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47 lines
1.1 KiB
47 lines
1.1 KiB
// @flow |
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import { write, read } from "@xtuc/ieee754"; |
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/** |
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* According to https://webassembly.github.io/spec/binary/values.html#binary-float |
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* n = 32/8 |
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*/ |
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export const NUMBER_OF_BYTE_F32 = 4; |
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/** |
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* According to https://webassembly.github.io/spec/binary/values.html#binary-float |
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* n = 64/8 |
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*/ |
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export const NUMBER_OF_BYTE_F64 = 8; |
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export const SINGLE_PRECISION_MANTISSA = 23; |
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export const DOUBLE_PRECISION_MANTISSA = 52; |
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export function encodeF32(v: number): Array<number> { |
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const buffer = []; |
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write(buffer, v, 0, true, SINGLE_PRECISION_MANTISSA, NUMBER_OF_BYTE_F32); |
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return buffer; |
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} |
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export function encodeF64(v: number): Array<number> { |
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const buffer = []; |
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write(buffer, v, 0, true, DOUBLE_PRECISION_MANTISSA, NUMBER_OF_BYTE_F64); |
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return buffer; |
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} |
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export function decodeF32(bytes: Array<Byte>): number { |
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const buffer = Buffer.from(bytes); |
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return read(buffer, 0, true, SINGLE_PRECISION_MANTISSA, NUMBER_OF_BYTE_F32); |
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} |
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export function decodeF64(bytes: Array<Byte>): number { |
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const buffer = Buffer.from(bytes); |
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return read(buffer, 0, true, DOUBLE_PRECISION_MANTISSA, NUMBER_OF_BYTE_F64); |
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}
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