Website Structure

Frontend-Learner/node_modules/nanotar/dist/index.mjs

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+const TAR_TYPE_FILE = 0;
+const TAR_TYPE_DIR = 5;
+function parseTar(data, opts) {
+  const buffer = data.buffer || data;
+  const files = [];
+  let offset = 0;
+  while (offset < buffer.byteLength - 512) {
+    const name = _readString(buffer, offset, 100);
+    if (name.length === 0) {
+      break;
+    }
+    const mode = _readString(buffer, offset + 100, 8).trim();
+    const uid = Number.parseInt(_readString(buffer, offset + 108, 8));
+    const gid = Number.parseInt(_readString(buffer, offset + 116, 8));
+    const size = _readNumber(buffer, offset + 124, 12);
+    const seek = 512 + 512 * Math.trunc(size / 512) + (size % 512 ? 512 : 0);
+    const mtime = _readNumber(buffer, offset + 136, 12);
+    const _type = _readNumber(buffer, offset + 156, 1);
+    const type = _type === TAR_TYPE_FILE ? "file" : _type === TAR_TYPE_DIR ? "directory" : _type;
+    const user = _readString(buffer, offset + 265, 32);
+    const group = _readString(buffer, offset + 297, 32);
+    const meta = {
+      name,
+      type,
+      size,
+      attrs: {
+        mode,
+        uid,
+        gid,
+        mtime,
+        user,
+        group
+      }
+    };
+    if (opts?.filter && !opts.filter(meta)) {
+      offset += seek;
+      continue;
+    }
+    if (opts?.metaOnly) {
+      files.push(meta);
+      offset += seek;
+      continue;
+    }
+    const data2 = _type === TAR_TYPE_DIR ? undefined : new Uint8Array(buffer, offset + 512, size);
+    files.push({
+      ...meta,
+      data: data2,
+      get text() {
+        return new TextDecoder().decode(this.data);
+      }
+    });
+    offset += seek;
+  }
+  return files;
+}
+async function parseTarGzip(data, opts = {}) {
+  const stream = new ReadableStream({
+    start(controller) {
+      controller.enqueue(new Uint8Array(data));
+      controller.close();
+    }
+  }).pipeThrough(new DecompressionStream(opts.compression ?? "gzip"));
+  const decompressedData = await new Response(stream).arrayBuffer();
+  return parseTar(decompressedData, opts);
+}
+function _readString(buffer, offset, size) {
+  const view = new Uint8Array(buffer, offset, size);
+  const i = view.indexOf(0);
+  const td = new TextDecoder();
+  return td.decode(i === -1 ? view : view.slice(0, i));
+}
+function _readNumber(buffer, offset, size) {
+  const view = new Uint8Array(buffer, offset, size);
+  let str = "";
+  for (let i = 0; i < size; i++) {
+    str += String.fromCodePoint(view[i]);
+  }
+  return Number.parseInt(str, 8);
+}
+
+function createTar(files, opts = {}) {
+  const _files = files.map((file) => {
+    const data = _normalizeData(file.data);
+    return {
+      ...file,
+      data,
+      size: data?.length || 0
+    };
+  });
+  let tarDataSize = 0;
+  for (let i = 0; i < files.length; i++) {
+    const size = _files[i].data?.length ?? 0;
+    tarDataSize += 512 + 512 * Math.trunc(size / 512);
+    if (size % 512) {
+      tarDataSize += 512;
+    }
+  }
+  let bufSize = 10240 * Math.trunc(tarDataSize / 10240);
+  if (tarDataSize % 10240) {
+    bufSize += 10240;
+  }
+  const buffer = new ArrayBuffer(bufSize);
+  let offset = 0;
+  for (const file of _files) {
+    const isDir = !file.data;
+    _writeString(buffer, file.name, offset, 100);
+    const mode = file.attrs?.mode ?? opts.attrs?.mode ?? (isDir ? "775" : "664");
+    _writeString(buffer, _leftPad(mode, 7), offset + 100, 8);
+    const uid = file.attrs?.uid ?? opts.attrs?.uid ?? 1e3;
+    _writeString(buffer, _leftPad(uid.toString(8), 7), offset + 108, 8);
+    const gid = file.attrs?.gid ?? opts.attrs?.gid ?? 1e3;
+    _writeString(buffer, _leftPad(gid.toString(8), 7), offset + 116, 8);
+    _writeString(buffer, _leftPad(file.size.toString(8), 11), offset + 124, 12);
+    const mtime = file.attrs?.mtime ?? opts.attrs?.mtime ?? Date.now();
+    _writeString(
+      buffer,
+      _leftPad(Math.trunc(mtime / 1e3).toString(8), 11),
+      offset + 136,
+      12
+    );
+    const type = isDir ? "5" : "0";
+    _writeString(buffer, type, offset + 156, 1);
+    _writeString(
+      buffer,
+      "ustar",
+      offset + 257,
+      6
+      /* magic string */
+    );
+    _writeString(
+      buffer,
+      "00",
+      offset + 263,
+      2
+      /* magic version */
+    );
+    const user = file.attrs?.user ?? opts.attrs?.user ?? "";
+    _writeString(buffer, user, offset + 265, 32);
+    const group = file.attrs?.group ?? opts.attrs?.group ?? "";
+    _writeString(buffer, group, offset + 297, 32);
+    _writeString(buffer, "        ", offset + 148, 8);
+    const header = new Uint8Array(buffer, offset, 512);
+    let chksum = 0;
+    for (let i = 0; i < 512; i++) {
+      chksum += header[i];
+    }
+    _writeString(buffer, chksum.toString(8), offset + 148, 8);
+    if (!isDir) {
+      const destArray = new Uint8Array(buffer, offset + 512, file.size);
+      for (let byteIdx = 0; byteIdx < file.size; byteIdx++) {
+        destArray[byteIdx] = file.data[byteIdx];
+      }
+      offset += 512 * Math.trunc(file.size / 512);
+      if (file.size % 512) {
+        offset += 512;
+      }
+    }
+    offset += 512;
+  }
+  return new Uint8Array(buffer);
+}
+function createTarGzipStream(files, opts = {}) {
+  const buffer = createTar(files, opts);
+  return new ReadableStream({
+    start(controller) {
+      controller.enqueue(buffer);
+      controller.close();
+    }
+  }).pipeThrough(new CompressionStream(opts.compression ?? "gzip"));
+}
+async function createTarGzip(files, opts = {}) {
+  const data = await new Response(createTarGzipStream(files, opts)).arrayBuffer().then((buffer) => new Uint8Array(buffer));
+  return data;
+}
+function _writeString(buffer, str, offset, size) {
+  const strView = new Uint8Array(buffer, offset, size);
+  const te = new TextEncoder();
+  const written = te.encodeInto(str, strView).written;
+  for (let i = written; i < size; i++) {
+    strView[i] = 0;
+  }
+}
+function _leftPad(input, targetLength) {
+  return String(input).padStart(targetLength, "0");
+}
+function _normalizeData(data) {
+  if (data === null || data === undefined) {
+    return undefined;
+  }
+  if (typeof data === "string") {
+    return new TextEncoder().encode(data);
+  }
+  if (data instanceof ArrayBuffer) {
+    return new Uint8Array(data);
+  }
+  return data;
+}
+
+export { createTar, createTarGzip, createTarGzipStream, parseTar, parseTarGzip };