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<?php
/**
* This file is part of the ZBateson\StreamDecorators project.
*
* @license http://opensource.org/licenses/bsd-license.php BSD
*/
namespace ZBateson\StreamDecorators;
use GuzzleHttp\Psr7\BufferStream;
use GuzzleHttp\Psr7\StreamDecoratorTrait;
use Psr\Http\Message\StreamInterface;
use RuntimeException;
/**
* GuzzleHttp\Psr7 stream decoder extension for UU-Encoded streams.
*
* The size of the underlying stream and the position of bytes can't be
* determined because the number of encoded bytes is indeterminate without
* reading the entire stream.
*
* @author Zaahid Bateson
*/
class UUStream implements StreamInterface
{
use StreamDecoratorTrait;
/**
* @var string name of the UUEncoded file
*/
protected $filename = null;
/**
* @var BufferStream of read and decoded bytes
*/
private $buffer;
/**
* @var string remainder of write operation if the bytes didn't align to 3
* bytes
*/
private $remainder = '';
/**
* @var int read/write position
*/
private $position = 0;
/**
* @var bool set to true when 'write' is called
*/
private $isWriting = false;
/**
* @var StreamInterface $stream
*/
private $stream;
/**
* @param StreamInterface $stream Stream to decorate
* @param string $filename optional file name
*/
public function __construct(StreamInterface $stream, ?string $filename = null)
{
$this->stream = $stream;
$this->filename = $filename;
$this->buffer = new BufferStream();
}
/**
* Overridden to return the position in the target encoding.
*/
public function tell() : int
{
return $this->position;
}
/**
* Returns null, getSize isn't supported
*
* @return null
*/
public function getSize() : ?int
{
return null;
}
/**
* Not supported.
*
* @param int $offset
* @param int $whence
* @throws RuntimeException
*/
public function seek($offset, $whence = SEEK_SET) : void
{
throw new RuntimeException('Cannot seek a UUStream');
}
/**
* Overridden to return false
*/
public function isSeekable() : bool
{
return false;
}
/**
* Finds the next end-of-line character to ensure a line isn't broken up
* while buffering.
*/
private function readToEndOfLine(int $length) : string
{
$str = $this->stream->read($length);
if ($str === '') {
return $str;
}
while (\substr($str, -1) !== "\n") {
$chr = $this->stream->read(1);
if ($chr === '') {
break;
}
$str .= $chr;
}
return $str;
}
/**
* Removes invalid characters from a uuencoded string, and 'BEGIN' and 'END'
* line headers and footers from the passed string before returning it.
*/
private function filterAndDecode(string $str) : string
{
$ret = \str_replace("\r", '', $str);
$ret = \preg_replace('/[^\x21-\xf5`\n]/', '`', $ret);
if ($this->position === 0) {
$matches = [];
if (\preg_match('/^\s*begin\s+[^\s+]\s+([^\r\n]+)\s*$/im', $ret, $matches)) {
$this->filename = $matches[1];
}
$ret = \preg_replace('/^\s*begin[^\r\n]+\s*$/im', '', $ret);
} else {
$ret = \preg_replace('/^\s*end\s*$/im', '', $ret);
}
return \convert_uudecode(\trim($ret));
}
/**
* Buffers bytes into $this->buffer, removing uuencoding headers and footers
* and decoding them.
*/
private function fillBuffer(int $length) : void
{
// 5040 = 63 * 80, seems to be good balance for buffering in benchmarks
// testing with a simple 'if ($length < x)' and calculating a better
// size reduces speeds by up to 4x
while ($this->buffer->getSize() < $length) {
$read = $this->readToEndOfLine(5040);
if ($read === '') {
break;
}
$this->buffer->write($this->filterAndDecode($read));
}
}
/**
* Returns true if the end of stream has been reached.
*/
public function eof() : bool
{
return ($this->buffer->eof() && $this->stream->eof());
}
/**
* Attempts to read $length bytes after decoding them, and returns them.
*
* @param int $length
*/
public function read($length) : string
{
// let Guzzle decide what to do.
if ($length <= 0 || $this->eof()) {
return $this->stream->read($length);
}
$this->fillBuffer($length);
$read = $this->buffer->read($length);
$this->position += \strlen($read);
return $read;
}
/**
* Writes the 'begin' UU header line.
*/
private function writeUUHeader() : void
{
$filename = (empty($this->filename)) ? 'null' : $this->filename;
$this->stream->write("begin 666 $filename");
}
/**
* Writes the '`' and 'end' UU footer lines.
*/
private function writeUUFooter() : void
{
$this->stream->write("\r\n`\r\nend\r\n");
}
/**
* Writes the passed bytes to the underlying stream after encoding them.
*/
private function writeEncoded(string $bytes) : void
{
$encoded = \preg_replace('/\r\n|\r|\n/', "\r\n", \rtrim(\convert_uuencode($bytes)));
// removes ending '`' line
$this->stream->write("\r\n" . \rtrim(\substr($encoded, 0, -1)));
}
/**
* Prepends any existing remainder to the passed string, then checks if the
* string fits into a uuencoded line, and removes and keeps any remainder
* from the string to write. Full lines ready for writing are returned.
*/
private function handleRemainder(string $string) : string
{
$write = $this->remainder . $string;
$nRem = \strlen($write) % 45;
$this->remainder = '';
if ($nRem !== 0) {
$this->remainder = \substr($write, -$nRem);
$write = \substr($write, 0, -$nRem);
}
return $write;
}
/**
* Writes the passed string to the underlying stream after encoding it.
*
* Note that reading and writing to the same stream without rewinding is not
* supported.
*
* Also note that some bytes may not be written until close or detach are
* called. This happens if written data doesn't align to a complete
* uuencoded 'line' of 45 bytes. In addition, the UU footer is only written
* when closing or detaching as well.
*
* @param string $string
* @return int the number of bytes written
*/
public function write($string) : int
{
$this->isWriting = true;
if ($this->position === 0) {
$this->writeUUHeader();
}
$write = $this->handleRemainder($string);
if ($write !== '') {
$this->writeEncoded($write);
}
$written = \strlen($string);
$this->position += $written;
return $written;
}
/**
* Returns the filename set in the UUEncoded header (or null)
*/
public function getFilename() : string
{
return $this->filename;
}
/**
* Sets the UUEncoded header file name written in the 'begin' header line.
*/
public function setFilename(string $filename) : void
{
$this->filename = $filename;
}
/**
* Writes out any remaining bytes and the UU footer.
*/
private function beforeClose() : void
{
if (!$this->isWriting) {
return;
}
if ($this->remainder !== '') {
$this->writeEncoded($this->remainder);
}
$this->remainder = '';
$this->isWriting = false;
$this->writeUUFooter();
}
/**
* @inheritDoc
*/
public function close() : void
{
$this->beforeClose();
$this->stream->close();
}
/**
* @inheritDoc
*/
public function detach()
{
$this->beforeClose();
$this->stream->detach();
return null;
}
}