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<?php |
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|
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/** |
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* Copyright 2017 Google Inc. All Rights Reserved. |
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* |
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* Licensed under the Apache License, Version 2.0 (the "License"); |
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* you may not use this file except in compliance with the License. |
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* You may obtain a copy of the License at |
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* |
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* http://www.apache.org/licenses/LICENSE-2.0 |
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* |
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* Unless required by applicable law or agreed to in writing, software |
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* distributed under the License is distributed on an "AS IS" BASIS, |
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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* See the License for the specific language governing permissions and |
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* limitations under the License. |
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*/ |
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namespace Dudlewebs\WPMCS\Google\Cloud\Storage; |
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|
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use Dudlewebs\WPMCS\GuzzleHttp\Psr7\StreamDecoratorTrait; |
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use Dudlewebs\WPMCS\Psr\Http\Message\StreamInterface; |
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/** |
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* A Stream implementation that wraps a GuzzleHttp download stream to |
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* provide `getSize()` from the response headers. |
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*/ |
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class ReadStream implements StreamInterface |
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{ |
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use StreamDecoratorTrait; |
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private $stream; |
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/** |
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* Create a new ReadStream. |
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* |
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* @param StreamInterface $stream The stream interface to wrap |
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*/ |
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public function __construct(StreamInterface $stream) |
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{ |
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$this->stream = $stream; |
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} |
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/** |
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* Return the full size of the buffer. If the underlying stream does |
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* not report it's size, try to fetch the size from the Content-Length |
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* response header. |
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* |
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* @return int The size of the stream. |
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*/ |
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public function getSize(): ?int |
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{ |
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return $this->stream->getSize() ?: $this->getSizeFromMetadata(); |
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} |
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/** |
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* Attempt to fetch the size from the Content-Length response header. |
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* If we cannot, return 0. |
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* |
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* @return int The Size of the stream |
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*/ |
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private function getSizeFromMetadata(): int |
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{ |
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foreach ($this->stream->getMetadata('wrapper_data') as $value) { |
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if (substr($value, 0, 15) == "Content-Length:") { |
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return (int) substr($value, 16); |
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} |
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} |
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return 0; |
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} |
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/** |
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* Read bytes from the underlying buffer, retrying until we have read |
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* enough bytes or we cannot read any more. We do this because the |
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* internal C code for filling a buffer does not account for when |
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* we try to read large chunks from a user-land stream that does not |
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* return enough bytes. |
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* |
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* @param int $length The number of bytes to read. |
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* @return string Read bytes from the underlying stream. |
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*/ |
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public function read($length): string |
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{ |
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$data = ''; |
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do { |
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$moreData = $this->stream->read($length); |
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$data .= $moreData; |
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$readLength = strlen($moreData); |
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$length -= $readLength; |
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} while ($length > 0 && $readLength > 0); |
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return $data; |
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} |
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} |
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