435 lines
15 KiB
PHP
435 lines
15 KiB
PHP
<?php
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/**
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* StatusNet, the distributed open-source microblogging tool
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*
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* Abstraction for an image file
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*
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* PHP version 5
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*
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* LICENCE: This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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* @category Image
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* @package StatusNet
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* @author Evan Prodromou <evan@status.net>
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* @author Zach Copley <zach@status.net>
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* @copyright 2008-2009 StatusNet, Inc.
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* @license http://www.fsf.org/licensing/licenses/agpl-3.0.html GNU Affero General Public License version 3.0
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* @link http://status.net/
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*/
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if (!defined('STATUSNET') && !defined('LACONICA')) {
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exit(1);
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}
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/**
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* A wrapper on uploaded files
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*
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* Makes it slightly easier to accept an image file from upload.
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*
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* @category Image
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* @package StatusNet
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* @author Evan Prodromou <evan@status.net>
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* @author Zach Copley <zach@status.net>
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* @license http://www.fsf.org/licensing/licenses/agpl-3.0.html GNU Affero General Public License version 3.0
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* @link http://status.net/
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*/
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class ImageFile
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{
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var $id;
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var $filepath;
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var $barename;
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var $type;
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var $height;
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var $width;
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function __construct($id=null, $filepath=null, $type=null, $width=null, $height=null)
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{
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$this->id = $id;
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$this->filepath = $filepath;
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$info = @getimagesize($this->filepath);
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if (!(
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($info[2] == IMAGETYPE_GIF && function_exists('imagecreatefromgif')) ||
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($info[2] == IMAGETYPE_JPEG && function_exists('imagecreatefromjpeg')) ||
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$info[2] == IMAGETYPE_BMP ||
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($info[2] == IMAGETYPE_WBMP && function_exists('imagecreatefromwbmp')) ||
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($info[2] == IMAGETYPE_XBM && function_exists('imagecreatefromxbm')) ||
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($info[2] == IMAGETYPE_PNG && function_exists('imagecreatefrompng')))) {
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// TRANS: Exception thrown when trying to upload an unsupported image file format.
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throw new Exception(_('Unsupported image file format.'));
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return;
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}
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$this->type = ($info) ? $info[2]:$type;
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$this->width = ($info) ? $info[0]:$width;
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$this->height = ($info) ? $info[1]:$height;
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}
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static function fromUpload($param='upload')
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{
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switch ($_FILES[$param]['error']) {
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case UPLOAD_ERR_OK: // success, jump out
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break;
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case UPLOAD_ERR_INI_SIZE:
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case UPLOAD_ERR_FORM_SIZE:
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// TRANS: Exception thrown when too large a file is uploaded.
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// TRANS: %s is the maximum file size, for example "500b", "10kB" or "2MB".
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throw new Exception(sprintf(_('That file is too big. The maximum file size is %s.'),
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ImageFile::maxFileSize()));
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return;
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case UPLOAD_ERR_PARTIAL:
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@unlink($_FILES[$param]['tmp_name']);
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// TRANS: Exception thrown when uploading an image and that action could not be completed.
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throw new Exception(_('Partial upload.'));
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return;
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case UPLOAD_ERR_NO_FILE:
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// No file; probably just a non-AJAX submission.
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return;
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default:
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common_log(LOG_ERR, __METHOD__ . ": Unknown upload error " .
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$_FILES[$param]['error']);
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// TRANS: Exception thrown when uploading an image fails for an unknown reason.
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throw new Exception(_('System error uploading file.'));
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return;
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}
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$info = @getimagesize($_FILES[$param]['tmp_name']);
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if (!$info) {
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@unlink($_FILES[$param]['tmp_name']);
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// TRANS: Exception thrown when uploading a file as image that is not an image or is a corrupt file.
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throw new Exception(_('Not an image or corrupt file.'));
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return;
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}
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return new ImageFile(null, $_FILES[$param]['tmp_name']);
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}
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/**
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* Compat interface for old code generating avatar thumbnails...
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* Saves the scaled file directly into the avatar area.
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*
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* @param int $size target width & height -- must be square
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* @param int $x (default 0) upper-left corner to crop from
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* @param int $y (default 0) upper-left corner to crop from
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* @param int $w (default full) width of image area to crop
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* @param int $h (default full) height of image area to crop
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* @return string filename
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*/
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function resize($size, $x = 0, $y = 0, $w = null, $h = null)
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{
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$targetType = $this->preferredType();
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$outname = Avatar::filename($this->id,
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image_type_to_extension($targetType),
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$size,
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common_timestamp());
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$outpath = Avatar::path($outname);
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$this->resizeTo($outpath, $size, $size, $x, $y, $w, $h);
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return $outname;
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}
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/**
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* Copy the image file to the given destination.
