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gnu-social/lib/imagefile.php

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<?php
/**
* StatusNet, the distributed open-source microblogging tool
*
* Abstraction for an image file
*
* PHP version 5
*
* LICENCE: This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* @category Image
* @package StatusNet
* @author Evan Prodromou <evan@status.net>
* @author Zach Copley <zach@status.net>
* @copyright 2008-2009 StatusNet, Inc.
* @license http://www.fsf.org/licensing/licenses/agpl-3.0.html GNU Affero General Public License version 3.0
* @link http://status.net/
*/
if (!defined('STATUSNET') && !defined('LACONICA')) {
exit(1);
}
/**
* A wrapper on uploaded files
*
* Makes it slightly easier to accept an image file from upload.
*
* @category Image
* @package StatusNet
* @author Evan Prodromou <evan@status.net>
* @author Zach Copley <zach@status.net>
* @license http://www.fsf.org/licensing/licenses/agpl-3.0.html GNU Affero General Public License version 3.0
* @link http://status.net/
*/
class ImageFile
{
var $id;
var $filepath;
var $barename;
var $type;
var $height;
var $width;
function __construct($id=null, $filepath=null, $type=null, $width=null, $height=null)
{
$this->id = $id;
$this->filepath = $filepath;
$info = @getimagesize($this->filepath);
if (!(
($info[2] == IMAGETYPE_GIF && function_exists('imagecreatefromgif')) ||
($info[2] == IMAGETYPE_JPEG && function_exists('imagecreatefromjpeg')) ||
$info[2] == IMAGETYPE_BMP ||
($info[2] == IMAGETYPE_WBMP && function_exists('imagecreatefromwbmp')) ||
($info[2] == IMAGETYPE_XBM && function_exists('imagecreatefromxbm')) ||
($info[2] == IMAGETYPE_PNG && function_exists('imagecreatefrompng')))) {
// TRANS: Exception thrown when trying to upload an unsupported image file format.
throw new Exception(_('Unsupported image file format.'));
return;
}
$this->type = ($info) ? $info[2]:$type;
$this->width = ($info) ? $info[0]:$width;
$this->height = ($info) ? $info[1]:$height;
}
static function fromUpload($param='upload')
{
switch ($_FILES[$param]['error']) {
case UPLOAD_ERR_OK: // success, jump out
break;
case UPLOAD_ERR_INI_SIZE:
case UPLOAD_ERR_FORM_SIZE:
// TRANS: Exception thrown when too large a file is uploaded.
// TRANS: %s is the maximum file size, for example "500b", "10kB" or "2MB".
throw new Exception(sprintf(_('That file is too big. The maximum file size is %s.'),
ImageFile::maxFileSize()));
return;
case UPLOAD_ERR_PARTIAL:
@unlink($_FILES[$param]['tmp_name']);
// TRANS: Exception thrown when uploading an image and that action could not be completed.
throw new Exception(_('Partial upload.'));
return;
case UPLOAD_ERR_NO_FILE:
// No file; probably just a non-AJAX submission.
return;
default:
common_log(LOG_ERR, __METHOD__ . ": Unknown upload error " .
$_FILES[$param]['error']);
// TRANS: Exception thrown when uploading an image fails for an unknown reason.
throw new Exception(_('System error uploading file.'));
return;
}
$info = @getimagesize($_FILES[$param]['tmp_name']);
if (!$info) {
@unlink($_FILES[$param]['tmp_name']);
// TRANS: Exception thrown when uploading a file as image that is not an image or is a corrupt file.
throw new Exception(_('Not an image or corrupt file.'));
return;
}
return new ImageFile(null, $_FILES[$param]['tmp_name']);
}
/**
* Compat interface for old code generating avatar thumbnails...
* Saves the scaled file directly into the avatar area.
*
* @param int $size target width & height -- must be square
* @param int $x (default 0) upper-left corner to crop from
* @param int $y (default 0) upper-left corner to crop from
* @param int $w (default full) width of image area to crop
* @param int $h (default full) height of image area to crop
* @return string filename
*/
function resize($size, $x = 0, $y = 0, $w = null, $h = null)
{
$targetType = $this->preferredType();
$outname = Avatar::filename($this->id,
image_type_to_extension($targetType),
$size,
common_timestamp());
$outpath = Avatar::path($outname);
$this->resizeTo($outpath, $size, $size, $x, $y, $w, $h);
return $outname;
}
/**
* Copy the image file to the given destination.
