school/qiniu-js/lib/base64.js

"use strict";

var _Object$defineProperty = require("@babel/runtime-corejs2/core-js/object/define-property");

_Object$defineProperty(exports, "__esModule", {
  value: true
});

exports.utf8Encode = utf8Encode;
exports.base64Encode = base64Encode;
exports.base64Decode = base64Decode;
exports.urlSafeBase64Encode = urlSafeBase64Encode;
exports.urlSafeBase64Decode = urlSafeBase64Decode;

/* eslint-disable */
function utf8Encode(argString) {
  // http://kevin.vanzonneveld.net
  // +   original by: Webtoolkit.info (http://www.webtoolkit.info/)
  // +   improved by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)
  // +   improved by: sowberry
  // +    tweaked by: Jack
  // +   bugfixed by: Onno Marsman
  // +   improved by: Yves Sucaet
  // +   bugfixed by: Onno Marsman
  // +   bugfixed by: Ulrich
  // +   bugfixed by: Rafal Kukawski
  // +   improved by: kirilloid
  // +   bugfixed by: kirilloid
  // *     example 1: this.utf8Encode('Kevin van Zonneveld')
  // *     returns 1: 'Kevin van Zonneveld'
  if (argString === null || typeof argString === 'undefined') {
    return '';
  }

  var string = argString + ''; // .replace(/\r\n/g, '\n').replace(/\r/g, '\n')

  var utftext = '',
      start,
      end,
      stringl = 0;
  start = end = 0;
  stringl = string.length;

  for (var n = 0; n < stringl; n++) {
    var c1 = string.charCodeAt(n);
    var enc = null;

    if (c1 < 128) {
      end++;
    } else if (c1 > 127 && c1 < 2048) {
      enc = String.fromCharCode(c1 >> 6 | 192, c1 & 63 | 128);
    } else if ((c1 & 0xf800 ^ 0xd800) > 0) {
      enc = String.fromCharCode(c1 >> 12 | 224, c1 >> 6 & 63 | 128, c1 & 63 | 128);
    } else {
      // surrogate pairs
      if ((c1 & 0xfc00 ^ 0xd800) > 0) {
        throw new RangeError('Unmatched trail surrogate at ' + n);
      }

      var c2 = string.charCodeAt(++n);

      if ((c2 & 0xfc00 ^ 0xdc00) > 0) {
        throw new RangeError('Unmatched lead surrogate at ' + (n - 1));
      }

      c1 = ((c1 & 0x3ff) << 10) + (c2 & 0x3ff) + 0x10000;
      enc = String.fromCharCode(c1 >> 18 | 240, c1 >> 12 & 63 | 128, c1 >> 6 & 63 | 128, c1 & 63 | 128);
    }

    if (enc !== null) {
      if (end > start) {
        utftext += string.slice(start, end);
      }

      utftext += enc;
      start = end = n + 1;
    }
  }

  if (end > start) {
    utftext += string.slice(start, stringl);
  }

  return utftext;
}

function base64Encode(data) {
  // http://kevin.vanzonneveld.net
  // +   original by: Tyler Akins (http://rumkin.com)
  // +   improved by: Bayron Guevara
  // +   improved by: Thunder.m
  // +   improved by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)
  // +   bugfixed by: Pellentesque Malesuada
  // +   improved by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)
  // -    depends on: this.utf8Encode
  // *     example 1: this.base64Encode('Kevin van Zonneveld')
  // *     returns 1: 'S2V2aW4gdmFuIFpvbm5ldmVsZA=='
  // mozilla has this native
  // - but breaks in 2.0.0.12!
  // if (typeof this.window['atob'] == 'function') {
  //    return atob(data)
  // }
  var b64 = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=';
  var o1,
      o2,
      o3,
      h1,
      h2,
      h3,
      h4,
      bits,
      i = 0,
      ac = 0,
      enc = '',
      tmp_arr = [];

  if (!data) {
    return data;
  }

  data = utf8Encode(data + '');

  do {
    // pack three octets into four hexets
    o1 = data.charCodeAt(i++);
    o2 = data.charCodeAt(i++);
    o3 = data.charCodeAt(i++);
    bits = o1 << 16 | o2 << 8 | o3;
    h1 = bits >> 18 & 0x3f;
    h2 = bits >> 12 & 0x3f;
    h3 = bits >> 6 & 0x3f;
    h4 = bits & 0x3f; // use hexets to index into b64, and append result to encoded string

    tmp_arr[ac++] = b64.charAt(h1) + b64.charAt(h2) + b64.charAt(h3) + b64.charAt(h4);
  } while (i < data.length);

  enc = tmp_arr.join('');

  switch (data.length % 3) {
    case 1:
      enc = enc.slice(0, -2) + '==';
      break;

    case 2:
      enc = enc.slice(0, -1) + '=';
      break;
  }

  return enc;
}

function base64Decode(data) {
  // http://kevin.vanzonneveld.net
  // +   original by: Tyler Akins (http://rumkin.com)
  // +   improved by: Thunder.m
  // +      input by: Aman Gupta
  // +   improved by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)
  // +   bugfixed by: Onno Marsman
  // +   bugfixed by: Pellentesque Malesuada
  // +   improved by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)
  // +      input by: Brett Zamir (http://brett-zamir.me)
  // +   bugfixed by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)
  // *     example 1: base64_decode('S2V2aW4gdmFuIFpvbm5ldmVsZA==')
  // *     returns 1: 'Kevin van Zonneveld'
  // mozilla has this native
  // - but breaks in 2.0.0.12!
  // if (typeof this.window['atob'] == 'function') {
  //    return atob(data)
  // }
  var b64 = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=';
  var o1,
      o2,
      o3,
      h1,
      h2,
      h3,
      h4,
      bits,
      i = 0,
      ac = 0,
      dec = '',
      tmp_arr = [];

  if (!data) {
    return data;
  }

  data += '';

  do {
    // unpack four hexets into three octets using index points in b64
    h1 = b64.indexOf(data.charAt(i++));
    h2 = b64.indexOf(data.charAt(i++));
    h3 = b64.indexOf(data.charAt(i++));
    h4 = b64.indexOf(data.charAt(i++));
    bits = h1 << 18 | h2 << 12 | h3 << 6 | h4;
    o1 = bits >> 16 & 0xff;
    o2 = bits >> 8 & 0xff;
    o3 = bits & 0xff;

    if (h3 === 64) {
      tmp_arr[ac++] = String.fromCharCode(o1);
    } else if (h4 === 64) {
      tmp_arr[ac++] = String.fromCharCode(o1, o2);
    } else {
      tmp_arr[ac++] = String.fromCharCode(o1, o2, o3);
    }
  } while (i < data.length);

  dec = tmp_arr.join('');
  return dec;
}

function urlSafeBase64Encode(v) {
  v = base64Encode(v);
  return v.replace(/\//g, '_').replace(/\+/g, '-');
}

function urlSafeBase64Decode(v) {
  v = v.replace(/_/g, '/').replace(/-/g, '+');
  return base64Decode(v);
}