← All changes | libraries/vendor/PhpSpreadsheet/Shared/OLERead.php +19 -0 3.3.3 → 3.4 View file →

		@@ -60,8 +60,11 @@
60	60
61	61	/** @var mixed[][] */
62	62	private array $props = [];
63	63
	64	+ /** @var int[] */
	65	+ private array $possibleLoop = [];
	66	+
64	67	/**
65	68	* Read the file.
66	69	*/
67	70	public function read(string $filename): void
		@@ -136,9 +139,11 @@
136	139	}
137	140
138	141	$sbdBlock = $this->sbdStartBlock;
139	142	$this->smallBlockChain = '';
	143	+ $this->possibleLoop = [];
140	144	while ($sbdBlock != -2) {
	145	+ $this->catchLoop($sbdBlock);
141	146	$pos = ($sbdBlock + 1) * self::BIG_BLOCK_SIZE;
142	147
143	148	$this->smallBlockChain .= substr($this->data, $pos, 4 * $bbs);
144	149	$pos += 4 * $bbs;
		@@ -152,8 +157,16 @@
152	157
153	158	$this->readPropertySets();
154	159	}
155	160
	161	+ private function catchLoop(int $sbdBlock): void
	162	+ {
	163	+ if (in_array($sbdBlock, $this->possibleLoop, true)) {
	164	+ throw new ReaderException('Detected loop while iterating blocks');
	165	+ }
	166	+ $this->possibleLoop[] = $sbdBlock;
	167	+ }
	168	+
156	169	/**
157	170	* Extract binary stream data.
158	171	*/
159	172	public function getStream(?int $stream): ?string
		@@ -171,9 +184,11 @@
171	184
172	185	/** @var int */
173	186	$block = $this->props[$stream]['startBlock'];
174	187
	188	+ $this->possibleLoop = [];
175	189	while ($block != -2) {
	190	+ $this->catchLoop($block);
176	191	$pos = $block * self::SMALL_BLOCK_SIZE;
177	192	$streamData .= substr($rootdata, $pos, self::SMALL_BLOCK_SIZE);
178	193
179	194	$block = self::getInt4d($this->smallBlockChain, $block * 4);
		@@ -194,9 +209,11 @@
194	209
195	210	/** @var int */
196	211	$block = $this->props[$stream]['startBlock'];
197	212
	213	+ $this->possibleLoop = [];
198	214	while ($block != -2) {
	215	+ $this->catchLoop($block);
199	216	$pos = ($block + 1) * self::BIG_BLOCK_SIZE;
200	217	$streamData .= substr($this->data, $pos, self::BIG_BLOCK_SIZE);
201	218	$block = self::getInt4d($this->bigBlockChain, $block * 4);
202	219	}
		@@ -214,9 +231,11 @@
214	231	private function readData(int $block): string
215	232	{
216	233	$data = '';
217	234
	235	+ $this->possibleLoop = [];
218	236	while ($block != -2) {
	237	+ $this->catchLoop($block);
219	238	$pos = ($block + 1) * self::BIG_BLOCK_SIZE;
220	239	$data .= substr($this->data, $pos, self::BIG_BLOCK_SIZE);
221	240	$block = self::getInt4d($this->bigBlockChain, $block * 4);
222	241	}