base64x-1.1.js

/*! base64x-1.1.5 (c) 2012-2015 Kenji Urushima | kjur.github.com/jsjws/license
 */
/*
 * base64x.js - Base64url and supplementary functions for Tom Wu's base64.js library
 *
 * version: 1.1.5 (2015-Sep-13)
 *
 * Copyright (c) 2012-2015 Kenji Urushima (kenji.urushima@gmail.com)
 *
 * This software is licensed under the terms of the MIT License.
 * http://kjur.github.com/jsjws/license/
 *
 * The above copyright and license notice shall be 
 * included in all copies or substantial portions of the Software.
 *
 * DEPENDS ON:
 *   - base64.js - Tom Wu's Base64 library
 */

/**
 * @fileOverview
 * @name base64x-1.1.js
 * @author Kenji Urushima kenji.urushima@gmail.com
 * @version asn1 1.1.5 (2015-Sep-13)
 * @since jsrsasign 2.1
 * @license <a href="http://kjur.github.io/jsrsasign/license/">MIT License</a>
 */

/**
 * Base64URL and supplementary functions for Tom Wu's base64.js library.<br/>
 * This class is just provide information about global functions
 * defined in 'base64x.js'. The 'base64x.js' script file provides
 * global functions for converting following data each other.
 * <ul>
 * <li>(ASCII) String</li>
 * <li>UTF8 String including CJK, Latin and other characters</li>
 * <li>byte array</li>
 * <li>hexadecimal encoded String</li>
 * <li>Full URIComponent encoded String (such like "%69%94")</li>
 * <li>Base64 encoded String</li>
 * <li>Base64URL encoded String</li>
 * </ul>
 * All functions in 'base64x.js' are defined in {@link _global_} and not
 * in this class.
 * 
 * @class Base64URL and supplementary functions for Tom Wu's base64.js library
 * @author Kenji Urushima
 * @version 1.1 (07 May 2012)
 * @requires base64.js
 * @see <a href="http://kjur.github.com/jsjws/">'jwjws'(JWS JavaScript Library) home page http://kjur.github.com/jsjws/</a>
 * @see <a href="http://kjur.github.com/jsrsasigns/">'jwrsasign'(RSA Sign JavaScript Library) home page http://kjur.github.com/jsrsasign/</a>
 */
function Base64x() {
}

// ==== string / byte array ================================
/**
 * convert a string to an array of character codes
 * @param {String} s
 * @return {Array of Numbers} 
 */
function stoBA(s) {
    var a = new Array();
    for (var i = 0; i < s.length; i++) {
	a[i] = s.charCodeAt(i);
    }
    return a;
}

/**
 * convert an array of character codes to a string
 * @param {Array of Numbers} a array of character codes
 * @return {String} s
 */
function BAtos(a) {
    var s = "";
    for (var i = 0; i < a.length; i++) {
	s = s + String.fromCharCode(a[i]);
    }
    return s;
}

// ==== byte array / hex ================================
/**
 * convert an array of bytes(Number) to hexadecimal string.<br/>
 * @param {Array of Numbers} a array of bytes
 * @return {String} hexadecimal string
 */
function BAtohex(a) {
    var s = "";
    for (var i = 0; i < a.length; i++) {
	var hex1 = a[i].toString(16);
	if (hex1.length == 1) hex1 = "0" + hex1;
	s = s + hex1;
    }
    return s;
}

// ==== string / hex ================================
/**
 * convert a ASCII string to a hexadecimal string of ASCII codes.<br/>
 * NOTE: This can't be used for non ASCII characters.
 * @param {s} s ASCII string
 * @return {String} hexadecimal string
 */
function stohex(s) {
    return BAtohex(stoBA(s));
}

// ==== string / base64 ================================
/**
 * convert a ASCII string to a Base64 encoded string.<br/>
 * NOTE: This can't be used for non ASCII characters.
 * @param {s} s ASCII string
 * @return {String} Base64 encoded string
 */
function stob64(s) {
    return hex2b64(stohex(s));
}

// ==== string / base64url ================================
/**
 * convert a ASCII string to a Base64URL encoded string.<br/>
 * NOTE: This can't be used for non ASCII characters.
 * @param {s} s ASCII string
 * @return {String} Base64URL encoded string
 */
function stob64u(s) {
    return b64tob64u(hex2b64(stohex(s)));
}

/**
 * convert a Base64URL encoded string to a ASCII string.<br/>
 * NOTE: This can't be used for Base64URL encoded non ASCII characters.
 * @param {s} s Base64URL encoded string
 * @return {String} ASCII string
 */
function b64utos(s) {
    return BAtos(b64toBA(b64utob64(s)));
}

