Chunk resources.tar into 50MB chunks for jsDelivr.

Co-authored-by: Catherine <[email protected]>

Author: kokjo

bin/pack-resources.js

@@ -67,9 +67,17 @@ for (const dirent of await readdir(wasmDirectory, { withFileTypes: true })) {
 output += `\
 });
 
-const filesystem = async (fetch) => ({
+const filesystem = async (fetch) => {
+    var chunks = [];
 `;
 
+function* chunks(data, length) {
+    while (data.length != 0) {
+        yield data.subarray(0, length);
+        data = data.subarray(length);
+    }
+}
+
 if (shareDirectory !== undefined) {
     const tarEntries = [];
     async function archivePath(pathName) {
@@ -89,19 +97,25 @@ if (shareDirectory !== undefined) {
     }
     await archivePath(shareDirectory);
     const tarData = createTar(tarEntries);
-    const tarFilePath = resourceFilePath.replace(/\.js$/, '.tar');
-    await writeFile(tarFilePath, tarData);
-
-    const tarFileName = tarFilePath.replace(/^.+\//, '');
+    var i = 0;
+    for(const chunk of chunks(tarData, 50*1024*1024)) {
+        const tarFileChunkPath = resourceFilePath.replace(/\.js$/, `.${i}.tar`);
+        await writeFile(tarFileChunkPath, chunk);
+        const tarFileChunkName = tarFileChunkPath.replace(/^.+\//, '');
+        output += `\
+    chunks.push(await ${await fetchExpr(tarFileChunkPath, `./${tarFileChunkName}`)}.then((resp) => resp.arrayBuffer()));
+`
+        i += 1;
+    }
     output += `\
-    ${JSON.stringify(shareRoot)}: await ${await fetchExpr(tarFilePath, `./${tarFileName}`)}
-        .then((resp) => resp.arrayBuffer())
-        .then(unpackTarFilesystem)
+    return {
+        ${JSON.stringify(shareRoot)}: await new Blob(chunks).arrayBuffer().then(unpackTarFilesystem)
+    };
 `;
 }
 
 output += `\
-});
+};
 
 const totalSize = ${totalSize};