* For obscure formats, this will automatically convert to PNG;
* otherwise the original file will be copied as-is.
*
* @param string $outpath
* @return string filename
*/
function copyTo($outpath)
{
return $this->resizeTo($outpath, $this->width, $this->height);
}
/**
* Create and save a thumbnail image.
*
* @param string $outpath
* @param int $width target width
* @param int $height target height
* @param int $x (default 0) upper-left corner to crop from
* @param int $y (default 0) upper-left corner to crop from
* @param int $w (default full) width of image area to crop
* @param int $h (default full) height of image area to crop
* @return string full local filesystem filename
*/
function resizeTo($outpath, $width, $height, $x=0, $y=0, $w=null, $h=null)
{
$w = ($w === null) ? $this->width:$w;
$h = ($h === null) ? $this->height:$h;
$targetType = $this->preferredType();
if (!file_exists($this->filepath)) {
// TRANS: Exception thrown during resize when image has been registered as present, but is no longer there.
throw new Exception(_('Lost our file.'));
return;
}
// Don't crop/scale if it isn't necessary
if ($width === $this->width
&& $height === $this->height
&& $x === 0
&& $y === 0
&& $w === $this->width
&& $h === $this->height
&& $this->type == $targetType) {
@copy($this->filepath, $outpath);
return $outpath;
}
switch ($this->type) {
case IMAGETYPE_GIF:
$image_src = imagecreatefromgif($this->filepath);
break;
case IMAGETYPE_JPEG:
$image_src = imagecreatefromjpeg($this->filepath);
break;
case IMAGETYPE_PNG:
$image_src = imagecreatefrompng($this->filepath);
break;
case IMAGETYPE_BMP:
$image_src = imagecreatefrombmp($this->filepath);
break;
case IMAGETYPE_WBMP:
$image_src = imagecreatefromwbmp($this->filepath);
break;
case IMAGETYPE_XBM:
$image_src = imagecreatefromxbm($this->filepath);
break;
default:
// TRANS: Exception thrown when trying to resize an unknown file type.
throw new Exception(_('Unknown file type'));
return;
}
$image_dest = imagecreatetruecolor($width, $height);
if ($this->type == IMAGETYPE_GIF || $this->type == IMAGETYPE_PNG || $this->type == IMAGETYPE_BMP) {
$transparent_idx = imagecolortransparent($image_src);
if ($transparent_idx >= 0) {
$transparent_color = imagecolorsforindex($image_src, $transparent_idx);
$transparent_idx = imagecolorallocate($image_dest, $transparent_color['red'], $transparent_color['green'], $transparent_color['blue']);
imagefill($image_dest, 0, 0, $transparent_idx);
imagecolortransparent($image_dest, $transparent_idx);
} elseif ($this->type == IMAGETYPE_PNG) {
imagealphablending($image_dest, false);
$transparent = imagecolorallocatealpha($image_dest, 0, 0, 0, 127);
imagefill($image_dest, 0, 0, $transparent);
imagesavealpha($image_dest, true);
}
}
imagecopyresampled($image_dest, $image_src, 0, 0, $x, $y, $width, $height, $w, $h);
switch ($targetType) {
case IMAGETYPE_GIF:
imagegif($image_dest, $outpath);
break;
case IMAGETYPE_JPEG:
imagejpeg($image_dest, $outpath, common_config('image', 'jpegquality'));
break;
case IMAGETYPE_PNG:
imagepng($image_dest, $outpath);
break;
default:
// TRANS: Exception thrown when trying resize an unknown file type.
throw new Exception(_('Unknown file type'));
return;
}
imagedestroy($image_src);
imagedestroy($image_dest);
return $outpath;
}
/**
* Several obscure file types should be normalized to PNG on resize.
