function qa_image_constrain_data($imagedata, &$width, &$height, $size)
{
$inimage = @imagecreatefromstring($imagedata);
if (is_resource($inimage)) {
$width = imagesx($inimage);
$height = imagesy($inimage);
if (qa_image_constrain($width, $height, $size)) {
qa_gd_image_resize($inimage, $width, $height);
}
}
if (is_resource($inimage)) {
$imagedata = qa_gd_image_jpeg($inimage);
imagedestroy($inimage);
return $imagedata;
}
return null;
}
function qa_image_constrain_data($imagedata, &$width, &$height, $maxwidth, $maxheight = null)
{
$inimage = @imagecreatefromstring($imagedata);
if (is_resource($inimage)) {
$width = imagesx($inimage);
$height = imagesy($inimage);
// always call qa_gd_image_resize(), even if the size is the same, to take care of possible PNG transparency
qa_image_constrain($width, $height, $maxwidth, $maxheight);
qa_gd_image_resize($inimage, $width, $height);
}
if (is_resource($inimage)) {
$imagedata = qa_gd_image_jpeg($inimage);
imagedestroy($inimage);
return $imagedata;
}
return null;
}
function qa_upload_file($localfilename, $sourcefilename, $maxfilesize = null, $onlyimage = false, $imagemaxwidth = null, $imagemaxheight = null)
{
if (qa_to_override(__FUNCTION__)) {
$args = func_get_args();
return qa_call_override(__FUNCTION__, $args);
}
$result = array();
// Check per-user upload limits
require_once QA_INCLUDE_DIR . 'qa-app-users.php';
require_once QA_INCLUDE_DIR . 'qa-app-limits.php';
switch (qa_user_permit_error(null, QA_LIMIT_UPLOADS)) {
case 'limit':
$result['error'] = qa_lang('main/upload_limit');
return $result;
case false:
qa_limits_increment(qa_get_logged_in_userid(), QA_LIMIT_UPLOADS);
break;
default:
$result['error'] = qa_lang('users/no_permission');
return $result;
}
// Check the uploaded file is not too large
$filesize = filesize($localfilename);
if (isset($maxfilesize)) {
$maxfilesize = min($maxfilesize, qa_get_max_upload_size());
} else {
$maxfilesize = qa_get_max_upload_size();
}
if ($filesize <= 0 || $filesize > $maxfilesize) {
// if file was too big for PHP, $filesize will be zero
$result['error'] = qa_lang_sub('main/max_upload_size_x', number_format($maxfilesize / 1048576, 1) . 'MB');
return $result;
}
// Find out what type of source file was uploaded and if appropriate, check it's an image and get preliminary size measure
$pathinfo = pathinfo($sourcefilename);
$format = strtolower(@$pathinfo['extension']);
$isimage = $format == 'png' || $format == 'gif' || $format == 'jpeg' || $format == 'jpg';
// allowed image extensions
if ($isimage) {
$imagesize = @getimagesize($localfilename);
if (is_array($imagesize)) {
$result['width'] = $imagesize[0];
$result['height'] = $imagesize[1];
switch ($imagesize['2']) {
// reassign format based on actual content, if we can
case IMAGETYPE_GIF:
$format = 'gif';
break;
case IMAGETYPE_JPEG:
$format = 'jpeg';
break;
case IMAGETYPE_PNG:
$format = 'png';
break;
}
}
}
$result['format'] = $format;
if ($onlyimage) {
if (!$isimage || !is_array($imagesize)) {
$result['error'] = qa_lang_sub('main/image_not_read', 'GIF, JPG, PNG');
return $result;
}
}
// Read in the raw file contents
$content = file_get_contents($localfilename);
// If appropriate, get more accurate image size and apply constraints to it
require_once QA_INCLUDE_DIR . 'qa-util-image.php';
if ($isimage && qa_has_gd_image()) {
$image = @imagecreatefromstring($content);
if (is_resource($image)) {
$result['width'] = $width = imagesx($image);
$result['height'] = $height = imagesy($image);
if (isset($imagemaxwidth) || isset($imagemaxheight)) {
if (qa_image_constrain($width, $height, isset($imagemaxwidth) ? $imagemaxwidth : $width, isset($imagemaxheight) ? $imagemaxheight : $height)) {
qa_gd_image_resize($image, $width, $height);
if (is_resource($image)) {
$content = qa_gd_image_jpeg($image);
$result['format'] = $format = 'jpeg';
$result['width'] = $width;
$result['height'] = $height;
}
}
}
if (is_resource($image)) {
// might have been lost
imagedestroy($image);
}
}
}
// Create the blob and return
require_once QA_INCLUDE_DIR . 'qa-app-blobs.php';
$userid = qa_get_logged_in_userid();
$cookieid = isset($userid) ? qa_cookie_get() : qa_cookie_get_create();
$result['blobid'] = qa_create_blob($content, $format, $sourcefilename, $userid, $cookieid, qa_remote_ip_address());
if (!isset($result['blobid'])) {
$result['error'] = qa_lang('main/general_error');
return $result;
}
$result['bloburl'] = qa_get_blob_url($result['blobid'], true);
return $result;
}