Ushio-cn-old/yimian/iot/mqtt/smartfarm/node_modules/msgpack-lite/lib/bufferish-uint8array.js

// bufferish-uint8array.js

var Bufferish = require("./bufferish");

var exports = module.exports = Bufferish.hasArrayBuffer ? alloc(0) : [];

exports.alloc = alloc;
exports.concat = Bufferish.concat;
exports.from = from;

/**
 * @param size {Number}
 * @returns {Buffer|Uint8Array|Array}
 */

function alloc(size) {
  return new Uint8Array(size);
}

/**
 * @param value {Array|ArrayBuffer|Buffer|String}
 * @returns {Uint8Array}
 */

function from(value) {
  if (Bufferish.isView(value)) {
    // TypedArray to ArrayBuffer
    var byteOffset = value.byteOffset;
    var byteLength = value.byteLength;
    value = value.buffer;
    if (value.byteLength !== byteLength) {
      if (value.slice) {
        value = value.slice(byteOffset, byteOffset + byteLength);
      } else {
        // Android 4.1 does not have ArrayBuffer.prototype.slice
        value = new Uint8Array(value);
        if (value.byteLength !== byteLength) {
          // TypedArray to ArrayBuffer to Uint8Array to Array
          value = Array.prototype.slice.call(value, byteOffset, byteOffset + byteLength);
        }
      }
    }
  } else if (typeof value === "string") {
    // String to Uint8Array
    return Bufferish.from.call(exports, value);
  } else if (typeof value === "number") {
    throw new TypeError('"value" argument must not be a number');
  }

  return new Uint8Array(value);
}