を初期値に戻す |
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$this->cursorPosition = $this->markedPosition; |
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$this->markedPosition = 0; |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function eof() |
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{ |
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return feof($this->stream); |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function isMarkSupported() |
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{ |
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return true; |
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} |
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} |
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webstream-framework /
ClassLoader
