ethers.js/lib.esm/utils/rlp-encode.js
2022-09-15 22:58:45 -04:00

49 lines
1.4 KiB
JavaScript

//See: https://github.com/ethereum/wiki/wiki/RLP
import { getBytes } from "./data.js";
function arrayifyInteger(value) {
const result = [];
while (value) {
result.unshift(value & 0xff);
value >>= 8;
}
return result;
}
function _encode(object) {
if (Array.isArray(object)) {
let payload = [];
object.forEach(function (child) {
payload = payload.concat(_encode(child));
});
if (payload.length <= 55) {
payload.unshift(0xc0 + payload.length);
return payload;
}
const length = arrayifyInteger(payload.length);
length.unshift(0xf7 + length.length);
return length.concat(payload);
}
const data = Array.prototype.slice.call(getBytes(object, "object"));
if (data.length === 1 && data[0] <= 0x7f) {
return data;
}
else if (data.length <= 55) {
data.unshift(0x80 + data.length);
return data;
}
const length = arrayifyInteger(data.length);
length.unshift(0xb7 + length.length);
return length.concat(data);
}
const nibbles = "0123456789abcdef";
/**
* Encodes %%object%% as an RLP-encoded [[HexDataString]].
*/
export function encodeRlp(object) {
let result = "0x";
for (const v of _encode(object)) {
result += nibbles[v >> 4];
result += nibbles[v & 0xf];
}
return result;
}
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