GetImageSize ?

[Anon]

Hello,

I've been playing around with some functions that deal with graphic handling. I discovered that the GetImageSize will only work if the image exists in the current directory, ideally I wanted to access images from different directories and/or servers. Is this possible, could the configuration of this function be changed?

The program I'm building is for comicstrip syndication on the web. These are for members who want to provide easy updatable syndication of their strips on other websites without having to worry about loading the image originally as something like ie. todaystrip.gif and renaming it to something strip_093000.gif the next day. So basically they are calling it as if it is an image source from my site, and I pass it through an image header. I just wanted to set the image size when they first signed up, so I can configure the img src with the proper dimensions.

Thanks

Ron

[bentman]

this works to get the image dimensions remotely.
🙂ben

<? #################################################

GetURLImageSize( $urlpic ) determines the

dimensions of local/remote URL pictures.

returns array with ( $width,$height,$type )

##

Thanks to: Oyvind Hallsteinsen aka Gosub / ELq - [e-mail]

for the original size determining code

##

PHP Hack by Filipe Laborde-Basto Oct 21/2000

FREELY DISTRIBUTABLE -- use at your sole discretion! 🙂 Enjoy.

(Not to be sold in commercial packages though, keep it free!)

Feel free to contact me at [e-mail] (http://www.rezox.com)

#################################################

define(GIF_SIG, "\x47\x49\x46");
define(JPG_SIG, "\xff\xd8\xff");
define(PNG_SIG, "\x89\x50\x4e\x47\x0d\x0a\x1a\x0a");
define(JPG_SOF0, "\xc0"); / Start Of Frame N /
define(JPG_SOF1, "\xc1"); / N indicates which compression process /
define(JPG_SOF2, "\xc2"); / Only SOF0-SOF2 are now in common use /
define(JPG_SOF3, "\xc3");
define(JPG_SOF5, "\xc5"); / NB: codes C4 and CC are NOT SOF markers /
define(JPG_SOF6, "\xc6");
define(JPG_SOF7, "\xc7");
define(JPG_SOF9, "\xc9");
define(JPG_SOF10, "\xca");
define(JPG_SOF11, "\xcb");
define(JPG_SOF13, "\xcd");
define(JPG_SOF14, "\xce");
define(JPG_SOF15, "\xcf");
define(JPG_EOI, "\xd9"); / End Of Image (end of datastream) /
define(JPG_SOS, "\xda"); / Start Of Scan - image data start /
define(RD_BUF, 512); / amount of data to initially read /

function GetURLImageSize( $urlpic ){
$fd= @fopen($urlpic,"r");
if($fd){
#read in 1k, enough for GIF,PNG.
#continue to read from file, if the JPG chunk exceeds this
$imgData = fread( $fd,RD_BUF );

  if( substr($imgData,0,3)==GIF_SIG ){
     $dim =unpack ("v2dim",substr($imgData,6,4) );
     $width=$dim["dim1"]; $height=$dim["dim2"];
     $type = 1;
  } elseif( substr($imgData,0,8)==PNG_SIG ){
     $dim =unpack ("N2dim",substr($imgData,16,8) );
     $width=$dim["dim1"]; $height=$dim["dim2"];     
     $type = 3;
  } elseif( substr($imgData,0,3)==JPG_SIG ){
     ################# JPG CHUNK SCAN ####################
     $imgPos = 2; $type = 2; $buffer = RD_BUF-2;
     while($imgPos < strlen($imgData)) {
        /* synchronize to the marker 0xFF */
        $imgPos=strpos(&$imgData,0xFF,$imgPos)+1;
        $marker = $imgData[$imgPos];
        do { $marker = ord($imgData[$imgPos++]); } while ($marker == 255);
        /* find dimensions of block */
        switch (chr($marker)) {
          /* Grab width/height from SOF segment (these are acceptable chunk types) */
          case JPG_SOF0:  case JPG_SOF1:  case JPG_SOF2:
          case JPG_SOF3:  case JPG_SOF5:  case JPG_SOF6:
          case JPG_SOF7:  case JPG_SOF9:  case JPG_SOF10:
          case JPG_SOF11: case JPG_SOF12: case JPG_SOF13:
          case JPG_SOF14: case JPG_SOF15:    
          $dim =unpack ("n2dim",substr($imgData,$imgPos+3,4) );
          $height=$dim["dim1"]; $width=$dim["dim2"];
          break 2; //found it so exit
        case JPG_EOI:
        case JPG_SOS:
          return FALSE;   /* End loop in case we find one of these markers */
        default:            /* We're not interested in other markers */
          $skiplen = (ord($imgData[$imgPos++])<<8)+ord($imgData[$imgPos++])-2;
          /* if the skip is more than what we've read in, read more */
          $buffer -= $skiplen;
          if( $buffer<512 ){ #if the buffer of data is too low,read more file.
              $imgData .= fread( $fd,$skiplen+1024 );
              $buffer += $skiplen+1024;
          };
          $imgPos += $skiplen;
          break;
        }; //endif check marker type
     }; //endif loop through JPG chunks
  }; //endif chk for valid file types

  # got the pic dimensions, close the file
  fclose ($fd);       return array( $width,$height,$type );
} else {
  return array( '','','' );
}; //endif valid file pointer chk

}; // end function

?>