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class-deflatetransformer.php
44 lines
| 1 | <?php |
| 2 | |
| 3 | namespace WordPress\ByteStream\ByteTransformer; |
| 4 | |
| 5 | use WordPress\ByteStream\ByteStreamException; |
| 6 | |
| 7 | /** |
| 8 | * A writer that deflates the bytes written. |
| 9 | */ |
| 10 | class DeflateTransformer implements ByteTransformer { |
| 11 | |
| 12 | private $deflate_handle; |
| 13 | |
| 14 | public function __construct( string $encoding = ZLIB_ENCODING_DEFLATE ) { |
| 15 | $this->deflate_handle = deflate_init( $encoding ); |
| 16 | if ( false === $this->deflate_handle ) { |
| 17 | throw new ByteStreamException( 'Failed to initialize deflate handle' ); |
| 18 | } |
| 19 | } |
| 20 | |
| 21 | public function filter_bytes( string $bytes ) { |
| 22 | if ( null === $this->deflate_handle ) { |
| 23 | throw new ByteStreamException( 'Deflate handle is not initialized' ); |
| 24 | } |
| 25 | |
| 26 | $chunk = deflate_add( $this->deflate_handle, $bytes, ZLIB_NO_FLUSH ); |
| 27 | if ( false === $chunk ) { |
| 28 | throw new ByteStreamException( 'Failed to deflate bytes' ); |
| 29 | } |
| 30 | |
| 31 | return $chunk; |
| 32 | } |
| 33 | |
| 34 | public function flush(): string { |
| 35 | if ( null === $this->deflate_handle ) { |
| 36 | throw new ByteStreamException( 'closing the deflate filter?' ); |
| 37 | } |
| 38 | $last_chunk = deflate_add( $this->deflate_handle, '', ZLIB_FINISH ); |
| 39 | $this->deflate_handle = null; |
| 40 | |
| 41 | return $last_chunk; |
| 42 | } |
| 43 | } |
| 44 |