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|
<?php
namespace Clue\React\Socks;
use React\Promise\Deferred;
use \InvalidArgumentException;
use \UnexpectedValueException;
/**
* @internal
*/
final class StreamReader
{
const RET_DONE = true;
const RET_INCOMPLETE = null;
private $buffer = '';
private $queue = array();
public function write($data)
{
$this->buffer .= $data;
do {
$current = reset($this->queue);
if ($current === false) {
break;
}
/* @var $current Closure */
$ret = $current($this->buffer);
if ($ret === self::RET_INCOMPLETE) {
// current is incomplete, so wait for further data to arrive
break;
} else {
// current is done, remove from list and continue with next
array_shift($this->queue);
}
} while (true);
}
public function readBinary($structure)
{
$length = 0;
$unpack = '';
foreach ($structure as $name=>$format) {
if ($length !== 0) {
$unpack .= '/';
}
$unpack .= $format . $name;
if ($format === 'C') {
++$length;
} else if ($format === 'n') {
$length += 2;
} else if ($format === 'N') {
$length += 4;
} else {
throw new InvalidArgumentException('Invalid format given');
}
}
return $this->readLength($length)->then(function ($response) use ($unpack) {
return unpack($unpack, $response);
});
}
public function readLength($bytes)
{
$deferred = new Deferred();
$this->readBufferCallback(function (&$buffer) use ($bytes, $deferred) {
if (strlen($buffer) >= $bytes) {
$deferred->resolve((string)substr($buffer, 0, $bytes));
$buffer = (string)substr($buffer, $bytes);
return StreamReader::RET_DONE;
}
});
return $deferred->promise();
}
public function readByte()
{
return $this->readBinary(array(
'byte' => 'C'
))->then(function ($data) {
return $data['byte'];
});
}
public function readByteAssert($expect)
{
return $this->readByte()->then(function ($byte) use ($expect) {
if ($byte !== $expect) {
throw new UnexpectedValueException('Unexpected byte encountered');
}
return $byte;
});
}
public function readStringNull()
{
$deferred = new Deferred();
$string = '';
$that = $this;
$readOne = function () use (&$readOne, $that, $deferred, &$string) {
$that->readByte()->then(function ($byte) use ($deferred, &$string, $readOne) {
if ($byte === 0x00) {
$deferred->resolve($string);
} else {
$string .= chr($byte);
$readOne();
}
});
};
$readOne();
return $deferred->promise();
}
public function readBufferCallback(/* callable */ $callable)
{
if (!is_callable($callable)) {
throw new InvalidArgumentException('Given function must be callable');
}
if ($this->queue) {
$this->queue []= $callable;
} else {
$this->queue = array($callable);
if ($this->buffer !== '') {
// this is the first element in the queue and the buffer is filled => trigger write procedure
$this->write('');
}
}
}
public function getBuffer()
{
return $this->buffer;
}
}
|
