Add integer encoding utils

bytes.ts

@@ -39,6 +39,47 @@ export function to_base64(b: BinaryLike): string {
   return encodeBase64(to_utf8(b));
 }
 
+export function read_u16_be(b: Uint8Array, i = 0) {
+  return (b[i++] << 8) + b[i++];
+}
+
+export function read_i16_be(b: Uint8Array, i = 0) {
+  const n = (b[i++] << 8) + b[i++];
+  return n | ((n & 0x8000) * 0x1fffe);
+}
+
+export function read_u32_be(b: Uint8Array, i = 0) {
+  return ((b[i++] << 24) + (b[i++] << 16) + (b[i++] << 8) + b[i++]) >>> 0;
+}
+
+export function read_i32_be(b: Uint8Array, i = 0) {
+  return (b[i++] << 24) + (b[i++] << 16) + (b[i++] << 8) + b[i++];
+}
+
+export function write_u16_be(b: Uint8Array, n: number, i = 0) {
+  if (n < 0 || 0xffff < n)
+    throw new TypeError(`input out of range, expected u16`);
+  (b[i++] = n >>> 8), (b[i++] = n);
+}
+
+export function write_i16_be(b: Uint8Array, n: number, i = 0) {
+  if (n < -0x8000 || 0x7fff < n)
+    throw new TypeError(`input out of range, expected i16`);
+  (b[i++] = n >>> 8), (b[i++] = n);
+}
+
+export function write_u32_be(b: Uint8Array, n: number, i = 0) {
+  if (n < 0 || 0xffffffff < n)
+    throw new TypeError(`input out of range, expected u32`);
+  (b[i++] = n >>> 24), (b[i++] = n >>> 16), (b[i++] = n >>> 8), (b[i++] = n);
+}
+
+export function write_i32_be(b: Uint8Array, n: number, i = 0) {
+  if (n < -0x80000000 || 0x7fffffff < n)
+    throw new TypeError(`input out of range, expected i32`);
+  (b[i++] = n >>> 24), (b[i++] = n >>> 16), (b[i++] = n >>> 8), (b[i++] = n);
+}
+
 export { equals as buf_eq, concat as buf_concat } from "jsr:@std/bytes@^1.0.4";
 
 export function buf_concat_fast(a: Uint8Array, b: Uint8Array) {

deno.json

@@ -1,5 +1,5 @@
 {
   "name": "@luaneko/lstd",
-  "version": "0.1.3",
+  "version": "0.1.4",
   "exports": "./mod.ts"
 }

mod.ts

@@ -7,6 +7,14 @@ export {
   to_hex,
   from_base64,
   to_base64,
+  read_u16_be,
+  read_i16_be,
+  read_u32_be,
+  read_i32_be,
+  write_u16_be,
+  write_i16_be,
+  write_u32_be,
+  write_i32_be,
   buf_eq,
   buf_concat,
   buf_concat_fast,