46 lines
1.2 KiB
JavaScript
46 lines
1.2 KiB
JavaScript
// @flow
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export function toHex(str: string): string {
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const array = Array.from(str);
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let result = '';
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for (var i = 0; i < array.length; i++) {
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const val = array[i];
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const utf = toUTF8Array(val)
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.map((num) => num.toString(16))
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.join('');
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result += utf;
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}
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return result;
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}
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// https://gist.github.com/joni/3760795
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// See comment that fixes an issue in the original gist
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function toUTF8Array(str: string): Array<number> {
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var utf8 = [];
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for (var i = 0; i < str.length; i++) {
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var charcode = str.charCodeAt(i);
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if (charcode < 0x80) utf8.push(charcode);
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else if (charcode < 0x800) {
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utf8.push(0xc0 | (charcode >> 6), 0x80 | (charcode & 0x3f));
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} else if (charcode < 0xd800 || charcode >= 0xe000) {
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utf8.push(0xe0 | (charcode >> 12), 0x80 | ((charcode >> 6) & 0x3f), 0x80 | (charcode & 0x3f));
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}
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// surrogate pair
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else {
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i++;
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charcode = (((charcode & 0x3ff) << 10) | (str.charCodeAt(i) & 0x3ff)) + 0x010000;
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utf8.push(
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0xf0 | (charcode >> 18),
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0x80 | ((charcode >> 12) & 0x3f),
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0x80 | ((charcode >> 6) & 0x3f),
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0x80 | (charcode & 0x3f)
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);
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}
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}
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return utf8;
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}
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