<?php
/*
* This file is part of SwiftMailer.
* (c) 2004-2009 Chris Corbyn
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
/**
* Allows reading and writing of bytes to and from an array.
*
* @author Chris Corbyn
*/
class Swift_ByteStream_ArrayByteStream implements Swift_InputByteStream, Swift_OutputByteStream
{
/**
* The internal stack of bytes.
*
* @var string[]
*/
private $array = [];
/**
* The size of the stack.
*
* @var int
*/
private $arraySize = 0;
/**
* The internal pointer offset.
*
* @var int
*/
private $offset = 0;
/**
* Bound streams.
*
* @var Swift_InputByteStream[]
*/
private $mirrors = [];
/**
* Create a new ArrayByteStream.
*
* If $stack is given the stream will be populated with the bytes it contains.
*
* @param mixed $stack of bytes in string or array form, optional
*/
public function __construct($stack = null)
{
if (\is_array($stack)) {
$this->array = $stack;
$this->arraySize = \count($stack);
} elseif (\is_string($stack)) {
$this->write($stack);
} else {
$this->array = [];
}
}
/**
* Reads $length bytes from the stream into a string and moves the pointer
* through the stream by $length.
*
* If less bytes exist than are requested the
* remaining bytes are given instead. If no bytes are remaining at all, boolean
* false is returned.
*
* @param int $length
*
* @return string
*/
public function read($length)
{
if ($this->offset == $this->arraySize) {
return false;
}
// Don't use array slice
$end = $length + $this->offset;
$end = $this->arraySize < $end ? $this->arraySize : $end;
$ret = '';
for (; $this->offset < $end; ++$this->offset) {
$ret .= $this->array[$this->offset];
}
return $ret;
}
/**
* Writes $bytes to the end of the stream.
*
* @param string $bytes
*/
public function write($bytes)
{
$to_add = str_split($bytes);
foreach ($to_add as $value) {
$this->array[] = $value;
}
$this->arraySize = \count($this->array);
foreach ($this->mirrors as $stream) {
$stream->write($bytes);
}
}
/**
* Not used.
*/
public function commit()
{
}
/**
* Attach $is to this stream.
*
* The stream acts as an observer, receiving all data that is written.
* All {@link write()} and {@link flushBuffers()} operations will be mirrored.
*/
public function bind(Swift_InputByteStream $is)
{
$this->mirrors[] = $is;
}
/**
* Remove an already bound stream.
*
* If $is is not bound, no errors will be raised.
* If the stream currently has any buffered data it will be written to $is
* before unbinding occurs.
*/
public function unbind(Swift_InputByteStream $is)
{
foreach ($this->mirrors as $k => $stream) {
if ($is === $stream) {
unset($this->mirrors[$k]);
}
}
}
/**
* Move the internal read pointer to $byteOffset in the stream.
*
* @param int $byteOffset
*
* @return bool
*/
public function setReadPointer($byteOffset)
{
if ($byteOffset > $this->arraySize) {
$byteOffset = $this->arraySize;
} elseif ($byteOffset < 0) {
$byteOffset = 0;
}
$this->offset = $byteOffset;
}
/**
* Flush the contents of the stream (empty it) and set the internal pointer
* to the beginning.
*/
public function flushBuffers()
{
$this->offset = 0;
$this->array = [];
$this->arraySize = 0;
foreach ($this->mirrors as $stream) {
$stream->flushBuffers();
}
}
}