71 lines
1.5 KiB
JavaScript
71 lines
1.5 KiB
JavaScript
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'use strict';
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var Enc = module.exports;
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// to Binary String
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Enc.bufToBin = function(buf) {
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var bin = '';
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// cannot use .map() because Uint8Array would return only 0s
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buf.forEach(function(ch) {
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bin += String.fromCharCode(ch);
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});
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return bin;
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};
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Enc.strToBin = function(str) {
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// Note: TextEncoder might be faster (or it might be slower, I don't know),
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// but it doesn't solve the double-utf8 problem and MS Edge still has users without it
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var escstr = encodeURIComponent(str);
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// replaces any uri escape sequence, such as %0A,
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// with binary escape, such as 0x0A
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var binstr = escstr.replace(/%([0-9A-F]{2})/g, function(_, p1) {
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return String.fromCharCode('0x' + p1);
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});
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return binstr;
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};
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// to Buffer
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Enc.binToBuf = function(bin) {
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var arr = bin.split('').map(function(ch) {
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return ch.charCodeAt(0);
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});
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return 'undefined' !== typeof Uint8Array ? new Uint8Array(arr) : arr;
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};
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Enc.strToBuf = function(str) {
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return Enc.binToBuf(Enc.strToBin(str));
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};
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// to Unicode String
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Enc.binToStr = function(binstr) {
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var escstr = binstr.replace(/(.)/g, function(m, p) {
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var code = p
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.charCodeAt(0)
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.toString(16)
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.toUpperCase();
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if (code.length < 2) {
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code = '0' + code;
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}
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return '%' + code;
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});
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return decodeURIComponent(escstr);
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};
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Enc.bufToStr = function(buf) {
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return Enc.binToStr(Enc.bufToBin(buf));
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};
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// Base64 + Hex
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Enc.base64ToHex = function(b64) {
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return Enc.bufToHex(Enc.base64ToBuf(b64));
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};
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Enc.hexToBase64 = function(hex) {
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return btoa(Enc._hexToBin(hex));
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};
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