Function decodeThree

cbor/_common_decode.ts:122–173

(
  input: Uint8Array,
  aI: number,
  offset: number,
)

}

function decodeThree(
  input: Uint8Array,
  aI: number,
  offset: number,
): [string, number] {
  if (aI < 24) {
    return [
      new TextDecoder().decode(input.subarray(offset, offset + aI)),
      offset + aI,
    ];
  }
  if (aI <= 27) {
    const x = calcLength(input, aI, offset);
    const start = x[1];
    const end = Number(x[0]) + x[1];
    return [new TextDecoder().decode(input.subarray(start, end)), end];
  }
  if (aI === 31) {
    let byte = input[offset++];
    if (byte == undefined) throw new RangeError("More bytes were expected");
    const output: Uint8Array[] = [];
    while (byte !== 0b111_11111) {
      if (byte >> 5 !== 3) {
        throw new TypeError(
          `Cannot decode value (0b${(byte >> 5).toString(2).padStart(3, "0")}_${
            (byte & 0b11111).toString(2).padStart(5, "0")
          }) inside an indefinite length text string`,
        );
      }
      const aI = byte & 0b000_11111;
      if (aI === 31) {
        throw new TypeError(
          "Indefinite length text strings cannot contain indefinite length text strings",
        );
      }
      if (aI > 27) {
        throw new RangeError(
          `Cannot decode value (0b011_${aI.toString(2).padStart(5, "0")})`,
        );
      }
      const x = decodeTwo(input, aI, offset);
      output.push(x[0]);
      offset = x[1];
      byte = input[offset++];
      if (byte == undefined) throw new RangeError("More bytes were expected");
    }
    return [new TextDecoder().decode(concat(output)), offset + 1];
  }
  throw new RangeError(
    `Cannot decode value (0b011_${aI.toString(2).padStart(5, "0")})`,
  );
}

function decodeFour(
  input: Uint8Array,