feat: add encodeFloat decodeFloat to typescript

app/src/lib/helpers/encode.ts

@@ -0,0 +1,34 @@
+
+export function encodeFloat(f: number): [number, number] {
+  let buffer = new ArrayBuffer(4); // Create a buffer of 4 bytes (32 bits)
+  let floatView = new Float32Array(buffer);
+  let intView = new Uint32Array(buffer);
+
+  floatView[0] = f; // Store the float into the buffer
+  let bits = intView[0]; // Read the bits as integer
+
+  let mantissa = bits & 0x007FFFFF;
+  let exponent = (bits >> 23) & 0xFF;
+  let sign = (f < 0.0) ? 1 : 0;
+
+  // Include the sign bit in the mantissa
+  mantissa = mantissa | (sign << 23);
+
+  return [mantissa, exponent];
+}
+
+export function decodeFloat(mantissa: number, exponent: number): number {
+  let signBit = (mantissa >> 23) & 1;
+  let mantissaBits = mantissa & 0x007FFFFF;
+  let exponentBits = (exponent & 0xFF) << 23;
+
+  // Reconstruct all bits including sign
+  let bits = (signBit << 31) | exponentBits | mantissaBits;
+
+  let buffer = new ArrayBuffer(4);
+  let floatView = new Float32Array(buffer);
+  let intView = new Uint32Array(buffer);
+
+  intView[0] = bits; // Set the bits as integer
+  return floatView[0]; // Read the float back from the buffer
+}