rasha.js/lib/encoding.js

102 lines
2.3 KiB
JavaScript

'use strict';
var Enc = module.exports;
Enc.bufToHex = function toHex(u8) {
var hex = [];
var i, h;
for (i = 0; i < u8.byteLength; i += 1) {
h = u8[i].toString(16);
if (2 !== h.length) { h = '0' + h; }
hex.push(h);
}
return hex.join('').toLowerCase();
};
Enc.hexToBase64 = function (hex) {
return Buffer.from(hex, 'hex').toString('base64');
};
Enc.hexToBuf = function (hex) {
return Buffer.from(hex, 'hex');
};
Enc.numToHex = function numToHex(d) {
d = d.toString(16);
if (d.length % 2) {
return '0' + d;
}
return d;
};
Enc.base64ToHex = function base64ToHex(b64) {
return Enc.bufToHex(Enc.base64ToBuf(b64));
};
Enc.bufToBase64 = function toHex(u8) {
// we want to maintain api compatability with browser APIs,
// so we assume that this could be a Uint8Array
return Buffer.from(u8).toString('base64');
};
/*
Enc.bufToUint8 = function bufToUint8(buf) {
return new Uint8Array(buf.buffer.slice(buf.byteOffset, buf.byteOffset + buf.byteLength));
};
*/
Enc.bufToUrlBase64 = function toHex(u8) {
return Enc.bufToBase64(u8)
.replace(/\+/g, '-').replace(/\//g, '_').replace(/=/g, '');
};
Enc.strToHex = function strToHex(str) {
return Buffer.from(str).toString('hex');
};
Enc.strToBuf = function strToBuf(str) {
return Buffer.from(str);
};
/*
Enc.strToBin = function strToBin(str) {
var escstr = encodeURIComponent(str);
// replaces any uri escape sequence, such as %0A,
// with binary escape, such as 0x0A
var binstr = escstr.replace(/%([0-9A-F]{2})/g, function(match, p1) {
return String.fromCharCode(parseInt(p1, 16));
});
return binstr;
};
*/
/*
Enc.strToBase64 = function strToBase64(str) {
// node automatically can tell the difference
// between uc2 (utf-8) strings and binary strings
// so we don't have to re-encode the strings
return Buffer.from(str).toString('base64');
};
*/
/*
Enc.urlBase64ToBase64 = function urlsafeBase64ToBase64(str) {
var r = str % 4;
if (2 === r) {
str += '==';
} else if (3 === r) {
str += '=';
}
return str.replace(/-/g, '+').replace(/_/g, '/');
};
*/
Enc.base64ToBuf = function base64ToBuf(str) {
// always convert from urlsafe base64, just in case
//return Buffer.from(Enc.urlBase64ToBase64(str)).toString('base64');
return Buffer.from(str, 'base64');
};