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27 lines
1001 B
27 lines
1001 B
'use strict';
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var globalThis = require('../internals/global-this');
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var uncurryThis = require('../internals/function-uncurry-this');
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var Uint8Array = globalThis.Uint8Array;
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var SyntaxError = globalThis.SyntaxError;
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var parseInt = globalThis.parseInt;
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var min = Math.min;
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var NOT_HEX = /[^\da-f]/i;
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var exec = uncurryThis(NOT_HEX.exec);
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var stringSlice = uncurryThis(''.slice);
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module.exports = function (string, into) {
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var stringLength = string.length;
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if (stringLength % 2 !== 0) throw new SyntaxError('String should be an even number of characters');
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var maxLength = into ? min(into.length, stringLength / 2) : stringLength / 2;
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var bytes = into || new Uint8Array(maxLength);
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var read = 0;
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var written = 0;
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while (written < maxLength) {
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var hexits = stringSlice(string, read, read += 2);
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if (exec(NOT_HEX, hexits)) throw new SyntaxError('String should only contain hex characters');
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bytes[written++] = parseInt(hexits, 16);
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}
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return { bytes: bytes, read: read };
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};
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