utf8 encode.ts

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47.61% Branches 10/21

100% Functions 4/4

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const hasBuffer = typeof Buffer !== 'undefined';
const utf8Write = hasBuffer
  ? (Buffer.prototype.utf8Write as (this: Uint8Array, str: string, pos: number, maxLength: number) => number)
  : null;
const from = hasBuffer ? Buffer.from : null;
 
export type EncodeString = (arr: Uint8Array, str: string, pos: number, maxLength: number) => number;
 
export const encodeUtf8Write: EncodeString = (arr: Uint8Array, str: string, pos: number, maxLength: number): number =>
  utf8Write!.call(arr, str, pos, maxLength);
 
export const encodeFrom: EncodeString = (arr: Uint8Array, str: string, pos: number, maxLength: number): number => {
  const offset = arr.byteOffset + pos;
  const buf = from!(arr.buffer).subarray(offset, offset + maxLength);
  return buf.write(str, 0, maxLength, 'utf8');
};
 
export const encodeNative: EncodeString = (arr: Uint8Array, str: string, pos: number, maxLength: number): number => {
  const length = str.length;
  const start = pos;
  let curr = 0;
  while (curr < length) {
    let value = str.charCodeAt(curr++);
    if ((value & 0xffffff80) === 0) {
      arr[pos++] = value;
      continue;
    } else if ((value & 0xfffff800) === 0) {
      arr[pos++] = ((value >> 6) & 0x1f) | 0xc0;
    } else {
      Iif (value >= 0xd800 && value <= 0xdbff) {
        Iif (curr < length) {
          const extra = str.charCodeAt(curr);
          Iif ((extra & 0xfc00) === 0xdc00) {
            curr++;
            value = ((value & 0x3ff) << 10) + (extra & 0x3ff) + 0x10000;
          }
        }
      }
      if ((value & 0xffff0000) === 0) {
        arr[pos++] = ((value >> 12) & 0x0f) | 0xe0;
        arr[pos++] = ((value >> 6) & 0x3f) | 0x80;
      } else E{
        arr[pos++] = ((value >> 18) & 0x07) | 0xf0;
        arr[pos++] = ((value >> 12) & 0x3f) | 0x80;
        arr[pos++] = ((value >> 6) & 0x3f) | 0x80;
      }
    }
    arr[pos++] = (value & 0x3f) | 0x80;
  }
  return pos - start;
};
 
const textEncoder = typeof TextEncoder !== 'undefined' ? new TextEncoder() : null;
 
export const encodeTe: EncodeString = (arr: Uint8Array, str: string, pos: number, maxLength: number): number =>
  textEncoder!.encodeInto(str, arr.subarray(pos, pos + maxLength)).written!;
 
export const encode = utf8Write ? encodeUtf8Write : from ? encodeFrom : encodeNative;