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* For obscure formats, this will automatically convert to PNG;
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* otherwise the original file will be copied as-is.
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*
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* @param string $outpath
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* @return string filename
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*/
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function copyTo($outpath)
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{
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return $this->resizeTo($outpath, $this->width, $this->height);
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}
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/**
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* Create and save a thumbnail image.
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*
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* @param string $outpath
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* @param int $width target width
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* @param int $height target height
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* @param int $x (default 0) upper-left corner to crop from
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* @param int $y (default 0) upper-left corner to crop from
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* @param int $w (default full) width of image area to crop
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* @param int $h (default full) height of image area to crop
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* @return string full local filesystem filename
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*/
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function resizeTo($outpath, $width, $height, $x=0, $y=0, $w=null, $h=null)
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{
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$w = ($w === null) ? $this->width:$w;
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$h = ($h === null) ? $this->height:$h;
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$targetType = $this->preferredType();
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if (!file_exists($this->filepath)) {
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// TRANS: Exception thrown during resize when image has been registered as present, but is no longer there.
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throw new Exception(_('Lost our file.'));
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return;
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}
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// Don't crop/scale if it isn't necessary
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if ($width === $this->width
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&& $height === $this->height
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&& $x === 0
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&& $y === 0
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&& $w === $this->width
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&& $h === $this->height
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&& $this->type == $targetType) {
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@copy($this->filepath, $outpath);
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return $outpath;
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}
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switch ($this->type) {
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case IMAGETYPE_GIF:
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$image_src = imagecreatefromgif($this->filepath);
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break;
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case IMAGETYPE_JPEG:
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$image_src = imagecreatefromjpeg($this->filepath);
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break;
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case IMAGETYPE_PNG:
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$image_src = imagecreatefrompng($this->filepath);
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break;
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case IMAGETYPE_BMP:
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$image_src = imagecreatefrombmp($this->filepath);
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break;
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case IMAGETYPE_WBMP:
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$image_src = imagecreatefromwbmp($this->filepath);
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break;
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case IMAGETYPE_XBM:
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$image_src = imagecreatefromxbm($this->filepath);
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break;
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default:
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// TRANS: Exception thrown when trying to resize an unknown file type.
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throw new Exception(_('Unknown file type'));
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return;
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}
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$image_dest = imagecreatetruecolor($width, $height);
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if ($this->type == IMAGETYPE_GIF || $this->type == IMAGETYPE_PNG || $this->type == IMAGETYPE_BMP) {
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$transparent_idx = imagecolortransparent($image_src);
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if ($transparent_idx >= 0) {
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$transparent_color = imagecolorsforindex($image_src, $transparent_idx);
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$transparent_idx = imagecolorallocate($image_dest, $transparent_color['red'], $transparent_color['green'], $transparent_color['blue']);
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imagefill($image_dest, 0, 0, $transparent_idx);
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imagecolortransparent($image_dest, $transparent_idx);
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} elseif ($this->type == IMAGETYPE_PNG) {
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imagealphablending($image_dest, false);
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$transparent = imagecolorallocatealpha($image_dest, 0, 0, 0, 127);
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imagefill($image_dest, 0, 0, $transparent);
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imagesavealpha($image_dest, true);
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}
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}
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imagecopyresampled($image_dest, $image_src, 0, 0, $x, $y, $width, $height, $w, $h);
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switch ($targetType) {
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case IMAGETYPE_GIF:
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imagegif($image_dest, $outpath);
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break;
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case IMAGETYPE_JPEG:
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imagejpeg($image_dest, $outpath, 100);
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break;
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case IMAGETYPE_PNG:
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imagepng($image_dest, $outpath);
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break;
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default:
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// TRANS: Exception thrown when trying resize an unknown file type.
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throw new Exception(_('Unknown file type'));
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return;
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}
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imagedestroy($image_src);
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imagedestroy($image_dest);
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return $outpath;
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}
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/**
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* Several obscure file types should be normalized to PNG on resize.
