ethers.js/packages/strings/lib.esm/bytes32.js

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"use strict";
import { HashZero } from "@ethersproject/constants";
import { arrayify, concat, hexlify } from "@ethersproject/bytes";
import { toUtf8Bytes, toUtf8String } from "./utf8";
export function formatBytes32String(text) {
// Get the bytes
let bytes = toUtf8Bytes(text);
// Check we have room for null-termination
if (bytes.length > 31) {
throw new Error("bytes32 string must be less than 32 bytes");
}
// Zero-pad (implicitly null-terminates)
return hexlify(concat([bytes, HashZero]).slice(0, 32));
}
export function parseBytes32String(bytes) {
let data = arrayify(bytes);
// Must be 32 bytes with a null-termination
if (data.length !== 32) {
throw new Error("invalid bytes32 - not 32 bytes long");
}
if (data[31] !== 0) {
throw new Error("invalid bytes32 string - no null terminator");
}
// Find the null termination
let length = 31;
while (data[length - 1] === 0) {
length--;
}
// Determine the string value
return toUtf8String(data.slice(0, length));
}