Version 1

[yaffs-website] / vendor / guzzlehttp / psr7 / src / LimitStream.php

diff --git a/vendor/guzzlehttp/psr7/src/LimitStream.php b/vendor/guzzlehttp/psr7/src/LimitStream.php
new file mode 100644 (file)
index 0000000..3c13d4f
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+++ b/vendor/guzzlehttp/psr7/src/LimitStream.php
@@ -0,0 +1,155 @@
+<?php
+namespace GuzzleHttp\Psr7;
+
+use Psr\Http\Message\StreamInterface;
+
+
+/**
+ * Decorator used to return only a subset of a stream
+ */
+class LimitStream implements StreamInterface
+{
+    use StreamDecoratorTrait;
+
+    /** @var int Offset to start reading from */
+    private $offset;
+
+    /** @var int Limit the number of bytes that can be read */
+    private $limit;
+
+    /**
+     * @param StreamInterface $stream Stream to wrap
+     * @param int             $limit  Total number of bytes to allow to be read
+     *                                from the stream. Pass -1 for no limit.
+     * @param int             $offset Position to seek to before reading (only
+     *                                works on seekable streams).
+     */
+    public function __construct(
+        StreamInterface $stream,
+        $limit = -1,
+        $offset = 0
+    ) {
+        $this->stream = $stream;
+        $this->setLimit($limit);
+        $this->setOffset($offset);
+    }
+
+    public function eof()
+    {
+        // Always return true if the underlying stream is EOF
+        if ($this->stream->eof()) {
+            return true;
+        }
+
+        // No limit and the underlying stream is not at EOF
+        if ($this->limit == -1) {
+            return false;
+        }
+
+        return $this->stream->tell() >= $this->offset + $this->limit;
+    }
+
+    /**
+     * Returns the size of the limited subset of data
+     * {@inheritdoc}
+     */
+    public function getSize()
+    {
+        if (null === ($length = $this->stream->getSize())) {
+            return null;
+        } elseif ($this->limit == -1) {
+            return $length - $this->offset;
+        } else {
+            return min($this->limit, $length - $this->offset);
+        }
+    }
+
+    /**
+     * Allow for a bounded seek on the read limited stream
+     * {@inheritdoc}
+     */
+    public function seek($offset, $whence = SEEK_SET)
+    {
+        if ($whence !== SEEK_SET || $offset < 0) {
+            throw new \RuntimeException(sprintf(
+                'Cannot seek to offset % with whence %s',
+                $offset,
+                $whence
+            ));
+        }
+
+        $offset += $this->offset;
+
+        if ($this->limit !== -1) {
+            if ($offset > $this->offset + $this->limit) {
+                $offset = $this->offset + $this->limit;
+            }
+        }
+
+        $this->stream->seek($offset);
+    }
+
+    /**
+     * Give a relative tell()
+     * {@inheritdoc}
+     */
+    public function tell()
+    {
+        return $this->stream->tell() - $this->offset;
+    }
+
+    /**
+     * Set the offset to start limiting from
+     *
+     * @param int $offset Offset to seek to and begin byte limiting from
+     *
+     * @throws \RuntimeException if the stream cannot be seeked.
+     */
+    public function setOffset($offset)
+    {
+        $current = $this->stream->tell();
+
+        if ($current !== $offset) {
+            // If the stream cannot seek to the offset position, then read to it
+            if ($this->stream->isSeekable()) {
+                $this->stream->seek($offset);
+            } elseif ($current > $offset) {
+                throw new \RuntimeException("Could not seek to stream offset $offset");
+            } else {
+                $this->stream->read($offset - $current);
+            }
+        }
+
+        $this->offset = $offset;
+    }
+
+    /**
+     * Set the limit of bytes that the decorator allows to be read from the
+     * stream.
+     *
+     * @param int $limit Number of bytes to allow to be read from the stream.
+     *                   Use -1 for no limit.
+     */
+    public function setLimit($limit)
+    {
+        $this->limit = $limit;
+    }
+
+    public function read($length)
+    {
+        if ($this->limit == -1) {
+            return $this->stream->read($length);
+        }
+
+        // Check if the current position is less than the total allowed
+        // bytes + original offset
+        $remaining = ($this->offset + $this->limit) - $this->stream->tell();
+        if ($remaining > 0) {
+            // Only return the amount of requested data, ensuring that the byte
+            // limit is not exceeded
+            return $this->stream->read(min($remaining, $length));
+        }
+
+        return '';
+    }
+}