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*
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* @fixme consider flattening anything not GIF or JPEG to PNG
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* @return int
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*/
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function preferredType()
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{
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if($this->type == IMAGETYPE_BMP) {
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//we don't want to save BMP... it's an inefficient, rare, antiquated format
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//save png instead
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return IMAGETYPE_PNG;
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} else if($this->type == IMAGETYPE_WBMP) {
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//we don't want to save WBMP... it's a rare format that we can't guarantee clients will support
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//save png instead
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return IMAGETYPE_PNG;
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} else if($this->type == IMAGETYPE_XBM) {
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//we don't want to save XBM... it's a rare format that we can't guarantee clients will support
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//save png instead
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return IMAGETYPE_PNG;
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}
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return $this->type;
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}
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function unlink()
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{
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@unlink($this->filename);
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}
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static function maxFileSize()
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{
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$value = ImageFile::maxFileSizeInt();
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if ($value > 1024 * 1024) {
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$value = $value/(1024*1024);
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// TRANS: Number of megabytes. %d is the number.
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return sprintf(_m('%dMB','%dMB',$value),$value);
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} else if ($value > 1024) {
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$value = $value/1024;
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// TRANS: Number of kilobytes. %d is the number.
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return sprintf(_m('%dkB','%dkB',$value),$value);
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} else {
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// TRANS: Number of bytes. %d is the number.
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return sprintf(_m('%dB','%dB',$value),$value);
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}
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}
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static function maxFileSizeInt()
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{
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return min(ImageFile::strToInt(ini_get('post_max_size')),
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ImageFile::strToInt(ini_get('upload_max_filesize')),
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ImageFile::strToInt(ini_get('memory_limit')));
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}
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static function strToInt($str)
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{
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$unit = substr($str, -1);
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$num = substr($str, 0, -1);
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switch(strtoupper($unit)){
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case 'G':
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$num *= 1024;
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case 'M':
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$num *= 1024;
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case 'K':
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$num *= 1024;
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}
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return $num;
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}
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}
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//PHP doesn't (as of 2/24/2010) have an imagecreatefrombmp so conditionally define one
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if(!function_exists('imagecreatefrombmp')){
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//taken shamelessly from http://www.php.net/manual/en/function.imagecreatefromwbmp.php#86214
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function imagecreatefrombmp($p_sFile)
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{
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// Load the image into a string
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$file = fopen($p_sFile,"rb");
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$read = fread($file,10);
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while(!feof($file)&&($read<>""))
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$read .= fread($file,1024);
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$temp = unpack("H*",$read);
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$hex = $temp[1];
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$header = substr($hex,0,108);
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// Process the header
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// Structure: http://www.fastgraph.com/help/bmp_header_format.html
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if (substr($header,0,4)=="424d")
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{
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// Cut it in parts of 2 bytes
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$header_parts = str_split($header,2);
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// Get the width 4 bytes
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$width = hexdec($header_parts[19].$header_parts[18]);
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// Get the height 4 bytes
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$height = hexdec($header_parts[23].$header_parts[22]);
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// Unset the header params
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unset($header_parts);
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}
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// Define starting X and Y
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$x = 0;
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$y = 1;
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// Create newimage
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$image = imagecreatetruecolor($width,$height);
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// Grab the body from the image
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$body = substr($hex,108);
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// Calculate if padding at the end-line is needed
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// Divided by two to keep overview.
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// 1 byte = 2 HEX-chars
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$body_size = (strlen($body)/2);
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$header_size = ($width*$height);
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// Use end-line padding? Only when needed
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$usePadding = ($body_size>($header_size*3)+4);
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// Using a for-loop with index-calculation instaid of str_split to avoid large memory consumption
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// Calculate the next DWORD-position in the body
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for ($i=0;$i<$body_size;$i+=3)
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{
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// Calculate line-ending and padding
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if ($x>=$width)
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{
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// If padding needed, ignore image-padding
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// Shift i to the ending of the current 32-bit-block
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if ($usePadding)
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$i += $width%4;
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// Reset horizontal position
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$x = 0;
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// Raise the height-position (bottom-up)
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$y++;
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// Reached the image-height? Break the for-loop
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if ($y>$height)
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break;
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}
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// Calculation of the RGB-pixel (defined as BGR in image-data)
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// Define $i_pos as absolute position in the body
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$i_pos = $i*2;
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$r = hexdec($body[$i_pos+4].$body[$i_pos+5]);
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$g = hexdec($body[$i_pos+2].$body[$i_pos+3]);
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$b = hexdec($body[$i_pos].$body[$i_pos+1]);
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// Calculate and draw the pixel
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$color = imagecolorallocate($image,$r,$g,$b);
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imagesetpixel($image,$x,$height-$y,$color);
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// Raise the horizontal position
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$x++;
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}
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// Unset the body / free the memory
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unset($body);
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// Return image-object
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return $image;
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}
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}
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