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GIF detection: Only check the first 6 bytes of the input (#1441)

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* Only check the first 6 bytes of the input to reduce memory usage and speed up the detection

* Update src/Drivers/AbstractDecoder.php

Co-authored-by: Oliver Vogel <oliver@olivervogel.com>

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Co-authored-by: Oliver Vogel <oliver@olivervogel.com>
This commit is contained in:
Nicos Panayides
2025-05-14 17:21:20 +03:00
committed by GitHub
parent ae61c580ae
commit 9659e761ca
1 changed files with 3 additions and 1 deletions
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4
src/Drivers/AbstractDecoder.php
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@@ -22,9 +22,11 @@ abstract class AbstractDecoder implements DecoderInterface
*/ */
protected function isGifFormat(string $input): bool protected function isGifFormat(string $input): bool
{ {
$head = substr($input, 0, 6);
return 1 === preg_match( return 1 === preg_match(
"/^47494638(37|39)61/", "/^47494638(37|39)61/",
strtoupper(substr(bin2hex($input), 0, 32)) strtoupper(bin2hex($head))
); );
} }