*
* @fixme consider flattening anything not GIF or JPEG to PNG
* @return int
*/
function preferredType()
{
if($this->type == IMAGETYPE_BMP) {
//we don't want to save BMP... it's an inefficient, rare, antiquated format
//save png instead
return IMAGETYPE_PNG;
} else if($this->type == IMAGETYPE_WBMP) {
//we don't want to save WBMP... it's a rare format that we can't guarantee clients will support
//save png instead
return IMAGETYPE_PNG;
} else if($this->type == IMAGETYPE_XBM) {
//we don't want to save XBM... it's a rare format that we can't guarantee clients will support
//save png instead
return IMAGETYPE_PNG;
}
return $this->type;
}
function unlink()
{
@unlink($this->filename);
}
static function maxFileSize()
{
$value = ImageFile::maxFileSizeInt();
if ($value > 1024 * 1024) {
$value = $value/(1024*1024);
// TRANS: Number of megabytes. %d is the number.
return sprintf(_m('%dMB','%dMB',$value),$value);
} else if ($value > 1024) {
$value = $value/1024;
// TRANS: Number of kilobytes. %d is the number.
return sprintf(_m('%dkB','%dkB',$value),$value);
} else {
// TRANS: Number of bytes. %d is the number.
return sprintf(_m('%dB','%dB',$value),$value);
}
}
static function maxFileSizeInt()
{
return min(ImageFile::strToInt(ini_get('post_max_size')),
ImageFile::strToInt(ini_get('upload_max_filesize')),
ImageFile::strToInt(ini_get('memory_limit')));
}
static function strToInt($str)
{
$unit = substr($str, -1);
$num = substr($str, 0, -1);
switch(strtoupper($unit)){
case 'G':
$num *= 1024;
case 'M':
$num *= 1024;
case 'K':
$num *= 1024;
}
return $num;
}
}
//PHP doesn't (as of 2/24/2010) have an imagecreatefrombmp so conditionally define one
if(!function_exists('imagecreatefrombmp')){
//taken shamelessly from http://www.php.net/manual/en/function.imagecreatefromwbmp.php#86214
function imagecreatefrombmp($p_sFile)
{
// Load the image into a string
$file = fopen($p_sFile,"rb");
$read = fread($file,10);
while(!feof($file)&&($read<>""))
$read .= fread($file,1024);
$temp = unpack("H*",$read);
$hex = $temp[1];
$header = substr($hex,0,108);
// Process the header
// Structure: http://www.fastgraph.com/help/bmp_header_format.html
if (substr($header,0,4)=="424d")
{
// Cut it in parts of 2 bytes
$header_parts = str_split($header,2);
// Get the width 4 bytes
$width = hexdec($header_parts[19].$header_parts[18]);
// Get the height 4 bytes
$height = hexdec($header_parts[23].$header_parts[22]);
// Unset the header params
unset($header_parts);
}
// Define starting X and Y
$x = 0;
$y = 1;
// Create newimage
$image = imagecreatetruecolor($width,$height);
// Grab the body from the image
$body = substr($hex,108);
// Calculate if padding at the end-line is needed
// Divided by two to keep overview.
// 1 byte = 2 HEX-chars
$body_size = (strlen($body)/2);
$header_size = ($width*$height);
// Use end-line padding? Only when needed
$usePadding = ($body_size>($header_size*3)+4);
// Using a for-loop with index-calculation instaid of str_split to avoid large memory consumption
// Calculate the next DWORD-position in the body
for ($i=0;$i<$body_size;$i+=3)
{
// Calculate line-ending and padding
if ($x>=$width)
{
// If padding needed, ignore image-padding
// Shift i to the ending of the current 32-bit-block
if ($usePadding)
$i += $width%4;
// Reset horizontal position
$x = 0;
// Raise the height-position (bottom-up)
$y++;
// Reached the image-height? Break the for-loop
if ($y>$height)
break;
}
// Calculation of the RGB-pixel (defined as BGR in image-data)
// Define $i_pos as absolute position in the body
$i_pos = $i*2;
$r = hexdec($body[$i_pos+4].$body[$i_pos+5]);
$g = hexdec($body[$i_pos+2].$body[$i_pos+3]);
$b = hexdec($body[$i_pos].$body[$i_pos+1]);
// Calculate and draw the pixel
$color = imagecolorallocate($image,$r,$g,$b);
imagesetpixel($image,$x,$height-$y,$color);
// Raise the horizontal position
$x++;
}
// Unset the body / free the memory
unset($body);
// Return image-object
return $image;
}
}
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