react-native-esc-pos-printer/lib/module/printer/utils/BufferHelper.js

An unofficial React Native library for printing on an EPSON TM printer with the Epson ePOS SDK for iOS and Epson ePOS SDK for Android

"use strict";

import { Buffer } from 'buffer';
export class BufferHelper {
  constructor() {
    this.buffers = [];
    this.size = 0;
  }
  get length() {
    return this.size;
  }
  concat(buffer) {
    this.buffers.push(buffer);
    this.size += buffer.length;
    return this;
  }
  empty() {
    this.buffers = [];
    this.size = 0;
    return this;
  }
  toBuffer() {
    // @ts-ignore
    return Buffer.concat(this.buffers, this.size);
  }
  toString(encoding) {
    return this.toBuffer().toString(encoding);
  }
  load(stream, callback) {
    stream.on('data', trunk => {
      this.concat(trunk);
    });
    stream.on('end', () => {
      callback(null, this.toBuffer());
    });
    stream.once('error', callback);
  }
  bytesToString(data, type) {
    this.concat(Buffer.from(data));
    const buffer = this.toBuffer();
    return buffer.toString(type);
  }
}
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