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<?php
namespace kcfinder;
/**
* FastImage - Because sometimes you just want the size!
* Based on the Ruby Implementation by Steven Sykes (https://github.com/sdsykes/fastimage)
*
* Copyright (c) 2012 Tom Moor
* Tom Moor, http://tommoor.com
*
* MIT Licensed
* @version 0.1
*/
class fastImage
{
private $strpos = 0;
private $str;
private $uri;
private $type;
private $handle;
public function __construct($uri = null)
{
if ($uri) $this->load($uri);
}
public function load($uri)
{
if ($this->handle) $this->close();
$this->uri = $uri;
// Joy - this is a fix for URLs missing "http:"
if ($uri[0] == '/' && $uri[1] == '/') {
$uri = 'http:' . $uri;
}
$this->handle = fopen(
$uri,
'r',
false,
stream_context_create(array(
'http'=> array('timeout' => 0.5),
))
);
}
public function isValid()
{
return empty($this->handle) ? false : true;
}
public function close()
{
if (is_resource($this->handle)) fclose($this->handle);
}
public function getSize()
{
$this->strpos = 0;
if ($this->getType())
{
return array_values($this->parseSize());
}
return false;
}
public function getType()
{
$this->strpos = 0;
if (!$this->type)
{
switch ($this->getChars(2))
{
case "BM":
return $this->type = 'bmp';
case "GI":
return $this->type = 'gif';
case chr(0xFF).chr(0xd8):
return $this->type = 'jpeg';
case chr(0x89).'P':
return $this->type = 'png';
default:
return false;
}
}
return $this->type;
}
private function parseSize()
{
$this->strpos = 0;
switch ($this->type)
{
case 'png':
return $this->parseSizeForPNG();
case 'gif':
return $this->parseSizeForGIF();
case 'bmp':
return $this->parseSizeForBMP();
case 'jpeg':
return $this->parseSizeForJPEG();
}
return null;
}
private function parseSizeForPNG()
{
$chars = $this->getChars(25);
return unpack("N*", substr($chars, 16, 8));
}
private function parseSizeForGIF()
{
$chars = $this->getChars(11);
return unpack("S*", substr($chars, 6, 4));
}
private function parseSizeForBMP()
{
$chars = $this->getChars(29);
$chars = substr($chars, 14, 14);
$type = unpack('C', $chars);
return (reset($type) == 40) ? unpack('L*', substr($chars, 4)) : unpack('L*', substr($chars, 4, 8));
}
private function parseSizeForJPEG()
{
$state = null;
$i = 0;
while (true)
{
switch ($state)
{
default:
$this->getChars(2);
$state = 'started';
break;
case 'started':
$b = $this->getByte();
if ($b === false) return false;
$state = $b == 0xFF ? 'sof' : 'started';
break;
case 'sof':
$b = $this->getByte();
if (in_array($b, range(0xe0, 0xef)))
{
$state = 'skipframe';
}
elseif (in_array($b, array_merge(range(0xC0,0xC3), range(0xC5,0xC7), range(0xC9,0xCB), range(0xCD,0xCF))))
{
$state = 'readsize';
}
elseif ($b == 0xFF)
{
$state = 'sof';
}
else
{
$state = 'skipframe';
}
break;
case 'skipframe':
$skip = $this->readInt($this->getChars(2)) - 2;
$state = 'doskip';
break;
case 'doskip':
$this->getChars($skip);
$state = 'started';
break;
case 'readsize':
$c = $this->getChars(7);
return array($this->readInt(substr($c, 5, 2)), $this->readInt(substr($c, 3, 2)));
}
}
}
private function getChars($n)
{
$response = null;
// do we need more data?
if ($this->strpos + $n -1 >= strlen($this->str))
{
$end = ($this->strpos + $n);
while (strlen($this->str) < $end && $response !== false)
{
// read more from the file handle
$need = $end - ftell($this->handle);
if ($response = fread($this->handle, $need))
{
$this->str .= $response;
}
else
{
return false;
}
}
}
$result = substr($this->str, $this->strpos, $n);
$this->strpos += $n;
return $result;
}
private function getByte()
{
$c = $this->getChars(1);
$b = unpack("C", $c);
return reset($b);
}
private function readInt($str)
{
$size = unpack("C*", $str);
return ($size[1] << 8) + $size[2];
}
public function __destruct()
{
$this->close();
}
}
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