Skip damaged TXT bytes

static/reader.js

@@ -402,7 +402,7 @@ async function renderPlainText(response) {
   const textNode = document.createTextNode(""); pre.appendChild(textNode); content.appendChild(pre);
   if (!response.body || !response.body.getReader) {
     const bytes = new Uint8Array(await response.arrayBuffer());
-    textNode.data = new TextDecoder(detectTextEncoding(bytes, title)).decode(bytes);
+    textNode.data = new TextDecoder(detectTextEncoding(bytes, title)).decode(bytes).replace(/\ufffd/g, "");
     return;
   }
   const reader = response.body.getReader(), chunks = [];
@@ -425,15 +425,15 @@ async function renderPlainText(response) {
   let pending = "", frame = 0;
   const flush = () => { frame = 0; if (pending) { textNode.appendData(pending); pending = ""; } };
   const scheduleFlush = () => { if (!frame) frame = requestAnimationFrame(flush); };
-  pending = decoder.decode(sample.subarray(displayedSampleSize), { stream: !streamDone });
+  pending = decoder.decode(sample.subarray(displayedSampleSize), { stream: !streamDone }).replace(/\ufffd/g, "");
   scheduleFlush();
   while (!streamDone) {
     const { value, done } = await reader.read();
     if (done) { streamDone = true; break; }
-    pending += decoder.decode(value, { stream: true });
+    pending += decoder.decode(value, { stream: true }).replace(/\ufffd/g, "");
     scheduleFlush();
   }
-  pending += decoder.decode();
+  pending += decoder.decode().replace(/\ufffd/g, "");
   if (frame) cancelAnimationFrame(frame);
   flush();
 }
@@ -447,7 +447,7 @@ function detectTextEncoding(bytes, hint = "") {
   if (evenNulls > bytes.length / 8 && evenNulls > oddNulls * 4) return "utf-16be";
   try { new TextDecoder("utf-8", { fatal: true }).decode(bytes, { stream: true }); return "utf-8"; } catch (_) {}
   if (/[\u0400-\u04ff]/.test(hint)) return "windows-1251";
-  const candidates = ["gb18030", "big5", "windows-1251", "windows-1252"];
+  const candidates = /[\u3400-\u9fff]/.test(hint) ? ["gb18030", "big5"] : ["gb18030", "big5", "windows-1251", "windows-1252"];
   let best = "gb18030", bestScore = -Infinity;
   for (const encoding of candidates) {
     try {