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339 lines
11 KiB
JavaScript
339 lines
11 KiB
JavaScript
2 years ago
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var Utils = require("../util"),
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Constants = Utils.Constants;
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/* The central directory file header */
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module.exports = function () {
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var _verMade = 20, // v2.0
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_version = 10, // v1.0
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_flags = 0,
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_method = 0,
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_time = 0,
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_crc = 0,
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_compressedSize = 0,
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_size = 0,
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_fnameLen = 0,
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_extraLen = 0,
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_comLen = 0,
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_diskStart = 0,
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_inattr = 0,
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_attr = 0,
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_offset = 0;
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_verMade |= Utils.isWin ? 0x0a00 : 0x0300;
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// Set EFS flag since filename and comment fields are all by default encoded using UTF-8.
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// Without it file names may be corrupted for other apps when file names use unicode chars
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_flags |= Constants.FLG_EFS;
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var _dataHeader = {};
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function setTime(val) {
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val = new Date(val);
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_time =
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(((val.getFullYear() - 1980) & 0x7f) << 25) | // b09-16 years from 1980
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((val.getMonth() + 1) << 21) | // b05-08 month
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(val.getDate() << 16) | // b00-04 hour
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// 2 bytes time
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(val.getHours() << 11) | // b11-15 hour
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(val.getMinutes() << 5) | // b05-10 minute
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(val.getSeconds() >> 1); // b00-04 seconds divided by 2
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}
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setTime(+new Date());
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return {
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get made() {
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return _verMade;
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},
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set made(val) {
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_verMade = val;
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},
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get version() {
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return _version;
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},
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set version(val) {
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_version = val;
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},
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get flags() {
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return _flags;
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},
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set flags(val) {
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_flags = val;
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},
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get method() {
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return _method;
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},
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set method(val) {
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switch (val) {
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case Constants.STORED:
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this.version = 10;
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case Constants.DEFLATED:
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default:
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this.version = 20;
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}
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_method = val;
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},
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get time() {
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return new Date(((_time >> 25) & 0x7f) + 1980, ((_time >> 21) & 0x0f) - 1, (_time >> 16) & 0x1f, (_time >> 11) & 0x1f, (_time >> 5) & 0x3f, (_time & 0x1f) << 1);
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},
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set time(val) {
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setTime(val);
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},
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get crc() {
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return _crc;
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},
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set crc(val) {
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_crc = Math.max(0, val) >>> 0;
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},
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get compressedSize() {
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return _compressedSize;
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},
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set compressedSize(val) {
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_compressedSize = Math.max(0, val) >>> 0;
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},
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get size() {
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return _size;
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},
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set size(val) {
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_size = Math.max(0, val) >>> 0;
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},
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get fileNameLength() {
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return _fnameLen;
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},
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set fileNameLength(val) {
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_fnameLen = val;
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},
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get extraLength() {
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return _extraLen;
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},
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set extraLength(val) {
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_extraLen = val;
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},
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get commentLength() {
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return _comLen;
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},
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set commentLength(val) {
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_comLen = val;
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},
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get diskNumStart() {
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return _diskStart;
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},
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set diskNumStart(val) {
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_diskStart = Math.max(0, val) >>> 0;
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},
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get inAttr() {
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return _inattr;
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},
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set inAttr(val) {
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_inattr = Math.max(0, val) >>> 0;
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},
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get attr() {
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return _attr;
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},
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set attr(val) {
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_attr = Math.max(0, val) >>> 0;
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},
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// get Unix file permissions
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get fileAttr() {
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return _attr ? (((_attr >>> 0) | 0) >> 16) & 0xfff : 0;
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},
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get offset() {
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return _offset;
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},
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set offset(val) {
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_offset = Math.max(0, val) >>> 0;
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},
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get encripted() {
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return (_flags & 1) === 1;
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},
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get entryHeaderSize() {
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return Constants.CENHDR + _fnameLen + _extraLen + _comLen;
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},
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get realDataOffset() {
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return _offset + Constants.LOCHDR + _dataHeader.fnameLen + _dataHeader.extraLen;
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},
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get dataHeader() {
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return _dataHeader;
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},
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loadDataHeaderFromBinary: function (/*Buffer*/ input) {
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var data = input.slice(_offset, _offset + Constants.LOCHDR);
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// 30 bytes and should start with "PK\003\004"
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if (data.readUInt32LE(0) !== Constants.LOCSIG) {
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throw new Error(Utils.Errors.INVALID_LOC);
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}
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_dataHeader = {
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// version needed to extract
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version: data.readUInt16LE(Constants.LOCVER),
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// general purpose bit flag
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flags: data.readUInt16LE(Constants.LOCFLG),
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// compression method
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method: data.readUInt16LE(Constants.LOCHOW),
