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comparison of different base64 shims
<script>
for (var
WebReflection = {},
DChambers = {},
decoded = [],
i = 0,
encoded;
i < 0xFFFF; ++i
) {
decoded[i] = String.fromCharCode(i % 0xFF);
}
decoded = decoded.join("");
;(function (window) {
var
characters = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=',
fromCharCode = String.fromCharCode,
INVALID_CHARACTER_ERR = (function () {
// fabricate a suitable error object
try { document.createElement('$'); }
catch (error) { return error; }}());
// encoder
window.btoa || (
window.btoa = function (string) {
var
a, b, b1, b2, b3, b4, c, i = 0,
len = string.length, max = Math.max, result = '';
while (i < len) {
a = string.charCodeAt(i++) || 0;
b = string.charCodeAt(i++) || 0;
c = string.charCodeAt(i++) || 0;
if (max(a, b, c) > 0xFF) {
throw INVALID_CHARACTER_ERR;
}
b1 = (a >> 2) & 0x3F;
b2 = ((a & 0x3) << 4) | ((b >> 4) & 0xF);
b3 = ((b & 0xF) << 2) | ((c >> 6) & 0x3);
b4 = c & 0x3F;
if (!b) {
b3 = b4 = 64;
} else if (!c) {
b4 = 64;
}
result += characters.charAt(b1) + characters.charAt(b2) + characters.charAt(b3) + characters.charAt(b4);
}
return result;
});
// decoder
window.atob || (
window.atob = function (string) {
string = string.replace(/=+$/, '');
var
a, b, b1, b2, b3, b4, c, i = 0,
len = string.length, chars = [];
if (len % 4 === 1) throw INVALID_CHARACTER_ERR;
while (i < len) {
b1 = characters.indexOf(string.charAt(i++));
b2 = characters.indexOf(string.charAt(i++));
b3 = characters.indexOf(string.charAt(i++));
b4 = characters.indexOf(string.charAt(i++));
a = ((b1 & 0x3F) << 2) | ((b2 >> 4) & 0x3);
b = ((b2 & 0xF) << 4) | ((b3 >> 2) & 0xF);
c = ((b3 & 0x3) << 6) | (b4 & 0x3F);
chars.push(fromCharCode(a));
b && chars.push(fromCharCode(b));
c && chars.push(fromCharCode(c));
}
return chars.join('');
});
}(DChambers));
!function (window) {
// (C) WebReflection - Mit Style License
// optimized version of the "official shim" by David Chambers
// https://bitbucket.org/davidchambers/base64.js/src
var
fromCharCode = (function ($fromCharCode, MAX_LENGTH) {
return function fromCharCode(code) {
for (var
result = [],
i = 0,
length = code.length;
i < length; i += MAX_LENGTH
) {
result.push($fromCharCode.apply(null, code.slice(i, i + MAX_LENGTH)));
}
return result.join("");
};
}(String.fromCharCode, 0xFFFF)),
characters = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=".split(""),
sretcarahc = {},
INVALID_CHARACTER_ERR = new Error("Invalid Character"),
max = Math.max,
re = /=+$/,
len = characters.length
;
while (len--) sretcarahc[characters[len]] = len;
window.atob || (window.atob = function atob(string) {
if (string.length % 4) throw INVALID_CHARACTER_ERR;
string = string.replace(re, "").split("");
var
a, b, b1, b2, b3, b4, c,
i = 0, j = 0,
result = []
;
len = string.length;
while (i < len) {
b1 = sretcarahc[string[i++]];
b2 = sretcarahc[string[i++]];
b3 = sretcarahc[string[i++]];
b4 = sretcarahc[string[i++]];
a = ((b1 & 0x3F) << 2) | ((b2 >> 4) & 0x3);
b = ((b2 & 0xF) << 4) | ((b3 >> 2) & 0xF);
c = ((b3 & 0x3) << 6) | (b4 & 0x3F);
result[j++] = a;
b && (result[j++] = b);
c && (result[j++] = c);
}
return fromCharCode(result);
});
window.btoa || (window.btoa = function btoa(string) {
var
a, b, b1, b2, b3, b4, c,
i = 0,
result = []
;
len = string.length
while (i < len) {
a = string.charCodeAt(i++) || 0;
b = string.charCodeAt(i++) || 0;
c = string.charCodeAt(i++) || 0;
if (0xFF < max(a, b, c)) throw INVALID_CHARACTER_ERR;
b1 = (a >> 2) & 0x3F;
b2 = ((a & 0x3) << 4) | ((b >> 4) & 0xF);
b3 = ((b & 0xF) << 2) | ((c >> 6) & 0x3);
b4 = c & 0x3F;
b ? c ? 0 : b4 = 64 : b3 = b4 = 64;
result.push(
characters[b1],
characters[b2],
characters[b3],
characters[b4]
);
}
return result.join("");
});
}(WebReflection);
encoded = (window.btoa || WebReflection.btoa)(decoded);
</script>
Ready to run.
Test | Ops/sec | |
---|---|---|
native |
| ready |
WebReflection |
| ready |
David Chamber |
| ready |
You can edit these tests or add more tests to this page by appending /edit to the URL.