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BangleApps
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Evaluate images before they get to Bangle.js

master
Gordon Williams 2021-07-28 16:30:16 +01:00
parent 6d73d175eb
commit d551e9d78c
1 changed files with 60 additions and 0 deletions
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60
bin/build_bangle2_c.js
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@ -30,6 +30,42 @@ global.Const = {
SINGLE_APP_ONLY : false,
};
function atob(input) {
// Copied from https://github.com/strophe/strophejs/blob/e06d027/src/polyfills.js#L149
// This code was written by Tyler Akins and has been placed in the
// public domain. It would be nice if you left this header intact.
// Base64 code from Tyler Akins -- http://rumkin.com
var keyStr = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=';
var output = [];
var chr1, chr2, chr3;
var enc1, enc2, enc3, enc4;
var i = 0;
// remove all characters that are not A-Z, a-z, 0-9, +, /, or =
input = input.replace(/[^A-Za-z0-9\+\/\=]/g, '');
do {
enc1 = keyStr.indexOf(input.charAt(i++));
enc2 = keyStr.indexOf(input.charAt(i++));
enc3 = keyStr.indexOf(input.charAt(i++));
enc4 = keyStr.indexOf(input.charAt(i++));
chr1 = (enc1 << 2) | (enc2 >> 4);
chr2 = ((enc2 & 15) << 4) | (enc3 >> 2);
chr3 = ((enc3 & 3) << 6) | enc4;
output.push(chr1);
if (enc3 !== 64) {
output.push(chr2);
}
if (enc4 !== 64) {
output.push(chr3);
}
} while (i < input.length);
return new Uint8Array(output);
}
var AppInfo = require(ROOTDIR+"/core/js/appinfo.js");
var appjson = JSON.parse(fs.readFileSync(APPJSON).toString());
var appfiles = [];
@ -50,6 +86,28 @@ function fileGetter(url) {
return Promise.resolve(fs.readFileSync(url).toString("binary"));
}
// If file should be evaluated, try and do it...
function evaluateFile(file) {
var hsStart = 'require("heatshrink").decompress(atob("';
var hsEnd = '"))';
if (file.content.startsWith(hsStart) && file.content.endsWith(hsEnd)) {
var heatshrink = require(ROOTDIR+"/core/lib/heatshrink.js");
var b64 = file.content.slice(hsStart.length, -hsEnd.length);
var decompressed = heatshrink.decompress(atob(b64));
file.content = "";
for (var i=0;i<decompressed.length;i++)
file.content += String.fromCharCode(decompressed[i]);
return;
}
// if JSON just pass through. We could try and minify.
if (file.name.endsWith(".json")) {
return;
}
// else... uh-oh
console.log(file);
throw new Error("Unable to evaluate "+file.name);
}
Promise.all(APPS.map(appid => {
var app = appjson.find(app=>app.id==appid);
if (app===undefined) throw new Error(`App ${appid} not found`);
@ -63,6 +121,8 @@ Promise.all(APPS.map(appid => {
// work out what goes in storage
var storageContent = "";
appfiles.forEach((file) => {
//console.log(file);
if (file.evaluate) evaluateFile(file);
var fileLength = file.content.length;
console.log(file.name+" -> "+fileLength+"b");
// set up header