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JavaScript-Packer/base64-encode-decode.js

Created July 1, 2015 00:45
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Revisions

  1. JavaScript-Packer created this gist Jul 1, 2015.
    24 changes: 24 additions & 0 deletions base64-encode-decode.js
    View file
    Original file line number Diff line number Diff line change
    @@ -0,0 +1,24 @@
    function b2a(a) {
    var c, d, e, f, g, h, i, j, o, b = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=", k = 0, l = 0, m = "", n = [];
    if (!a) return a;
    do c = a.charCodeAt(k++), d = a.charCodeAt(k++), e = a.charCodeAt(k++), j = c << 16 | d << 8 | e,
    f = 63 & j >> 18, g = 63 & j >> 12, h = 63 & j >> 6, i = 63 & j, n[l++] = b.charAt(f) + b.charAt(g) + b.charAt(h) + b.charAt(i); while (k < a.length);
    return m = n.join(""), o = a.length % 3, (o ? m.slice(0, o - 3) :m) + "===".slice(o || 3);
    }

    function a2b(a) {
    var b, c, d, e = {}, f = 0, g = 0, h = "", i = String.fromCharCode, j = a.length;
    for (b = 0; 64 > b; b++) e["ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/".charAt(b)] = b;
    for (c = 0; j > c; c++) for (b = e[a.charAt(c)], f = (f << 6) + b, g += 6; g >= 8; ) ((d = 255 & f >>> (g -= 8)) || j - 2 > c) && (h += i(d));
    return h;
    }

    /*
    var str1ng="http://www.whak.ca/packer/",
    encoded=b2a(str1ng),
    decoded=a2b(encoded);
    alert(encoded+"\n"+decoded);
    */