Function calcLength

cbor/_common_decode.ts:7–24

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

import type { CborType } from "./types.ts";

function calcLength(
  input: Uint8Array,
  aI: number,
  offset: number,
): [number | bigint, number] {
  if (aI < 24) return [aI, offset];
  const view = new DataView(input.buffer, input.byteOffset, input.byteLength);
  switch (aI) {
    case 24:
      return [view.getUint8(offset), offset + 1];
    case 25:
      return [view.getUint16(offset), offset + 2];
    case 26:
      return [view.getUint32(offset), offset + 4];
    default: // Only possible for it to be 27
      return [view.getBigUint64(offset), offset + 8];
  }
}

export function decode(input: Uint8Array, offset: number): [CborType, number] {
  const byte = input[offset++];