// ==== base64 / base64url ================================
/**
 * convert a Base64 encoded string to a Base64URL encoded string.<br/>
 * Example: "ab+c3f/==" &rarr; "ab-c3f_"
 * @param {String} s Base64 encoded string
 * @return {String} Base64URL encoded string
 */
function b64tob64u(s) {
    s = s.replace(/\=/g, "");
    s = s.replace(/\+/g, "-");
    s = s.replace(/\//g, "_");
    return s;
}

/**
 * convert a Base64URL encoded string to a Base64 encoded string.<br/>
 * Example: "ab-c3f_" &rarr; "ab+c3f/=="
 * @param {String} s Base64URL encoded string
 * @return {String} Base64 encoded string
 */
function b64utob64(s) {
    if (s.length % 4 == 2) s = s + "==";
    else if (s.length % 4 == 3) s = s + "=";
    s = s.replace(/-/g, "+");
    s = s.replace(/_/g, "/");
    return s;
}

// ==== hex / base64url ================================
/**
 * convert a hexadecimal string to a Base64URL encoded string.<br/>
 * @param {String} s hexadecimal string
 * @return {String} Base64URL encoded string
 * @description
 * convert a hexadecimal string to a Base64URL encoded string.
 * NOTE: If leading "0" is omitted and odd number length for
 * hexadecimal leading "0" is automatically added.
 */
function hextob64u(s) {
    if (s.length % 2 == 1) s = "0" + s;
    return b64tob64u(hex2b64(s));
}

/**
 * convert a Base64URL encoded string to a hexadecimal string.<br/>
 * @param {String} s Base64URL encoded string
 * @return {String} hexadecimal string
 */
function b64utohex(s) {
    return b64tohex(b64utob64(s));
}

var utf8tob64u, b64utoutf8;

if (typeof Buffer === 'function')
{
  utf8tob64u = function (s)
  {
    return b64tob64u(new Buffer(s, 'utf8').toString('base64'));
  };

  b64utoutf8 = function (s)
  {
    return new Buffer(b64utob64(s), 'base64').toString('utf8');
  };
}
else
{
// ==== utf8 / base64url ================================
/**
 * convert a UTF-8 encoded string including CJK or Latin to a Base64URL encoded string.<br/>
 * @param {String} s UTF-8 encoded string
 * @return {String} Base64URL encoded string
 * @since 1.1
 */
  utf8tob64u = function (s)
  {
    return hextob64u(uricmptohex(encodeURIComponentAll(s)));
  };

/**
 * convert a Base64URL encoded string to a UTF-8 encoded string including CJK or Latin.<br/>
 * @param {String} s Base64URL encoded string
 * @return {String} UTF-8 encoded string
 * @since 1.1
 */
  b64utoutf8 = function (s)
  {
    return decodeURIComponent(hextouricmp(b64utohex(s)));
  };
}

// ==== utf8 / base64url ================================
/**
 * convert a UTF-8 encoded string including CJK or Latin to a Base64 encoded string.<br/>
 * @param {String} s UTF-8 encoded string
 * @return {String} Base64 encoded string
 * @since 1.1.1
 */
function utf8tob64(s) {
  return hex2b64(uricmptohex(encodeURIComponentAll(s)));
}

/**
 * convert a Base64 encoded string to a UTF-8 encoded string including CJK or Latin.<br/>
 * @param {String} s Base64 encoded string
 * @return {String} UTF-8 encoded string
 * @since 1.1.1
 */
function b64toutf8(s) {
  return decodeURIComponent(hextouricmp(b64tohex(s)));
}

// ==== utf8 / hex ================================
/**
 * convert a UTF-8 encoded string including CJK or Latin to a hexadecimal encoded string.<br/>
 * @param {String} s UTF-8 encoded string
 * @return {String} hexadecimal encoded string
 * @since 1.1.1
 */
function utf8tohex(s) {
  return uricmptohex(encodeURIComponentAll(s));
}

/**
 * convert a hexadecimal encoded string to a UTF-8 encoded string including CJK or Latin.<br/>
 * Note that when input is improper hexadecimal string as UTF-8 string, this function returns
 * 'null'.
 * @param {String} s hexadecimal encoded string
 * @return {String} UTF-8 encoded string or null
 * @since 1.1.1
 */
function hextoutf8(s) {
  return decodeURIComponent(hextouricmp(s));
}

