diff --git a/bytes.ts b/bytes.ts
index 1b3971d..1f28af8 100644
--- a/bytes.ts
+++ b/bytes.ts
@@ -39,45 +39,65 @@ export function to_base64(b: BinaryLike): string {
   return encodeBase64(to_utf8(b));
 }
 
+export function read_u8(b: Uint8Array, i = 0) {
+  return b[i];
+}
+
+export function write_u8(b: Uint8Array, n: number, i = 0) {
+  if (n < 0 || 0xff < n) throw new TypeError(`input out of range, expected u8`);
+  b[i] = n;
+}
+
+export function read_i8(b: Uint8Array, i = 0) {
+  const n = b[i];
+  return n | ((n & 0x80) * 0x1fffffe);
+}
+
+export function write_i8(b: Uint8Array, n: number, i = 0) {
+  if (n < -0x80 || 0x7f < n)
+    throw new TypeError(`input out of range, expected i8`);
+  b[i] = n;
+}
+
 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++];
+  return (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);
+  (b[i++] = n >>> 8), (b[i] = n);
+}
+
+export function read_i16_be(b: Uint8Array, i = 0) {
+  const n = (b[i++] << 8) + b[i];
+  return n | ((n & 0x8000) * 0x1fffe);
 }
 
 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);
+  (b[i++] = n >>> 8), (b[i] = n);
+}
+
+export function read_u32_be(b: Uint8Array, i = 0) {
+  return ((b[i++] << 24) + (b[i++] << 16) + (b[i++] << 8) + b[i]) >>> 0;
 }
 
 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);
+  (b[i++] = n >>> 24), (b[i++] = n >>> 16), (b[i++] = n >>> 8), (b[i] = n);
+}
+
+export function read_i32_be(b: Uint8Array, i = 0) {
+  return (b[i++] << 24) + (b[i++] << 16) + (b[i++] << 8) + b[i];
 }
 
 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);
+  (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";
diff --git a/deno.json b/deno.json
index b04e117..82dd816 100644
--- a/deno.json
+++ b/deno.json
@@ -1,5 +1,5 @@
 {
   "name": "@luaneko/lstd",
-  "version": "0.1.4",
+  "version": "0.1.5",
   "exports": "./mod.ts"
 }
diff --git a/mod.ts b/mod.ts
index 8f58689..a44ce4a 100644
--- a/mod.ts
+++ b/mod.ts
@@ -7,13 +7,17 @@ export {
   to_hex,
   from_base64,
   to_base64,
+  read_u8,
+  write_u8,
+  read_i8,
+  write_i8,
   read_u16_be,
-  read_i16_be,
-  read_u32_be,
-  read_i32_be,
   write_u16_be,
+  read_i16_be,
   write_i16_be,
+  read_u32_be,
   write_u32_be,
+  read_i32_be,
   write_i32_be,
   buf_eq,
   buf_concat,