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);
	}

	}