forked from zhurui/management
33 lines
1000 B
JavaScript
33 lines
1000 B
JavaScript
|
import { write, read } from "@xtuc/ieee754";
|
||
|
|
/**
|
||
|
|
* According to https://webassembly.github.io/spec/binary/values.html#binary-float
|
||
|
|
* n = 32/8
|
||
|
|
*/
|
||
|
|
|
||
|
|
export var NUMBER_OF_BYTE_F32 = 4;
|
||
|
|
/**
|
||
|
|
* According to https://webassembly.github.io/spec/binary/values.html#binary-float
|
||
|
|
* n = 64/8
|
||
|
|
*/
|
||
|
|
|
||
|
|
export var NUMBER_OF_BYTE_F64 = 8;
|
||
|
|
export var SINGLE_PRECISION_MANTISSA = 23;
|
||
|
|
export var DOUBLE_PRECISION_MANTISSA = 52;
|
||
|
|
export function encodeF32(v) {
|
||
|
|
var buffer = [];
|
||
|
|
write(buffer, v, 0, true, SINGLE_PRECISION_MANTISSA, NUMBER_OF_BYTE_F32);
|
||
|
|
return buffer;
|
||
|
|
}
|
||
|
|
export function encodeF64(v) {
|
||
|
|
var buffer = [];
|
||
|
|
write(buffer, v, 0, true, DOUBLE_PRECISION_MANTISSA, NUMBER_OF_BYTE_F64);
|
||
|
|
return buffer;
|
||
|
|
}
|
||
|
|
export function decodeF32(bytes) {
|
||
|
|
var buffer = Buffer.from(bytes);
|
||
|
|
return read(buffer, 0, true, SINGLE_PRECISION_MANTISSA, NUMBER_OF_BYTE_F32);
|
||
|
|
}
|
||
|
|
export function decodeF64(bytes) {
|
||
|
|
var buffer = Buffer.from(bytes);
|
||
|
|
return read(buffer, 0, true, DOUBLE_PRECISION_MANTISSA, NUMBER_OF_BYTE_F64);
|
||
|
|
}
|