testing

PhabricatorFileChunkIterator.php
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			<?php

			final class PhabricatorFileChunkIterator
			extends Phobject
			implements Iterator {

			private $chunks;
			private $cursor;
			private $begin;
			private $end;
			private $data;

			public function __construct(array $chunks, $begin = null, $end = null) {
			$chunks = msort($chunks, 'getByteStart');
			$this->chunks = $chunks;

			if ($begin !== null) {
			foreach ($chunks as $key => $chunk) {
			if ($chunk->getByteEnd() >= $begin) {
			unset($chunks[$key]);
			}
			break;
			}
			$this->begin = $begin;
			}

			if ($end !== null) {
			foreach ($chunks as $key => $chunk) {
			if ($chunk->getByteStart() <= $end) {
			unset($chunks[$key]);
			}
			}
			$this->end = $end;
			}
			}

			public function current() {
			$chunk = head($this->chunks);
			$data = $chunk->getDataFile()->loadFileData();

			if ($this->end !== null) {
			if ($chunk->getByteEnd() > $this->end) {
			$data = substr($data, 0, ($this->end - $chunk->getByteStart()));
			}
			}

			if ($this->begin !== null) {
			if ($chunk->getByteStart() < $this->begin) {
			$data = substr($data, ($this->begin - $chunk->getByteStart()));
			}
			}

			return $data;
			}

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

			public function next() {
			unset($this->chunks[$this->key()]);
			}

			public function rewind() {
			return;
			}

			public function valid() {
			return (count($this->chunks) > 0);
			}

			}