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<?php |
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namespace suda\framework\http\stream; |
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use SplFileObject; |
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use suda\framework\http\Stream; |
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/** |
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* 数据流 |
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*/ |
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class DataStream implements Stream |
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{ |
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/** |
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* 设置偏移 |
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* |
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* @var int |
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*/ |
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protected $offset = 0; |
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/** |
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* 设置长度 |
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* |
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* @var int|null |
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*/ |
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protected $length = null; |
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/** |
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* 读取快大小 |
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* |
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* @var integer |
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*/ |
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protected $blockSize = 8192; |
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/** |
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* 流描述 |
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* |
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* @var SplFileObject|string |
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*/ |
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protected $stream; |
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/** |
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* 输入文件流 |
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* |
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* @param SplFileObject|string $stream |
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* @param integer $offset |
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* @param integer|null $length |
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* @param integer $blockSize |
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*/ |
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public function __construct($stream, int $offset = 0, ?int $length = null, int $blockSize = 8192) |
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{ |
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$this->stream = $stream; |
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$this->offset = $offset; |
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$this->length = $length; |
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$this->blockSize = $blockSize; |
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} |
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/** |
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* 获取全部内容 |
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* |
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* @return string |
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*/ |
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public function __toString() |
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{ |
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\ob_start(); |
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$this->echo(); |
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return \ob_get_clean(); |
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} |
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/** |
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* 输出 |
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* |
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* @return void |
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*/ |
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public function echo() |
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{ |
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$remain = $this->length(); |
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$stream = $this->openStream(); |
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if ($stream->fseek($this->offset) === 0) { |
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// 持续链接则继续发送内容 |
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while ($stream->eof() === false && $remain > 0) { |
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$readLength = $remain >= $this->blockSize ? $this->blockSize : $remain; |
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$remain -= $readLength; |
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$data = $stream->fread($readLength); |
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echo $data; |
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} |
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} |
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} |
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/** |
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* 获取流长度 |
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* |
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* @return integer |
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*/ |
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public function length():int |
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{ |
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if ($this->length === null) { |
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$stream = $this->openStream(); |
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$stream->fseek(0, SEEK_END); |
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$this->length = $stream->ftell(); |
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} |
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return $this->length; |
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} |
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/** |
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* 获取流名称 |
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* |
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* @return string |
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*/ |
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public function getStreamName() { |
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if (is_string($this->stream)) { |
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return $this->stream; |
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} else { |
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return $this->stream->getPathname(); |
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} |
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} |
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protected function openStream(): SplFileObject |
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{ |
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if (is_string($this->stream)) { |
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return new SplFileObject($this->stream); |
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} else { |
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return $this->stream; |
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} |
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} |
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} |
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dxkite /
suda
