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-rw-r--r--extension/background.js45
1 files changed, 33 insertions, 12 deletions
diff --git a/extension/background.js b/extension/background.js
index 3132f48..c593866 100644
--- a/extension/background.js
+++ b/extension/background.js
@@ -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);