TYPO3 Core

I'm not really sure if this is a bug or a feature.

When you enable compression for the backend (e.g. [BE][compressionLevel] = 9), then dumpFileContents in TYPO3\CMS\Core\Resource\ResourceStorage does dump the given filecontent gzip compressed. Actually I would have supposed, that dumpFileContents always should just dump the content of the file and don't care about compression.

The following code can be used in an action of a backend module to test the problem.

$storage = $this->resourceFactory->getDefaultStorage();
$file = $storage->getFile('test.jpg');
$storage->dumpFileContents($file, TRUE, 'test-filename.jpg');

The file "test-filename.jpg" gets dumped and is not readable, as it it compressed.

When showing fileinfo for the file, it shows

file test-filename.jpg
test-filename.jpg: gzip compressed data, from Unix, max compression

I could not reproduce this in frontend when setting [FE][compressionLevel] = 9, as the file in FE is not dumped at all (only a 0 bytes file is saved). Using [FE][compressionLevel] = 0 dumps the file correctly.