ripple-binary-codec refactor (#88)

Refactored all components in ripple-binary-codec /src

packages/ripple-binary-codec/src/quality.ts

@@ -1,23 +1,37 @@
-const Decimal = require("decimal.js");
-import { bytesToHex, slice, parseBytes } from "./utils/bytes-utils";
 import { coreTypes } from "./types";
+import { Decimal } from "decimal.js";
 
-module.exports = {
-  encode(arg) {
-    const quality = arg instanceof Decimal ? arg : new Decimal(arg);
-    const exponent = quality.e - 15;
-    const qualityString = quality
-      .times("1e" + -exponent)
-      .abs()
-      .toString();
+/**
+ * class for encoding and decoding quality
+ */
+class quality {
+  /**
+   * Encode quality amount
+   *
+   * @param arg string representation of an amount
+   * @returns Serialized quality
+   */
+  static encode(quality: string): Buffer {
+    const decimal = new Decimal(quality);
+    const exponent = decimal.e - 15;
+    const qualityString = decimal.times(`1e${-exponent}`).abs().toString();
     const bytes = coreTypes.UInt64.from(BigInt(qualityString)).toBytes();
     bytes[0] = exponent + 100;
     return bytes;
-  },
-  decode(arg) {
-    const bytes = slice(parseBytes(arg), -8);
+  }
+
+  /**
+   * Decode quality amount
+   *
+   * @param arg hex-string denoting serialized quality
+   * @returns deserialized quality
+   */
+  static decode(quality: string): Decimal {
+    const bytes = Buffer.from(quality, "hex").slice(-8);
     const exponent = bytes[0] - 100;
-    const mantissa = new Decimal("0x" + bytesToHex(slice(bytes, 1)));
-    return mantissa.times("1e" + exponent);
-  },
-};
+    const mantissa = new Decimal(`0x${bytes.slice(1).toString("hex")}`);
+    return mantissa.times(`1e${exponent}`);
+  }
+}
+
+export { quality };