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Experimental deflate ZLIB based b64 encoding #6

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Experimental deflate ZLIB based b64 encoding #6

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19 changes: 8 additions & 11 deletions serial.js
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Original file line number Diff line number Diff line change
@@ -1,3 +1,5 @@
import { encode } from 'https://esm.run/buffer-to-base64/encode';

const CONTROL_A = '\x01';
const CONTROL_B = '\x02';
const CONTROL_C = '\x03';
Expand Down Expand Up @@ -430,14 +432,6 @@ export default function Board({
upload: async (path, content, onprogress = noop) => {
if (port && !evaluating) {
const { stringify } = JSON;
const { fromCharCode } = String;

const base64 = view => {
const b64 = '';
for (let args = 2000, i = 0; i < view.length; i += args)
b64 += fromCharCode(...view.slice(i, i + args));
return btoa(b64);
};

const update = (i, length) => {
onprogress(i, length);
Expand All @@ -450,11 +444,14 @@ export default function Board({
new Uint8Array(await content.arrayBuffer())
;

const bytes = `binascii.a2b_base64(${stringify(await encode(view))})`;
const code = dedent(`
with open(${stringify(path)},"wb") as f:
import binascii
f.write(binascii.a2b_base64("${base64(view)}"))
f.close()
import binascii, deflate, io
with deflate.DeflateIO(io.BytesIO(${bytes}), deflate.ZLIB) as d:
f.write(d.read())
f.close()
d.close()
`);

let i = 0, { length } = code;
Expand Down