Method #parseHeaderInto

tar/tar_stream.ts:253–345

(
    input: TarStreamInput,
    buffer: Uint8Array_,
  )

  }

  #parseHeaderInto(
    input: TarStreamInput,
    buffer: Uint8Array_,
  ): void {
    input.options ??= {};
    input.options.mode ??= input.type === "file"
      ? 0o644
      : input.type === "symlink"
      ? 0o777
      : 0o755;
    input.options.uid ??= 0o0;
    input.options.gid ??= 0o0;
    input.options.mtime ??= Math.floor(Date.now() / 1000);
    input.options.uname ??= "";
    input.options.gname ??= "";
    input.options.devmajor ??= "";
    input.options.devminor ??= "";
    assertValidTarStreamOptions(input.options);
    if (
      input.type === "file" &&
      (input.size < 0 || 8 ** 12 < input.size || Number.isNaN(input.size))
    ) {
      throw new RangeError(
        "Cannot add to the tar archive: The size cannot exceed 64 Gibs",
      );
    }

    // name (100) & prefix (155)
    this.#parsePathInto(input.path, buffer);
    // mode (8)
    parseOctalInto(input.options.mode, buffer.subarray(100, 106));
    buffer[106] = 32;
    buffer[107] = 0;
    // uid (8)
    parseOctalInto(input.options.uid, buffer.subarray(108, 114));
    buffer[114] = 32;
    buffer[115] = 0;
    // gid (8)
    parseOctalInto(input.options.gid, buffer.subarray(116, 122));
    buffer[122] = 32;
    buffer[123] = 0;
    // size (12)
    const size = input.type === "file" ? input.size : 0;
    buffer[135] = 32;
    parseOctalInto(size, buffer.subarray(124, 135 + +(8 ** 11 < size)));
    // mtime (12)
    parseOctalInto(input.options.mtime, buffer.subarray(136, 147));
    buffer[147] = 32;
    // checksum (8)
    buffer.fill(32, 148, 156);
    // typeflag (1)
    buffer[156] = input.type === "file"
      ? 48
      : input.type === "symlink"
      ? 50
      : 53;
    // linkname (100)
    buffer.fill(0, 157, 257);