Function decodeFive

cbor/_common_decode.ts:207–263

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

}

function decodeFive(
  input: Uint8Array,
  aI: number,
  offset: number,
): [{ [k: string]: CborType }, number] {
  if (aI <= 27) {
    const x = calcLength(input, aI, offset);
    // Can safely assume `x[0] < 2 ** 53` as JavaScript doesn't support an `Object` being that large.
    const length = Number(x[0]);
    offset = x[1];
    const output: { [k: string]: CborType } = {};
    for (let i = 0; i < length; ++i) {
      const y = decode(input, offset);
      if (typeof y[0] !== "string") {
        throw new TypeError(
          `Cannot decode key of type (${typeof y[
            0
          ]}): This implementation only supports "text string" keys`,
        );
      }
      if (output[y[0]] !== undefined) {
        throw new TypeError(
          `A Map cannot have duplicate keys: Key (${y[0]}) already exists`,
        ); // https://datatracker.ietf.org/doc/html/rfc8949#name-specifying-keys-for-maps
      }
      const z = decode(input, y[1]);
      output[y[0]] = z[0];
      offset = z[1];
    }
    return [output, offset];
  }
  if (aI === 31) {
    const output: { [k: string]: CborType } = {};
    while (input[offset] !== 0b111_11111) {
      const x = decode(input, offset);
      if (typeof x[0] !== "string") {
        throw new TypeError(
          `Cannot decode key of type (${typeof x[
            0
          ]}): This implementation only supports "text string" keys`,
        );
      }
      if (output[x[0]] !== undefined) {
        throw new TypeError(
          `A Map cannot have duplicate keys: Key (${x[0]}) already exists`,
        ); // https://datatracker.ietf.org/doc/html/rfc8949#name-specifying-keys-for-maps
      }
      const y = decode(input, x[1]);
      output[x[0]] = y[0];
      offset = y[1];
    }
    return [output, offset + 1];
  }
  throw new RangeError(
    `Cannot decode value (0b101_${aI.toString(2).padStart(5, "0")})`,
  );
}