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Ability to strip excess data (commonly ZIP archives) from images.

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This commit is contained in:
Savetheinternet 2010-11-03 23:37:28 +11:00
parent f864d5df16
commit bb1abb85e1
3 changed files with 124 additions and 10 deletions
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9
inc/config.php
View File

@ -53,6 +53,15 @@
define('MAX_WIDTH', 10000);
define('MAX_HEIGHT', MAX_WIDTH);
/**
Redraw the image using GD functions to strip any excess data (commonly ZIP archives)
WARNING: Very beta. Currently strips animated GIFs too :(
**/
define('REDRAW_IMAGE', true);
// Redrawing configuration
define('JPEG_QUALITY', 100);
define('DIR_IMG', 'src/');
define('DIR_THUMB', 'thumb/');
define('DIR_RES', 'res/');

99
inc/functions.php
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@ -309,28 +309,28 @@
return $res;
}
function resize($type, $source_pic, $destination_pic, $max_width, $max_height) {
$return = Array();
function createimage($type, $source_pic) {
switch($type) {
case 'jpg':
case 'jpeg':
$src = imagecreatefromjpeg($source_pic);
return imagecreatefromjpeg($source_pic);
break;
case 'png':
$src = imagecreatefrompng($source_pic);
return imagecreatefrompng($source_pic);
break;
case 'gif':
$src = imagecreatefromgif($source_pic);
return imagecreatefromgif($source_pic);
break;
case 'bmp':
$src = imagecreatefrombmp($source_pic);
return imagecreatefrombmp($source_pic);
break;
default:
error('Unknwon file extension.');
}
list($width,$height)=getimagesize($source_pic);
}
function resize($src, $width, $height, $destination_pic, $max_width, $max_height) {
$return = Array();
$x_ratio = $max_width / $width;
$y_ratio = $max_height / $height;
@ -362,4 +362,85 @@
return $return;
}
function imagebmp(&$img, $filename=""){
$widthOrig = imagesx($img);
// width = 16*x
$widthFloor = ((floor($widthOrig/16))*16);
$widthCeil = ((ceil($widthOrig/16))*16);
$height = imagesy($img);
$size = ($widthCeil*$height*3)+54;
// Bitmap File Header
$result = 'BM'; // header (2b)
$result .= int_to_dword($size); // size of file (4b)
$result .= int_to_dword(0); // reserved (4b)
$result .= int_to_dword(54); // byte location in the file which is first byte of IMAGE (4b)
// Bitmap Info Header
$result .= int_to_dword(40); // Size of BITMAPINFOHEADER (4b)
$result .= int_to_dword($widthCeil); // width of bitmap (4b)
$result .= int_to_dword($height); // height of bitmap (4b)
$result .= int_to_word(1); // biPlanes = 1 (2b)
$result .= int_to_word(24); // biBitCount = {1 (mono) or 4 (16 clr ) or 8 (256 clr) or 24 (16 Mil)} (2b)
$result .= int_to_dword(0); // RLE COMPRESSION (4b)
$result .= int_to_dword(0); // width x height (4b)
$result .= int_to_dword(0); // biXPelsPerMeter (4b)
$result .= int_to_dword(0); // biYPelsPerMeter (4b)
$result .= int_to_dword(0); // Number of palettes used (4b)
$result .= int_to_dword(0); // Number of important colour (4b)
// is faster than chr()
$arrChr = array();
for($i=0; $i<256; $i++){
$arrChr[$i] = chr($i);
}
// creates image data
$bgfillcolor = array("red"=>0, "green"=>0, "blue"=>0);
// bottom to top - left to right - attention blue green red !!!
$y=$height-1;
for ($y2=0; $y2<$height; $y2++) {
for ($x=0; $x<$widthFloor; ) {
$rgb = imagecolorsforindex($img, imagecolorat($img, $x++, $y));
$result .= $arrChr[$rgb["blue"]].$arrChr[$rgb["green"]].$arrChr[$rgb["red"]];
$rgb = imagecolorsforindex($img, imagecolorat($img, $x++, $y));
$result .= $arrChr[$rgb["blue"]].$arrChr[$rgb["green"]].$arrChr[$rgb["red"]];
$rgb = imagecolorsforindex($img, imagecolorat($img, $x++, $y));
$result .= $arrChr[$rgb["blue"]].$arrChr[$rgb["green"]].$arrChr[$rgb["red"]];
$rgb = imagecolorsforindex($img, imagecolorat($img, $x++, $y));
$result .= $arrChr[$rgb["blue"]].$arrChr[$rgb["green"]].$arrChr[$rgb["red"]];
$rgb = imagecolorsforindex($img, imagecolorat($img, $x++, $y));
$result .= $arrChr[$rgb["blue"]].$arrChr[$rgb["green"]].$arrChr[$rgb["red"]];
$rgb = imagecolorsforindex($img, imagecolorat($img, $x++, $y));
$result .= $arrChr[$rgb["blue"]].$arrChr[$rgb["green"]].$arrChr[$rgb["red"]];
$rgb = imagecolorsforindex($img, imagecolorat($img, $x++, $y));
$result .= $arrChr[$rgb["blue"]].$arrChr[$rgb["green"]].$arrChr[$rgb["red"]];
$rgb = imagecolorsforindex($img, imagecolorat($img, $x++, $y));
$result .= $arrChr[$rgb["blue"]].$arrChr[$rgb["green"]].$arrChr[$rgb["red"]];
}
for ($x=$widthFloor; $x<$widthCeil; $x++) {
$rgb = ($x<$widthOrig) ? imagecolorsforindex($img, imagecolorat($img, $x, $y)) : $bgfillcolor;
$result .= $arrChr[$rgb["blue"]].$arrChr[$rgb["green"]].$arrChr[$rgb["red"]];
}
$y--;
}
// see imagegif
if($filename==""){
echo $result;
} else {
$file = fopen($filename, "wb");
fwrite($file, $result);
fclose($file);
}
}
// imagebmp helpers
function int_to_dword($n){
return chr($n & 255).chr(($n >> 8) & 255).chr(($n >> 16) & 255).chr(($n >> 24) & 255);
}
function int_to_word($n){
return chr($n & 255).chr(($n >> 8) & 255);
}
?>

26
post.php
View File

@ -130,8 +130,32 @@
$post['filehash'] = md5_file($post['file']);
$post['filesize'] = filesize($post['file']);
$image = createimage($post['extension'], $post['file']);
if(REDRAW_IMAGE) {
switch($post['extension']) {
case 'jpg':
case 'jpeg':
imagejpeg($image, $post['file'], JPEG_QUALITY);
break;
case 'png':
imagepng($image, $post['file'], 7);
break;
case 'gif':
imagegif($image, $post['file']);
break;
case 'bmp':
imagebmp($image, $post['file']);
break;
default:
error('Unknwon file extension.');
}
}
// Create a thumbnail
$thumb = resize($post['extension'], $post['file'], $post['thumb'], THUMB_WIDTH, THUMB_HEIGHT);
$thumb = resize($image, $post['width'], $post['height'], $post['thumb'], THUMB_WIDTH, THUMB_HEIGHT);
$post['thumbwidth'] = $thumb['width'];
$post['thumbheight'] = $thumb['height'];
}