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<?php |
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/** |
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* This file is part of graze/csv-token |
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* |
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* Copyright (c) 2016 Nature Delivered Ltd. <https://www.graze.com> |
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* |
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* For the full copyright and license information, please view the LICENSE |
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* file that was distributed with this source code. |
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* |
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* @license https://github.com/graze/csv-token/blob/master/LICENSE.md |
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* @link https://github.com/graze/csv-token |
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*/ |
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namespace Graze\CsvToken\Buffer; |
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class StreamBuffer implements BufferInterface |
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{ |
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const READ_LENGTH = 128; |
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/** @var string */ |
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protected $contents; |
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/** @var int */ |
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protected $length; |
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/** @var int */ |
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protected $position; |
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/** @var bool */ |
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protected $eof = false; |
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/** @var int */ |
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protected $minSize; |
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/** @var resource */ |
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private $stream; |
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/** @var int */ |
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private $readLength; |
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/** |
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* Create a buffer around a stream |
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* |
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* @param resource $stream |
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* @param int $readLength |
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* @param int $minSize |
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*/ |
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public function __construct($stream, $readLength = self::READ_LENGTH, $minSize = -1) |
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{ |
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$this->stream = $stream; |
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$this->readLength = $readLength; |
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$this->position = ftell($stream); |
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$this->minSize = $minSize; |
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$this->length = 0; |
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$this->eof = false; |
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} |
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/** |
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* @return string |
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*/ |
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public function getContents() |
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{ |
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return $this->contents; |
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} |
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/** |
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* @return int |
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*/ |
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public function getLength() |
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{ |
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return $this->length; |
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} |
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/** |
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* @return bool |
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*/ |
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public function isEof() |
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{ |
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return $this->length === 0; |
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} |
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/** |
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* @return bool |
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*/ |
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public function read() |
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{ |
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if ($this->canRead()) { |
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$next = fread($this->stream, $this->readLength); |
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if (strlen($next) > 0) { |
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$this->contents .= $next; |
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$this->length += strlen($next); |
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return true; |
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} else { |
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$this->eof = true; |
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} |
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} |
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return false; |
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} |
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/** |
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* Remove the first $length characters from the buffer |
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* |
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* @param int $length |
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* |
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* @return bool |
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*/ |
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public function move($length) |
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{ |
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$this->contents = substr($this->contents, $length); |
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$newLen = max(0, $this->length - $length); |
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$this->position += $this->length - $newLen; |
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$this->length = $newLen; |
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return true; |
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} |
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/** |
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* Determine if we can read more from the stream |
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* |
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* @return bool |
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*/ |
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private function canRead() |
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{ |
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return ((!$this->eof) |
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&& ($this->minSize < 0 || $this->length <= $this->minSize)); |
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} |
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/** |
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* @return bool |
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*/ |
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public function isSourceEof() |
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{ |
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return $this->eof; |
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} |
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/** |
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* @return int |
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*/ |
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public function getPosition() |
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{ |
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return $this->position; |
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} |
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/** |
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* @return int |
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*/ |
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1 |
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public function getMinBufferSize() |
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{ |
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1 |
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return $this->minSize; |
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} |
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/** |
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* @param int $size |
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* |
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* @return $this |
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*/ |
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public function setMinBufferSize($size) |
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{ |
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$this->minSize = $size; |
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return $this; |
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} |
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} |
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graze /
csv-token
