Function parsePath

tar/tar_stream.ts:595–629

(size: number, buffer: Uint8Array_)

}

function parsePath(size: number, buffer: Uint8Array_): void {
  if (size <= 100) return;
  if (size > 256) {
    throw new RangeError(
      `Cannot parse the path as the path length cannot exceed 256 bytes: The path length is ${size}`,
    );
  }

  const sub = buffer.subarray(0, size);
  let slashPos = Math.max(0, sub.lastIndexOf(SLASH_CODE_POINT));
  if (size - slashPos > 100) {
    throw new RangeError(
      `Cannot parse the path as the file cannot exceed 100 bytes: The filename length is ${
        size - slashPos
      }`,
    );
  }

  for (let pos = slashPos; pos > 0; slashPos = pos) {
    pos = sub.lastIndexOf(SLASH_CODE_POINT, slashPos - 1);
    if (size - pos > 100) break;
  }

  const prefix = sub.subarray(0, slashPos);
  if (prefix.length > 155) {
    throw new TypeError(
      "Cannot parse the path as the path needs to be split-able on a forward slash separator into [155, 100] bytes respectively",
    );
  }
  buffer.set(prefix, 345);
  buffer.subarray(345 + prefix.length, 500).fill(0);
  const name = sub.subarray(slashPos + 1);
  buffer.set(name);
  buffer.subarray(name.length, 100).fill(0);
}

/**
 * Asserts that the path provided is valid for a {@linkcode TarStream}.