PhutilStreamIterator.php
b4f38af38480stable

PhutilStreamIterator.php
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			<?php

			final class PhutilStreamIterator
			extends Phobject
			implements Iterator {

			private $stream;
			private $started = false;
			private $naturalKey;
			private $data;

			public function __construct($stream) {
			$this->stream = $stream;
			}

			/* -( Iterator Implementation )-------------------------------------------- */


			public function rewind() {
			if ($this->started) {
			// When you first foreach() an iterator the rewind() method gets called
			// so we have to work the first time.
			throw new Exception(
			pht('Stream iterators can not be rewound!'));
			}

			$this->started = true;
			$this->naturalKey = -1;
			$this->next();
			}

			public function valid() {
			return ($this->data !== null);
			}

			public function current() {
			return $this->data;
			}

			public function key() {
			return $this->naturalKey;
			}

			public function next() {
			$stream = $this->stream;

			if (!$stream) {
			return;
			}

			if (feof($stream)) {
			fclose($stream);
			$this->stream = null;
			$this->data = null;
			return;
			}

			$bytes = fread($stream, 64 * 1024);
			if ($bytes === false) {
			throw new Exception(
			pht('Failed to fread() from request input stream.'));
			}

			$this->data = $bytes;
			$this->naturalKey++;
			}

			}