function findImageStack($subPrefix, $filesData) {
// The order of the image formats determines which will be returned first
$imageFormats = array('JP2' => 'jp2', 'TIFF' => 'tif', 'JPEG' => 'jpg');
$imageFormatOrder = array_values($imageFormats);
$archiveFormats = array('ZIP' => 'zip', 'Tar' => 'tar');
$imageGroup = implode('|', array_keys($imageFormats));
$archiveGroup = implode('|', array_keys($archiveFormats));
// $$$ Currently only return processed images
$imageStackRegex = "/Single Page (Processed) (${imageGroup}) (${archiveGroup})/";
// Strategy:
// - Find potential image stacks, regardless of subPrefix
// - If not given subPrefix sort based on potential subPrefix and assign based on asciibetical first
// - Filter results by subPrefix
// - Sort based on image format
// - Take best match
$imageStacks = array();
foreach ($filesData->file as $file) {
if ( preg_match($imageStackRegex, $file->format, $matches) === 1 ) {
$imageFormat = $imageFormats[$matches[2]];
$archiveFormat = $archiveFormats[$matches[3]];
$imageStackFile = $file['name'] . '';
if ( preg_match("#(.*)_${imageFormat}\.${archiveFormat}#", $imageStackFile, $matches) === 0) {
// stack filename not regular
continue;
} else {
array_push($imageStacks, array(
'imageFormat' => $imageFormat,
'archiveFormat' => $archiveFormat,
'imageStackFile' => $imageStackFile,
'subPrefix' => $matches[1])
);
}
}
}
// print("<pre>");
// print("found subPrefix $subPrefix\n");
// print_r($imageStacks);
// die(0);
function subPrefixSort($imageStackA, $imageStackB) {
return strcmp($imageStackA['subPrefix'], $imageStackB['subPrefix']);
}
if (! $subPrefix) {
usort($imageStacks, 'subPrefixSort');
$subPrefix = $imageStacks[0]['subPrefix'];
}
self::$cbData = $subPrefix;
function subPrefixFilter($imageStack) {
return $imageStack['subPrefix'] == BookReaderMeta::$cbData;
}
$imageStacks = array_filter($imageStacks, 'subPrefixFilter');
function formatSort($imageStackA, $imageStackB) {
$formatA = $imageStackA['imageFormat'];
$formatB = $imageStackB['imageFormat'];
if ($formatA == $formatB) {
return 0;
}
$indexA = array_search($formatA, $imageFormatOrder);
$indexB = array_search($formatB, $imageFormatOrder);
// We already matched base on format, so both indices should be set
if ($indexA == $indexB) {
return 0;
}
return ($indexA < $indexB) ? 1 : -1;
}
usort($imageStacks, 'formatSort'); // necessary to remap keys
if ( count($imageStacks) > 0 ) {
return $imageStacks[0];
} else {
return array('imageFormat' => 'unknown', 'archiveFormat' => 'unknown', 'imageStackFile' => 'unknown');
}
}
