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index.js
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Created: Sun, Dec 15, 02:04

index.js
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	// @flow

	import { write, read } from "@xtuc/ieee754";

	/**
	* According to https://webassembly.github.io/spec/binary/values.html#binary-float
	* n = 32/8
	*/
	export const NUMBER_OF_BYTE_F32 = 4;

	/**
	* According to https://webassembly.github.io/spec/binary/values.html#binary-float
	* n = 64/8
	*/
	export const NUMBER_OF_BYTE_F64 = 8;

	export const SINGLE_PRECISION_MANTISSA = 23;

	export const DOUBLE_PRECISION_MANTISSA = 52;

	export function encodeF32(v: number): Array<number> {
	const buffer = [];

	write(buffer, v, 0, true, SINGLE_PRECISION_MANTISSA, NUMBER_OF_BYTE_F32);

	return buffer;
	}

	export function encodeF64(v: number): Array<number> {
	const buffer = [];

	write(buffer, v, 0, true, DOUBLE_PRECISION_MANTISSA, NUMBER_OF_BYTE_F64);

	return buffer;
	}

	export function decodeF32(bytes: Array<Byte>): number {
	const buffer = Buffer.from(bytes);

	return read(buffer, 0, true, SINGLE_PRECISION_MANTISSA, NUMBER_OF_BYTE_F32);
	}

	export function decodeF64(bytes: Array<Byte>): number {
	const buffer = Buffer.from(bytes);

	return read(buffer, 0, true, DOUBLE_PRECISION_MANTISSA, NUMBER_OF_BYTE_F64);
	}

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