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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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