46 lines
1.3 KiB
JavaScript
46 lines
1.3 KiB
JavaScript
export function decode(base32) {
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for (
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var base32chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZ234567",
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bits = "",
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hex = "",
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i = 0;
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i < base32.length;
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i++
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) {
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var val = base32chars.indexOf(base32.charAt(i).toUpperCase());
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bits += leftpad(val.toString(2), 5, "0");
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}
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for (i = 0; i + 4 <= bits.length; i += 4) {
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var chunk = bits.substr(i, 4);
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hex += parseInt(chunk, 2).toString(16);
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}
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return hex;
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}
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function leftpad(str, len, pad) {
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return (
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len + 1 >= str.length &&
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(str = new Array(len + 1 - str.length).join(pad) + str),
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str
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);
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}
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export function base64decode(base64String) {
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var sliceSize = 1024;
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var byteCharacters = window.atob(base64String);
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var bytesLength = byteCharacters.length;
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var slicesCount = Math.ceil(bytesLength / sliceSize);
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var byteArrays = new Array(slicesCount);
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for (var sliceIndex = 0; sliceIndex < slicesCount; ++sliceIndex) {
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var begin = sliceIndex * sliceSize;
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var end = Math.min(begin + sliceSize, bytesLength);
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var bytes = new Array(end - begin);
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for (var offset = begin, i = 0; offset < end; ++i, ++offset) {
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bytes[i] = byteCharacters[offset].charCodeAt(0);
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}
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byteArrays[sliceIndex] = new Uint8Array(bytes);
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}
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return byteArrays
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} |