Add new uint8array helpers

1 files changed, 71 insertions, 0 deletions

diff --git a/packages/server/src/helpers/uint8array.ts b/packages/server/src/helpers/uint8array.ts
new file mode 100644
index 0000000..4e2d4dc
--- /dev/null
+++ b/packages/server/src/helpers/uint8array.ts
@@ -0,0 +1,71 @@
+/**
+ * Make sure two Uint8Arrays are deeply equivalent
+ */
+export function areEqual(array1: Uint8Array, array2: Uint8Array): boolean {
+  if (array1.length != array2.length) {
+    return false;
+  }
+
+  return array1.every((val, i) => val === array2[i]);
+}
+
+/**
+ * Convert a Uint8Array to Hexadecimal.
+ *
+ * A replacement for `Buffer.toString('hex')`
+ */
+export function toHex(array: Uint8Array): string {
+  const hexParts = Array.from(array, i => i.toString(16).padStart(2, "0"));
+
+  // adce000235bcc60a648b0b25f1f05503
+  return hexParts.join('');
+}
+
+/**
+ * Convert a Uint8Array to Base64.
+ *
+ * A replacement for `Buffer.toString('base64')`
+ */
+export function toBase64(array: Uint8Array): string {
+  let str = '';
+
+  for (const charCode of array) {
+    str += String.fromCharCode(charCode);
+  }
+
+  const base64String = btoa(str);
+
+  return base64String;
+}
+
+/**
+ * Combine multiple Uint8Arrays into a single Uint8Array
+ */
+export function concat(arrays: Uint8Array[]): Uint8Array {
+  let pointer = 0;
+  const totalLength = arrays.reduce((prev, curr) => prev + curr.length, 0);
+
+  const toReturn = new Uint8Array(totalLength);
+
+  arrays.forEach((arr) => {
+    toReturn.set(arr, pointer);
+    pointer += arr.length;
+  });
+
+  return toReturn;
+}
+
+/**
+ * Convert an ASCII string to Uint8Array
+ */
+export function fromString(value: string): Uint8Array {
+  return Uint8Array.from(value.split("").map(x => x.charCodeAt(0)));
+}
+
+export default {
+  areEqual,
+  toHex,
+  toBase64,
+  concat,
+  fromString,
+};