justjavac / deno_ieee754

Parse IEEE754 floating point numbers for Deno

deno_ieee754

Parse IEEE754 floating point numbers for Deno.

Usage

import * as ieee754 from "https://deno.land/x/ieee754/mod.ts";
// or
// import read from "https://deno.land/x/ieee754/read.ts";
// import write from "https://deno.land/x/ieee754/write.ts";

const buf: Uint8Array = Uint8Array.of(0x42, 0x29, 0xae, 0x14);
const f64 = ieee754.read(buf, 0, false, 52, 8);
console.log(f64); // 42.42

const EPSILON = 0.00001;
const f32 = ieee754.read(buf, 0, false, 23, 4);
console.log(Math.abs(f32 - 42.42) < EPSILON); // true

Use with number array:

const arr: number[] = [1, 2, 3]; // a number array
const buf = Uint8Array.from(arr); // convert to `Uint8Array`
const num = ieee754.read(buf, 0, false, 23, 4);

APIs

read:

/**
 * Read IEEE754 floating point numbers from a array.
 * @param buffer the buffer
 * @param offset offset into the buffer
 * @param isLE is little endian?
 * @param mLen mantissa length
 * @param nBytes number of bytes
 */
function read(
  buffer: Uint8Array,
  offset: number,
  isLE: boolean,
  mLen: number,
  nBytes: number,
): number;

write:

/**
 * Write IEEE754 floating point numbers to a array.
 * @param buffer the buffer
 * @param value value to set
 * @param offset offset into the buffer
 * @param isLE is little endian?
 * @param mLen mantissa length
 * @param nBytes number of bytes
 */
function write(
  buffer: Uint8Array,
  value: number,
  offset: number,
  isLE: boolean,
  mLen: number,
  nBytes: number,
): void;

License

deno_ieee754 is released under the MIT License. See the bundled LICENSE file for details.