feat: simple codec support float32

packages/util/src/dynamic-buffer.ts

@@ -27,6 +27,12 @@ export class DynamicBuffer {
         this.size_ += 4
     }
 
+    public writeFloat32(value: number) {
+        this.ensureAppend(4)
+        new DataView(this.data_.buffer).setFloat32(this.size_, value, true)
+        this.size_ += 4
+    }
+
     public writeString(value: string) {
         const data = new TextEncoder().encode(value)
 

packages/util/src/float.ts

@@ -0,0 +1,4 @@
+export class Float {
+    public static kZero = new Float(0)
+    public constructor(public readonly value: number) {}
+}

packages/util/src/simple-codec.test.ts

@@ -1,3 +1,4 @@
+import { Float } from './float'
 import { encode, decode } from './simple-codec'
 
 interface TestObject {
@@ -35,6 +36,10 @@ describe('SimpleBuffer', () => {
         expect(decode<number>(encode(2147483647), 0)).toBe(2147483647)
     })
 
+    it('float32', () => {
+        expect(decode<Float>(encode(new Float(1.25)), Float.kZero)).toStrictEqual(new Float(1.25))
+    })
+
     it('string', () => {
         expect(decode<string>(encode('hello🌎𠮷'), '')).toBe('hello🌎𠮷')
     })

packages/util/src/simple-codec.ts

@@ -1,4 +1,5 @@
 import { DynamicBuffer } from './dynamic-buffer'
+import { Float } from './float'
 
 export function encode(value: unknown): Uint8Array {
     const buffer = new DynamicBuffer()
@@ -18,6 +19,8 @@ function encodeToBuffer(buffer: DynamicBuffer, value: unknown) {
         for (const element of value) {
             encodeToBuffer(buffer, element)
         }
+    } else if (value instanceof Float) {
+        buffer.writeFloat32(value.value)
     } else if (typeof value == 'object' && value != null) {
         for (const element of Object.values(value)) {
             encodeToBuffer(buffer, element)
@@ -69,6 +72,8 @@ function decodeFromBuffer<T>(buffer: DataView, offset: number, dummy: T): [T, nu
         }
 
         return [result as T, read]
+    } else if (dummy instanceof Float) {
+        return [new Float(buffer.getFloat32(offset, true)) as T, 4]
     } else if (typeof dummy == 'object' && dummy != null) {
         const result = {}
         let read = 0