module.archive.zip.php

一个用PHP编写的

<?php
/////////////////////////////////////////////////////////////////
/// getID3() by James Heinrich <[e-mail]>               //
//  available at http://getid3.sourceforge.net                 //
//            or http://www.getid3.org                         //
/////////////////////////////////////////////////////////////////
// See readme.txt for more details                             //
/////////////////////////////////////////////////////////////////
//                                                             //
// module.archive.zip.php                                      //
// module for analyzing pkZip files                            //
// dependencies: NONE                                          //
//                                                            ///
/////////////////////////////////////////////////////////////////


class getid3_zip
{

	function getid3_zip(&$fd, &$ThisFileInfo) {

		$ThisFileInfo['fileformat']      = 'zip';
		$ThisFileInfo['zip']['encoding'] = 'ISO-8859-1';
		$ThisFileInfo['zip']['files']    = array();

		$ThisFileInfo['zip']['compressed_size']   = 0;
		$ThisFileInfo['zip']['uncompressed_size'] = 0;
		$ThisFileInfo['zip']['entries_count']     = 0;

		$EOCDsearchData    = '';
		$EOCDsearchCounter = 0;
		while ($EOCDsearchCounter++ < 512) {

			fseek($fd, -128 * $EOCDsearchCounter, SEEK_END);
			$EOCDsearchData = fread($fd, 128).$EOCDsearchData;

			if (strstr($EOCDsearchData, 'PK'."\x05\x06")) {

				$EOCDposition = strpos($EOCDsearchData, 'PK'."\x05\x06");
				fseek($fd, (-128 * $EOCDsearchCounter) + $EOCDposition, SEEK_END);
				$ThisFileInfo['zip']['end_central_directory'] = $this->ZIPparseEndOfCentralDirectory($fd);

				fseek($fd, $ThisFileInfo['zip']['end_central_directory']['directory_offset'], SEEK_SET);
				$ThisFileInfo['zip']['entries_count'] = 0;
				while ($centraldirectoryentry = $this->ZIPparseCentralDirectory($fd)) {
					$ThisFileInfo['zip']['central_directory'][] = $centraldirectoryentry;
					$ThisFileInfo['zip']['entries_count']++;
					$ThisFileInfo['zip']['compressed_size']   += $centraldirectoryentry['compressed_size'];
					$ThisFileInfo['zip']['uncompressed_size'] += $centraldirectoryentry['uncompressed_size'];

					if ($centraldirectoryentry['uncompressed_size'] > 0) {
						$ThisFileInfo['zip']['files'] = getid3_lib::array_merge_clobber($ThisFileInfo['zip']['files'], getid3_lib::CreateDeepArray($centraldirectoryentry['filename'], '/', $centraldirectoryentry['uncompressed_size']));
					}
				}

				if ($ThisFileInfo['zip']['entries_count'] == 0) {
					$ThisFileInfo['error'][] = 'No Central Directory entries found (truncated file?)';
					return false;
				}

				if (!empty($ThisFileInfo['zip']['end_central_directory']['comment'])) {
					$ThisFileInfo['zip']['comments']['comment'][] = $ThisFileInfo['zip']['end_central_directory']['comment'];
				}

				if (isset($ThisFileInfo['zip']['central_directory'][0]['compression_method'])) {
					$ThisFileInfo['zip']['compression_method'] = $ThisFileInfo['zip']['central_directory'][0]['compression_method'];
				}
				if (isset($ThisFileInfo['zip']['central_directory'][0]['flags']['compression_speed'])) {
					$ThisFileInfo['zip']['compression_speed']  = $ThisFileInfo['zip']['central_directory'][0]['flags']['compression_speed'];
				}
				if (isset($ThisFileInfo['zip']['compression_method']) && ($ThisFileInfo['zip']['compression_method'] == 'store') && !isset($ThisFileInfo['zip']['compression_speed'])) {
					$ThisFileInfo['zip']['compression_speed']  = 'store';
				}

				return true;

