[Implement] Buffer.writeInt8 (#13)

Author: RedDwarfian

assembly/buffer/index.ts

@@ -23,6 +23,12 @@ export class Buffer extends Uint8Array {
  return result;
  }
 
+ writeInt8(value: i8, offset: i32 = 0): i32 {
+ if(<u32>offset > this.dataLength) throw new RangeError(E_INDEXOUTOFRANGE);
+ store<i8>(this.dataStart + offset, value);
+ return offset + 1;
+ }
+ 
  readInt8(offset: i32 = 0): i8 {
  if(<u32>offset >= this.dataLength) throw new RangeError(E_INDEXOUTOFRANGE);
  return load<i8>(this.dataStart + usize(offset));

assembly/node.d.ts

@@ -3,6 +3,8 @@ declare class Buffer extends Uint8Array {
  static alloc(size: i32): Buffer;
  /** This method allocates a new Buffer of indicated size. This is unsafe because the data is not zeroed. */
  static allocUnsafe(size: i32): Buffer;
+ /** Writes an inputted value to the buffer, at the desired offset. */
+ writeInt8(value:i8, offset?:i32): i32;
  /** Reads a signed integer at the designated offset. */
  readInt8(offset?: i32): i8;
 }

tests/buffer.spec.ts

@@ -43,6 +43,14 @@ describe("buffer", () => {
  // TODO: expectFn(() => { Buffer.allocUnsafe(BLOCK_MAXSIZE + 1); }).toThrow();
  });
 
+ test("#writeInt8", () => {
+ let buff = new Buffer(5);
+ expect<i32>(buff.writeInt8(9)).toBe(1);
+ expect<i32>(buff.writeInt8(-3,4)).toBe(5);
+ expect<i8>(buff[0]).toBe(9);
+ expect<i8>(buff[4]).toBe(-3);
+ });
+
  test("#readInt8", () => {
  let buff = new Buffer(10);
  buff[0] = 5;
@@ -57,4 +65,5 @@ describe("buffer", () => {
  // newBuff.readInt8(5);
  // }).toThrow();
  })
+
 });