Component-Builder/libraries/phpspreadsheet/vendor/maennchen/zipstream-php/guides/ContentLength.rst
Robot ce55b353ec
Release of v3.2.5-alpha2
Remove all backward compatibility issues, so JCB will not need the [Backward Compatibility] plugin to run. Added new import powers for custom import of spreadsheets. Move the setDocument and _prepareDocument above the display in the site view and custom admin view. Update the trashhelper layout to work in Joomla 5. Add AllowDynamicProperties (Joomla 4+5) to view class to allow Custom Dynamic Get methods to work without issues.
2024-10-08 00:31:55 +02:00

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Adding Content-Length header
=============
Adding a ``Content-Length`` header for ``ZipStream`` can be achieved by
using the options ``SIMULATION_STRICT`` or ``SIMULATION_LAX`` in the
``operationMode`` parameter.
In the ``SIMULATION_STRICT`` mode, ``ZipStream`` will not allow to calculate the
size based on reading the whole file. ``SIMULATION_LAX`` will read the whole
file if neccessary.
``SIMULATION_STRICT`` is therefore useful to make sure that the size can be
calculated efficiently.
.. code-block:: php
use ZipStream\OperationMode;
use ZipStream\ZipStream;
$zip = new ZipStream(
operationMode: OperationMode::SIMULATE_STRICT, // or SIMULATE_LAX
defaultEnableZeroHeader: false,
sendHttpHeaders: true,
outputStream: $stream,
);
// Normally add files
$zip->addFile('sample.txt', 'Sample String Data');
// Use addFileFromCallback and exactSize if you want to defer opening of
// the file resource
$zip->addFileFromCallback(
'sample.txt',
exactSize: 18,
callback: function () {
return fopen('...');
}
);
// Read resulting file size
$size = $zip->finish();
// Tell it to the browser
header('Content-Length: '. $size);
// Execute the Simulation and stream the actual zip to the client
$zip->executeSimulation();