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| 1 | <?php |
| 2 | /** |
| 3 | * Base class for streaming media segment readers |
| 4 | * |
| 5 | * @file |
| 6 | * @ingroup HLS |
| 7 | */ |
| 8 | |
| 9 | namespace MediaWiki\TimedMediaHandler\HLS; |
| 10 | |
| 11 | use InvalidArgumentException; |
| 12 | use RuntimeException; |
| 13 | |
| 14 | /** |
| 15 | * Base class for reading/writing a media file with wrappers |
| 16 | * for exception handling and possible multi usage. |
| 17 | */ |
| 18 | class StreamReader { |
| 19 | /** |
| 20 | * @var resource |
| 21 | */ |
| 22 | protected $file; |
| 23 | |
| 24 | protected int $pos; |
| 25 | |
| 26 | /** |
| 27 | * @param resource $file |
| 28 | */ |
| 29 | public function __construct( $file ) { |
| 30 | if ( get_resource_type( $file ) !== 'stream' ) { |
| 31 | throw new InvalidArgumentException( 'Invalid file stream' ); |
| 32 | } |
| 33 | $this->file = $file; |
| 34 | $this->pos = $this->tell(); |
| 35 | } |
| 36 | |
| 37 | private function tell(): int { |
| 38 | return ftell( $this->file ); |
| 39 | } |
| 40 | |
| 41 | public function pos(): int { |
| 42 | return $this->pos; |
| 43 | } |
| 44 | |
| 45 | /** |
| 46 | * Seek to given absolute file position. |
| 47 | */ |
| 48 | public function seek( int $pos ): void { |
| 49 | $this->pos = $pos; |
| 50 | |
| 51 | if ( $this->pos === $this->tell() ) { |
| 52 | return; |
| 53 | } |
| 54 | $retval = fseek( $this->file, $this->pos, SEEK_SET ); |
| 55 | |
| 56 | if ( $retval < 0 ) { |
| 57 | throw new RuntimeException( "Failed to seek to $this->pos bytes" ); |
| 58 | } |
| 59 | } |
| 60 | |
| 61 | /** |
| 62 | * Read $len bytes or throw on EOF/short read. |
| 63 | * @throws ShortReadException on end of file |
| 64 | */ |
| 65 | public function read( int $len ): string { |
| 66 | $this->seek( $this->pos ); |
| 67 | $bytes = fread( $this->file, $len ); |
| 68 | if ( $bytes === false ) { |
| 69 | throw new RuntimeException( "Read error for $len bytes at $this->pos" ); |
| 70 | } |
| 71 | if ( strlen( $bytes ) < $len ) { |
| 72 | throw new ShortReadException( $bytes ); |
| 73 | } |
| 74 | $this->pos += strlen( $bytes ); |
| 75 | return $bytes; |
| 76 | } |
| 77 | |
| 78 | /** |
| 79 | * Write the given data to the stream. |
| 80 | */ |
| 81 | public function write( string $bytes ) { |
| 82 | $this->seek( $this->pos ); |
| 83 | $len = strlen( $bytes ); |
| 84 | $nbytes = fwrite( $this->file, $bytes ); |
| 85 | if ( $nbytes === false ) { |
| 86 | throw new RuntimeException( "Write error for $len bytes at $this->pos" ); |
| 87 | } |
| 88 | if ( $nbytes < $len ) { |
| 89 | throw new RuntimeException( "Short write; unexpected filesystem error" ); |
| 90 | } |
| 91 | $this->pos += $nbytes; |
| 92 | } |
| 93 | } |