ethers.js/lib.esm/wordlists/bit-reader.js

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JavaScript
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2022-09-05 23:57:11 +03:00
const Base64 = ")!@#$%^&*(ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz-_";
export function decodeBits(width, data) {
const maxValue = (1 << width) - 1;
const result = [];
let accum = 0, bits = 0, flood = 0;
for (let i = 0; i < data.length; i++) {
// Accumulate 6 bits of data
accum = ((accum << 6) | Base64.indexOf(data[i]));
bits += 6;
// While we have enough for a word...
while (bits >= width) {
// ...read the word
const value = (accum >> (bits - width));
accum &= (1 << (bits - width)) - 1;
bits -= width;
// A value of 0 indicates we exceeded maxValue, it
// floods over into the next value
if (value === 0) {
flood += maxValue;
}
else {
result.push(value + flood);
flood = 0;
}
}
}
return result;
}
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