/**
 * convert a hexadecimal encoded string to raw string including non printable characters.<br/>
 * @param {String} s hexadecimal encoded string
 * @return {String} raw string
 * @since 1.1.2
 * @example
 * hextorstr("610061") &rarr; "a\x00a"
 */
function hextorstr(sHex) {
    var s = "";
    for (var i = 0; i < sHex.length - 1; i += 2) {
        s += String.fromCharCode(parseInt(sHex.substr(i, 2), 16));
    }
    return s;
}

/**
 * convert a raw string including non printable characters to hexadecimal encoded string.<br/>
 * @param {String} s raw string
 * @return {String} hexadecimal encoded string
 * @since 1.1.2
 * @example
 * rstrtohex("a\x00a") &rarr; "610061"
 */
function rstrtohex(s) {
    var result = "";
    for (var i = 0; i < s.length; i++) {
        result += ("0" + s.charCodeAt(i).toString(16)).slice(-2);
    }
    return result;
}

// ==== hex / b64nl =======================================

/*
 * since base64x 1.1.3
 */
function hextob64(s) {
    return hex2b64(s);
}

/*
 * since base64x 1.1.3
 */
function hextob64nl(s) {
    var b64 = hextob64(s);
    var b64nl = b64.replace(/(.{64})/g, "$1\r\n");
    b64nl = b64nl.replace(/\r\n$/, '');
    return b64nl;
}

/*
 * since base64x 1.1.3
 */
function b64nltohex(s) {
    var b64 = s.replace(/[^0-9A-Za-z\/+=]*/g, '');
    var hex = b64tohex(b64);
    return hex;
} 

// ==== URIComponent / hex ================================
/**
 * convert a URLComponent string such like "%67%68" to a hexadecimal string.<br/>
 * @param {String} s URIComponent string such like "%67%68"
 * @return {String} hexadecimal string
 * @since 1.1
 */
function uricmptohex(s) {
  return s.replace(/%/g, "");
}

/**
 * convert a hexadecimal string to a URLComponent string such like "%67%68".<br/>
 * @param {String} s hexadecimal string
 * @return {String} URIComponent string such like "%67%68"
 * @since 1.1
 */
function hextouricmp(s) {
  return s.replace(/(..)/g, "%$1");
}

// ==== URIComponent ================================
/**
 * convert UTFa hexadecimal string to a URLComponent string such like "%67%68".<br/>
 * Note that these "<code>0-9A-Za-z!'()*-._~</code>" characters will not
 * converted to "%xx" format by builtin 'encodeURIComponent()' function.
 * However this 'encodeURIComponentAll()' function will convert 
 * all of characters into "%xx" format.
 * @param {String} s hexadecimal string
 * @return {String} URIComponent string such like "%67%68"
 * @since 1.1
 */
function encodeURIComponentAll(u8) {
  var s = encodeURIComponent(u8);
  var s2 = "";
  for (var i = 0; i < s.length; i++) {
    if (s[i] == "%") {
      s2 = s2 + s.substr(i, 3);
      i = i + 2;
    } else {
      s2 = s2 + "%" + stohex(s[i]);
    }
  }
  return s2;
}

// ==== new lines ================================
/**
 * convert all DOS new line("\r\n") to UNIX new line("\n") in 
 * a String "s".
 * @param {String} s string 
 * @return {String} converted string
 */
function newline_toUnix(s) {
    s = s.replace(/\r\n/mg, "\n");
    return s;
}

/**
 * convert all UNIX new line("\r\n") to DOS new line("\n") in 
 * a String "s".
 * @param {String} s string 
 * @return {String} converted string
 */
function newline_toDos(s) {
    s = s.replace(/\r\n/mg, "\n");
    s = s.replace(/\n/mg, "\r\n");
    return s;
}

// ==== others ================================

/**
 * find index of string where two string differs
 * @param {String} s1 string to compare
 * @param {String} s2 string to compare
 * @return {Number} string index of where character differs. Return -1 if same.
 * @since jsrsasign 4.9.0 base64x 1.1.5
 * @example
 * strdiffidx("abcdefg", "abcd4fg") -> 4
 * strdiffidx("abcdefg", "abcdefg") -> -1
 * strdiffidx("abcdefg", "abcdef") -> 6
 * strdiffidx("abcdefgh", "abcdef") -> 6
 */
var strdiffidx = function(s1, s2) {
    var n = s1.length;
    if (s1.length > s2.length) n = s2.length;
    for (var i = 0; i < n; i++) {
	if (s1.charCodeAt(i) != s2.charCodeAt(i)) return i;
    }
    if (s1.length != s2.length) return n;
    return -1; // same
};