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Fix docx import crash on large files by chunking base64 encoding

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btoa(String.fromCharCode(...new Uint8Array(buf))) exceeds V8's function
argument stack limit for files larger than ~65k bytes. Process in 8k
chunks instead to handle any file size.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
This commit is contained in:
nmemmertandClaude Sonnet 4.6 committed 2026-07-29 17:23:03 -04:00
1 parent b048f51d46
commit dcfb49585d
1 file changed
+6 -1
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public/admin.js
+6 -1
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@@ -611,7 +611,12 @@ $('#import-go-btn').addEventListener('click', async () => {
$('#import-status').textContent = '🔍 Extracting content… this may take a minute.'; $('#import-status').textContent = '🔍 Extracting content… this may take a minute.';
try { try {
const arrayBuffer = await file.arrayBuffer(); const arrayBuffer = await file.arrayBuffer();
const base64 = btoa(String.fromCharCode(...new Uint8Array(arrayBuffer))); const bytes = new Uint8Array(arrayBuffer);
let binary = '';
for (let i = 0; i < bytes.length; i += 8192) {
binary += String.fromCharCode(...bytes.subarray(i, Math.min(i + 8192, bytes.length)));
}
const base64 = btoa(binary);
const result = await api('/api/admin/import-docx', { method: 'POST', body: { base64, mode } }); const result = await api('/api/admin/import-docx', { method: 'POST', body: { base64, mode } });
if (!$('#ie-title').value && result.title) $('#ie-title').value = result.title; if (!$('#ie-title').value && result.title) $('#ie-title').value = result.title;
if (mode === 'quiz' && result.questions) { if (mode === 'quiz' && result.questions) {