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
141 lines • 5.09 kB
JavaScript
/**
* DeflateStreamHandler - Streaming DEFLATE decompression with CRC
*
* Used for entries with known compressed size. Memory efficient because
* it decompresses data as it arrives rather than buffering everything.
*/ "use strict";
Object.defineProperty(exports, "__esModule", {
value: true
});
Object.defineProperty(exports, "DeflateStreamHandler", {
enumerable: true,
get: function() {
return DeflateStreamHandler;
}
});
var _extractbaseiterator = require("extract-base-iterator");
var _onone = /*#__PURE__*/ _interop_require_default(require("on-one"));
var _constantsts = /*#__PURE__*/ _interop_require_wildcard(require("../constants.js"));
function _class_call_check(instance, Constructor) {
if (!(instance instanceof Constructor)) {
throw new TypeError("Cannot call a class as a function");
}
}
function _interop_require_default(obj) {
return obj && obj.__esModule ? obj : {
default: obj
};
}
function _getRequireWildcardCache(nodeInterop) {
if (typeof WeakMap !== "function") return null;
var cacheBabelInterop = new WeakMap();
var cacheNodeInterop = new WeakMap();
return (_getRequireWildcardCache = function(nodeInterop) {
return nodeInterop ? cacheNodeInterop : cacheBabelInterop;
})(nodeInterop);
}
function _interop_require_wildcard(obj, nodeInterop) {
if (!nodeInterop && obj && obj.__esModule) {
return obj;
}
if (obj === null || typeof obj !== "object" && typeof obj !== "function") {
return {
default: obj
};
}
var cache = _getRequireWildcardCache(nodeInterop);
if (cache && cache.has(obj)) {
return cache.get(obj);
}
var newObj = {
__proto__: null
};
var hasPropertyDescriptor = Object.defineProperty && Object.getOwnPropertyDescriptor;
for(var key in obj){
if (key !== "default" && Object.prototype.hasOwnProperty.call(obj, key)) {
var desc = hasPropertyDescriptor ? Object.getOwnPropertyDescriptor(obj, key) : null;
if (desc && (desc.get || desc.set)) {
Object.defineProperty(newObj, key, desc);
} else {
newObj[key] = obj[key];
}
}
}
newObj.default = obj;
if (cache) {
cache.set(obj, newObj);
}
return newObj;
}
var DeflateStreamHandler = /*#__PURE__*/ function() {
"use strict";
function DeflateStreamHandler(options) {
var _this = this;
_class_call_check(this, DeflateStreamHandler);
this.runningCrc = 0;
this.waiting = false;
this.outputStream = options.outputStream;
this.onComplete = options.onComplete;
this.onError = options.onError;
this.verifyCrc = options.verifyCrc !== false;
// Create inflate stream
this.inflateStream = (0, _extractbaseiterator.createInflateRawStream)();
// Handle decompressed data
this.inflateStream.on('data', function(chunk) {
if (_this.verifyCrc) {
_this.runningCrc = (0, _extractbaseiterator.crc32)(chunk, _this.runningCrc);
}
_this.outputStream.write(chunk);
});
// Handle inflate errors
this.inflateStream.on('error', function(err) {
_this.onError(err);
});
}
var _proto = DeflateStreamHandler.prototype;
_proto.write = function write(chunk) {
if (this.inflateStream) this.inflateStream.write(chunk);
};
_proto.finish = function finish(expectedCrc) {
var _this = this;
if (this.waiting) {
return {
continue: false
};
}
this.waiting = true;
var inflateStream = this.inflateStream;
(0, _onone.default)(inflateStream, [
'end',
'close'
], function(_err) {
_this.waiting = false;
// Verify CRC
if (_this.verifyCrc) {
if (_this.runningCrc !== expectedCrc) {
_this.onError(_constantsts.createZipError("CRC32 mismatch: expected ".concat(expectedCrc.toString(16), ", got ").concat(_this.runningCrc.toString(16)), _constantsts.ZipErrorCode.CRC_MISMATCH));
return;
}
}
// Signal completion
_this.onComplete();
});
inflateStream.end();
return {
continue: false
}; // Async completion
};
_proto.getRunningCrc = function getRunningCrc() {
return this.runningCrc;
};
_proto.isWaiting = function isWaiting() {
return this.waiting;
};
_proto.destroy = function destroy() {
this.inflateStream = null;
this.runningCrc = 0;
this.waiting = false;
};
return DeflateStreamHandler;
}();
/* 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; }