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<?php |
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/* |
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* SPDX-License-Identifier: AGPL-3.0-only |
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* SPDX-FileCopyrightText: Copyright 2007-2013,2015-2016 Zarafa Deutschland GmbH |
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* SPDX-FileCopyrightText: Copyright 2020-2022 grommunio GmbH |
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* |
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* Wraps a string as a standard php stream |
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* The used method names are predefined and can not be altered. |
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*/ |
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class StringStreamWrapper { |
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public const PROTOCOL = "stringstream"; |
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private $stringstream; |
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private $position; |
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private $stringlength; |
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private $truncateHtmlSafe; |
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private $context; |
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/** |
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* Opens the stream |
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* The string to be streamed is passed over the context. |
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* |
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* @param string $path Specifies the URL that was passed to the original function |
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* @param string $mode The mode used to open the file, as detailed for fopen() |
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* @param int $options Holds additional flags set by the streams API |
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* @param string $opened_path if the path is opened successfully, and STREAM_USE_PATH is set in options, |
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* opened_path should be set to the full path of the file/resource that was actually opened |
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* |
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* @return bool |
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*/ |
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public function stream_open($path, $mode, $options, &$opened_path) { |
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$contextOptions = stream_context_get_options($this->context); |
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if (!isset($contextOptions[self::PROTOCOL]['string'])) { |
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return false; |
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} |
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$this->position = 0; |
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// this is our stream! |
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$this->stringstream = $contextOptions[self::PROTOCOL]['string']; |
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$this->truncateHtmlSafe = $contextOptions[self::PROTOCOL]['truncatehtmlsafe'] ?? false; |
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$this->stringlength = strlen($this->stringstream); |
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SLog::Write(LOGLEVEL_DEBUG, sprintf("StringStreamWrapper::stream_open(): initialized stream length: %d - HTML-safe-truncate: %s", $this->stringlength, Utils::PrintAsString($this->truncateHtmlSafe))); |
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return true; |
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} |
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/** |
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* Reads from stream. |
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* |
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* @param int $len amount of bytes to be read |
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* |
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* @return string |
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*/ |
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public function stream_read($len) { |
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$data = substr((string) $this->stringstream, $this->position, $len); |
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$this->position += strlen($data); |
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return $data; |
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} |
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/** |
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* Writes data to the stream. |
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* |
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* @param string $data |
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* |
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* @return int |
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*/ |
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public function stream_write($data) { |
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$l = strlen($data); |
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$this->stringstream = substr((string) $this->stringstream, 0, $this->position) . $data . substr((string) $this->stringstream, $this->position += $l); |
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$this->stringlength = strlen($this->stringstream); |
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return $l; |
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} |
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/** |
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* Stream "seek" functionality. |
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* |
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* @param int $offset |
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* @param int $whence |
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* |
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* @return bool |
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*/ |
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public function stream_seek($offset, $whence = SEEK_SET) { |
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if ($whence == SEEK_CUR) { |
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$this->position += $offset; |
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} |
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elseif ($whence == SEEK_END) { |
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$this->position = $this->stringlength + $offset; |
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} |
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else { |
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$this->position = $offset; |
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} |
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return true; |
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} |
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/** |
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* Returns the current position on stream. |
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* |
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* @return int |
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*/ |
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public function stream_tell() { |
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return $this->position; |
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} |
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/** |
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* Indicates if 'end of file' is reached. |
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* |
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* @return bool |
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*/ |
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public function stream_eof() { |
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return $this->position >= $this->stringlength; |
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} |
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/** |
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* Truncates the stream to the new size. |
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* |
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* @param int $new_size |
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* |
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* @return bool |
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*/ |
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public function stream_truncate($new_size) { |
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// cut the string! |
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$this->stringstream = Utils::Utf8_truncate($this->stringstream, $new_size, $this->truncateHtmlSafe); |
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$this->stringlength = strlen($this->stringstream); |
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if ($this->position > $this->stringlength) { |
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SLog::Write(LOGLEVEL_WARN, sprintf("StringStreamWrapper->stream_truncate(): stream position (%d) ahead of new size of %d. Repositioning pointer to end of stream.", $this->position, $this->stringlength)); |
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$this->position = $this->stringlength; |
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} |
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return true; |
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} |
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/** |
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* Retrieves information about a stream. |
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* |
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* @return array |
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*/ |
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public function stream_stat() { |
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return [ |
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7 => $this->stringlength, |
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'size' => $this->stringlength, |
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]; |
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} |
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/** |
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* Instantiates a StringStreamWrapper. |
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* |
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* @param string $string The string to be wrapped |
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* @param bool $truncatehtmlsafe Indicates if a truncation should be done html-safe - default: false |
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* |
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* @return StringStreamWrapper |
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*/ |
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public static function Open($string, $truncatehtmlsafe = false) { |
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$context = stream_context_create([self::PROTOCOL => ['string' => &$string, 'truncatehtmlsafe' => $truncatehtmlsafe]]); |
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return fopen(self::PROTOCOL . "://", 'r', false, $context); |
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} |
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} |
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stream_wrapper_register(StringStreamWrapper::PROTOCOL, "StringStreamWrapper"); |
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grommunio /
grommunio-sync
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This check looks for parameters that have been defined for a function or method, but which are not used in the method body.