/**
* Checks whether sufficient memory is available to load and process an image.
*/
protected function checkMemory($imagepath)
{
$memory_available = ShowPlusUtility::memory_get_available();
if ($memory_available !== false) {
$imagedata = getimagesize($imagepath);
if ($imagedata === false) {
return;
}
if (!isset($imagedata['channels'])) {
// assume RGB (i.e. 3 channels)
$imagedata['channels'] = 3;
}
if (!isset($imagedata['bits'])) {
// assume 8 bits per channel
$imagedata['bits'] = 8;
}
$memory_required = (int) ceil($imagedata[0] * $imagedata[1] * $imagedata['channels'] * $imagedata['bits'] / 8);
if ($memory_required >= $memory_available) {
throw new ShowPlusOutOfMemoryException($memory_required, $memory_available, $imagepath);
}
}
}
/**
* Short captions attached to images where the labels source is a string.
* @return An array of ShowPlusImageLabel instances, or an empty array.
*/
private function getLabelsFromString($contents)
{
$contents = str_replace("\r", "\n", $contents);
// normalize line endings
$matches = array();
preg_match_all('/^([^|\\r\\n]+)(?:[|]([^|\\r\\n]*)(?:[|]([^\\r\\n]*))?)?$/mu', $contents, $matches, PREG_SET_ORDER);
switch (preg_last_error()) {
case PREG_BAD_UTF8_ERROR:
throw new ShowPlusEncodingException($labelsfile);
}
foreach ($matches as $match) {
$imagefile = $match[1];
$hyperlink = false;
$caption = false;
switch (count($match) - 1) {
case 3:
$hyperlink = $match[2];
$caption = html_entity_decode($match[3], ENT_QUOTES, 'UTF-8');
break;
case 2:
if (preg_match('/^(?:https?|ftps?|javascript):/', $match[2])) {
// looks like a URL
$hyperlink = $match[2];
} else {
$caption = html_entity_decode($match[2], ENT_QUOTES, 'UTF-8');
}
break;
}
if ($imagefile == '*') {
// set default label
if ($hyperlink) {
$this->params->deflink = $hyperlink;
}
if ($caption) {
$this->params->defcaption = $caption;
}
} else {
if (ShowPlusUtility::is_remote_path($imagefile)) {
// a URL to a remote image
$imagefile = ShowPlusUtility::safeurlencode($imagefile);
} else {
// a local image
$imagefile = ShowPlusUtility::file_exists_lenient($this->params->folder . DIRECTORY_SEPARATOR . $imagefile);
if ($imagefile === false) {
// check that image file truly exists
continue;
}
}
$labels[] = new ShowPlusImageLabel($imagefile, $hyperlink, $caption);
}
}
return $labels;
}
