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124 lines
3.7 KiB
124 lines
3.7 KiB
var Promise = require('bluebird');
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var Decrypt = require('../Decrypt');
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var PullStream = require('../PullStream');
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var Stream = require('stream');
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var binary = require('binary');
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var zlib = require('zlib');
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var parseExtraField = require('../parseExtraField');
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var Buffer = require('../Buffer');
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var parseDateTime = require('../parseDateTime');
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// Backwards compatibility for node versions < 8
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if (!Stream.Writable || !Stream.Writable.prototype.destroy)
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Stream = require('readable-stream');
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module.exports = function unzip(source,offset,_password, directoryVars) {
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var file = PullStream(),
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entry = Stream.PassThrough();
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var req = source.stream(offset);
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req.pipe(file).on('error', function(e) {
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entry.emit('error', e);
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});
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entry.vars = file.pull(30)
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.then(function(data) {
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var vars = binary.parse(data)
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.word32lu('signature')
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.word16lu('versionsNeededToExtract')
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.word16lu('flags')
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.word16lu('compressionMethod')
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.word16lu('lastModifiedTime')
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.word16lu('lastModifiedDate')
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.word32lu('crc32')
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.word32lu('compressedSize')
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.word32lu('uncompressedSize')
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.word16lu('fileNameLength')
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.word16lu('extraFieldLength')
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.vars;
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vars.lastModifiedDateTime = parseDateTime(vars.lastModifiedDate, vars.lastModifiedTime);
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return file.pull(vars.fileNameLength)
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.then(function(fileName) {
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vars.fileName = fileName.toString('utf8');
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return file.pull(vars.extraFieldLength);
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})
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.then(function(extraField) {
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var checkEncryption;
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vars.extra = parseExtraField(extraField, vars);
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// Ignore logal file header vars if the directory vars are available
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if (directoryVars && directoryVars.compressedSize) vars = directoryVars;
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if (vars.flags & 0x01) checkEncryption = file.pull(12)
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.then(function(header) {
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if (!_password)
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throw new Error('MISSING_PASSWORD');
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var decrypt = Decrypt();
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String(_password).split('').forEach(function(d) {
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decrypt.update(d);
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});
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for (var i=0; i < header.length; i++)
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header[i] = decrypt.decryptByte(header[i]);
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vars.decrypt = decrypt;
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vars.compressedSize -= 12;
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var check = (vars.flags & 0x8) ? (vars.lastModifiedTime >> 8) & 0xff : (vars.crc32 >> 24) & 0xff;
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if (header[11] !== check)
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throw new Error('BAD_PASSWORD');
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return vars;
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});
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return Promise.resolve(checkEncryption)
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.then(function() {
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entry.emit('vars',vars);
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return vars;
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});
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});
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});
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entry.vars.then(function(vars) {
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var fileSizeKnown = !(vars.flags & 0x08) || vars.compressedSize > 0,
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eof;
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var inflater = vars.compressionMethod ? zlib.createInflateRaw() : Stream.PassThrough();
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if (fileSizeKnown) {
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entry.size = vars.uncompressedSize;
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eof = vars.compressedSize;
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} else {
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eof = Buffer.alloc(4);
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eof.writeUInt32LE(0x08074b50, 0);
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}
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var stream = file.stream(eof);
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if (vars.decrypt)
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stream = stream.pipe(vars.decrypt.stream());
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stream
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.pipe(inflater)
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.on('error',function(err) { entry.emit('error',err);})
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.pipe(entry)
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.on('finish', function() {
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if (req.abort)
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req.abort();
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else if (req.close)
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req.close();
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else if (req.push)
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req.push();
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else
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console.log('warning - unable to close stream');
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});
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})
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.catch(function(e) {
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entry.emit('error',e);
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});
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return entry;
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};
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