Mega Code Archive
Database Image Size
<![CDATA[
<?
function dbimagesize($photo)
{
//Verify it is a JPEG file
if(ord($photo[0]) == 255 && ord($photo[1]) == 216 && ord($photo[2]) == 255 && ord($photo[3]) == 224)
{
//If it is a JPEG file then retieve it's width and height
$i = 4; //Skip the JPEG header
do
{
$offset = (ord($photo[$i]) << 8) + (ord($photo[$i+1]));
for($j=0;$j<$offset && $i<strlen($photo);$j++,$i++);
if(ord($photo[$i]) == 255 && (ord($photo[$i+1]) & 240) == 192)
break;
$i+=2;
}while($i<strlen($photo));
$i+=5;
$width = ((ord($photo[$i+2]) << 8) + ord($photo[$i+3]));
$height = ((ord($photo[$i]) << 8) + ord($photo[$i+1]));
$dimensions[] = $width;
$dimensions[] = $height;
return $dimensions;
}
//Verify it is a GIF file
if(strcmp(substr($photo,0,3),"GIF") == 0)
{
//if it is GIF file then retrieve it's width and height
$width = ((ord($photo[7]) << 8) + ord($photo[6]));
$height = ((ord($photo[9]) << 8) + ord($photo[8]));
$dimensions[] = $width;
$dimensions[] = $height;
return $dimensions;
}
//Verify it is a PNG file
if(ord($photo[0]) == 137 && ord($photo[1]) == 80 && ord($photo[2]) == 78 &&
ord($photo[3]) == 71 && ord($photo[4]) == 13 && ord($photo[5]) == 10 &&
ord($photo[6]) == 26 && ord($photo[7]) == 10)
{
//Since the beginning of file contains the proper sequence of bytes then
//we have a PNG file. The next steps are:
//
// 1. Next 4 bytes are the size of the IHDR, this seems to always be 00 00 00 0D, skip them
// 2. Since 13 (0D) is the size of the IHDR, get the next 4 bytes (IHDR), this is the
// type of header.
// 3. Now get the Width of Image given by the following 4 bytes.
// 4. Finally get the next 4 bytes to retrieve the Height of the image
//Ok, skip the first 8 bytes, 4 bytes of Chunk size and 4 bytes of Chunk type
//that means we must begin at array position 16 to get the Width of file.
$width = ((ord($photo[16]) << 24)+(ord($photo[17]) << 16)+(ord($photo[18]) << 8)+(ord($photo[19])));
$height = ((ord($photo[20]) << 24)+(ord($photo[21]) << 16)+(ord($photo[22]) << 8)+(ord($photo[23])));
$dimensions[] = $width;
$dimensions[] = $height;
return $dimensions;
}
return false;
}
function resize_dbimagesize($photo,$const_resize)
/*
This function is useful to get the images resized.
$const_resize --> Define the max size (width or heigth) of the image.
*/
{
//Verify it is a JPEG file
if(ord($photo[0]) == 255 && ord($photo[1]) == 216 && ord($photo[2]) == 255 && ord($photo[3]) == 224)
{
//If it is a JPEG file then retieve it's width and height
$i = 4; //Skip the JPEG header
do
{
$offset = (ord($photo[$i]) << 8) + (ord($photo[$i+1]));
for($j=0;$j<$offset && $i<strlen($photo);$j++,$i++);
if(ord($photo[$i]) == 255 && (ord($photo[$i+1]) & 240) == 192)
break;
$i+=2;
}while($i<strlen($photo));
$i+=5;
$width = ((ord($photo[$i+2]) << 8) + ord($photo[$i+3]));
$height = ((ord($photo[$i]) << 8) + ord($photo[$i+1]));
$dimensions[] = $width;
$dimensions[] = $height;
if ($dimensions[0]>=$dimensions[1]){
$dimensions[1]=$dimensions[1]/($dimensions[0]/$const_resize);
$dimensions[0]=$const_resize;}
else{
$dimensions[0]=$dimensions[0]/($dimensions[1]/$const_resize);
$dimensions[1]=$const_resize;
}
/* End Added Code */
return $dimensions;
}
//Verify it is a GIF file
if(strcmp(substr($photo,0,3),"GIF") == 0)
{
//if it is GIF file then retrieve it's width and height
$width = ((ord($photo[7]) << 8) + ord($photo[6]));
$height = ((ord($photo[9]) << 8) + ord($photo[8]));
$dimensions[] = $width;
$dimensions[] = $height;
if ($dimensions[0]>=$dimensions[1]){
$dimensions[1]=$dimensions[1]/($dimensions[0]/$const_resize);
$dimensions[0]=$const_resize;}
else{
$dimensions[0]=$dimensions[0]/($dimensions[1]/$const_resize);
$dimensions[1]=$const_resize;
}
/* End Added Code */
return $dimensions;
}
//Verify it is a PNG file
if(ord($photo[0]) == 137 && ord($photo[1]) == 80 && ord($photo[2]) == 78 &&
ord($photo[3]) == 71 && ord($photo[4]) == 13 && ord($photo[5]) == 10 &&
ord($photo[6]) == 26 && ord($photo[7]) == 10)
{
//Since the beginning of file contains the proper sequence of bytes then
//we have a PNG file. The next steps are:
//
// 1. Next 4 bytes are the size of the IHDR, this seems to always be 00 00 00 0D, skip them
// 2. Since 13 (0D) is the size of the IHDR, get the next 4 bytes (IHDR), this is the
// type of header.
// 3. Now get the Width of Image given by the following 4 bytes.
// 4. Finally get the next 4 bytes to retrieve the Height of the image
//Ok, skip the first 8 bytes, 4 bytes of Chunk size and 4 bytes of Chunk type
//that means we must begin at array position 16 to get the Width of file.
$width = ((ord($photo[16]) << 24)+(ord($photo[17]) << 16)+(ord($photo[18]) << 8)+(ord($photo[19])));
$height = ((ord($photo[20]) << 24)+(ord($photo[21]) << 16)+(ord($photo[22]) << 8)+(ord($photo[23])));
$dimensions[] = $width;
$dimensions[] = $height;
if ($dimensions[0]>=$dimensions[1]){
$dimensions[1]=$dimensions[1]/($dimensions[0]/$const_resize);
$dimensions[0]=$const_resize;}
else{
$dimensions[0]=$dimensions[0]/($dimensions[1]/$const_resize);
$dimensions[1]=$const_resize;
}
/* End Added Code */
return $dimensions;
}
return false;
}
?>
]]>