zip-iterator
Version:
Extract contents from zip archive type using an iterator API using streams or paths. Use stream interface and pipe transforms to add decompression algorithms
160 lines • 6.46 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", {
value: true
});
Object.defineProperty(exports, "default", {
enumerable: true,
get: function() {
return Zip;
}
});
var _zip = require("zip");
var _fs = /*#__PURE__*/ _interop_require_default(require("fs"));
var _stream = require("stream");
var _zlib = /*#__PURE__*/ _interop_require_default(require("zlib"));
function _assert_this_initialized(self) {
if (self === void 0) {
throw new ReferenceError("this hasn't been initialised - super() hasn't been called");
}
return self;
}
function _call_super(_this, derived, args) {
derived = _get_prototype_of(derived);
return _possible_constructor_return(_this, _is_native_reflect_construct() ? Reflect.construct(derived, args || [], _get_prototype_of(_this).constructor) : derived.apply(_this, args));
}
function _class_call_check(instance, Constructor) {
if (!(instance instanceof Constructor)) {
throw new TypeError("Cannot call a class as a function");
}
}
function _get_prototype_of(o) {
_get_prototype_of = Object.setPrototypeOf ? Object.getPrototypeOf : function getPrototypeOf(o) {
return o.__proto__ || Object.getPrototypeOf(o);
};
return _get_prototype_of(o);
}
function _inherits(subClass, superClass) {
if (typeof superClass !== "function" && superClass !== null) {
throw new TypeError("Super expression must either be null or a function");
}
subClass.prototype = Object.create(superClass && superClass.prototype, {
constructor: {
value: subClass,
writable: true,
configurable: true
}
});
if (superClass) _set_prototype_of(subClass, superClass);
}
function _interop_require_default(obj) {
return obj && obj.__esModule ? obj : {
default: obj
};
}
function _possible_constructor_return(self, call) {
if (call && (_type_of(call) === "object" || typeof call === "function")) {
return call;
}
return _assert_this_initialized(self);
}
function _set_prototype_of(o, p) {
_set_prototype_of = Object.setPrototypeOf || function setPrototypeOf(o, p) {
o.__proto__ = p;
return o;
};
return _set_prototype_of(o, p);
}
function _type_of(obj) {
"@swc/helpers - typeof";
return obj && typeof Symbol !== "undefined" && obj.constructor === Symbol ? "symbol" : typeof obj;
}
function _is_native_reflect_construct() {
try {
var result = !Boolean.prototype.valueOf.call(Reflect.construct(Boolean, [], function() {}));
} catch (_) {}
return (_is_native_reflect_construct = function() {
return !!result;
})();
}
var decodeDateTime = function(date, time) {
return new Date((date >>> 9) + 1980, (date >>> 5 & 15) - 1, date & 31, time >>> 11 & 31, time >>> 5 & 63, (time & 63) * 2);
};
var Zip = /*#__PURE__*/ function(Reader) {
"use strict";
_inherits(Zip, Reader);
function Zip(fd) {
_class_call_check(this, Zip);
var _this;
_this = _call_super(this, Zip, [
fd
]);
_this._source.read = function(start, length) {
var result = Buffer.alloc(length);
var pos = 0;
while(length > 0){
var toRead = Math.min(length, 8192);
_fs.default.readSync(fd, result, pos, toRead, start);
length -= toRead;
start += toRead;
pos += toRead;
}
return result;
};
return _this;
}
var _proto = Zip.prototype;
_proto.iterator = function iterator() {
var stream = this;
// find the end record and read it
stream.locateEndOfCentralDirectoryRecord();
var endRecord = stream.readEndOfCentralDirectoryRecord();
// seek to the beginning of the central directory
stream.seek(endRecord.central_dir_offset);
var count = endRecord.central_dir_disk_records;
return {
next: function() {
if (count-- === 0) throw 'stop-iteration';
// read the central directory header
var centralHeader = stream.readCentralDirectoryFileHeader();
// save our new position so we can restore it
var saved = stream.position();
// seek to the local header and read it
stream.seek(centralHeader.local_file_header_offset);
var localHeader = stream.readLocalFileHeader();
// dont read the content just save the position for later use
var start = stream.position();
// seek back to the next central directory header
stream.seek(saved);
return {
localHeader: localHeader,
stream: stream,
start: start,
centralHeader: centralHeader,
lastModified: function() {
return decodeDateTime(localHeader.last_mod_file_date, localHeader.last_mod_file_time);
},
getStream: function() {
var offset = start;
var remaining = centralHeader.compressed_size;
var res = new _stream.Readable();
res._read = function(size) {
if (remaining <= 0) return this.push(null); // done
if (size > remaining) size = remaining; // clamp
var bookmark = stream.position(); // save
stream.seek(offset);
var chunk = stream.read(size);
remaining -= size;
offset += size;
stream.seek(bookmark); // restore
this.push(chunk);
};
if (centralHeader.compression_method !== 0) res = res.pipe(_zlib.default.createInflateRaw());
return res;
}
};
}
};
};
return Zip;
}(_zip.Reader);
/* CJS INTEROP */ if (exports.__esModule && exports.default) { try { Object.defineProperty(exports.default, '__esModule', { value: true }); for (var key in exports) { exports.default[key] = exports[key]; } } catch (_) {}; module.exports = exports.default; }