mirror of
https://github.com/piskelapp/piskel.git
synced 2023-08-10 21:12:52 +03:00
19 lines
616 B
JavaScript
19 lines
616 B
JavaScript
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function encode64(input) {
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var output = "", i = 0, l = input.length,
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key = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=",
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chr1, chr2, chr3, enc1, enc2, enc3, enc4;
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while (i < l) {
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chr1 = input.charCodeAt(i++);
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chr2 = input.charCodeAt(i++);
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chr3 = input.charCodeAt(i++);
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enc1 = chr1 >> 2;
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enc2 = ((chr1 & 3) << 4) | (chr2 >> 4);
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enc3 = ((chr2 & 15) << 2) | (chr3 >> 6);
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enc4 = chr3 & 63;
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if (isNaN(chr2)) enc3 = enc4 = 64;
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else if (isNaN(chr3)) enc4 = 64;
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output = output + key.charAt(enc1) + key.charAt(enc2) + key.charAt(enc3) + key.charAt(enc4);
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}
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return output;
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}
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