<?php

/////////////////////////////////////////////////////////////////
/// getID3() by James Heinrich <info@getid3.org>               //
//  available at http://getid3.sourceforge.net                 //
//            or http://www.getid3.org                         //
//          also https://github.com/JamesHeinrich/getID3       //
/////////////////////////////////////////////////////////////////
//                                                             //
// /demo/demo.zip.php - part of getID3()                       //
// Sample script how to use getID3() to decompress zip files   //
// See readme.txt for more details                             //
//                                                            ///
/////////////////////////////////////////////////////////////////

function UnzipFileContents($filename, &$errors)
{
    $errors = [];
    $DecompressedFileContents = [];
    if (! class_exists('getID3')) {
        $errors[] = 'class getID3 not defined, please include getid3.php';
    } elseif (include_once 'module.archive.zip.php') {
        $getid3 = new getID3();
        $getid3->info['filesize'] = filesize($filename);
        ob_start();
        if ($getid3->fp = fopen($filename, 'rb')) {
            ob_end_clean();
            $getid3_zip = new getid3_zip($getid3);
            $getid3_zip->analyze($filename);
            if (($getid3->info['fileformat'] == 'zip') && ! empty($getid3->info['zip']['files'])) {
                if (! empty($getid3->info['zip']['central_directory'])) {
                    $ZipDirectoryToWalk = $getid3->info['zip']['central_directory'];
                } elseif (! empty($getid3->info['zip']['entries'])) {
                    $ZipDirectoryToWalk = $getid3->info['zip']['entries'];
                } else {
                    $errors[] = 'failed to parse ZIP attachment "'.$piece_filename.'" (no central directory)<br>';
                    fclose($getid3->fp);

                    return false;
                }
                foreach ($ZipDirectoryToWalk as $key => $valuearray) {
                    fseek($getid3->fp, $valuearray['entry_offset'], SEEK_SET);
                    $LocalFileHeader = $getid3_zip->ZIPparseLocalFileHeader($getid3->fp);
                    if ($LocalFileHeader['flags']['encrypted']) {
                        // password-protected
                        $DecompressedFileContents[$valuearray['filename']] = '';
                    } else {
                        fseek($getid3->fp, $LocalFileHeader['data_offset'], SEEK_SET);
                        $compressedFileData = '';
                        while ((strlen($compressedFileData) < $LocalFileHeader['compressed_size']) && ! feof($getid3->fp)) {
                            $compressedFileData .= fread($getid3->fp, 32768);
                        }
                        switch ($LocalFileHeader['raw']['compression_method']) {
                            case 0: // store - great, just copy data unchanged
                                $uncompressedFileData = $compressedFileData;
                                break;

                            case 8: // deflate
                                ob_start();
                                $uncompressedFileData = gzinflate($compressedFileData);
                                $gzinflate_errors = trim(strip_tags(ob_get_contents()));
                                ob_end_clean();
                                if ($gzinflate_errors) {
                                    $errors[] = 'gzinflate() failed for file ['.$LocalFileHeader['filename'].']: "'.$gzinflate_errors.'"';
                                    continue 2;
                                }
                                break;

                            case 1:  // shrink
                            case 2:  // reduce-1
                            case 3:  // reduce-2
                            case 4:  // reduce-3
                            case 5:  // reduce-4
                            case 6:  // implode
                            case 7:  // tokenize
                            case 9:  // deflate64
                            case 10: // PKWARE Date Compression Library Imploding
                                $DecompressedFileContents[$valuearray['filename']] = '';
                                $errors[] = 'unsupported ZIP compression method ('.$LocalFileHeader['raw']['compression_method'].' = '.$getid3_zip->ZIPcompressionMethodLookup($LocalFileHeader['raw']['compression_method']).')';
                                continue 2;

                            default:
                                $DecompressedFileContents[$valuearray['filename']] = '';
                                $errors[] = 'unknown ZIP compression method ('.$LocalFileHeader['raw']['compression_method'].')';
                                continue 2;
                        }
                        $DecompressedFileContents[$valuearray['filename']] = $uncompressedFileData;
                        unset($compressedFileData);
                    }
                }
            } else {
                $errors[] = $filename.' does not appear to be a zip file';
            }
        } else {
            $error_message = ob_get_contents();
            ob_end_clean();
            $errors[] = 'failed to fopen('.$filename.', rb): '.$error_message;
        }
    } else {
        $errors[] = 'failed to include_once(module.archive.zip.php)';
    }

    return $DecompressedFileContents;
}