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var zlib = require('zlib'); var Stream = require('stream'); var Promise = require('bluebird'); var PullStream = require('./PullStream'); var NoopStream = require('./NoopStream'); var BufferStream = require('./BufferStream'); var parseExtraField = require('./parseExtraField'); var parseDateTime = require('./parseDateTime'); var pipeline = Stream.pipeline; var parseBuffer = require('./parseBuffer'); var endDirectorySignature = Buffer.alloc(4); endDirectorySignature.writeUInt32LE(0x06054b50, 0); function Parse(opts) { if (!(this instanceof Parse)) { return new Parse(opts); } var self = this; self._opts = opts || { verbose: false }; PullStream.call(self, self._opts); self.on('finish',function() { self.emit('end'); self.emit('close'); }); self._readRecord().catch(function(e) { if (!self.__emittedError || self.__emittedError !== e) self.emit('error',e); }); } util.inherits(Parse, PullStream); Parse.prototype._readRecord = function () { var self = this; return self.pull(4).then(function(data) { if (data.length === 0) return; var signature = data.readUInt32LE(0); if (signature === 0x34327243) { return self._readCrxHeader(); } if (signature === 0x04034b50) { return self._readFile(); } else if (signature === 0x02014b50) { self.reachedCD = true; return self._readCentralDirectoryFileHeader(); } else if (signature === 0x06054b50) { return self._readEndOfCentralDirectoryRecord(); } else if (self.reachedCD) { // _readEndOfCentralDirectoryRecord expects the EOCD // signature to be consumed so set includeEof=true var includeEof = true; return self.pull(endDirectorySignature, includeEof).then(function() { return self._readEndOfCentralDirectoryRecord(); }); } else self.emit('error', new Error('invalid signature: 0x' + signature.toString(16))); }).then((function(loop) { if(loop) { return self._readRecord(); } })); }; Parse.prototype._readCrxHeader = function() { var self = this; return self.pull(12).then(function(data) { self.crxHeader = parseBuffer.parse(data, [ ['version', 4], ['pubKeyLength', 4], ['signatureLength', 4], ]); return self.pull(self.crxHeader.pubKeyLength + self.crxHeader.signatureLength); }).then(function(data) { self.crxHeader.publicKey = data.slice(0,self.crxHeader.pubKeyLength); self.crxHeader.signature = data.slice(self.crxHeader.pubKeyLength); self.emit('crx-header',self.crxHeader); return true; }); }; Parse.prototype._readFile = function () { var self = this; return self.pull(26).then(function(data) { var vars = parseBuffer.parse(data, [ ['versionsNeededToExtract', 2], ['flags', 2], ['compressionMethod', 2], ['lastModifiedTime', 2], ['lastModifiedDate', 2], ['crc32', 4], ['compressedSize', 4], ['uncompressedSize', 4], ['fileNameLength', 2], ['extraFieldLength', 2], ]); vars.lastModifiedDateTime = parseDateTime(vars.lastModifiedDate, vars.lastModifiedTime); if (self.crxHeader) vars.crxHeader = self.crxHeader; return self.pull(vars.fileNameLength).then(function(fileNameBuffer) { var fileName = fileNameBuffer.toString('utf8'); var entry = Stream.PassThrough(); var __autodraining = false; entry.autodrain = function() { __autodraining = true; var draining = entry.pipe(NoopStream()); draining.promise = function() { return new Promise(function(resolve, reject) { draining.on('finish',resolve); draining.on('error',reject); }); }; return draining; }; entry.buffer = function() { return BufferStream(entry); }; entry.path = fileName; entry.props = {}; entry.props.path = fileName; entry.props.pathBuffer = fileNameBuffer; entry.props.flags = { "isUnicode": (vars.flags & 0x800) != 0 }; entry.type = (vars.uncompressedSize === 0 && /[\/\\]$/.test(fileName)) ? 'Directory' : 'File'; if (self._opts.verbose) { if (entry.type === 'Directory') { console.log(' creating:', fileName); } else if (entry.type === 'File') { if (vars.compressionMethod === 0) { console.log(' extracting:', fileName); } else { console.log(' inflating:', fileName); } } } return self.pull(vars.extraFieldLength).then(function(extraField) { var extra = parseExtraField(extraField, vars); entry.vars = vars; entry.extra = extra; if (self._opts.forceStream) { self.push(entry); } else { self.emit('entry', entry); if (self._readableState.pipesCount || (self._readableState.pipes && self._readableState.pipes.length)) self.push(entry); } if (self._opts.verbose) console.log({ filename:fileName, vars: vars, extra: extra }); var fileSizeKnown = !(vars.flags & 0x08) || vars.compressedSize > 0, eof; entry.__autodraining = __autodraining; // expose __autodraining for test purposes var inflater = (vars.compressionMethod && !__autodraining) ? zlib.createInflateRaw() : Stream.PassThrough(); if (fileSizeKnown) { entry.size = vars.uncompressedSize; eof = vars.compressedSize; } else { eof = Buffer.alloc(4); eof.writeUInt32LE(0x08074b50, 0); } return new Promise(function(resolve, reject) { pipeline( self.stream(eof), inflater, entry, function (err) { if (err) { return reject(err); } return fileSizeKnown ? resolve(fileSizeKnown) : self._processDataDescriptor(entry).then(resolve).catch(reject); } ) }); }); }); }); }; Parse.prototype._processDataDescriptor = function (entry) { var self = this; return self.pull(16).then(function(data) { var vars = parseBuffer.parse(data, [ ['dataDescriptorSignature', 4], ['crc32', 4], ['compressedSize', 4], ['uncompressedSize', 4], ]); entry.size = vars.uncompressedSize; return true; }); }; Parse.prototype._readCentralDirectoryFileHeader = function () { var self = this; return self.pull(42).then(function(data) { var vars = parseBuffer.parse(data, [ ['versionMadeBy', 2], ['versionsNeededToExtract', 2], ['flags', 2], ['compressionMethod', 2], ['lastModifiedTime', 2], ['lastModifiedDate', 2], ['crc32', 4], ['compressedSize', 4], ['uncompressedSize', 4], ['fileNameLength', 2], ['extraFieldLength', 2], ['fileCommentLength', 2], ['diskNumber', 2], ['internalFileAttributes', 2], ['externalFileAttributes', 4], ['offsetToLocalFileHeader', 4], ]); return self.pull(vars.fileNameLength).then(function(fileName) { vars.fileName = fileName.toString('utf8'); return self.pull(vars.extraFieldLength); }) .then(function(extraField) { return self.pull(vars.fileCommentLength); }) .then(function(fileComment) { return true; }); }); }; Parse.prototype._readEndOfCentralDirectoryRecord = function() { var self = this; return self.pull(18).then(function(data) { var vars = parseBuffer.parse(data, [ ['diskNumber', 2], ['diskStart', 2], ['numberOfRecordsOnDisk', 2], ['numberOfRecords', 2], ['sizeOfCentralDirectory', 4], ['offsetToStartOfCentralDirectory', 4], ['commentLength', 2], ]); return self.pull(vars.commentLength).then(function(comment) { comment = comment.toString('utf8'); self.end(); self.push(null); }); }); }; Parse.prototype.promise = function() { var self = this; return new Promise(function(resolve,reject) { self.on('finish',resolve); self.on('error',reject); }); }; module.exports = Parse; |