126 lines
2.4 KiB
PHP
126 lines
2.4 KiB
PHP
<?php
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namespace App\Media;
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use Illuminate\Support\Facades\Log;
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abstract class Base
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{
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protected const record_size = 16384; // Limiting the maximum amount of data we read into memory
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/** Full path to the file */
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protected string $filename;
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protected int $filesize;
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protected ?string $type;
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private mixed $fh;
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private int $fp;
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public function __construct(string $filename,string $type)
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{
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Log::info(sprintf('Create a media type [%s] for [%s]',get_class($this),$filename));
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$this->filename = $filename;
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$this->filesize = filesize($filename);
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$this->type = $type;
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}
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/**
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* Enable getting values for keys in the response
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*
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* @param string $key
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* @return mixed|object
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* @throws \Exception
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*/
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public function __get(string $key): mixed
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{
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switch ($key) {
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case 'type':
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return $this->type;
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default:
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throw new \Exception('Unknown key: '.$key);
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}
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}
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protected function data(int $size=4096): string
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{
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// Quick validation
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if (($size ?: $this->size) > static::record_size)
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throw new \Exception(sprintf('Refusing to read [%d] which is more than %d of data',$size ?: $this->size,self::record_size));
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$data = '';
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if ($this->fopen()) {
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while ((! is_null($read=$this->fread())) && (strlen($data) <= ($size ?: $this->size)))
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$data .= $read;
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$this->fclose();
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}
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return $data;
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}
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protected function fclose(): bool
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{
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fclose($this->fh);
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unset($this->fh);
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return TRUE;
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}
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/**
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* Open the file and seek to the atom
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*
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* @return bool
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*/
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protected function fopen(): bool
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{
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$this->fh = fopen($this->filename,'r');
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fseek($this->fh,$this->offset);
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$this->fp = 0;
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return TRUE;
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}
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/**
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* Read the atom from the file
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*
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* @param int $size
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* @return string|NULL
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*/
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protected function fread(int $size=4096): ?string
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{
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if ($this->fp === $this->size)
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return NULL;
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if ($this->fp+$size > $this->size)
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$size = $this->size-$this->fp;
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$read = fread($this->fh,$size);
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$this->fp += $size;
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return $read;
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}
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protected function fseek(int $offset): int
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{
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$this->fp = $offset;
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return fseek($this->fh,$this->offset+$this->fp);
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}
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protected function ftell(): int
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{
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return ftell($this->fh);
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}
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protected function unpack(array $unpack=[]): string
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{
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return collect($unpack ?: static::unpack)->map(fn($v,$k)=>$v[0].$k)->join('/');
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}
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protected function unpack_size(array $unpack=[]): int
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{
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return collect($unpack ?: static::unpack)->map(fn($v,$k)=>$v[1])->sum();
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}
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} |