add wasm poly offsetting

js/add-class.js

@@ -0,0 +1,116 @@
+class DataWriter {
+    constructor(view, pos) {
+        this.view = view;
+        this.pos = pos || 0;
+    }
+
+    skip(v) {
+        let p = this.pos;
+        this.pos += v;
+        return p;
+    }
+
+    writeU8(v) {
+        try {
+            this.view.setUint8(this.pos, v);
+            return this.skip(1);
+        } catch (err) {
+            console.log({pos:this.pos, err})
+            throw err;
+        }
+    }
+
+    writeU16(v,le) {
+        this.view.setUint16(this.pos, v, le);
+        return this.skip(2);
+    }
+
+    writeU32(v,le) {
+        this.view.setUint32(this.pos, v, le);
+        return this.skip(4);
+    }
+
+    writeI32(v,le) {
+        this.view.setInt32(this.pos, v, le);
+        return this.skip(4);
+    }
+
+    writeUB64(v,le) {
+        this.view.setBigUint64(this.pos, v, le);
+        return this.skip(8);
+    }
+
+    writeB64(v,le) {
+        this.view.setBigInt64(this.pos, v, le);
+        return this.skip(8);
+    }
+
+    writeF32(v,le) {
+        this.view.setFloat32(this.pos, v, le);
+        return this.skip(4);
+    }
+
+    writeF64(v,le) {
+        this.view.setFloat64(this.pos, v, le);
+        return this.skip(8);
+    }
+}
+
+class DataReader {
+    constructor(view, pos) {
+        this.view = view;
+        this.pos = pos || 0;
+    }
+
+    skip(v) {
+        let p = this.pos;
+        this.pos += v;
+        return p;
+    }
+
+    readU8() {
+        return this.view.getUint8(this.pos++);
+    }
+
+    readU16(le) {
+        let v = this.view.getUint16(this.pos, le);
+        this.pos += 2;
+        return v;
+    }
+
+    readU32(le) {
+        let v = this.view.getUint32(this.pos, le);
+        this.pos += 4;
+        return v;
+    }
+
+    readI32(le) {
+        let v = this.view.getInt32(this.pos, le);
+        this.pos += 4;
+        return v;
+    }
+
+    readB64(le) {
+        let v = this.view.getBigInt64(this.pos, le);
+        this.pos += 8;
+        return v;
+    }
+
+    readUB64(le) {
+        let v = this.view.getBigUint64(this.pos, le);
+        this.pos += 8;
+        return v;
+    }
+
+    readF32(le) {
+        let v = this.view.getFloat32(this.pos, le);
+        this.pos += 4;
+        return v;
+    }
+
+    readF64(le) {
+        let v = this.view.getFloat64(this.pos, le);
+        this.pos += 8;
+        return v;
+    }
+}