hfp-js - npm Package Compare versions

Comparing version 1.0.0 to 1.0.1

package.json

 {
   "name": "hfp-js",
-  "version": "1.0.0",
+  "version": "1.0.1",
   "description": "",
@@ -5,0 +5,0 @@ "main": "dist/index.js",

src/index.ts

@@ -1,25 +0,32 @@
-export function HfpBinStringToFloat32 (str: string): number | Error {
+export function HfpBinStringToFloat (str: string): number | Error {
   if(str.length !== 32) return Error('Requires a 32 bit binary number')
-  let bin: number = parseInt(str, 2)
-
-  const sign: number = bin >>> 31 ? -1 : 1;  
-  let exp: number = (bin >>> 24 & 0x7f) - 64;
+  let bin: number = parseInt(str, 2) | 0;
   
-  // mask off the first 8 bits (those aren't used)
-  // convert the last 24 bits
-  let mantissa:string = (bin & 0xffffff).toString(2)
-
-  // converting from number to string in js loses leading 0s
-  // also, this is a decimal, so we have a 24 bit number, but we need 25 bit decimal
-  // we pad left until we reach the desired 25 bits
-  while (mantissa.length < 25) {
-    mantissa = `0`+ mantissa
+  let exp: number = -1;
+  let mantissa: number = bin & 0xffffff;
+  // protect against zeros
+  if (mantissa == 0) return bin < 0 ? -0 : 0;
+  while (mantissa < 0x800000) {
+    mantissa <<= 1; exp--;
   }
+  exp += 4 * (((bin >> 24) & 0x7f) - 64);
+  const sign: number = bin & 0x80000000
+  const f1: number = sign | ((exp + 1023) << 20) | ((mantissa & ~0x800000) >> 3);
+  const f0: number = (mantissa & ~0x800000) << 29;
+  return new Float64Array(new Int32Array([f0, f1]).buffer)[0];
+}
 
-  let float32: number = 0
-  for (let i:number = 0; Math.abs(i) < mantissa.length - 1; i -= 1) {
-    float32 += parseInt(mantissa[Math.abs(i)], 2) * Math.pow(2, i)
+export function HfpBinToFloat (bin: number): number | Error {
+  let exp: number = -1;
+  let mantissa: number = bin & 0xffffff;
+  // protect against zeros
+  if (mantissa == 0) return bin < 0 ? -0 : 0;
+  while (mantissa < 0x800000) {
+    mantissa <<= 1; exp--;
   }
-
-  return float32 * sign * Math.pow(16, exp);
+  exp += 4 * (((bin >> 24) & 0x7f) - 64);
+  const sign: number = bin & 0x80000000
+  const f1: number = sign | ((exp + 1023) << 20) | ((mantissa & ~0x800000) >> 3);
+  const f0: number = (mantissa & ~0x800000) << 29;
+  return new Float64Array(new Int32Array([f0, f1]).buffer)[0];
 }

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Improved metrics

Total package byte prevSize

1999

increased by19.06%

Lines of code

29

increased by52.63%

No dependency changes