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25 lines
747 B
JavaScript
25 lines
747 B
JavaScript
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/**
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* Convert array of 16 byte values to UUID string format of the form:
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* XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX
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*/
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var byteToHex = [];
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for (var i = 0; i < 256; ++i) {
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byteToHex[i] = (i + 0x100).toString(16).substr(1);
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}
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function bytesToUuid(buf, offset) {
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var i = offset || 0;
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var bth = byteToHex;
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// join used to fix memory issue caused by concatenation: https://bugs.chromium.org/p/v8/issues/detail?id=3175#c4
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return ([bth[buf[i++]], bth[buf[i++]],
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bth[buf[i++]], bth[buf[i++]], '-',
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bth[buf[i++]], bth[buf[i++]], '-',
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bth[buf[i++]], bth[buf[i++]], '-',
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bth[buf[i++]], bth[buf[i++]], '-',
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bth[buf[i++]], bth[buf[i++]],
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bth[buf[i++]], bth[buf[i++]],
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bth[buf[i++]], bth[buf[i++]]]).join('');
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}
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module.exports = bytesToUuid;
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