			}

		}

		if ($this->getZIPentriesFilepointer($fd, $ThisFileInfo)) {

			// central directory couldn't be found and/or parsed
			// scan through actual file data entries, recover as much as possible from probable trucated file
			if ($ThisFileInfo['zip']['compressed_size'] > ($ThisFileInfo['filesize'] - 46 - 22)) {
				$ThisFileInfo['error'][] = 'Warning: Truncated file! - Total compressed file sizes ('.$ThisFileInfo['zip']['compressed_size'].' bytes) is greater than filesize minus Central Directory and End Of Central Directory structures ('.($ThisFileInfo['filesize'] - 46 - 22).' bytes)';
			}
			$ThisFileInfo['error'][] = 'Cannot find End Of Central Directory - returned list of files in [zip][entries] array may not be complete';
			foreach ($ThisFileInfo['zip']['entries'] as $key => $valuearray) {
				$ThisFileInfo['zip']['files'][$valuearray['filename']] = $valuearray['uncompressed_size'];
			}
			return true;

		} else {

			unset($ThisFileInfo['zip']);
			$ThisFileInfo['fileformat'] = '';
			$ThisFileInfo['error'][] = 'Cannot find End Of Central Directory (truncated file?)';
			return false;

		}
	}


	function getZIPHeaderFilepointerTopDown(&$fd, &$ThisFileInfo) {
		$ThisFileInfo['fileformat'] = 'zip';

		$ThisFileInfo['zip']['compressed_size']   = 0;
		$ThisFileInfo['zip']['uncompressed_size'] = 0;
		$ThisFileInfo['zip']['entries_count']     = 0;

		rewind($fd);
		while ($fileentry = $this->ZIPparseLocalFileHeader($fd)) {
			$ThisFileInfo['zip']['entries'][] = $fileentry;
			$ThisFileInfo['zip']['entries_count']++;
		}
		if ($ThisFileInfo['zip']['entries_count'] == 0) {
			$ThisFileInfo['error'][] = 'No Local File Header entries found';
			return false;
		}

		$ThisFileInfo['zip']['entries_count']     = 0;
		while ($centraldirectoryentry = $this->ZIPparseCentralDirectory($fd)) {
			$ThisFileInfo['zip']['central_directory'][] = $centraldirectoryentry;
			$ThisFileInfo['zip']['entries_count']++;
			$ThisFileInfo['zip']['compressed_size']   += $centraldirectoryentry['compressed_size'];
			$ThisFileInfo['zip']['uncompressed_size'] += $centraldirectoryentry['uncompressed_size'];
		}
		if ($ThisFileInfo['zip']['entries_count'] == 0) {
			$ThisFileInfo['error'][] = 'No Central Directory entries found (truncated file?)';
			return false;
		}

		if ($EOCD = $this->ZIPparseEndOfCentralDirectory($fd)) {
			$ThisFileInfo['zip']['end_central_directory'] = $EOCD;
		} else {
			$ThisFileInfo['error'][] = 'No End Of Central Directory entry found (truncated file?)';
			return false;
		}

		if (!empty($ThisFileInfo['zip']['end_central_directory']['comment'])) {
			$ThisFileInfo['zip']['comments']['comment'][] = $ThisFileInfo['zip']['end_central_directory']['comment'];
		}

		return true;
	}


	function getZIPentriesFilepointer(&$fd, &$ThisFileInfo) {
		$ThisFileInfo['zip']['compressed_size']   = 0;
		$ThisFileInfo['zip']['uncompressed_size'] = 0;
		$ThisFileInfo['zip']['entries_count']     = 0;

		rewind($fd);
		while ($fileentry = $this->ZIPparseLocalFileHeader($fd)) {
			$ThisFileInfo['zip']['entries'][] = $fileentry;
			$ThisFileInfo['zip']['entries_count']++;
			$ThisFileInfo['zip']['compressed_size']   += $fileentry['compressed_size'];
			$ThisFileInfo['zip']['uncompressed_size'] += $fileentry['uncompressed_size'];
		}
		if ($ThisFileInfo['zip']['entries_count'] == 0) {
			$ThisFileInfo['error'][] = 'No Local File Header entries found';
			return false;
		}

		return true;
	}


	function ZIPparseLocalFileHeader(&$fd) {
		$LocalFileHeader['offset'] = ftell($fd);

