52 lines
1.8 KiB
PHP
52 lines
1.8 KiB
PHP
<?php
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namespace WP_Ultimo\Dependencies\Amp\ByteStream\Base64;
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use WP_Ultimo\Dependencies\Amp\ByteStream\InputStream;
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use WP_Ultimo\Dependencies\Amp\ByteStream\StreamException;
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use WP_Ultimo\Dependencies\Amp\Promise;
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use function WP_Ultimo\Dependencies\Amp\call;
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final class Base64DecodingInputStream implements InputStream
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{
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/** @var InputStream|null */
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private $source;
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/** @var string|null */
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private $buffer = '';
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public function __construct(InputStream $source)
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{
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$this->source = $source;
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}
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public function read() : Promise
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{
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return call(function () {
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if ($this->source === null) {
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throw new StreamException('Failed to read stream chunk due to invalid base64 data');
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}
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$chunk = (yield $this->source->read());
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if ($chunk === null) {
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if ($this->buffer === null) {
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return null;
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}
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$chunk = \base64_decode($this->buffer, \true);
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if ($chunk === \false) {
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$this->source = null;
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$this->buffer = null;
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throw new StreamException('Failed to read stream chunk due to invalid base64 data');
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}
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$this->buffer = null;
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return $chunk;
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}
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$this->buffer .= $chunk;
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$length = \strlen($this->buffer);
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$chunk = \base64_decode(\substr($this->buffer, 0, $length - $length % 4), \true);
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if ($chunk === \false) {
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$this->source = null;
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$this->buffer = null;
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throw new StreamException('Failed to read stream chunk due to invalid base64 data');
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}
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$this->buffer = \substr($this->buffer, $length - $length % 4);
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return $chunk;
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});
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}
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}
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