52 lines
1.1 KiB
JavaScript
52 lines
1.1 KiB
JavaScript
/** Functions from https://plantuml.com/code-javascript-synchronous
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*/
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function encode64(data) {
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r = "";
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for (i=0; i<data.length; i+=3) {
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if (i+2==data.length) {
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r +=append3bytes(data.charCodeAt(i), data.charCodeAt(i+1), 0);
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} else if (i+1==data.length) {
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r += append3bytes(data.charCodeAt(i), 0, 0);
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} else {
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r += append3bytes(data.charCodeAt(i), data.charCodeAt(i+1),
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data.charCodeAt(i+2));
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}
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}
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return r;
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}
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function append3bytes(b1, b2, b3) {
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c1 = b1 >> 2;
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c2 = ((b1 & 0x3) << 4) | (b2 >> 4);
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c3 = ((b2 & 0xF) << 2) | (b3 >> 6);
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c4 = b3 & 0x3F;
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r = "";
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r += encode6bit(c1 & 0x3F);
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r += encode6bit(c2 & 0x3F);
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r += encode6bit(c3 & 0x3F);
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r += encode6bit(c4 & 0x3F);
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return r;
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}
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function encode6bit(b) {
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if (b < 10) {
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return String.fromCharCode(48 + b);
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}
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b -= 10;
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if (b < 26) {
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return String.fromCharCode(65 + b);
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}
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b -= 26;
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if (b < 26) {
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return String.fromCharCode(97 + b);
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}
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b -= 26;
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if (b == 0) {
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return '-';
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}
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if (b == 1) {
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return '_';
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}
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return '?';
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} |