Factored out package helper class for examples

examples/package.js

@@ -0,0 +1,95 @@
+/*
+* Web Bluetooth DFU
+* Copyright (c) 2018 Rob Moran
+*
+* The MIT License (MIT)
+*
+* Permission is hereby granted, free of charge, to any person obtaining a copy
+* of this software and associated documentation files (the "Software"), to deal
+* in the Software without restriction, including without limitation the rights
+* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+* copies of the Software, and to permit persons to whom the Software is
+* furnished to do so, subject to the following conditions:
+*
+* The above copyright notice and this permission notice shall be included in all
+* copies or substantial portions of the Software.
+*
+* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+* SOFTWARE.
+*/
+
+// https://github.com/umdjs/umd
+(function (root, factory) {
+    if (typeof define === "function" && define.amd) {
+        // AMD. Register as an anonymous module.
+        define(["jszip"], factory);
+    } else if (typeof exports === "object") {
+        // Node. Does not work with strict CommonJS
+        module.exports = factory(require("jszip"));
+    } else {
+        // Browser globals with support for web workers (root is window)
+        root.SecureDfuPackage = factory(root.JSZip);
+    }
+}(this, function(JSZip) {
+    "use strict";
+
+    function Package(buffer) {
+        this.buffer = buffer;
+        this.zipFile = null;
+        this.manifest = null;
+    };
+
+    Package.prototype.load = function() {
+        try {
+            return JSZip.loadAsync(this.buffer)
+            .then(zipFile => {
+                this.zipFile = zipFile;
+                return this.zipFile.file("manifest.json").async("string");
+            })
+            .then(content => {
+                this.manifest = JSON.parse(content).manifest;
+                return this;
+            });
+        } catch(e) {
+            throw new Error("Unable to find manifest, is this a proper DFU package?");
+        }
+    };
+
+    Package.prototype.getImage = function(types) {
+        for (var type of types) {
+            if (this.manifest[type]) {
+                var entry = this.manifest[type];
+                var result = {
+                    type: type,
+                    initFile: entry.dat_file,
+                    imageFile: entry.bin_file
+                };
+    
+                return this.zipFile.file(result.initFile).async("arraybuffer")
+                .then(data => {
+                    result.initData = data;
+                    return this.zipFile.file(result.imageFile).async("arraybuffer")
+                })
+                .then(data => {
+                    result.imageData = data;
+                    return result;
+                });
+            }
+        }
+    };
+
+    Package.prototype.getBaseImage = function() {
+        return this.getImage(["softdevice", "bootloader", "softdevice_bootloader"]);
+    };
+
+    Package.prototype.getAppImage = function() {
+        return this.getImage(["application"]);
+    };
+
+    return Package;
+}));