@polkadot/util/u8a/toFloat.js

// Copyright 2017-2022 @polkadot/util authors & contributors
// SPDX-License-Identifier: Apache-2.0

/**
 * @name u8aToFloat
 * @description Converts a Uint8Array value into the float (either 32 or 64-bit)
 * representation.
 */
export function u8aToFloat(value, {
  bitLength = 32,
  isLe = true
} = {}) {
  if (bitLength !== 32 && bitLength !== 64) {
    throw new Error('Invalid bitLength provided, expected 32 or 64');
  } else if (value.length < bitLength / 8) {
    throw new Error(`Invalid input buffer provided, expected at least ${bitLength / 8} bytes, found ${value.length}`);
  }

  const dv = new DataView(value.buffer, value.byteOffset);
  return bitLength === 32 ? dv.getFloat32(0, isLe) : dv.getFloat64(0, isLe);
}