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 • 5.08 kB
JavaScript
/**
* DeflateBufferHandler - Buffered DEFLATE decompression
*
* Used for entries with data descriptors where compressed size is unknown.
* Buffers all compressed data, then decompresses once the boundary is found.
*/ "use strict";
Object.defineProperty(exports, "__esModule", {
value: true
});
Object.defineProperty(exports, "DeflateBufferHandler", {
enumerable: true,
get: function() {
return DeflateBufferHandler;
}
});
var _extractbaseiterator = require("extract-base-iterator");
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 _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 DeflateBufferHandler = /*#__PURE__*/ function() {
"use strict";
function DeflateBufferHandler(options) {
_class_call_check(this, DeflateBufferHandler);
this.chunks = [];
this.runningCrc = 0;
this.outputStream = options.outputStream;
this.onComplete = options.onComplete;
this.onError = options.onError;
this.verifyCrc = options.verifyCrc !== false;
}
var _proto = DeflateBufferHandler.prototype;
_proto.write = function write(chunk) {
this.chunks.push(chunk);
};
/**
* Decompress all buffered data and verify CRC
*/ _proto.finish = function finish(expectedCrc) {
if (this.chunks.length === 0) {
// No data to decompress
this.onComplete();
return {
continue: true
};
}
try {
// Concatenate all chunks
var compressedData = Buffer.concat(this.chunks);
this.chunks = [];
// Decompress using native zlib (Node 0.11.12+) or pako fallback
var decompressed = (0, _extractbaseiterator.inflateRaw)(compressedData);
// Verify CRC
if (this.verifyCrc) {
this.runningCrc = (0, _extractbaseiterator.crc32)(decompressed);
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 {
continue: false
};
}
}
// Write decompressed data
this.outputStream.write(decompressed);
this.onComplete();
return {
continue: true
};
} catch (err) {
this.onError(err);
return {
continue: false,
error: err
};
}
};
_proto.getRunningCrc = function getRunningCrc() {
return this.runningCrc;
};
_proto.isWaiting = function isWaiting() {
return false; // Buffered handler is always synchronous
};
/**
* Get accumulated compressed data without consuming it
*/ _proto.getBuffer = function getBuffer() {
return Buffer.concat(this.chunks);
};
/**
* Clear the buffer
*/ _proto.clearBuffer = function clearBuffer() {
this.chunks = [];
};
_proto.destroy = function destroy() {
this.chunks = [];
this.runningCrc = 0;
};
return DeflateBufferHandler;
}();
/* 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; }