1 files changed, 174 insertions, 0 deletions
diff --git a/vendor/clue/utf8-react/src/Sequencer.php b/vendor/clue/utf8-react/src/Sequencer.php
new file mode 100644
index 0000000..e9bf433
--- /dev/null
+++ b/vendor/clue/utf8-react/src/Sequencer.php
@@ -0,0 +1,174 @@
+<?php
+
+namespace Clue\React\Utf8;
+
+use Evenement\EventEmitter;
+use React\Stream\ReadableStreamInterface;
+use React\Stream\WritableStreamInterface;
+use React\Stream\Util;
+
+/**
+ * forwards only complete UTF-8 sequences
+ */
+class Sequencer extends EventEmitter implements ReadableStreamInterface
+{
+    private $input;
+    private $invalid;
+
+    private $buffer = '';
+    private $closed = false;
+
+    public function __construct(ReadableStreamInterface $input, $replacementCharacter = '?')
+    {
+        $this->input = $input;
+        $this->invalid = $replacementCharacter;
+
+        if (!$input->isReadable()) {
+            return $this->close();
+        }
+
+        $this->input->on('data', array($this, 'handleData'));
+        $this->input->on('end', array($this, 'handleEnd'));
+        $this->input->on('error', array($this, 'handleError'));
+        $this->input->on('close', array($this, 'close'));
+    }
+
+    /** @internal */
+    public function handleData($data)
+    {
+        $this->buffer .= $data;
+        $len = strlen($this->buffer);
+
+        $sequence = '';
+        $expect = 0;
+        $out = '';
+
+        for ($i = 0; $i < $len; ++$i) {
+            $char = $this->buffer[$i];
+            $code = ord($char);
+
+            if ($code & 128) {
+                // multi-byte sequence
+                if ($code & 64) {
+                    // this is the start of a sequence
+
+                    // unexpected start of sequence because already within sequence
+                    if ($expect !== 0) {
+                        $out .= str_repeat($this->invalid, strlen($sequence));
+                        $sequence = '';
+                    }
+
+                    $sequence = $char;
+                    $expect = 2;
+
+                    if ($code & 32) {
+                        ++$expect;
+                        if ($code & 16) {
+                            ++$expect;
+
+                            if ($code & 8) {
+                                // invalid sequence start length
+                                $out .= $this->invalid;
+                                $sequence = '';
+                                $expect = 0;
+                            }
+                        }
+                    }
+                } else {
+                    // this is a follow-up byte in a sequence
+                    if ($expect === 0) {
+                        // we're not within a sequence in first place
+                        $out .= $this->invalid;
+                    } else {
+                        // valid following byte in sequence
+                        $sequence .= $char;
+
+                        // sequence reached expected length => add to output
+                        if (strlen($sequence) === $expect) {
+                            $out .= $sequence;
+                            $sequence = '';
+                            $expect = 0;
+                        }
+                    }
+                }
+            } else {
+                // simple ASCII character found
+
+                // unexpected because already within sequence
+                if ($expect !== 0) {
+                    $out .= str_repeat($this->invalid, strlen($sequence));
+                    $sequence = '';
+                    $expect = 0;
+                }
+
+                $out .= $char;
+            }
+        }
+
+        if ($out !== '') {
+            $this->buffer = substr($this->buffer, strlen($out));
+
+            $this->emit('data', array($out));
+        }
+    }
+
+    /** @internal */
+    public function handleEnd()
+    {
+        if ($this->buffer !== '' && $this->invalid !== '') {
+            $data = str_repeat($this->invalid, strlen($this->buffer));
+            $this->buffer = '';
+
+            $this->emit('data', array($data));
+        }
+
+        if (!$this->closed) {
+            $this->emit('end');
+            $this->close();
+        }
+    }
+
+    /** @internal */
+    public function handleError(\Exception $error)
+    {
+        $this->emit('error', array($error));
+        $this->close();
+    }
+
+    public function isReadable()
+    {
+        return !$this->closed && $this->input->isReadable();
+    }
+
+    public function close()
+    {
+        if ($this->closed) {
+            return;
+        }
+
+        $this->closed = true;
+        $this->buffer = '';
+
+        $this->input->close();
+
+        $this->emit('close');
+        $this->removeAllListeners();
+    }
+
+    public function pause()
+    {
+        $this->input->pause();
+    }
+
+    public function resume()
+    {
+        $this->input->resume();
+    }
+
+    public function pipe(WritableStreamInterface $dest, array $options = array())
+    {
+        Util::pipe($this, $dest, $options);
+
+        return $dest;
+    }
+}