		$ZIPlocalFileHeader = fread($fd, 30);

		$LocalFileHeader['raw']['signature']          = getid3_lib::LittleEndian2Int(substr($ZIPlocalFileHeader,  0, 4));
		if ($LocalFileHeader['raw']['signature'] != 0x04034B50) {
			// invalid Local File Header Signature
			fseek($fd, $LocalFileHeader['offset'], SEEK_SET); // seek back to where filepointer originally was so it can be handled properly
			return false;
		}
		$LocalFileHeader['raw']['extract_version']    = getid3_lib::LittleEndian2Int(substr($ZIPlocalFileHeader,  4, 2));
		$LocalFileHeader['raw']['general_flags']      = getid3_lib::LittleEndian2Int(substr($ZIPlocalFileHeader,  6, 2));
		$LocalFileHeader['raw']['compression_method'] = getid3_lib::LittleEndian2Int(substr($ZIPlocalFileHeader,  8, 2));
		$LocalFileHeader['raw']['last_mod_file_time'] = getid3_lib::LittleEndian2Int(substr($ZIPlocalFileHeader, 10, 2));
		$LocalFileHeader['raw']['last_mod_file_date'] = getid3_lib::LittleEndian2Int(substr($ZIPlocalFileHeader, 12, 2));
		$LocalFileHeader['raw']['crc_32']             = getid3_lib::LittleEndian2Int(substr($ZIPlocalFileHeader, 14, 4));
		$LocalFileHeader['raw']['compressed_size']    = getid3_lib::LittleEndian2Int(substr($ZIPlocalFileHeader, 18, 4));
		$LocalFileHeader['raw']['uncompressed_size']  = getid3_lib::LittleEndian2Int(substr($ZIPlocalFileHeader, 22, 4));
		$LocalFileHeader['raw']['filename_length']    = getid3_lib::LittleEndian2Int(substr($ZIPlocalFileHeader, 26, 2));
		$LocalFileHeader['raw']['extra_field_length'] = getid3_lib::LittleEndian2Int(substr($ZIPlocalFileHeader, 28, 2));

		$LocalFileHeader['extract_version']           = sprintf('%1.1f', $LocalFileHeader['raw']['extract_version'] / 10);
		$LocalFileHeader['host_os']                   = $this->ZIPversionOSLookup(($LocalFileHeader['raw']['extract_version'] & 0xFF00) >> 8);
		$LocalFileHeader['compression_method']        = $this->ZIPcompressionMethodLookup($LocalFileHeader['raw']['compression_method']);
		$LocalFileHeader['compressed_size']           = $LocalFileHeader['raw']['compressed_size'];
		$LocalFileHeader['uncompressed_size']         = $LocalFileHeader['raw']['uncompressed_size'];
		$LocalFileHeader['flags']                     = $this->ZIPparseGeneralPurposeFlags($LocalFileHeader['raw']['general_flags'], $LocalFileHeader['raw']['compression_method']);
		$LocalFileHeader['last_modified_timestamp']   = $this->DOStime2UNIXtime($LocalFileHeader['raw']['last_mod_file_date'], $LocalFileHeader['raw']['last_mod_file_time']);

		$FilenameExtrafieldLength = $LocalFileHeader['raw']['filename_length'] + $LocalFileHeader['raw']['extra_field_length'];
		if ($FilenameExtrafieldLength > 0) {
			$ZIPlocalFileHeader .= fread($fd, $FilenameExtrafieldLength);

			if ($LocalFileHeader['raw']['filename_length'] > 0) {
				$LocalFileHeader['filename']                = substr($ZIPlocalFileHeader, 30, $LocalFileHeader['raw']['filename_length']);
			}
			if ($LocalFileHeader['raw']['extra_field_length'] > 0) {
				$LocalFileHeader['raw']['extra_field_data'] = substr($ZIPlocalFileHeader, 30 + $LocalFileHeader['raw']['filename_length'], $LocalFileHeader['raw']['extra_field_length']);