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// modification time (2 bytes time, 2 bytes date)
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time: data.readUInt32LE(Constants.LOCTIM),
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// uncompressed file crc-32 value
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crc: data.readUInt32LE(Constants.LOCCRC),
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// compressed size
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compressedSize: data.readUInt32LE(Constants.LOCSIZ),
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// uncompressed size
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size: data.readUInt32LE(Constants.LOCLEN),
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// filename length
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fnameLen: data.readUInt16LE(Constants.LOCNAM),
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// extra field length
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extraLen: data.readUInt16LE(Constants.LOCEXT)
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};
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},
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loadFromBinary: function (/*Buffer*/ data) {
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// data should be 46 bytes and start with "PK 01 02"
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if (data.length !== Constants.CENHDR || data.readUInt32LE(0) !== Constants.CENSIG) {
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throw new Error(Utils.Errors.INVALID_CEN);
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}
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// version made by
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_verMade = data.readUInt16LE(Constants.CENVEM);
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// version needed to extract
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_version = data.readUInt16LE(Constants.CENVER);
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// encrypt, decrypt flags
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_flags = data.readUInt16LE(Constants.CENFLG);
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// compression method
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_method = data.readUInt16LE(Constants.CENHOW);
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// modification time (2 bytes time, 2 bytes date)
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_time = data.readUInt32LE(Constants.CENTIM);
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// uncompressed file crc-32 value
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_crc = data.readUInt32LE(Constants.CENCRC);
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// compressed size
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_compressedSize = data.readUInt32LE(Constants.CENSIZ);
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// uncompressed size
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_size = data.readUInt32LE(Constants.CENLEN);
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// filename length
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_fnameLen = data.readUInt16LE(Constants.CENNAM);
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// extra field length
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_extraLen = data.readUInt16LE(Constants.CENEXT);
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// file comment length
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_comLen = data.readUInt16LE(Constants.CENCOM);
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// volume number start
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_diskStart = data.readUInt16LE(Constants.CENDSK);
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// internal file attributes
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_inattr = data.readUInt16LE(Constants.CENATT);
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// external file attributes
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_attr = data.readUInt32LE(Constants.CENATX);
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// LOC header offset
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_offset = data.readUInt32LE(Constants.CENOFF);
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},
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dataHeaderToBinary: function () {
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// LOC header size (30 bytes)
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var data = Buffer.alloc(Constants.LOCHDR);
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// "PK\003\004"
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data.writeUInt32LE(Constants.LOCSIG, 0);
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// version needed to extract
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data.writeUInt16LE(_version, Constants.LOCVER);
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// general purpose bit flag
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data.writeUInt16LE(_flags, Constants.LOCFLG);
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// compression method
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data.writeUInt16LE(_method, Constants.LOCHOW);
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// modification time (2 bytes time, 2 bytes date)
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data.writeUInt32LE(_time, Constants.LOCTIM);
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// uncompressed file crc-32 value
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data.writeUInt32LE(_crc, Constants.LOCCRC);
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// compressed size
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data.writeUInt32LE(_compressedSize, Constants.LOCSIZ);
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// uncompressed size
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data.writeUInt32LE(_size, Constants.LOCLEN);
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// filename length
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data.writeUInt16LE(_fnameLen, Constants.LOCNAM);
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// extra field length
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data.writeUInt16LE(_extraLen, Constants.LOCEXT);
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return data;
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},
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entryHeaderToBinary: function () {
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// CEN header size (46 bytes)
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var data = Buffer.alloc(Constants.CENHDR + _fnameLen + _extraLen + _comLen);
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// "PK\001\002"
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data.writeUInt32LE(Constants.CENSIG, 0);
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// version made by
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data.writeUInt16LE(_verMade, Constants.CENVEM);
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// version needed to extract
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data.writeUInt16LE(_version, Constants.CENVER);
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// encrypt, decrypt flags
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data.writeUInt16LE(_flags, Constants.CENFLG);
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// compression method
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data.writeUInt16LE(_method, Constants.CENHOW);
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// modification time (2 bytes time, 2 bytes date)
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data.writeUInt32LE(_time, Constants.CENTIM);
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// uncompressed file crc-32 value
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data.writeUInt32LE(_crc, Constants.CENCRC);
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// compressed size
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data.writeUInt32LE(_compressedSize, Constants.CENSIZ);
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// uncompressed size
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data.writeUInt32LE(_size, Constants.CENLEN);
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// filename length
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data.writeUInt16LE(_fnameLen, Constants.CENNAM);
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// extra field length
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data.writeUInt16LE(_extraLen, Constants.CENEXT);
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// file comment length
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data.writeUInt16LE(_comLen, Constants.CENCOM);
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// volume number start
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data.writeUInt16LE(_diskStart, Constants.CENDSK);
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// internal file attributes
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data.writeUInt16LE(_inattr, Constants.CENATT);
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// external file attributes
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data.writeUInt32LE(_attr, Constants.CENATX);
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// LOC header offset
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data.writeUInt32LE(_offset, Constants.CENOFF);
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// fill all with
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data.fill(0x00, Constants.CENHDR);
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return data;
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},
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toJSON: function () {
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const bytes = function (nr) {
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return nr + " bytes";
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};
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return {
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made: _verMade,
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version: _version,
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flags: _flags,
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method: Utils.methodToString(_method),
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time: this.time,
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crc: "0x" + _crc.toString(16).toUpperCase(),
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compressedSize: bytes(_compressedSize),
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size: bytes(_size),
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fileNameLength: bytes(_fnameLen),
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extraLength: bytes(_extraLen),
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commentLength: bytes(_comLen),
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diskNumStart: _diskStart,
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inAttr: _inattr,
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attr: _attr,
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offset: _offset,
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entryHeaderSize: bytes(Constants.CENHDR + _fnameLen + _extraLen + _comLen)
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};
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},
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toString: function () {
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return JSON.stringify(this.toJSON(), null, "\t");
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}
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};
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};
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