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extension: move toward unified base64-encoded utf8 bufs

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title and url work, but not text?
This commit is contained in:
Omar Rizwan 2020-12-04 09:58:09 -08:00
parent 22aaeaa9e1
commit c826e20365
1 changed files with 33 additions and 12 deletions
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45
extension/background.js
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@ -40,6 +40,33 @@ function pathComponent(path, i) {
return components[i >= 0 ? i : components.length + i];
}
function sanitize(s) { return s.replace(/[^A-Za-z0-9_\-\.]/gm, '_'); }
function utf8(str, offset, size) {
// converts to UTF8, then takes slice
var utf8 = [];
for (var i=0; i < str.length; i++) {
var charcode = str.charCodeAt(i);
if (charcode < 0x80) utf8.push(charcode);
else if (charcode < 0x800) {
utf8.push(0xc0 | (charcode >> 6),
0x80 | (charcode & 0x3f));
}
else if (charcode < 0xd800 || charcode >= 0xe000) {
utf8.push(0xe0 | (charcode >> 12),
0x80 | ((charcode>>6) & 0x3f),
0x80 | (charcode & 0x3f));
}
// surrogate pair
else {
i++;
charcode = ((charcode&0x3ff)<<10)|(str.charCodeAt(i)&0x3ff)
utf8.push(0xf0 | (charcode >>18),
0x80 | ((charcode>>12) & 0x3f),
0x80 | ((charcode>>6) & 0x3f),
0x80 | (charcode & 0x3f));
}
}
return String.fromCharCode(...utf8.slice(offset, offset + size))
}
function stringSize(str) {
// returns the byte length of an utf8 string
var s = str.length;
@ -106,7 +133,7 @@ function withTab(handler) {
async open({path}) { return { fh: 0 }; },
async read({path, fh, size, offset}) {
const tab = await browser.tabs.get(parseInt(pathComponent(path, -2)));
return { buf: handler(tab).substr(offset, size) };
return { buf: utf8(handler(tab), offset, size) };
}
};
}
@ -123,8 +150,8 @@ function fromScript(code) {
async open({path}) { return { fh: 0 }; },
async read({path, fh, size, offset}) {
const tabId = parseInt(pathComponent(path, -2));
return { buf: (await browser.tabs.executeScript(tabId, {code}))[0]
.substr(offset, size) }
console.log(await browser.tabs.executeScript(tabId, {code})[0]);
return { buf: utf8(await browser.tabs.executeScript(tabId, {code})[0], offset, size) }
}
};
}
@ -145,9 +172,7 @@ router["/tabs/by-id/*/screenshot.png"] = {
await sendDebuggerCommand(tabId, "Page.enable", {});
const {data} = await sendDebuggerCommand(tabId, "Page.captureScreenshot");
const arr = Uint8Array.from(atob(data), c => c.charCodeAt(0));
const slice = arr.slice(offset, offset + size);
return { buf: String.fromCharCode(...slice) };
return { buf: utf8(atob(data), offset, size) };
}
};
router["/tabs/by-id/*/resources"] = {
@ -211,11 +236,7 @@ router["/tabs/by-id/*/resources/*"] = {
frameId: frameTree.frame.id,
url: resource.url
});
if (base64Encoded) {
const buf = btoa(atob(content).substr(offset, size));
return { buf, base64Encoded: true };
}
return content.substr(offset, size);
return { buf: utf8(base64Encoded ? atob(content) : content, offset, size) };
}
}
throw new UnixError(unix.ENOENT);
@ -379,7 +400,7 @@ async function onMessage(req) {
try {
response = await findRoute(req.path)[req.op](req);
response.op = req.op;
if (response.buf) response.buf = btoa(response.buf);
if (response.buf) { response.buf = btoa(response.buf); }
} catch (e) {
console.error(e);