chunk (png)

Assembles a PNG chunk with length, type, data, and CRC32 checksum over type and data.

function chunk(type: string, data: Uint8Array): Uint8Array {
  const typeB = TYPE_BYTES(type);
  const crcSrc = concat([typeB, data]);
  return concat([u32be(data.length), typeB, data, u32be(crc32(crcSrc))]);
}