79 lines
2.3 KiB
ReStructuredText
79 lines
2.3 KiB
ReStructuredText
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Adding Content-Length header
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=============
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Adding a ``Content-Length`` header for ``ZipStream`` is not trivial since the
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size is not known beforehand.
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The following workaround adds an approximated header:
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.. code-block:: php
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class Zip
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{
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/** @var string */
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private $name;
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private $files = [];
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public function __construct($name)
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{
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$this->name = $name;
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}
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public function addFile($name, $data)
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{
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$this->files[] = ['type' => 'addFile', 'name' => $name, 'data' => $data];
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}
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public function addFileFromPath($name, $path)
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{
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$this->files[] = ['type' => 'addFileFromPath', 'name' => $name, 'path' => $path];
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}
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public function getEstimate()
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{
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$estimate = 22;
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foreach ($this->files as $file) {
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$estimate += 76 + 2 * strlen($file['name']);
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if ($file['type'] === 'addFile') {
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$estimate += strlen($file['data']);
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}
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if ($file['type'] === 'addFileFromPath') {
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$estimate += filesize($file['path']);
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}
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}
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return $estimate;
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}
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public function finish()
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{
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header('Content-Length: ' . $this->getEstimate());
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$options = new \ZipStream\Option\Archive();
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$options->setSendHttpHeaders(true);
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$options->setEnableZip64(false);
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$options->setDeflateLevel(-1);
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$zip = new \ZipStream\ZipStream($this->name, $options);
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$fileOptions = new \ZipStream\Option\File();
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$fileOptions->setMethod(\ZipStream\Option\Method::STORE());
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foreach ($this->files as $file) {
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if ($file['type'] === 'addFile') {
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$zip->addFile($file['name'], $file['data'], $fileOptions);
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}
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if ($file['type'] === 'addFileFromPath') {
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$zip->addFileFromPath($file['name'], $file['path'], $fileOptions);
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}
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}
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$zip->finish();
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exit;
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}
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}
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It only works with the following constraints:
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- All file content is known beforehand.
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- Content Deflation is disabled
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Thanks to
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`partiellkorrekt <https://github.com/maennchen/ZipStream-PHP/issues/89#issuecomment-1047949274>`_
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for this workaround.
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