postal-mime/dist/qp-decoder.cjs

Email parser for Node.js and browser environments

"use strict";
var __defProp = Object.defineProperty;
var __getOwnPropDesc = Object.getOwnPropertyDescriptor;
var __getOwnPropNames = Object.getOwnPropertyNames;
var __hasOwnProp = Object.prototype.hasOwnProperty;
var __export = (target, all) => {
  for (var name in all)
    __defProp(target, name, { get: all[name], enumerable: true });
};
var __copyProps = (to, from, except, desc) => {
  if (from && typeof from === "object" || typeof from === "function") {
    for (let key of __getOwnPropNames(from))
      if (!__hasOwnProp.call(to, key) && key !== except)
        __defProp(to, key, { get: () => from[key], enumerable: !(desc = __getOwnPropDesc(from, key)) || desc.enumerable });
  }
  return to;
};
var __toCommonJS = (mod) => __copyProps(__defProp({}, "__esModule", { value: true }), mod);
var qp_decoder_exports = {};
__export(qp_decoder_exports, {
  default: () => QPDecoder
});
module.exports = __toCommonJS(qp_decoder_exports);
var import_decode_strings = require("./decode-strings.cjs");
const VALID_QP_REGEX = /^=[a-f0-9]{2}$/i;
const QP_SPLIT_REGEX = /(?==[a-f0-9]{2})/i;
const SOFT_LINE_BREAK_REGEX = /=\r?\n/g;
const PARTIAL_QP_ENDING_REGEX = /=[a-fA-F0-9]?$/;
class QPDecoder {
  constructor(opts) {
    opts = opts || {};
    this.decoder = opts.decoder || new TextDecoder();
    this.maxChunkSize = 100 * 1024;
    this.remainder = "";
    this.chunks = [];
  }
  decodeQPBytes(encodedBytes) {
    let buf = new ArrayBuffer(encodedBytes.length);
    let dataView = new DataView(buf);
    for (let i = 0, len = encodedBytes.length; i < len; i++) {
      dataView.setUint8(i, parseInt(encodedBytes[i], 16));
    }
    return buf;
  }
  decodeChunks(str) {
    str = str.replace(SOFT_LINE_BREAK_REGEX, "");
    let list = str.split(QP_SPLIT_REGEX);
    let encodedBytes = [];
    for (let part of list) {
      if (part.charAt(0) !== "=") {
        if (encodedBytes.length) {
          this.chunks.push(this.decodeQPBytes(encodedBytes));
          encodedBytes = [];
        }
        this.chunks.push(part);
        continue;
      }
      if (part.length === 3) {
        if (VALID_QP_REGEX.test(part)) {
          encodedBytes.push(part.substr(1));
        } else {
          if (encodedBytes.length) {
            this.chunks.push(this.decodeQPBytes(encodedBytes));
            encodedBytes = [];
          }
          this.chunks.push(part);
        }
        continue;
      }
      if (part.length > 3) {
        const firstThree = part.substr(0, 3);
        if (VALID_QP_REGEX.test(firstThree)) {
          encodedBytes.push(part.substr(1, 2));
          this.chunks.push(this.decodeQPBytes(encodedBytes));
          encodedBytes = [];
          part = part.substr(3);
          this.chunks.push(part);
        } else {
          if (encodedBytes.length) {
            this.chunks.push(this.decodeQPBytes(encodedBytes));
            encodedBytes = [];
          }
          this.chunks.push(part);
        }
      }
    }
    if (encodedBytes.length) {
      this.chunks.push(this.decodeQPBytes(encodedBytes));
    }
  }
  update(buffer) {
    let str = this.decoder.decode(buffer) + "\n";
    str = this.remainder + str;
    if (str.length < this.maxChunkSize) {
      this.remainder = str;
      return;
    }
    this.remainder = "";
    let partialEnding = str.match(PARTIAL_QP_ENDING_REGEX);
    if (partialEnding) {
      if (partialEnding.index === 0) {
        this.remainder = str;
        return;
      }
      this.remainder = str.substr(partialEnding.index);
      str = str.substr(0, partialEnding.index);
    }
    this.decodeChunks(str);
  }
  finalize() {
    if (this.remainder.length) {
      this.decodeChunks(this.remainder);
      this.remainder = "";
    }
    return (0, import_decode_strings.blobToArrayBuffer)(new Blob(this.chunks, { type: "application/octet-stream" }));
  }
}

// Make default export work naturally with require()
if (module.exports.default) {
    var defaultExport = module.exports.default;
    var namedExports = {};
    for (var key in module.exports) {
        if (key !== 'default' && key !== '__esModule') {
            namedExports[key] = module.exports[key];
        }
    }
    module.exports = defaultExport;
    Object.assign(module.exports, namedExports);
    // Preserve __esModule and .default for bundler/transpiler interop
    Object.defineProperty(module.exports, '__esModule', { value: true });
    module.exports.default = defaultExport;
}