42 lines
823 B
PHP
42 lines
823 B
PHP
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<?php
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namespace App\Media\QuickTime\Atoms;
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// Movie sample data—media samples such as video frames and groups of audio samples.
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// Usually this data can be interpreted only by using the movie resource.
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use Illuminate\Support\Arr;
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use App\Media\QuickTime\Atom;
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class mdat extends Atom
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{
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/**
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* Calculate the signature of the data
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*
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* @param string $alg
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* @return string
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*/
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public function signature(string $alg='sha1'): string
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{
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if (! Arr::has($this->cache,'signature')) {
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if ($this->size) {
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$this->fopen();
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$hash = hash_init($alg);
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while (!is_null($read = $this->fread(16384)))
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hash_update($hash, $read);
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$this->fclose();
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$this->cache['signature'] = hash_final($hash);
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} else {
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$this->cache['signature'] = NULL;
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}
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}
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return $this->cache['signature'];
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}
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}
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