From 1e34b4487e6d76ef6d8b8b69e269490597321988 Mon Sep 17 00:00:00 2001
From: Vladimir Borovik <v.borovik@1inch.io>
Date: Wed, 31 Jul 2024 12:55:46 +0300
Subject: [PATCH] feat: add hexToUint8Array helper

---
 src/utils/hex-to-uint8-array.spec.ts |  9 +++++++++
 src/utils/hex-to-uint8-array.ts      | 18 ++++++++++++++++++
 2 files changed, 27 insertions(+)
 create mode 100644 src/utils/hex-to-uint8-array.spec.ts
 create mode 100644 src/utils/hex-to-uint8-array.ts

diff --git a/src/utils/hex-to-uint8-array.spec.ts b/src/utils/hex-to-uint8-array.spec.ts
new file mode 100644
index 0000000..219ec7b
--- /dev/null
+++ b/src/utils/hex-to-uint8-array.spec.ts
@@ -0,0 +1,9 @@
+import {hexToUint8Array} from './hex-to-uint8-array'
+
+describe('hexToUint8Array', () => {
+    it('should convert hex to Uint8Array', () => {
+        expect(hexToUint8Array('0xdeadbeef')).toEqual(
+            new Uint8Array([222, 173, 190, 239])
+        )
+    })
+})
diff --git a/src/utils/hex-to-uint8-array.ts b/src/utils/hex-to-uint8-array.ts
new file mode 100644
index 0000000..deabbbb
--- /dev/null
+++ b/src/utils/hex-to-uint8-array.ts
@@ -0,0 +1,18 @@
+import assert from 'assert'
+import {trim0x} from './zero-x-prefix'
+import {isHexBytes} from '../validations'
+
+/**
+ * Convert hex string to Uint8Array. String must be prefixed with 0x and have even length
+ */
+export const hexToUint8Array = (hex: string): Uint8Array => {
+    assert(isHexBytes(hex), 'invalid hex bytes')
+    const trimmed = trim0x(hex)
+    const array = new Uint8Array({length: trimmed.length / 2})
+
+    for (let i = 0; i < trimmed.length; i += 2) {
+        array[i / 2] = parseInt(trimmed.slice(i, i + 2), 16)
+    }
+
+    return array
+}