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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 | 2x 1x 1x 1x 1x 1x 1x 2x 2x 2x 1x 1x | /**
* 16进制字符串转ArrayBuffer
* @method util/hexToAb
* @see https://caniuse.com/#search=ArrayBuffer
* @param {String} str 需要转换的16进制字符串
* @returns {ArrayBuffer} 被转换后的 ArrayBuffer 对象
* @example
* var $hexToAb = require('@spore-ui/kit/packages/util/hexToAb');
* var ab = $hexToAb();
* ab.byteLength; // => 0
* ab = $hexToAb('abcd');
* var dv = new DataView(ab);
* ab.byteLength; // => 2
* dv.getUint8(0); // => 171
* dv.getUint8(1); // => 205
*/
function hexToAb(str) {
if (!str) {
return new ArrayBuffer(0);
}
var buffer = new ArrayBuffer(Math.ceil(str.length / 2));
var dataView = new DataView(buffer);
var index = 0;
var i;
var len = str.length;
for (i = 0; i < len; i += 2) {
var code = parseInt(str.substr(i, 2), 16);
dataView.setUint8(index, code);
index += 1;
}
return buffer;
}
module.exports = hexToAb;
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