node-apk/build/lib/zip.js

A library to parse Android application manifest and signature

"use strict";
/*Copyright (c) 2019 XdevL. All rights reserved.

This work is licensed under the terms of the MIT license.
For a copy, see <https://opensource.org/licenses/MIT>.*/
var __importDefault = (this && this.__importDefault) || function (mod) {
    return (mod && mod.__esModule) ? mod : { "default": mod };
};
Object.defineProperty(exports, "__esModule", { value: true });
exports.ZipEntry = void 0;
var zlib_1 = __importDefault(require("zlib"));
var source_1 = __importDefault(require("./source"));
var Signature;
(function (Signature) {
    Signature[Signature["CENTRAL_HEADER"] = 33639248] = "CENTRAL_HEADER";
    Signature[Signature["LOCAL_HEADER"] = 67324752] = "LOCAL_HEADER";
})(Signature || (Signature = {}));
var Algorithm;
(function (Algorithm) {
    Algorithm[Algorithm["DEFLATE"] = 8] = "DEFLATE";
    Algorithm[Algorithm["NONE"] = 0] = "NONE";
})(Algorithm || (Algorithm = {}));
var ZipEntry = /** @class */ (function () {
    function ZipEntry(buffer, source, signature) {
        if (signature === void 0) { signature = Signature.CENTRAL_HEADER; }
        this.buffer = buffer;
        this.signature = source.readUInt();
        if (this.signature !== signature) {
            throw Error("Invalid file header signature found: 0x".concat(this.signature.toString(16)));
        }
        this.versionMadeBy = this.signature === Signature.CENTRAL_HEADER ? source.readUShort() : 0;
        this.extractVersion = source.readUShort();
        this.flags = source.readUShort();
        this.compressionMethod = source.readUShort();
        this.time = source.readUShort();
        this.date = source.readUShort();
        this.crc32 = source.readUInt();
        this.compressedSize = source.readUInt();
        this.unCompressedSize = source.readUInt();
        this.nameLength = source.readUShort();
        this.extraLength = source.readUShort();
        this.commentLength = this.signature === Signature.CENTRAL_HEADER ? source.readUShort() : 0;
        this.diskNumber = this.signature === Signature.CENTRAL_HEADER ? source.readUShort() : 0;
        this.internalAttributes = this.signature === Signature.CENTRAL_HEADER ? source.readUShort() : 0;
        this.externalAttributes = this.signature === Signature.CENTRAL_HEADER ? source.readUInt() : 0;
        this.offset = this.signature === Signature.CENTRAL_HEADER ? source.readUInt() : 0;
        this.name = source.readUtf8String(this.nameLength);
        source.getCursorAndMove(this.extraLength + this.commentLength);
    }
    ZipEntry.lookup = function (loader, key) {
        return ZipEntry.index(loader).then(function (map) {
            var entry = map.get(key);
            if (entry) {
                return entry;
            }
            else {
                throw Error("Entry not found: " + key);
            }
        });
    };
    ZipEntry.index = function (loader) {
        return loader().then(function (buffer) {
            var index = buffer.lastIndexOf("504B0506", undefined, "hex");
            if (index < 0) {
                throw Error("End of central directory not found");
            }
            var source = new source_1.default(buffer.slice(index + 10));
            var count = source.readUShort();
            var size = source.readUInt();
            var offset = source.readUInt();
            var directory = new source_1.default(buffer.slice(offset, offset + size));
            var map = new Map();
            for (var i = 0; i < count; ++i) {
                var entry = new ZipEntry(buffer, directory);
                map.set(entry.name, entry);
            }
            return map;
        });
    };
    ZipEntry.prototype.stream = function () {
        var source = new source_1.default(this.buffer);
        source.moveAt(this.offset);
        var local = new ZipEntry(this.buffer, source, Signature.LOCAL_HEADER);
        var stream = source.stream(this.compressedSize);
        if (local.compressionMethod === Algorithm.DEFLATE) {
            return stream.pipe(zlib_1.default.createInflateRaw());
        }
        else if (local.compressionMethod === Algorithm.NONE) {
            return stream;
        }
        else {
            throw Error("Unsupported compression method: 0x".concat(this.compressionMethod.toString(16)));
        }
    };
    return ZipEntry;
}());
exports.ZipEntry = ZipEntry;