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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 = new Uint8Array(bytes); | |
| return read(buffer, 0, true, SINGLE_PRECISION_MANTISSA, NUMBER_OF_BYTE_F32); | |
| } | |
| export function decodeF64(bytes: Array<Byte>): number { | |
| const buffer = new Uint8Array(bytes); | |
| return read(buffer, 0, true, DOUBLE_PRECISION_MANTISSA, NUMBER_OF_BYTE_F64); | |
| } | |