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<?php |
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/** |
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* This file is part of the PHP Generics package. |
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* |
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* @package Generics |
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*/ |
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namespace Generics\Streams; |
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use Generics\FileNotFoundException; |
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use Generics\LockException; |
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use Generics\Lockable; |
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/** |
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* This class provides an input stream for files. |
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* |
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* @author Maik Greubel <[email protected]> |
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*/ |
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class FileInputStream implements InputStream, Lockable |
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{ |
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/** |
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* The file handle |
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* |
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* @var resource |
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*/ |
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private $handle; |
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/** |
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* The absolute file path and name |
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* |
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* @var string |
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*/ |
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private $fileName; |
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/** |
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* Whether the access is locked |
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* |
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* @var bool |
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*/ |
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private $locked; |
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/** |
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* Create a new FileInputStream |
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* |
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* @param string $file |
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* The absolute (or relative) path to the file to open |
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* @throws FileNotFoundException |
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*/ |
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public function __construct($file) |
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{ |
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if (! file_exists($file)) { |
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throw new FileNotFoundException("File {file} could not be found", array( |
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'file' => $file |
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)); |
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} |
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$this->handle = fopen($file, "rb"); |
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if (! $this->ready()) { |
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throw new StreamException("Could not open {file} for reading", array( |
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'file' => $file |
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)); |
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} |
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$this->fileName = $file; |
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} |
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/** |
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* Cleanup (e.g. |
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* release lock) |
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*/ |
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public function __destruct() |
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{ |
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try { |
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if ($this->locked) { |
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$this->unlock(); |
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} |
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} catch (\Generics\GenericsException $ex) { |
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// Do nothing |
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} |
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} |
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/** |
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* |
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* {@inheritdoc} |
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* @see \Generics\Streams\Stream::close() |
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*/ |
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public function close() |
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{ |
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if ($this->handle != null) { |
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fclose($this->handle); |
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$this->handle = null; |
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} |
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} |
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/** |
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* |
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* {@inheritdoc} |
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* @see \Generics\Streams\Stream::ready() |
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*/ |
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public function ready(): bool |
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{ |
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return is_resource($this->handle) && ! feof($this->handle); |
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} |
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/** |
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* |
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* {@inheritdoc} |
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* @see \Generics\Streams\InputStream::read() |
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*/ |
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public function read($length = 1, $offset = null): string |
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{ |
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if (! $this->ready()) { |
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throw new StreamException("Stream is not ready!"); |
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} |
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if ($offset !== null && intval($offset) > 0) { |
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if (fseek($this->handle, $offset, SEEK_SET) != 0) { |
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throw new StreamException("Could not set offset!"); |
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} |
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} |
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return fread($this->handle, $length); |
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} |
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/** |
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* |
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* {@inheritdoc} |
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* @see \Countable::count() |
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*/ |
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public function count(): int |
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{ |
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3 |
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$stat = fstat($this->handle); |
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return $stat['size']; |
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} |
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/** |
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* |
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* {@inheritdoc} |
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* @see \Generics\Streams\InputStream::reset() |
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*/ |
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public function reset() |
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{ |
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fseek($this->handle, 0, SEEK_SET); |
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} |
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/** |
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* |
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* {@inheritdoc} |
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* @see \Generics\Lockable::lock() |
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*/ |
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2 |
View Code Duplication |
public function lock() |
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{ |
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if ($this->locked || flock($this->handle, LOCK_SH) === false) { |
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1 |
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throw new LockException("Could not acquire lock"); |
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} |
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2 |
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$this->locked = true; |
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} |
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/** |
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* |
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* {@inheritdoc} |
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* @see \Generics\Lockable::unlock() |
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*/ |
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2 |
View Code Duplication |
public function unlock() |
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{ |
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2 |
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if (! $this->locked || flock($this->handle, LOCK_UN) === false) { |
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throw new LockException("Could not release lock"); |
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} |
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$this->locked = false; |
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} |
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/** |
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* |
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* {@inheritdoc} |
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* @see \Generics\Lockable::isLocked() |
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*/ |
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1 |
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public function isLocked(): bool |
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{ |
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1 |
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return $this->locked; |
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} |
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/** |
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* Retrieve the file path and name |
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* |
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* @return string |
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*/ |
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public function __toString(): string |
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{ |
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return realpath($this->fileName); |
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} |
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/** |
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* |
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* {@inheritdoc} |
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* @see \Generics\Streams\Stream::isOpen() |
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*/ |
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public function isOpen(): bool |
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{ |
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return is_resource($this->handle); |
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} |
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} |
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maikgreubel /
phpgenerics
